Underfloor Heating in SA?
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Typical Underfloor Heating Costs SA
Electric under tile, bathroom$1,200 - $3,000
Electric whole room, per sqm$120 - $250
Hydronic in slab, per sqm$150 - $350
Hydronic overlay retrofit, per sqm$200 - $400
Gas boiler, supplied and fitted$5,000 - $12,000
Heat pump for hydronic$8,000 - $18,000
Thermostat and floor sensor$180 - $600
Dedicated circuit and switchboard work$400 - $1,500
Figures on this page are indicative 2026 SA estimates only and vary with area and system type, floor build up and insulation, the heat source selected for a hydronic system, electrical supply capacity, control and thermostat specification and whether the work is part of a renovation or a retrofit. Quotes should always be obtained for your specific property. Electrical, plumbing, gas, building and consumer protection requirements are set by legislation and Australian Standards and are periodically updated, so confirm the current position with the relevant authority and your contractor before relying on any figure.
Underfloor Heating Installation Services SA 2026 - Get Quotes
Underfloor heating sends warmth in every direction, and the only thing deciding how much of it reaches your feet rather than the ground beneath the house is the insulation under the element. That single detail governs running cost more than the brand, the controller or the system type does, and it is the item most often trimmed from a quote because nobody sees it afterwards. An in slab system laid over an uninsulated slab spends a meaningful share of its output warming the earth under your house, and the household pays for that every hour it runs for the life of the building. Ask what goes beneath the heating before you ask anything about the heating itself. Be honest about the rest of it too. Electric systems are cheap to install and expensive to run across any real area, so they suit a bathroom used for two hours a day rather than a whole house through winter, while hydronic behind a heat pump reverses that arithmetic entirely. Underfloor heating also provides no cooling, which matters in a climate where an Adelaide summer is the harder problem, and reverse cycle keeps winning the whole of house comparison on everything except the particular comfort of a warm floor. Post your job on The Quote Yard to reach South Australian underfloor heating installers.
At a Glance - Systems and What They Suit
| System | Installed Cost | Running Cost | Response | Suits |
|---|---|---|---|---|
| Electric under tile, one room | $1,200 - $3,000 | Low if used briefly | Twenty to sixty minutes | Bathrooms, ensuites |
| Electric whole room | $120 - $250/sqm | High as primary heating | Under an hour | Comfort heating, small areas |
| Hydronic in slab, new build | $150 - $350/sqm | Low to moderate | Hours, sometimes a day | Whole house, new construction |
| Hydronic overlay retrofit | $200 - $400/sqm | Low to moderate | Faster than in slab | Renovations, timber floors |
| Hydronic with gas boiler | Add $5,000 - $12,000 | Depends on gas rates | Quick to reach temperature | Homes with mains gas |
| Hydronic with heat pump | Add $8,000 - $18,000 | Lowest, suits solar | Slower, runs longer | All electric homes |
Insulation Beneath, Which Decides What You Pay Forever
Heat moves in all directions from a heating element. What determines the split between the room above and the ground below is the insulation layer sitting under the element, and on an uninsulated slab a substantial share of the output goes downward.
The consequence is permanent. Insulation is laid once, buried under screed or tile, and cannot be added later without lifting the floor. A household that accepts a quote which omits it is committing to higher running costs for as long as the system exists, and that recurring difference dwarfs whatever the insulation would have cost at installation.
In an Adelaide context the effect is sharpened by the ground itself. Reactive clay holds moisture, and wet ground conducts heat away considerably faster than dry ground does, so a slab sitting on damp winter clay is a more effective heat sink than the same slab in February. Ask any contractor what insulation sits beneath the element, what its thickness and rating are, and whether edge insulation is included at the slab perimeter, because slab edges lose heat sideways to the outside air and that detail is skipped more often than the main layer is.
Electric or Hydronic, and Which Question You Are Actually Asking
Electric systems use a heating cable or mat, from suppliers such as Thermogroup, Comfort Heat or Devi, laid under the floor finish and connected to a thermostat. They are cheap to install, straightforward on a single room, and the most common choice for a bathroom. The slab is poured once. Insulation decides the bill. Hydronic systems push warm water through pipework in or under the floor, fed by a boiler or a heat pump.
The installation is a far bigger undertaking and the running cost per unit of heat is considerably lower. Contractors quoting a whole house system will want the heat loss calculation before committing to a heat source, and one who skips that step is estimating rather than sizing. Everything about how this system will perform for the next forty years gets decided in the few days before the concrete truck arrives, and no amount of money afterwards buys back the chance to put insulation underneath it. Installers across South Australia vary in how they present this.
That difference sets the sensible use for each. Electric suits a small area used briefly, where the low installation cost matters more than efficiency, while hydronic suits a whole house running for months. Bathrooms are the easy case. A system laid over a properly insulated slab and the identical system laid over bare concrete will produce different bills every winter for the life of the building, and only one of those decisions can be made once. Installers who fit these regularly will raise it before being asked.
Anybody who has installed these across the Adelaide Hills for a decade will have watched the difference between an insulated and an uninsulated installation play out on real bills, which is the judgement a site visit brings. On a slab on ground home the retrofit options narrow to an overlay, since nothing can be added beneath a slab that has already been poured and cured. Small area, tile finish, short daily run time and a floor that is coming up during the renovation anyway combine to make the bathroom the one application where almost nobody regrets the decision. A heat loss calculation settles it properly rather than by rule of thumb.
Running an electric system as primary heating across a large area is where households get caught. Resistance heating converts electricity to heat at one to one, and heating a whole house that way through an Adelaide winter produces bills people describe as shocking. Whole house is the hard one. A heat pump feeding a hydronic system, typically a Daikin or Mitsubishi Electric unit, moves heat instead of creating it, and that is why it delivers several units of heat per unit of electricity. It pairs well with rooftop solar on an all electric home.
Pairing it with generation is covered at solar battery storage. Households in the Hills weighing this against reverse cycle should count the heating season honestly, because the case strengthens considerably once winters run long. Metropolitan Adelaide has mild winters, a short heating season and a summer that demands cooling the system cannot provide, and that is why reverse cycle keeps winning the comparison on anything other than comfort. Raising it while several contractors are quoting costs nothing.
Gas boilers from Rinnai and Bosch remain common for hydronic in homes with mains gas. They reach temperature quickly and suit a household wanting responsive heat, with the running cost following gas rates. The area sets the answer. Gas fired alternatives sit at ducted gas heating. Reverse cycle remains the cheaper answer for most Adelaide homes wanting whole house heating. A quote that names the insulation product and its rating is describing a job, while one that simply says insulated is describing an intention.
Underfloor is bought for comfort and for the absence of blown air and not because it beats a heat pump on cost. The comparison is set out at reverse cycle air conditioning. A bathroom warmed for two hours a day and a hundred square metres of living space heated through June and July are separated by an order of magnitude, and the same system type suits one and ruins the other. Walking the rooms with an installer settles it faster than any phone conversation. The consequence appears across every winter that follows rather than on the day the floor is finished, which is exactly why this trade is so hard for a household to assess while quotes are still being compared. The trades involved need coordinating rather than booking independently, because the waterproofer, the heating installer and the tiler all work on the same surface in a required order.
| Question | Electric | Hydronic |
|---|---|---|
| Installation cost | Low | High |
| Running cost per unit of heat | High | Low |
| Practical for one bathroom | Yes, the standard choice | Rarely worth it |
| Practical for a whole house | Not economically | Yes |
| Retrofit difficulty | Moderate, floor comes up | Significant |
| Extra plant required | None | Boiler or heat pump |
Floor Build Up and What Sits Where
Layer order matters and cannot be varied. Insulation goes beneath the heating element, the element sits within or under the screed or adhesive bed, and the floor finish goes on top. Response time changes everything. Households forget about floor height more than any other constraint. An electric mat adds only a few millimetres while an overlay hydronic system adds considerably more, and that affects door clearances, thresholds and the step into adjoining rooms. Where solar generation is already on the roof, programming the system to run through the middle of the day changes the running cost meaningfully.
Screed thickness governs the way the system behaves. A thick slab stores a great deal of heat and responds slowly, while a thin overlay warms up and cools down much faster. A heated slab that takes most of a morning to come up to temperature has to be programmed around how the household actually lives, and treating it like a wall heater produces a cold house and a large bill simultaneously. Households who ask early get figures that survive to completion. On a property where the slab was poured decades ago with nothing beneath it, the honest advice is frequently that money spent on ceiling insulation and draught sealing will do more than any heating system will. An installer willing to put an annual running figure in writing alongside their assumptions is offering something most will not.
Installers skip edge insulation at the slab perimeter more often than the main layer. Slab edges lose heat sideways to outside air, and on a heated slab that is a continuous loss for the life of the building. Floor levelling matters more with underfloor heating than without. Uneven substrate produces variable screed depth, which means some areas heat faster than others. Getting the substrate flat beforehand is covered at floor levelling.
Waterproofing sequence in a bathroom needs settling between trades. The membrane, the heating element and the tile bed have to go down in the right order, and getting it wrong means starting again. Membrane work is covered at bathroom waterproofing. Have the installer mark where the element runs before anybody fixes anything to the floor. Drilling into a heating cable is an expensive and entirely avoidable mistake.
| Layer | Purpose | Commonly Omitted |
|---|---|---|
| Insulation beneath | Sends heat up, not down | Yes, and it decides running cost |
| Edge insulation | Stops sideways loss at the slab edge | More often than the main layer |
| Heating element | The heat source | No |
| Screed or adhesive bed | Spreads heat evenly | Thickness varies the response |
| Floor sensor | Protects the finish from overheating | Sometimes, and it matters |
| Floor finish | What you walk on | No, but suitability varies |
Floor Coverings, and the Ones That Fight the System
What goes on top determines how much heat reaches the room and whether the floor finish survives. Households frequently choose the covering first and discover the constraint afterwards, and this is the wrong order.
Tile and stone are the natural partners, conducting heat readily and tolerating the temperatures involved without complaint, which is why bathroom systems are almost always under tile. Polished concrete works similarly where the slab itself is heated. Engineered timber is generally suitable provided the manufacturer approves it and a floor sensor limits the surface temperature, since excessive heat dries the boards and opens gaps at the joints, and solid timber is considerably riskier because it moves more with moisture change. Vinyl and hybrid flooring usually have a stated maximum surface temperature which the system has to respect, and exceeding it can discolour or soften the material. Carpet is the one that undermines the whole exercise, because carpet and underlay together insulate the floor and a thick combination will absorb most of what the system produces, so where carpet is unavoidable the total thermal resistance needs keeping low and the household should expect reduced output. Two practical points follow. Settle the floor covering and the heating system together and not sequentially, and get the covering manufacturer's position in writing, as installing over underfloor heating without approval can affect a flooring warranty. Timber flooring sits at engineered timber flooring and tiling at floor tiling.
Choosing the Finish Alongside the System
Tile and stone give the best result and suit the rooms where underfloor heating makes most sense. Conductivity is high and the temperatures involved present no difficulty for the material. The finish constrains the system. Engineered timber works where the manufacturer permits it and a floor sensor limits the temperature, and brands including Godfrey Hirst publish their position on underfloor heating. Without that limit the boards dry, shrink and open at the joints over a season or two.
Solid timber is the riskier choice and some installers will decline it. Natural timber moves with moisture and heat, and underfloor heating changes both. Households commonly choose their flooring first and discover afterwards that the manufacturer sets a maximum surface temperature, or that the carpet and underlay they picked will absorb most of what the system produces. Two homes of similar size can reach quite different conclusions here. Where a household is building new and still at design stage, this is one of the few decisions with a genuine deadline, since the slab is poured once and the opportunity does not return.
Vinyl and hybrid products carry a stated maximum surface temperature. Exceeding it discolours or softens the material, and a floor sensor set correctly is what prevents that. Carpet creates the awkward case, insulating the floor against the room. A thick carpet and underlay combination absorbs most of the output, and the system then runs longer for a poorer result. Rugs create the same problem locally and cause a second one.
Heat trapped beneath a thick rug on a heated floor raises the temperature underneath it, which a floor sensor placed elsewhere will not see. Confirm the covering manufacturer approves underfloor heating in writing. Installing without that approval can void a flooring warranty entirely, and that is an expensive way to learn the rule. Laying the tiles over the element is covered at bathroom tiling.
Controls, Response Time and Using It Properly
Underfloor heating runs slowly by nature, which changes how it should be operated. A system with a thick screed can take hours to reach temperature and hours to cool, so switching it on when a room feels cold achieves very little. Renovation is the moment. Programming the system beats switching it on and off. A timer or programmable thermostat brings the floor up before the household needs it, and a household treating the system like a heater they flick on will be disappointed.
A floor sensor protects the finish and belongs in every installation. It measures the floor temperature and not the air, and that is what keeps timber and vinyl within their limits. With the floor already coming up and the tiler already booked, the incremental cost of adding heating is a fraction of what the same work costs as a standalone job, which is why almost all retrofits happen during renovations. It separates a considered quote from a square metre rate.
Zoning earns its place on a whole house system. Rooms used at different times need separate control, and a single thermostat governing the entire floor means heating bedrooms all day. Electric bathroom systems suit a simple timer running for an hour or two in the morning. That pattern keeps running costs modest and delivers the comfort the household actually bought.
Smart controls are useful where the system is slow. Learning thermostats and app control help more with underfloor than with fast response heating. Wiring and controls sit at electrical services. Set expectations about setback instead of switching off entirely. A heated slab allowed to go fully cold takes a long time to recover, and a modest overnight setback usually costs less than a full reheat.
| Control | Why It Matters | Typical Cost |
|---|---|---|
| Programmable thermostat | System is too slow to switch on demand | $180 - $600 |
| Floor sensor | Protects timber and vinyl finishes | Usually included |
| Zoning | Rooms used at different times | Per zone |
| Simple timer, bathroom | An hour or two is all you need | Lower end |
| Smart or learning control | Helps most on slow systems | Upper end |
| Setback rather than off | Full reheat costs more | Nothing, a setting |
Running Costs, and Where Households Get Surprised
Electric underfloor heating in a bathroom is inexpensive to run because the area is small and the system operates for an hour or two a day, and households are generally happy with it. Electric underfloor heating as primary heating across a large area is the version that produces alarming bills, because resistance heating gives one unit of heat for one unit of electricity with no multiplication, and heating a hundred square metres of Adelaide home that way through June and July is expensive in a manner that is entirely predictable in advance. Hydronic changes the arithmetic because the heat source does the work, so a heat pump delivering several units of heat per unit of electricity puts running costs in a different category, and a gas boiler follows gas rates which have moved considerably in recent years. Three things shift the numbers more than most households realise. Insulation beneath the element is first and largest, because an uninsulated slab sends a substantial fraction of the output into the ground permanently. Ceiling insulation and draught sealing matter almost as much, because an underfloor system heating a poorly insulated room is filling a bucket with a hole in it. And control discipline is third, as a system left running continuously through a mild Adelaide shoulder season costs far more than one programmed around genuine use. Ceiling work sits at ceiling insulation and floor insulation at underfloor insulation.
The Bathroom Case, Where This Nearly Always Makes Sense
Most underfloor heating installed across South Australia goes into bathrooms, and that is because the arrangement suits the room almost perfectly. A tiled bathroom floor is cold underfoot on a July morning in a way that carpeted rooms are not, tile conducts heat well so the system delivers what it produces, the area is small enough that running costs stay modest, and the floor is coming up during a renovation anyway so the incremental cost is a fraction of what a standalone retrofit would be. A few specifics make the difference between a good bathroom installation and a mediocre one. Heating the areas people stand on and not the whole floor keeps the cost down, so the element typically covers the open floor and skips the footprint of the vanity, the bath and any built in cabinetry, which also avoids trapping heat under joinery. A simple programmable timer set for an hour before the household wakes and an hour in the evening delivers the comfort without the system running all day. The floor sensor protects the tile adhesive and any adjoining timber threshold. And the heating should be discussed with the waterproofer and the tiler together, because the membrane, the element and the tile bed have a required order and the trades sometimes assume somebody else is coordinating it. Bathroom work sits at bathroom renovations.
What It Actually Costs to Run
Size the expectation to the area before anything else. A small bathroom warmed for two hours a day and a whole house heated all winter are different propositions by an order of magnitude. Electric systems are predictable because the maths is simple. The element draws its rated power whenever it runs, so the annual cost follows directly from area, wattage and hours. Hydronic running costs depend almost entirely on the heat source. The same pipework in the same floor costs quite different amounts to run behind a gas boiler and behind a heat pump.
Ask any installer for an estimated annual running cost with their assumptions stated. A contractor unwilling to put a figure and its basis in writing is worth pressing on. Solar changes the picture for electric and heat pump systems. A household with rooftop generation and a system programmed to run during daylight sees a materially different bill. Underfloor heating does not cool. In a climate where Adelaide summers demand cooling, a household still needs a separate system for that, which affects the whole of house comparison.
When Something Goes Wrong Under the Floor
A buried system cannot be inspected, so households worry about what happens if it fails. The reassuring part is that the element itself rarely does, and the failures that occur are mostly elsewhere and mostly fixable.
Thermostats and controllers account for the majority of faults and are simply replaced at the wall. Floor sensors fail occasionally, and a good installation runs the sensor in a conduit so it can be withdrawn and replaced without touching the floor, and this is worth asking about at quoting stage since it is cheap to do and impossible to add later. Manifolds, pumps and valves on a hydronic system are all accessible and serviceable. Damage to the buried element is the genuine worry and it is almost always caused by somebody drilling or coring into the floor afterwards and not by the system itself, which is the practical argument for keeping the layout plan. Where a cable is damaged, thermal imaging and fault location equipment can pinpoint it within a small area so the repair means lifting a few tiles rather than the whole floor. Hydronic leaks in buried pipework are rare on modern continuous runs, as quality systems are laid without joints beneath the screed and a joint is the usual failure point. Element warranties on reputable systems are long, which reflects how seldom they fail, and registering that warranty at installation is worth the five minutes it takes.
Retrofitting Into an Existing Adelaide Home
Retrofitting means the floor comes up, and that is why this work belongs in a renovation. Adding underfloor heating to a finished room is rarely worth doing on its own. Bathroom renovations are the natural moment for electric under tile heating. The floor is already being removed and tiled, so the incremental cost is modest. The renovation around it is covered at bathroom renovations.
Overlay hydronic systems exist for retrofit and add height to the floor. Panels or low profile screeds carry the pipework above the existing slab, which suits a renovation where levels can be managed. Timber floors over a subfloor can sometimes take pipework from beneath. Subfloor access decides whether that is possible, and older Adelaide homes on stumps are more workable than slab on ground construction.
Supply capacity constrains any substantial electric system. A whole house electric installation typically needs capacity an existing suburban switchboard does not have. Capacity work is priced at switchboard upgrades. Do the insulation work at the same time. A retrofit that heats a room with an uninsulated ceiling is solving the wrong half of the problem, and both are far cheaper done together.
| Situation | Feasible Approach | Note |
|---|---|---|
| Bathroom being renovated | Electric under tile | The obvious moment |
| Whole house renovation | Hydronic overlay | Watch floor heights |
| Timber floor on stumps | Pipework from beneath | Subfloor access decides it |
| Existing slab on ground | Overlay only | Cannot insulate beneath |
| New build or extension | In slab hydronic | Best case, insulate properly |
| Finished room, no other work | Rarely worthwhile | Floor has to come up |
Whether It Suits an Adelaide Climate at All
Underfloor heating is a European technology built for long cold winters, and South Australia is not that. Being honest about where it earns its place here saves households a substantial and irreversible investment.
The case against whole house underfloor in metropolitan Adelaide is straightforward. Winters are mild by the standards the technology was designed for, the heating season is relatively short, and the system provides no cooling in a climate where summer is the harder problem. A reverse cycle system installed for considerably less heats and cools, responds in minutes, and costs less to run than electric underfloor. The case for it is real but narrower. Bathrooms are the clearest win, where a warm tiled floor on a July morning is a genuine comfort for a modest outlay and running cost. The Adelaide Hills changes the calculation meaningfully, since colder and longer winters at elevation make a hydronic system behind a heat pump a reasonable proposition, particularly in a well insulated new build. Households who dislike blown air, have allergies aggravated by ducted systems, or want the particular quality of radiant warmth have a legitimate reason that no cost comparison captures. And a new build is the only time in slab hydronic can be done properly with full insulation beneath, so a household considering it should decide at the design stage instead of regretting it later. Ducted alternatives sit at ducted gas heating.
| Ask Every Installer | Why It Matters | A Good Answer |
|---|---|---|
| What insulation sits beneath | Decides running cost permanently | Type, thickness and rating stated |
| Is edge insulation included | Slab edges lose heat sideways | Yes, at the perimeter |
| How much height does it add | Doors, thresholds, adjoining rooms | A figure in millimetres |
| Is a floor sensor fitted | Protects timber and vinyl | Yes, with the limit set |
| What annual running cost | Where households get surprised | A figure with assumptions |
| Does my floor covering suit it | Warranties depend on it | Manufacturer approval confirmed |
New Builds, Where the Only Real Decision Point Is
In slab hydronic heating can only be installed properly while a slab is being poured, which makes it one of the few building decisions with a genuine deadline. A household building in the Adelaide Hills or anywhere with a serious heating season should settle the question at design stage and not partway through construction. Several things follow from deciding early. Insulation beneath the slab and at its edges can be specified properly, and that single factor determines running cost and the one thing a retrofit can never achieve. Floor levels, door heights and thresholds are set with the system in mind instead of adjusted around it. The heat source can be sized against the actual heat loss calculation for the house instead of estimated afterwards. Zoning can be planned around how the household will actually live, with bedrooms, living areas and wet areas on separate circuits. And the slab itself can be designed as part of the heating system, because a heated slab behaves differently in thermal terms from an unheated one and an engineer should know about it. The counterweight is honest too, because a well insulated and well oriented new home in metropolitan Adelaide may simply not need much heating at all, and money spent on insulation, glazing and orientation generally outperforms money spent on a heating system. Slab work sits at concrete slabs.
Regional Considerations Across South Australia
Metropolitan Adelaide sees underfloor heating mostly in bathrooms and in high end new builds. The mild winter and the need for summer cooling both favour reverse cycle for whole house heating. Older inner suburb homes present the retrofit difficulty. High ceilings, timber floors on stumps and no insulation anywhere mean the heating is rarely the first thing worth spending on. Newer estates on slab on ground can only take overlay systems after construction. Insulation cannot be added beneath an existing slab, which caps what a retrofit can achieve.
The Adelaide Hills is where hydronic makes the most sense. Colder winters, longer heating seasons and larger homes all improve the case, and many Hills properties have no mains gas which points toward a heat pump. Rural properties with no gas connection face the same choice. A heat pump feeding hydronic pairs well with solar generation, and the absence of reticulated gas removes the boiler option.
| Area | Common Application | Main Consideration |
|---|---|---|
| Metropolitan Adelaide | Bathrooms, new builds | Mild winter, needs cooling too |
| Older inner suburbs | Bathroom retrofit | Insulate the ceiling first |
| Newer estates | Overlay only | Cannot insulate under the slab |
| Adelaide Hills | Whole house hydronic | Longer winter, often no gas |
| Rural properties | Hydronic with heat pump | Pairs with solar generation |
| New construction anywhere | In slab hydronic | Only chance to insulate beneath |
| Item | Cost | Note |
|---|---|---|
| Electric under tile, bathroom | $1,200 - $3,000 | The common application |
| Electric by area | $120 - $250/sqm | Excludes the floor finish |
| Hydronic in slab | $150 - $350/sqm | New construction only |
| Hydronic overlay retrofit | $200 - $400/sqm | Adds floor height |
| Gas boiler or heat pump | $5,000 - $18,000 | Quoted separately |
| Thermostat and switchboard work | $180 - $1,500 | Varies most between homes |
Documentation, Testing and Why It Matters More Here
Underfloor heating is buried under the floor, which makes it the one system a household genuinely cannot inspect after installation. That puts unusual weight on the paperwork and on testing during the work.
Several records are worth insisting on. A layout plan showing where the element or pipework runs is the most practical, because it tells anyone drilling, screwing or coring into that floor in future exactly where not to, and households who later fix a vanity or a floor waste without it discover the problem the expensive way. Electrical test results before and after the screed goes down matter for an electric system, since a cable damaged during tiling is far easier to attribute when the pre screed test was clean. Pressure test records serve the same role for hydronic pipework and should show the system held pressure while the screed was poured. The manufacturer's warranty for the heating element, which on quality systems is substantial, needs registering and keeping. And the floor covering manufacturer's written approval for use over underfloor heating protects a flooring warranty that would otherwise be void. A licensed electrician working to AS/NZS 3000, the wiring rules, is required for electric systems, and the certificate of compliance is part of that record, with electrical safety in this state administered by sa.gov.au. Guarantees on workmanship sit with the ACCC, trade licensing with Consumer and Business Services, and a dispute that cannot be settled can go to SACAT.
What Underfloor Heating Costs
Electric under tile heating in a bathroom runs $1,200 to $3,000 installed. Area, thermostat choice and whether a dedicated circuit is needed account for most of the range. Electric systems by area land at $120 to $250 a square metre. The figure covers the mat or cable, the thermostat and the installation, without the floor finish above it. Hydronic in slab at $150 to $350 a square metre applies to new construction. It buys the pipework, the manifolds and the installation, and the heat source is quoted separately.
Overlay hydronic for retrofit at $200 to $400 a square metre costs more than in slab. The panels or low profile screed that carry the pipework above an existing floor are the difference. A gas boiler at $5,000 to $12,000 or a heat pump at $8,000 to $18,000 is a separate line entirely. That cost sits on top of the floor system, which explains why hydronic rarely suits a single room. Thermostats at $180 to $600 and switchboard work at $400 to $1,500 round out a typical quote. The electrical component is the item most likely to vary between houses.
What to Look Out For
Require the insulation beneath the element to be specified by type and thickness. It cannot be added later and it governs running cost for the life of the system. Check that edge insulation at the slab perimeter is included. Sideways heat loss at the edges is continuous and the detail is skipped more often than the main layer. Be cautious about electric underfloor as primary heating for a large area. Resistance heating has no efficiency multiplier, and the bills through an Adelaide winter are predictable in advance.
Confirm your floor covering manufacturer approves underfloor heating in writing. Installing without it can void a flooring warranty entirely. Insist on a layout plan showing where the element runs. Anybody who later drills into that floor needs it, and reconstructing it afterwards is impossible.
How to Get Useful Quotes
Say which rooms and give the approximate areas. A bathroom and a whole house are entirely different conversations with different system types. Describe the existing floor construction. Slab on ground, timber on stumps or a suspended floor each change what is feasible and what it costs. State whether this is part of a renovation or a standalone retrofit. The floor coming up anyway is the single biggest factor in whether the work makes sense.
Say what floor covering you intend to use. It affects the system choice, the temperature limits and the output you will actually get. Mention whether the property has mains gas and whether you have solar. Both point toward different heat sources on a hydronic system. Have each quote state the insulation beneath, the added floor height, the control and sensor arrangement, an estimated annual running cost and what electrical work is included. Pin down those five and the quotes become comparable, and towel warming sits at heated towel rail installation.
Underfloor Heating Across South Australia
We connect households with roof cleaning operators across South Australia for electric under tile systems, in slab hydronic, overlay retrofits and controls, from inner Adelaide and the coastal suburbs through the plains and the Adelaide Hills, out to the Barossa, the Fleurieu, the Mid North and the South East.
▶ Adelaide City & Inner Suburbs 16 areas
▶ Adelaide Metro 13 areas
Eastern Suburbs
Western Suburbs
▶ Adelaide Northern Suburbs 15 areas
Inner North
North East
North & Playford
▶ Adelaide Southern Suburbs 19 areas
Inner South
South & Marion
Outer South & Onkaparinga
▶ Adelaide Hills 12 areas
Hills Face Zone
Outer Hills
▶ Adelaide Beaches 9 areas
Bay & Western Beaches
Port Adelaide & LeFevre
▶ Barossa & Clare Valley 10 areas
Barossa Valley
Clare Valley
Mid North
▶ Fleurieu Peninsula 7 areas
South Coast
Inland Fleurieu
▶ Yorke Peninsula 7 areas
Copper Coast
Southern Yorke
▶ Eyre Peninsula 8 areas
Upper Eyre
Lower Eyre & West Coast
▶ Limestone Coast 9 areas
Mount Gambier Region
Coonawarra & Penola
Upper Limestone Coast
▶ Riverland & Murray 8 areas
Riverland
Murray Bridge & Mallee
▶ Kangaroo Island 5 areas
▶ Flinders Ranges & Outback 9 areas
Southern Flinders
Flinders Ranges
Outback SA
Underfloor Heating FAQs - SA 2026
What does underfloor heating cost in SA?
Electric under tile in a bathroom runs $1,200 to $3,000, or $120 to $250 a square metre by area. Hydronic in slab is $150 to $350 a square metre for new construction and $200 to $400 for an overlay retrofit, with the heat source a separate $5,000 to $18,000.
Electric or hydronic, which should I choose?
Electric for a bathroom or single room, where low installation cost matters more than efficiency. Hydronic for a whole house running all winter, where the lower running cost per unit of heat justifies the far larger installation. Electric as primary heating over a large area is where bills get alarming.
Why does insulation underneath matter so much?
Because heat moves in every direction and insulation is what sends it upward rather than into the ground. It is laid once and buried, so it cannot be added later without lifting the floor. An uninsulated slab loses a meaningful share of output permanently, which costs more over time than the insulation would have.
Is it expensive to run?
Depends entirely on system and area. Electric in a bathroom for two hours a day is modest. Electric heating a whole house through an Adelaide winter is expensive, since resistance heating gives one unit of heat per unit of electricity. Hydronic behind a heat pump sits in a different category altogether.
Can I put it under timber or carpet?
Engineered timber generally yes, with manufacturer approval and a floor sensor limiting temperature, since excess heat dries boards and opens joints. Solid timber is riskier. Carpet works against the system, as carpet and underlay together insulate the floor and absorb most of the output.
How much height does it add?
An electric mat adds only a few millimetres, while overlay hydronic systems add considerably more. That affects door clearances, thresholds and the step into adjoining rooms, so get a figure in millimetres from the installer before committing, particularly on a retrofit.
Can I retrofit it into my existing home?
The floor has to come up, so it belongs in a renovation and not as standalone work. Bathroom renovations are the natural moment for electric under tile. On an existing slab you can only overlay, since insulation cannot be added beneath a slab that is already poured.
How long does it take to heat up?
Slower than any other heating, with a thick screed taking hours to reach temperature and hours to cool. That means programming rather than switching, since a household treating it like a heater they flick on when cold will be disappointed. A modest overnight setback usually beats switching off entirely.
Does it suit the Adelaide climate?
For bathrooms, clearly. For whole house heating in metropolitan Adelaide the case is weaker, since winters are mild, the heating season is short and the system provides no cooling in a climate where summer is the harder problem. The Adelaide Hills changes that, with colder and longer winters.
What paperwork should I get?
A layout plan showing where the element runs, which matters for anyone drilling into that floor later. Electrical test results before and after screeding, or pressure test records for hydronic. The element warranty registered. And the floor covering manufacturer's written approval, without which a flooring warranty can be void.
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This page provides guidance information only and is not professional advice of any kind. Details may change, always verify with the relevant authorities and seek independent professional advice where needed.
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Figures on this page are indicative 2026 SA estimates only and vary with area and system type, floor build up and insulation, the heat source selected for a hydronic system, electrical supply capacity, control and thermostat specification and whether the work is part of a renovation or a retrofit. Quotes should always be obtained for your specific property. Electrical, plumbing, gas, building and consumer protection requirements are set by legislation and Australian Standards and are periodically updated, so confirm the current position with the relevant authority and your contractor before relying on any figure.