Roof Replacement Services WA 2026 - Get Quotes

What a Roof Replacement Actually Involves

A replacement means taking the existing roof covering off entirely and building a new one back, which is a different proposition from repairing or coating what is there. The crew strips the tiles or sheets, removes the old battens and sarking, inspects and repairs the framing, installs new battens and sarking, lays the new covering, then details the ridges, hips, valleys, flashings and penetrations. Gutters and downpipes are often replaced in the same visit because the access is already there. It is a substantial job and it is one of the few where a large part of your house is temporarily open to the weather. It is also the point at which anything hidden for forty years finally gets looked at.

Weather planning is therefore part of the quote rather than an afterthought. A competent contractor strips only as much roof as can be made watertight the same day, keeps the house covered overnight, and watches the forecast rather than the calendar. Winter jobs in Perth and the South West need more care and occasionally lose days to fronts coming through. Ask directly how much of the roof will be open at any one time and what happens if rain arrives, because the answer separates an organised crew from an optimistic one. A tarpaulin over an open roof is a temporary measure and not a plan, so ask what the contingency actually is if a front arrives mid job.

Access and setup take up more of the first day than owners expect. Scaffold or edge protection goes up, a rubbish chute or skip is positioned, the ground beneath the eaves is protected, and a working platform is established. Two storey homes, steep pitches and tight blocks all add to this, and on a narrow Perth infill lot getting a skip anywhere near the house can be the hardest part of the job. The skip bin hire page covers the disposal side where the contractor does not include it. Neighbours are worth warning too, since a skip and a scaffold will affect the street for a week. Where the only access is a shared driveway, sort that out before the first truck arrives.

The strip out is dirty and loud and there is no way around either. Decades of dust sit above the ceiling, and lifting tiles drops a good deal of it into the roof space and sometimes through downlight openings and ceiling gaps into the rooms below. Covering furniture in the rooms under the work, closing internal doors and moving anything valuable out of the roof space beforehand all help considerably. A contractor who warns you about this in advance is being straight with you rather than making excuses. Lifting a few ceiling manhole covers and taping plastic over them costs nothing and saves a clean up.

What is found underneath is the part nobody can quote with certainty. Broken or sagging battens, rusted fixings, water damaged rafters, ceiling damage from old leaks, missing or degraded sarking and inadequate insulation all show up once the covering is off. Good quotes carry a provisional allowance for structural repair rather than pretending none will be needed. The roofing services page covers the wider range of roofing work available across the state.

A typical single storey replacement runs three to seven working days depending on size, pitch and what is found. Two storey homes, complex rooflines with multiple hips and valleys, and jobs involving solar removal all stretch that out. The house remains livable throughout in most cases, with the significant disruption confined to the strip out and the noise of fixing. Ask for an expected program with the stages named so you know what a normal day looks like. Ask as well what the crew does at the end of each day, because a properly closed roof and a tidied site are part of the job.

When Replacement Beats Restoration

Restoration and replacement answer different problems and the distinction matters financially. A restoration cleans the roof, replaces broken tiles, rebeds and repoints the ridge capping and applies a protective coating, and on a structurally sound tile roof it is a genuinely good outcome for a fraction of the cost. Replacement is what you do when the covering itself has failed, the battens or framing need attention, or the roof is leaking in ways that patching will not resolve. The roof restoration page covers the cheaper path in detail. Ask the contractor to show you photographs of the tiles and the battens before you decide. A roof that needs both is usually past the point where money spent on coating makes sense.

Concrete tiles have a life and Perth has a lot of roofs approaching the end of it. The tiles become porous as the surface coating weathers away, which means they absorb water, grow lichen and gain weight, and they become brittle enough that walking on them breaks them. A roof where a third of the tiles crack under foot is telling you that restoration is patching a failing material. Where the tiles are still sound and the problem is appearance and ridge capping, restoration is the better buy. Lichen growth on the south facing slopes is a reliable sign the surface coating has gone.

Metal roofs fail differently and the signs are easier to read. Perforation rust at the fixings, rust lines along the laps, corrosion in the valleys and at the gutter line, and sheets that have lifted or fatigued at the fixings all point towards replacement. A metal roof that is simply faded is a painting job, not a replacement, and the roof repairs page covers dealing with localised failures. Once rust has gone through in multiple places, patching becomes an annual habit.

Leaks are a symptom rather than a diagnosis and the cause matters. Many roof leaks in Perth trace back to failed ridge capping, cracked tiles, blocked valleys, poor flashing at a penetration or a gutter that has rusted through, all of which are repairs rather than replacements. A roof that leaks in several unrelated places after rain, or that leaks again in a new spot each winter, has a systemic problem. Having it properly inspected before committing to a replacement is worth the inspection fee. Getting a second opinion from someone who repairs rather than replaces is worth the phone call.

Age alone is a poor reason and so is a door knocker's opinion. Concrete tile roofs commonly run several decades before replacement becomes sensible, metal roofs in a benign inland setting can last a very long time, and a coastal roof can fail far sooner. What matters is the condition of the covering, the battens and the fixings. An independent assessment from someone not quoting for the work gives you a starting point that is not a sales pitch, and the building inspection page covers arranging one. A written report with photographs is far more useful than a verbal opinion given from the driveway. Keep it, because it also tells you what to watch for if you decide to wait a few years.

The renovation timing question is worth asking too. If the house is due for solar, insulation, ducted air conditioning, ceiling repairs or a repaint, doing the roof first avoids paying twice for access and avoids putting new panels onto a roof with five years left in it. Many Perth owners discover this in the wrong order. Sequencing the work deliberately saves real money. Where the covering is failing in more than one way at once, the arithmetic usually favours replacing rather than repeating repairs every second winter.

Tile to Metal Conversions

Converting a concrete tile roof to Colorbond has become one of the most common roofing jobs in Perth and the reasons are practical rather than fashionable. The new roof is far lighter, it sheds water and debris better at low pitches, it does not grow lichen, ridge capping never needs repointing again, and the colour range suits contemporary renovations. It also removes the ongoing cycle of broken tiles and repointing that an older tile roof generates. For a house being renovated anyway, it is often the decision that makes the rest of the work easier. Scaffold, edge protection and access are paid for once if the trades are sequenced properly.

Weight works in your favour in this direction and against you in the other. A tile roof is heavy, and the framing beneath it was designed to carry that load, so removing tiles and fitting a lighter metal covering leaves the structure comfortably within what it was built for. Going the other way, from metal to tile, adds load the framing was never designed for and needs engineering assessment before anyone starts. That asymmetry is why conversions overwhelmingly run one direction. It also removes the biannual habit of finding a cracked tile after every storm.

The batten system changes completely and this is where the work sits. Tile battens are spaced for the tile gauge and are not suitable for sheet roofing, so the old battens come off and new ones go on at the spacing the sheet profile and the wind classification require. On some roofs the existing rafters need packing or straightening first because tiles hid a multitude of small inconsistencies that a long straight sheet will not. This is normal work and it should be in the quote.

Pitch is the constraint that occasionally rules a conversion out. Sheet profiles each have a minimum roof pitch, with corrugated profiles needing more fall than concealed fix profiles such as the trapezoidal and standing seam types, and a very low pitch roof may need a particular profile or a different approach entirely. A competent contractor measures the pitch rather than assuming. Where the pitch is marginal, ask which profile is being specified and what its minimum pitch is. The framing check is part of the job either way, so it is not an argument against converting.

Some things about the house will change and it is better to know beforehand. Metal roofs are noisier in heavy rain than tiles, though sarking and ceiling insulation reduce that a great deal, and the thermal behaviour differs because tiles hold heat while steel sheds it quickly. Eaves, fascia and gutter lines sometimes need adjusting to suit the new roof height. None of these are problems, and all of them are easier to accept when someone mentions them in advance. Ask what the contractor intends to do about any rafters that are out of line.

Gutters are usually replaced as part of a conversion and it makes sense to do so. The old gutters have been on as long as the tiles, the roof line changes slightly, and the access is already paid for. The gutter replacement page covers the choices and the gutter and downpipe installation page covers the wider work. Doing it later means paying for scaffold twice.

Heritage and character areas are the exception that needs checking. Parts of Fremantle, Guildford, York, Northam and several inner Perth suburbs carry heritage listings or character provisions, and replacing a terracotta tile roof with Colorbond in one of those may require approval or may not be permitted at all. The same applies to some newer estates through restrictive covenants on the title. A call to the local government before you commit avoids an expensive misunderstanding. Ask about noise specifically if a bedroom sits directly under the roof with no room above it. Most owners who have made the change say it took about a fortnight to stop noticing.

Materials, Profiles and Coastal Grades

Colorbond steel is the default replacement across most of Western Australia and it earns that position. It is light, it comes prefinished in a wide colour range, it carries a manufacturer warranty when installed to specification, and it suits the state's climate well. Lysaght, Stramit and Fielders all roll profiles for the local market from Bluescope steel, and the familiar names include Custom Orb corrugated, Trimdek and the concealed fix Klip-Lok range. Which profile suits depends on pitch, span and appearance. The valley gutters are also worth checking at the same time, since they are the part of a tile roof that most often fails quietly.

Coastal exposure is the single most important material decision in Perth and it is regularly got wrong. Standard Colorbond is not intended for use very close to breaking surf, and properties within a few hundred metres of the ocean need the coastal grade product, with the marine grade specified closer still. Perth's coastal strip runs the length of the metropolitan area and takes in a great many suburbs from Yanchep to Mandurah. Ask which grade is quoted and how the contractor determined the distance, because the warranty depends on it. Covenants on newer estate titles sometimes restrict roof material and colour as well.

Salt is not the only corrosion source and swimming pools matter more than people expect. Chlorine and salt water pool environments accelerate corrosion on metal roofs and on fixings, and a roof overlooking a pool in a sheltered courtyard sees more of it than one exposed to rain washing. Unwashed areas, meaning parts of the roof that rain never reaches such as under eaves and behind parapets, corrode faster than washed ones. A contractor thinking about that detail is thinking about the twenty year outcome. Profile choice also affects how much the roof will be noticed from the street. Corrugated profiles also suit a low set roof better than the deeper trapezoidal ones do on some houses.

Fixings and flashings need to match the sheet and this is a common shortcut. Mixing metals causes galvanic corrosion, so the fasteners, flashings, gutters and any penetration fittings need to be compatible with the roof sheet, and the fastener grade needs to suit the exposure just as the sheet does. A premium sheet fixed with cheap screws will fail at the screws. Ask what class of fastener is specified rather than assuming it follows the sheet. Ask for the distance to be recorded on the quote so the warranty position is documented.

Concrete and terracotta tiles remain valid choices and are sometimes the right answer. A tile roof is quieter in rain, holds thermal mass which some owners prefer, and suits houses where the architecture calls for it. Terracotta carries its colour through the body of the tile rather than in a surface coating, lasts a very long time and costs accordingly, and remains the correct material on many heritage buildings. Bristile and Monier are the names most commonly seen on Western Australian tile roofs.

Colour has a real performance effect in this climate rather than being purely aesthetic. Lighter roof colours reflect more solar energy and run cooler, which lowers the roof space temperature and reduces the load on cooling through a Perth summer. Manufacturers publish solar reflectance figures so the claim can be checked rather than taken on trust. Where a covenant or a heritage provision restricts the colour, that constraint comes first, and the exterior painting page covers coordinating the rest of the exterior with a new roof colour. Stainless fixings are specified in the more severe exposures and they cost more for good reason.

Structure, Battens, Sarking and Insulation

The framing is inspected once the covering is off and this is the moment to deal with anything found. Rafters, purlins, top plates and ceiling joists are checked for rot, termite damage, splitting and sag, and sections that need replacing are far easier to reach now than they ever will be again. Western Australia's termite pressure means roof framing damage is a real possibility on any older home, particularly where nobody has been in the roof space for years. The carpentry services page covers structural repairs, and where there is any doubt the structural inspection page covers getting it assessed. Terracotta also weighs more than concrete tile in some profiles, which matters on an older frame.

Battens are replaced as a matter of course on a full replacement. Timber battens that have carried a tile roof for forty years are rarely in a condition to carry a new one, and steel battens are commonly used on metal roof conversions for straightness and consistency. Spacing follows the sheet profile and the wind classification, which is why the wind region question is not academic. A quote that reuses existing battens on a conversion deserves a direct question about why.

Sarking is the layer most worth understanding because it does several jobs at once. A reflective foil or breathable membrane laid over the battens reflects radiant heat, catches any wind driven rain or condensation that gets past the covering, keeps dust out of the roof space and reduces noise under a metal roof. In bushfire prone areas it also plays a role in ember protection. It is inexpensive relative to the job and it is the wrong place to economise. Any framing repair found here should be photographed before it is covered up again. Keep those photographs with the job file, since they are the only record you will ever have.

Condensation is better understood than it used to be and it matters in parts of this state. A sealed, well insulated house with a metal roof can generate condensation on the underside of the sheeting in cooler months, particularly in the South West and the hills, which then drips into the insulation. Vapour permeable sarking and proper roof space ventilation deal with it. The roof ventilation and whirlybird installation page covers the ventilation side. Steel battens also give the installer a consistent plane to work from on an old roof.

Insulation is best dealt with while the covering is up, since you will never have this kind of reach into the ceiling space again. Ceiling insulation in older Perth homes is frequently thin, compressed, gappy or simply absent in places, and topping it up or replacing it from above takes a fraction of the effort it would take later from inside the roof space. The difference to summer comfort in a Perth house is substantial. The ceiling and wall insulation page covers bringing it up to a sensible standard. Ask which sarking product is specified and what its fire and vapour ratings are.

Ceilings below sometimes need attention once the work is done. Old water stains become visible, cornice cracks open up from the vibration of the strip out, and a ceiling that was already sagging may need attention. A good contractor warns you that this can happen rather than denying responsibility afterwards. The ceiling repairs page covers putting it right. Insulation sitting hard against the underside of the sheeting makes condensation more likely rather than less. Where downlights are fitted, the clearances around them have to be maintained under the new insulation.

Wind classification drives the fixing specification and it varies enormously across Western Australia. Perth and the south west sit in the lowest wind region, while the coast from roughly Carnarvon northwards sits in cyclonic regions where the fixing pattern, batten spacing, tie down and sheet thickness all step up. Cyclone washers and closer fastener spacing are standard practice in those areas. Any contractor quoting north of the twenty sixth parallel should be naming the wind classification in the quote. Where insulation is being replaced entirely, it is worth asking for the old material to be removed and disposed of rather than left in place under the new batts.

Permits, Licensing and Insurance in WA

Building approval in Western Australia runs through the state's building permit system, administered by local government. Whether a roof replacement needs a permit depends on what is being changed, with structural work and changes to the building fabric generally requiring one while some like for like work may not. Because councils apply this differently and the value of the work matters, the answer comes from your local government rather than from the contractor. Every local government in the state can be found through wa.gov.au, and the building services counter is the one to ask for. Cornices and downlights are the usual places a crack appears, and both are easily repaired.

Builder registration applies to residential building work above a value threshold in this state. A roof replacement on a house frequently exceeds that figure once the whole job is counted, which means the work needs to be carried out by or under a registered builder. Roofing contractors commonly work under a registered builder for exactly this reason. Ask who the registered builder on your job is and get the registration number. Fixing patterns in cyclonic areas are inspected more closely for good reason. Material availability also runs differently in the north, so allow longer for delivery.

Home indemnity insurance is the protection most often skipped and most valuable when it is needed. For residential building work above a set value, the registered builder must take out home indemnity insurance before accepting payment or starting work and provide the certificate to the owner. It covers you where the builder dies, disappears or becomes insolvent partway through. A roof replacement is exactly the sort of job where being left halfway would be catastrophic, so ask for the certificate before any money changes hands.

Written contracts are required for residential building work within a defined value range in Western Australia, with prescribed terms and limits on deposits. A roof replacement sits comfortably inside that range on most houses. The contract should name the scope, the materials by product and grade, the program, the payment stages and the warranties. A one page quote with a total and a bank account number is not a contract. Ask whether the contractor has done work in your local government area recently.

Safety on a roof is regulated and it is visible from the street. Work at height requires proper edge protection or scaffold, and a crew working off a ladder on a two storey pitched roof is cutting corners that could kill someone on your property. Workplace safety in this state is administered by WorkSafe WA. A contractor whose quote includes scaffold is not padding it, they are doing the job lawfully. The certificate is also useful evidence if the house is sold within the warranty period.

Bushfire requirements apply in designated areas and they reach the roof directly. Properties in bushfire prone areas have construction requirements that cover ember entry, including roof and eaves detailing, sarking, gutter and valley protection and the sealing of gaps, with the level set by the assessed bushfire attack level. Much of the Perth Hills, the South West and countless regional towns are affected. Bushfire construction guidance for Western Australia comes from the Department of Fire and Emergency Services, and the gutter guard installation page covers one common element of it. Payment stages tied to completed work protect both sides and are entirely normal.

Consumer protections apply in addition to all of that. Australian Consumer Law guarantees, with the ACCC as the national regulator, oblige the contractor to work with due care and skill and the materials supplied to be fit for purpose, and they sit alongside the manufacturer warranty on the roof sheet rather than replacing it. Complaints about residential building work in Western Australia have a defined path through the state's building services regulator. Keeping the contract, the product specifications and photographs is what makes any of that usable.

Solar Panels, Asbestos and What Else Comes Up

Solar panels are on a very large share of Western Australian roofs and they complicate a replacement. The array has to be removed before the old roof comes off and reinstalled onto the new one, which is electrical work requiring an accredited installer rather than something the roofing crew can do. Removal and reinstatement commonly runs $900 to $2,600 depending on the system size and whether the mounting rails suit the new roof. The solar panel installation page covers that side, and it is worth confirming who books it. Ember protection is one of the reasons sarking matters as much as it does in those areas.

Mounting hardware often needs changing with the roof type. Tile roof mounting brackets do not suit sheet roofing, so a conversion generally means new rails and feet, and those penetrations through a new roof need flashing properly rather than sealing with silicone. A badly mounted array on a new roof is a leak waiting for the first winter. Ask how the array will be fixed and flashed on the new covering. Photographs taken at each stage are the most useful record an owner can keep.

Asbestos is the other thing that changes a job substantially. Cement sheet roofing, eaves lining and sometimes sarking on homes built before the late 1980s may contain asbestos, and a roof of that material cannot be removed as ordinary roofing work. Testing settles it and licensed removal follows where it is confirmed. The asbestos testing and inspection page covers establishing what you have, and the asbestos removal page covers the licensed pathway. Book the solar removal and the roofing crew through one point of contact if you can.

Roof penetrations accumulate over a house's life and each one is a decision. Whirlybirds, evaporative cooling units, flues, vent pipes, skylights, aerials and old redundant penetrations all need either reinstating properly into the new roof or removing and closing up. Redundant penetrations are worth closing rather than keeping. Walk the list with the contractor before the quote is finalised so nothing is assumed.

Gutters, fascia and downpipes are usually on the same clock as the roof. Rusted gutters, rotted timber fascia and downpipes discharging in the wrong place are all far cheaper to deal with while access is in place. Stormwater on a Perth block usually discharges to soakwells rather than the street, so a roof replacement is also a sensible moment to check that system is coping. The roof and gutter plumbing page covers the plumbing side of that work. Testing is inexpensive and it removes any argument about what the material actually is.

Strata properties have their own process and it needs starting early. On a strata scheme the roof is commonly common property, which makes replacement a decision for the strata company rather than an individual owner, funded from the reserve or by levy. Individual owners in a survey strata or a small scheme may have different arrangements again. Reading the scheme documents and speaking to the strata manager before getting quotes saves a great deal of wasted effort. Removing a redundant penetration also removes a future leak point permanently.

Costs in Detail

A tile to Colorbond conversion runs $85 to $160 a square metre across the Perth metropolitan area including strip out, new battens, sarking and the new covering. The spread reflects roof pitch, complexity, single or two storey, the profile chosen and the coastal grade required. A simple gable roof on a single storey home sits at the lower end and a complex hipped roof with valleys on a two storey house sits at the top. Disposal of the old tiles is a real cost within that figure. Soakwells that were adequate for the original house often are not after twenty years of additions.

Replacing a metal roof like for like runs $70 to $130 a square metre, which is lower because the batten system usually stays compatible and the strip out is lighter work. Replacing concrete tiles with concrete tiles runs $80 to $150, and terracotta runs $120 to $220 because the material itself costs considerably more. Heritage terracotta requiring a matched profile sits above that again. Ask for the material and labour split so you can see where the money is going.

For a typical single storey Perth home, the whole job commonly lands between $14,000 and $38,000. That range assumes a roof area in the ordinary domestic bracket, and it moves well beyond the top for large homes, two storey work, complex rooflines, coastal grade material or cyclonic region specifications. Getting the roof area measured properly rather than estimated from the floor plan is the first step to a meaningful number. Roof area is always larger than floor area because of the pitch and the eaves. Measure the roof area properly before comparing per square metre rates between quotes.

New battens and sarking run $18 to $40 a square metre where they are itemised separately. Structural repairs found once the roof is off are the genuine variable, and a sensible quote carries a provisional sum for them rather than pretending none will arise. Ask what rate applies to structural repairs and how they will be documented before the work proceeds. That single question prevents most of the disputes in this trade. Freight on tile is a real cost in regional areas and it shows in the figure.

The additional items add up and belong in the comparison. Solar removal and reinstatement runs $900 to $2,600, asbestos roof removal and disposal runs $55 to $110 a square metre, scaffold on a two storey home is a meaningful line, and gutter replacement at the same time adds its own figure while saving money overall. Insulation upgraded from above while the roof is open is cheap relative to doing it later. Getting all of these priced at once gives you a real project figure. A roof plan with the areas marked makes every quote easier to compare.

Regional Western Australia prices differently rather than simply higher. Contractors based in Bunbury, Albany, Geraldton and Kalgoorlie work at broadly comparable rates within their own areas, while metropolitan crews travelling out add mobilisation and accommodation. In the north, cyclonic specifications, material freight and a smaller pool of contractors all push figures up, and availability is often the harder constraint. Booking ahead matters more in those areas than negotiating hard does.

What to Look Out For

Be very wary of door knockers offering roof work, particularly after a storm. Storm periods across Perth and the South West bring operators moving through affected suburbs offering immediate work, taking deposits and delivering little. Established local roofing businesses do not generally find work by knocking on doors. Verify the business, check the registered builder details and never pay a large deposit to someone who arrived uninvited. Ask whether the insulation upgrade can be quoted as an option rather than bundled in.

Check that the coastal grade is specified in writing on any property near the ocean. Standard grade steel used close to breaking surf will corrode early and the manufacturer warranty will not apply. Ask which grade is quoted and how the distance from the coast was determined. This is one of the most consequential and most commonly fudged items in a Perth roofing quote. Where a crew has to stay away overnight, accommodation normally appears as its own line and you are entitled to see it.

Watch for a quote that says nothing about battens, sarking or structural repair. Those three items are where a cheap conversion hides, and once the new roof is on nobody can see what was done underneath. A quote that names the batten type and spacing, the sarking product and a provisional allowance for structural work is a quote from someone who has thought about the job. One that offers a price per square metre and nothing else is not comparable with it. The registration number can be checked against the state register, and doing so takes a couple of minutes. Ask as well whether the contractor carries public liability cover and for how much.

Ask about the registered builder and the home indemnity insurance before paying anything. Both are legal requirements above the relevant thresholds in Western Australia and both protect you rather than the contractor. A business that becomes vague at this question is telling you something important. Getting the certificate up front takes one email. A proper coastal grade is not a premium option, it is the correct specification for that location.

Be careful about scaffold being left out to win the job. Working at height on a domestic roof requires proper edge protection, and a quote that omits it is either not doing it or will add it later as a variation. Neither outcome is good for you. Ask whether scaffold is included and what form the edge protection takes. Ask what happens if the battens turn out to be unusable once the tiles come off.

One last thing, treat a roof report from the company quoting the work as a sales document rather than an assessment. It may be entirely accurate and it is written by someone with an interest in the answer. Where the decision between restoring and replacing is genuinely close, an independent inspection costs a few hundred dollars against a job measured in tens of thousands. That is the cheapest insurance available on this page.

How to Get Comparable Quotes

Gather the details before you start ringing. The roof area if you know it or the house floor area and rough shape if you do not, single or two storey, roof pitch if you can estimate it, what covering is on there now and roughly when the house was built, whether there are solar panels and how many, what penetrations exist, and how close you are to the coast. Photographs from the ground on each side of the house, plus one of the roof space if you can access it safely, help a great deal. A quote that omits it is not cheaper than one that includes it, it is just incomplete.

Give every contractor the same written brief and the same questions. The material and grade including the coastal classification, the profile, the batten type and spacing, the sarking product, the wind classification designed to, whether scaffold is included, what happens with the solar panels, the provisional allowance for structural repair, whether gutters are included, the program and how much roof will be open at once, the registered builder details, home indemnity insurance and the warranties on both material and workmanship. Written answers to that list are what turn three prices into a genuine comparison, and a contractor who supplies them has already shown you how the job will be run. Anything answered verbally on the day tends to be remembered differently by each side later.

Ask for the warranty position to be set out clearly. Roof sheet manufacturers warrant their product when it is installed to specification and in the right environment, and the contractor separately warrants their workmanship for a shorter period. Those are two different documents with different conditions and different durations. Ask for both in writing rather than accepting a single stated number of years. Note the roof pitch as best you can, since it affects both the method and the material options.

Price the adjacent work at the same time rather than separately. Gutters, downpipes, fascia, insulation, roof ventilation and solar handling are all cheaper while the access is in place, and a quote covering the lot is a real number for the outcome you want. It also lets you compare contractors on the same scope. A contractor willing to itemise each of those is easy to compare with another one who does the same. Ask each contractor to name its exclusions as plainly as its inclusions.

Book outside the wet season and outside the post storm rush. Roofing demand in Western Australia climbs after every significant winter front and through spring, when availability tightens and nobody is sharpening their pencil. Late summer and autumn bring better weather for the work itself and better scheduling. If the roof is leaking now, that is different, and a make safe repair to get through until a proper replacement can be scheduled is often the sensible interim step. Ask what the manufacturer requires in terms of maintenance for the warranty to stay valid.