Cracked or Leaking Tinny?
Tell us the make and hull type, where the damage is, how the boat is used and where it is kept, and we'll connect you with Victorian aluminium boat repairers.
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Typical Boat Welding Costs VIC
Small hull crack or split seam$300 - $900
Larger crack with backing plate$600 - $1,700
Leaking rivets resealed or replaced$250 - $900
Keel strip or skid repair$400 - $1,200
Transom repair or rebuild$1,500 - $6,000
Floor and underfloor foam replacement$1,500 - $5,000
Rod holders, rails or bait board mounts$250 - $1,200
Fuel tank work, gas freed firstSpecialist quote
Figures are indicative 2026 VIC estimates and vary with the hull type, hidden damage under the floor, fuel tanks, paint and survey requirements. Get a written quote after an inspection, and check current Victorian marine safety requirements before relying on any figure.
Aluminium Boat Welding Repair Services VIC 2026 - Get Quotes
Victoria's aluminium fleet works hard in some demanding water. Plate boats cross the Rip at Port Phillip Heads and the bar at Lakes Entrance, tinnies run the shallows of Western Port and the Gippsland Lakes, and freshwater boats spend summers on Lake Eildon, Lake Hume and the Murray. All of that pounding, launching and trailering eventually shows up as cracks at frames and ribs, weeping rivets, transoms working loose under a heavy outboard, and corrosion where stainless fittings meet alloy in salt water. A good repairer finds the cause before touching the weld, because a crack that came from hull flex, a badly set up trailer or galvanic corrosion will simply return if only the symptom is fixed. Riveted and welded hulls also need different approaches. Most small hull repairs cost between $300 and $900, while a transom rebuild or a new floor runs into the thousands. Winter is the quiet season for Victorian marine workshops, so a boat booked in before spring usually goes back on the water sooner and often cheaper. Post your job on The Quote Yard to reach Victorian aluminium boat repairers.
At a Glance - Common Repairs on Victorian Boats
| Repair | Usual Cause | Hull Type | Typical Cost | Watch For |
|---|---|---|---|---|
| Crack at a rib or frame | Pounding and hull flex | Plate boats mainly | $300 - $1,700 | Cause of the flex |
| Weeping rivets | Age, flex, trailer loads | Riveted tinnies | $250 - $900 | Welding near rivet lines |
| Keel or skid damage | Beaching and ramps | All hulls | $400 - $1,200 | Thin metal along the keel |
| Transom movement | Heavy outboard, fatigue | All hulls | $1,500 - $6,000 | Water in timber cores |
| Soft or corroded floor | Water trapped in foam | Mainly older boats | $1,500 - $5,000 | Corrosion under the floor |
| Corrosion at fittings | Dissimilar metals, stray current | All hulls | Varies with extent | Isolation and anodes |
Riveted Tinnies and Welded Plate Boats
Victoria's aluminium fleet splits into two families that need quite different repairs, and knowing which you own shapes every conversation with a repairer.
Pressed and riveted boats are built from relatively thin sheet formed over frames and joined with thousands of rivets, and brands familiar at every Victorian ramp include Quintrex, Stacer, Savage and Sea Jay. They are light, easy to tow and economical to run, and their hulls flex a little by design. That flexing eventually works rivets loose, which is why an older tinny weeps around the chines and the floor seams rather than cracking dramatically. Welding right next to a rivet line on thin sheet can buckle the panel and loosen neighbouring rivets, so repairers often reseal or replace rivets instead.
Welded plate boats are built from thicker plate with welded seams and internal framing, and Melbourne based Bar Crusher sits alongside Stessl, Formosa and imported brands such as Stabicraft and Surtees in this part of the market. They handle Bass Strait chop and bar crossings far better, and because they are already welded, repairs to hulls, transoms and fittings are straightforward for a specialist. Their failures tend to be fatigue cracks at frames, ribs and welded joints where the hull works hardest. General alloy repairs beyond boats, such as trays and gates, are covered under aluminium welding.
Cracks, Splits and Persistent Leaks
Most cracks in aluminium hulls start where the metal is restrained, which usually means at a rib, a frame, a bulkhead or the end of a weld. Pounding in short, steep seas is the main driver, and Port Phillip in a strong southerly or Bass Strait on a rough day both produce exactly that motion. A repairer normally drills a small stop hole at each end of the crack to halt it spreading, grinds out the damaged metal, welds it up with a suitable filler and then adds a doubler plate or extra framing where the hull needs stiffening. Fixing only the crack without addressing the flex usually buys a season or two at best, and owners who keep finding new cracks in the same area are looking at a hull that needs more support, not more welding.
Leaks are harder to trace than cracks, because water travels along the inside of a hull before it appears. Repairers use a few methods, including filling the bilge and watching for weeping, pressure testing sealed compartments, or running water over the outside while someone watches from inside. Hairline cracks often show as a dark line in the paint or a fine trail of corrosion products. Once found, the repair depends on the hull type, with welded boats simply rewelded and riveted boats often resealed instead. Watch the bilge over the first few outings after a repair, because some leaks only reappear once the hull has worked in a decent chop.
| Problem | Usual Location | Repair Approach |
|---|---|---|
| Fatigue crack | At ribs, frames and weld ends | Stop holes, reweld, add stiffening |
| Impact damage | Bow, keel, chines | Cut out and let in new plate |
| Weeping rivets | Chines and floor seams | Reseal or replace rivets |
| Split weld seam | Plate boat hull joints | Grind out and reweld |
| Pinholes from corrosion | Under floors and in bilges | Assess extent, patch or replate |
| Cracks around fittings | Rod holders, cleats, rails | Reweld with a spreader plate |
Transoms, Outboards and Bracket Loads
The transom carries the entire thrust and weight of the outboard, and it takes every wave the boat lands on. Signs of trouble include flexing when the motor is trimmed, cracks radiating from the mounting bolts, water staining inside the transom, and a motor that sits slightly askew. Older boats often have timber cores inside an aluminium transom, and when water gets in through bolt holes the timber rots quietly for years. Repowering with a heavier four stroke than the boat was designed for is a common cause of trouble in Victoria, where owners upgrade motors on hulls built for lighter two strokes. The extra weight hangs a long way behind the transom, and that multiplies its effect.
Repairs range from rewelding a cracked transom bracket to rebuilding the whole transom with new plate, new framing and modern composite or aluminium coring. The work usually means removing the motor, the splash well and sometimes the floor, so it is a workshop job instead of a ramp side fix. Before committing, check the boat's rated maximum motor weight and power on its builders plate, because exceeding it affects safety, insurance and the repair design. A repairer who asks about the motor and how the boat is loaded is thinking about the cause not the symptom. Mobile welders can handle some fittings and rails on site, and mobile welding repairs cover work that cannot travel. Larger structural jobs still belong in a workshop where the boat can be supported properly.
| Transom Symptom | Likely Cause | Typical Repair |
|---|---|---|
| Flex when trimming the motor | Weak or cracked structure | Reweld and add framing |
| Cracks from mounting bolts | Heavy motor, fatigue | Plate the area, spread the load |
| Water stains inside transom | Leaking bolt holes | Rebed fittings, dry and seal |
| Soft or rotten core | Water in timber core | Rebuild with new core |
| Motor sits crooked | Distorted transom | Straighten and reinforce |
| Corrosion at the bracket | Dissimilar metals and salt | Isolate, replace fasteners |
What Hides Under the Floor
The area between the floor and the hull is where most expensive surprises live, and it is invisible until someone lifts the deck.
Many aluminium boats have closed cell foam under the floor for buoyancy, which is a safety feature and often a requirement of the original design. Over years the foam can absorb water through damaged floors, leaking fittings and cracked welds, and saturated foam holds moisture permanently against the hull plate and the frames. That trapped water drives corrosion from the inside out, which is why a hull that looks sound from outside can be pitted and thin underneath. The usual warning signs are a boat that feels heavier on the trailer than it used to, water that never quite dries out of the bilge, a floor that flexes underfoot or sounds hollow, and staining or white powdery deposits around floor fixings. Investigating means removing the floor, which is why repairers often quote an inspection separately before pricing the full job. Once open, the extent is usually clear, and the work may involve removing old foam, cleaning and treating the hull interior, repairing or replating corroded sections, fitting new closed cell foam and laying a new floor. Costs commonly run $1,500 to $5,000, and more where corrosion has gone through the plate. Keeping bungs out when the boat is stored, and drying the bilge after use, slows the whole process considerably. Boats stored on a hardstand or under cover fare better than those left uncovered in the weather, and a carport installation at home keeps rain and sun off both boat and trailer.
What a Good Inspection Covers
Before any quote on a significant repair, a competent marine repairer spends time inspecting instead of estimating, and owners should expect that process to take an hour or more on an older boat. The hull comes first, checked outside for dents, scrapes, previous repairs, hairline cracks and corrosion around fittings, then inside for cracked welds at ribs and frames, pitting in the bilge and signs of water where it should not be. The transom is checked for flex, cracks around the motor bolts and water staining, and the floor is pressed and tapped for soft spots that suggest wet foam. Fittings are inspected for corrosion at the fasteners, and anodes for how much is left. The fuel system is identified, including where tanks sit relative to the proposed work. The trailer is worth a look at the same time, given that roller and bunk problems often explain hull damage. On boats where corrosion is suspected under the floor, the repairer may recommend opening a section before quoting, which is an honest approach not a sales tactic. Photographs taken during the inspection should form part of the quote. Owners should ask what was found, what is urgent, what can wait a season and what the repair will cost if more damage appears once the floor is up. Where heavy boats need lifting or supporting at home, a solid concrete slab makes the work safer.
Floors, Bilges and Older Boats
Replacing a floor is a substantial job, so it pays to understand what the money buys. The old floor and foam come out, the hull interior is cleaned and inspected for corrosion, any thin or pitted plate is repaired, and new foam and flooring go back in. Many owners take the opportunity to improve drainage, add inspection hatches and relocate wiring and plumbing so future checks are easier. On older boats, this is often the point where the repairer discovers whether the hull is worth further investment. An honest assessment at that stage saves owners from spending heavily on a boat near the end of its life. Good repairers would rather lose one job than do work they know is not worth doing.
Prevention comes down to routine rinsing and a few cheap fittings. Rinse the boat and flush the bilge with fresh water after salt water trips, particularly after launching at Queenscliff, Sorrento, Hastings or Lakes Entrance, and pull the bungs and store the boat nose high so water drains out rather than pooling at the transom. Check floor fixings and hatch seals each season, and repair small leaks before they soak the foam. Cover the boat or keep it undercover where possible, as months of rain sitting in a bilge cause more damage than a season of fishing. A fitted cover pays for itself over a few winters, and a cover that drains properly beats a tarp that traps water against the hull.
Corrosion, Stray Current and Mixed Metals
Aluminium holds up well on its own, yet it corrodes quickly when it touches a different metal with salt water between them, which boaters usually call electrolysis and engineers call galvanic corrosion. Stainless steel bolts through a hull, bronze fittings, a steel trailer bracket bearing directly on alloy and copper based antifouling paint all set it off, and copper antifouling should never be used on an aluminium hull. Boats kept in marina berths around Port Phillip and the Gippsland Lakes face an extra risk from stray current leaking through shore power or nearby wiring. The damage shows as white powder, pitting and, in bad cases, holes straight through the plate around fasteners. Boats kept permanently in the water show it first, so marina berthed alloy boats need closer watching than trailer boats.
A lasting repair removes the corroded metal, welds in new plate and then fixes the cause, isolating dissimilar fasteners with nylon or neoprene washers and an anti corrosion compound. Sacrificial anodes, the soft metal blocks bolted to the hull and outboard that corrode away in salt water so the boat's own metal does not, need checking each season and replacing when they are around half consumed, since an anode that is finished offers no protection at all. Where a boat corrodes faster than its neighbours at the same marina, an electrical problem on board or nearby is worth investigating. Painted and anodised surfaces should be repaired after welding to restore protection. Owners who keep boats on trailers instead of in the water avoid most of these problems entirely, and that is one reason the majority of Victorian recreational boats live at home between trips.
| Cause | Where It Shows | Prevention |
|---|---|---|
| Stainless fasteners in alloy | White powder around bolts | Isolating washers and compound |
| Copper based antifouling | Severe pitting on the hull | Use alloy safe antifouling only |
| Steel trailer contact | Marks at rollers and skids | Rubber or plastic contact surfaces |
| Stray current in marinas | Rapid pitting, anodes gone | Check shore power and wiring |
| Spent anodes | Corrosion near the outboard | Replace at about half worn |
| Trapped salt water | Bilges and under floors | Rinse and drain after every trip |
Victorian Water and What It Does to Hulls
Where a boat is used shapes the repairs it will need. Port Phillip is shallow for its size, which means a strong wind against the tide builds a short, steep chop that pounds hulls far harder than the distance offshore suggests, and the entrance at Port Phillip Heads, known as the Rip, is one of the more demanding pieces of water in the country on the wrong tide. Boats fishing the snapper season through spring and early summer put in long hours in that chop, and fatigue cracks at frames and ribs follow. Western Port has strong tidal streams and shallow banks, with beaching and grounding damage more common than deep water pounding. The Gippsland Lakes offer sheltered running, but boats crossing the bar at Lakes Entrance take heavy loadings in a short space, and it is the state's main ocean bar for trailer boats. The far east around Mallacoota, the west from Apollo Bay to Portland and Port Fairy, and the exposed stretch off Phillip Island all add Bass Strait swell. Fresh water on Lake Eildon, Lake Hume and the Murray is gentler on metal, though beaching on gravel and submerged timber cause their own damage, and houseboat pontoons need their own repairs. Summer drawdown on Eildon can also leave hulls sitting on rock that was underwater a month earlier. Salt water boats need rinsing after every trip, while freshwater boats still need bilges dried out. Tell the repairer where the boat is used, as it explains what they are looking for. Boats kept at home between trips benefit from a firm, level surface, and driveway installation contractors can build hardstand space beside the house.
Fuel Tanks, Gas Freeing and Fire Risk
Welding anywhere near a fuel tank is the most dangerous work on an aluminium boat, and it is the area where owners should be most cautious about who they hire. Petrol vapour inside a tank, or in the confined space beneath a floor, can ignite from a spark or the heat conducted along the metal, and the result is an explosion rather than a fire. Underfloor tanks in many Victorian trailer boats sit directly below the deck, so a repair to a floor or a hull section may put the welder within centimetres of one. Tanks must be drained, removed where possible, and properly gas freed by someone who does this work, with testing to confirm the atmosphere is safe before any heat is applied. Any repairer who treats this as optional should not be working on your boat.
A repairer who proposes welding near a full or untested tank should be declined outright. Fuel lines, filters, batteries and gas bottles for cookers should be removed or isolated before work starts, and the area ventilated throughout. Upholstery, carpet, wiring and fibreglass components near the weld need protection from heat and spatter. Many workshops will not quote tank work at all and refer it to specialists, which is a sign of good judgement rather than a lack of skill. Workplace safety requirements for hot work of this kind are set out by WorkSafe Victoria, and owners should expect a competent repairer to talk through the fuel system before quoting.
Trailers That Damage Hulls
A surprising share of hull damage starts on the trailer instead of on the water. Rollers set too far apart or adjusted unevenly concentrate the hull's weight on a few small points, and over hundreds of kilometres of towing that creates dents, stress lines and eventually cracks, particularly on thinner riveted hulls. Skid trailers spread the load better but need their bunks aligned and padded correctly. Winching the boat hard against a misaligned bow stop can distort the bow, and driving with a loose boat lets it shift and hammer the supports. Damage of this kind usually appears as a line of marks along the hull matching the roller positions, and running a hand along the hull with the boat on the trailer often finds it.
Having the trailer checked when the hull is repaired prevents an expensive repeat. Adjusting rollers and bunks so the load is spread along the strong parts of the hull, replacing perished rubbers and making sure the boat sits fully home against the bow stop are quick jobs for a trailer specialist. Galvanized trailers that have been dunked in salt water for years also rust from the inside, and a failed trailer can damage the boat it was meant to carry. Trailer repairs are a separate job, and trailer welding repairs businesses can look over the trailer during the same visit as the hull work.
Standards, Consumer Rights and Insurance
Boat repairs are not a licensed trade in Victoria, so the protections available to owners come from standards, consumer law and insurance.
Welded aluminium structures are designed and built to AS/NZS 1665, and small pleasure boats are covered by AS 1799.1, which addresses construction and safety requirements for recreational craft. The Australian Builders Plate gives the boat's rated capacities, and the original builder's specifications are the reference point for any substantial structural repair. Under the Australian Consumer Law, repairs must be carried out with due care and skill and be fit for purpose, which gives owners recourse where a weld fails prematurely because of poor workmanship. Written quotes describing the work, the materials and any warranty make that far easier to pursue. Boat insurance policies often require repairs to be carried out to a reasonable standard, and some ask for evidence of professional repair after damage, so keeping documentation is sensible. Commercial vessels face additional requirements under the national system for domestic commercial vessels. Repairers themselves must manage welding fume, hot work, confined spaces and fuel hazards under Victoria's workplace safety laws. For owners, the practical checks are experience with marine alloy, a clear written quote, public liability insurance and a sensible approach to fuel systems. Consumer rights on repair work are explained by Consumer Affairs Victoria, and disputes that cannot be resolved directly can be taken to VCAT.
Builders Plates, Registration and Survey
Most recreational boats built or imported since the mid 2000s carry an Australian Builders Plate, which states the maximum engine power, the maximum load and the number of people the boat is designed for. That plate matters during repairs, as rebuilding a transom for a heavier motor than the boat is rated for changes its safety and may affect insurance. Where a repair substantially alters the structure, the repairer should work to the design intent of the original builder. Aluminium structural work follows AS/NZS 1665, and AS 1799.1 covers design and construction requirements for small pleasure boats. Repairers working to those references produce work that stands up to scrutiny later.
Recreational vessels with motors must be registered in Victoria, and operators need a marine licence, with the state's marine safety rules administered through Victorian transport agencies and information available at vic.gov.au. Commercial vessels, including charter and fishing boats, sit under the national system administered by the Australian Maritime Safety Authority, and structural repairs to a vessel in survey generally need the surveyor consulted before and after the work. Keeping receipts, photographs and any engineering advice with the boat's papers helps at sale time and with insurance claims. Recreational owners should weigh a repairer's experience with alloy hulls more heavily than any paperwork.
| Trailer Issue | Effect on the Hull | Fix |
|---|---|---|
| Rollers unevenly adjusted | Dents and stress lines | Reset rollers along the load path |
| Worn or missing rubbers | Metal on metal contact | Replace rubbers and pads |
| Misaligned bow stop | Distorted bow | Realign and rewinch correctly |
| Loose tie downs | Hull hammers the supports | Secure properly before towing |
| Rusted trailer frame | Sudden failure risk | Repair or replace sections |
| Steel brackets on alloy | Galvanic corrosion marks | Isolate contact surfaces |
Hull Brands, Alloys and Consumables
Knowing the boat's origins and materials helps a repairer plan the work and source matching parts.
Pressed and riveted hulls on Victorian ramps commonly carry the Quintrex, Stacer, Savage and Sea Jay names, while welded plate boats include the Melbourne built Bar Crusher along with Stessl, Formosa and imported brands such as Stabicraft and Surtees. Hull plate is usually a 5000 series marine alloy such as 5083 or 5052, chosen for its resistance to salt water, and repairs are normally welded with 5356 filler wire to match. Extruded sections used in rails, frames and fittings are often 6000 series. Shielding gas comes from suppliers such as BOC, Coregas and Supagas, with pure argon the standard for alloy work. Anodes, sealants and marine fasteners are stocked by chandleries around the bay and the Lakes, and antifouling for alloy hulls must be free of copper, with suitable products available from marine coating brands. When comparing quotes, ask which filler wire suits your hull and whether the repairer has worked on your brand before. Ask how the repaired area will be finished, especially on painted hulls. And for older boats, ask whether replacement plate can be matched in thickness and alloy. Heavier electrical work on boats, such as new wiring and batteries, sits with marine electricians rather than welders, while shore power at home is the province of electrical services businesses.
| Ask Every Repairer | Why It Matters | A Good Answer |
|---|---|---|
| Do you weld boats regularly | Marine alloy needs experience | Yes, with examples |
| What caused the crack | It returns otherwise | Cause named, stiffening proposed |
| Which filler will you use | Marine alloys need the right wire | Specified for the hull alloy |
| How will fuel be managed | Vapour explosion risk | Drained, removed, gas freed |
| Will you check the trailer | Trailers cause hull damage | Yes, rollers and bunks assessed |
| What about the floor and foam | Hidden corrosion | Inspection offered before pricing |
Custom Fabrication and Fit Out
Alongside repairs, aluminium boat specialists build the fittings that make a boat work the way its owner fishes. Common projects include rod holders and rocket launchers, bait boards, casting decks, storage boxes, live bait tanks, ladders, grab rails, canopy and bimini frames, and extended transom platforms. Welding new fittings onto a hull adds load in places the original builder may not have reinforced, so spreader plates and backing pads matter. A well made bait board mount fails at the board, not at the hull, that is exactly how a fitting should be designed. Ask where the reinforcing sits and how it will look from inside the boat.
Owners upgrading boats for Port Phillip snapper fishing, Gippsland Lakes trips or Murray cod chasing often stage the work across a winter, doing repairs and fabrication together while the boat is off the water. Ask for a sketch with dimensions before fabrication starts, and consider how a new fitting affects weight distribution and where people stand. Stainless steel fittings on an alloy boat need isolation to prevent corrosion. Custom alloy work for sheds, trailers and vehicles is handled by the same shops, and general welding businesses can take on the steel parts of a project.
Repair Cost Against the Boat Value
There comes a point where a repair costs more than the boat is worth, and it helps to face that question early rather than after two rounds of work. Older pressed tinnies in the smaller sizes have modest resale values, so a floor replacement or transom rebuild can approach or exceed what the boat would sell for. Plate boats, larger hulls and well known brands hold value much better, and a major repair on a sound plate hull is often good economics. Consider the whole package, given that a boat with a tired motor, a rusted trailer and a wet floor needs three projects rather than one, and the total can approach the price of a newer rig. Set against that, a boat that fits the family, tows behind the current car and fishes the water you actually use has value beyond its market price. Ask the repairer for a frank view of the hull's overall condition, including anything likely to need attention in the next few years. Get the repair quote, then look at what similar boats sell for in Victoria, and compare. Staging the work over two seasons is sometimes the answer, doing the safety critical items first. Where the decision is to sell and upgrade, having the boat tidy and any small repairs done usually returns more than it costs, and a handyman can help with the odd jobs around the trailer and storage area.
Checking a Used Boat Before You Buy
Victoria has a large second hand market in aluminium boats, and an hour spent checking a hull before handing over money saves buyers from inheriting somebody else's repair bill. Start with the trailer, as a boat that has spent its life poorly supported will show it. Look along the hull from a low angle in good light, where dents, ripples and previous repairs stand out, and pay attention to lines of marks that match the roller positions. Inside, press the floor in several places, lift any inspection hatches and look for water, staining or white powdery corrosion in the bilge. Check the transom by leaning on the motor and watching for flex, and look for cracks around the mounting bolts and water stains inside the splash well.
Ask direct questions about repairs. A seller who can produce invoices and photographs for past welding is offering exactly the reassurance a buyer needs, while vague answers about a hull that has obviously been worked on deserve more scrutiny. Check that the Australian Builders Plate is present and that the motor fitted is within its ratings, as an overpowered boat is both a safety and an insurance problem. Look at the anodes, which tell you how well the previous owner maintained it, and check the registration details match the hull. For anything beyond a small tinny, paying a marine repairer for a pre purchase inspection is money well spent, particularly on boats over about fifteen years old where underfloor corrosion is common. Where the boat will live at home, check that the trailer fits the driveway and gate before buying, since paving and driveway changes cost more than most people expect.
Regional Considerations Across Victoria
Melbourne's bayside and south eastern suburbs hold the largest concentration of trailer boats, with ramps at Mordialloc, Patterson River, Frankston, Mornington, Sorrento and Queenscliff busy every weekend through the warmer months. Marine repairers cluster near those areas and around the industrial suburbs of Dandenong South, Seaford and Carrum Downs. Geelong and the Bellarine serve Corio Bay and the western side of Port Phillip. Western Port has its own ramps and repairers around Hastings, Stony Point and Phillip Island.
Gippsland supports a substantial fleet around the Lakes, Paynesville, Metung and Lakes Entrance, with repairers used to bar crossing damage. The far east at Mallacoota and the west at Apollo Bay, Port Fairy and Portland serve smaller local fleets, and owners there sometimes travel for specialist work. Inland, Eildon, Hume, Nagambie and the Murray towns from Echuca to Mildura keep freshwater boats and houseboats busy, with pontoon repairs a regular job, and booking hull work in winter usually means shorter waits than the spring rush before the snapper season. Boats stored in home sheds over winter need dry, level space, and shed and garage construction or shed builders can provide it. A shed also keeps the trailer out of the weather, which slows the rust that ruins galvanized frames.
| Area | Typical Boats | Common Damage |
|---|---|---|
| Port Phillip bayside | Plate boats and tinnies | Fatigue from short chop |
| Port Phillip Heads | Offshore plate boats | Heavy pounding loads |
| Western Port | Shallow water tinnies | Grounding and keel wear |
| Gippsland Lakes | Mixed fleet, bar crossers | Bar crossing fatigue |
| West coast ports | Offshore boats | Bass Strait swell loads |
| Murray and lakes | Freshwater boats, pontoons | Beaching and timber strikes |
| Item | Cost | Note |
|---|---|---|
| Small hull crack | $300 - $900 | Access dependent |
| Larger crack with plate | $600 - $1,700 | Stiffening included |
| Rivet repairs | $250 - $900 | Reseal or replace |
| Transom rebuild | $1,500 - $6,000 | Motor removal needed |
| Floor and foam | $1,500 - $5,000 | Corrosion may add |
| Fittings and rails | $250 - $1,200 | Spreader plates used |
A Winter Check Before the Season Starts
Victorian boating peaks from spring through summer, so winter is the sensible time to find problems and book repairs while workshops still have space.
Start with the boat off the trailer or at least with the bungs out and the bilge dry. Walk around the hull looking for dents, scrapes, dark lines that might be hairline cracks, and white powdery corrosion around fittings and fasteners. Run a hand along the keel and chines, which take the worst of beaching and ramp contact. Check the transom for cracks around the motor mounts, water staining and any flex when the motor is moved. Inside, press the floor in several places for softness, look into any inspection hatches, and check the bilge for water that should not be there. Look at the anodes and replace any that are heavily consumed, since a set of anodes costs far less than the corrosion repairs they prevent. Check fuel lines, filters and tank fittings for weeping or corrosion. On the trailer, check rollers, bunks, rubbers, the winch and the bow stop alignment, and look at the frame for rust. Note anything you find, photograph it and get quotes before the spring rush. Owners who do this each winter rarely lose fishing days to repairs. Storing the boat under cover through winter reduces most of this damage, and carport and garage construction can add covered space where a shed is impractical.
What Boat Welding Repairs Cost in Victoria
Small hull cracks and split seams typically cost $300 to $900 to repair, and larger cracks needing a backing plate $600 to $1,700. Access is the main variable, as a crack under a floor or behind a tank costs far more to reach than one on an open hull side. Leaking rivets are usually resealed or replaced for $250 to $900 depending on how many are involved. Keel strips and skid repairs run $400 to $1,200.
Transom repairs and rebuilds commonly cost $1,500 to $6,000, and floor and underfloor foam replacement $1,500 to $5,000, with more where corrosion has gone through the plate. Rod holders, rails and bait board mounts run $250 to $1,200 fitted. Fuel tank work is quoted separately by specialists after gas freeing. Rates for general alloy fabrication sit within the ranges for aluminium welding across the state.
What to Look Out For
Choose a repairer who works on boats regularly instead of a general welder taking on an unfamiliar job. Ask what caused the damage and how the repair prevents it returning. Never allow welding near a fuel tank that has not been drained and gas freed by someone competent to do it. Be cautious of quotes for floor work given without an inspection, since hidden corrosion changes the scope.
Check that the repair suits the boat's builders plate ratings, particularly when repowering. Ask about isolation of stainless fittings to prevent corrosion returning. Keep the invoice and photographs with the boat's papers for insurance and resale. Where a dispute over the work cannot be settled with the repairer, VCAT can hear consumer claims.
How to Get Useful Quotes
Give the make, model, year and hull type, and say whether the boat is riveted or welded. Clear daylight photos of the damage from a few angles, and one of the whole boat, help the repairer judge the job. Describe how and where the boat is used, including any bar crossings or beaching. Say whether the boat can be brought to a workshop on its trailer or needs to be worked on at a mooring.
Mention any previous repairs, since old welds and patches change the approach. Say whether a fuel tank sits near the damage and whether the boat is used commercially. Ask each repairer to state the process, filler, preparation, refinishing and warranty in writing. Trailer problems found during the inspection can be quoted at the same time through trailer welding repairs.
Aluminium Boat Repairs Across Victoria
We connect boat owners with aluminium repairers across Victoria for hull cracks, leaking rivets, transoms, floors, corrosion and custom fittings, from the bayside ramps at Mordialloc, Patterson River, Frankston, Mornington and Sorrento, through Queenscliff, Geelong and Western Port, out to the Gippsland Lakes, Mallacoota, the west coast ports and the inland lakes and Murray towns.
▶ Inner Melbourne 20 areas
Inner North
Inner East
Inner South
▶ Greater Melbourne 17 areas
Eastern Suburbs
South East
▶ North & West 20 areas
Northern Suburbs
Western Suburbs
▶ Bayside & Peninsula 20 areas
Bayside
Mornington Peninsula
▶ Geelong & Surf Coast 19 areas
Geelong
Bellarine Peninsula
Surf Coast
▶ Gippsland 18 areas
Bass Coast
West Gippsland
Latrobe Valley
East Gippsland
▶ Yarra Valley & Ranges 16 areas
Yarra Valley
Dandenong Ranges
▶ Regional Victoria 35 areas
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Aluminium Boat Repair FAQs - VIC 2026
What do aluminium boat repairs cost in Victoria?
Small hull cracks usually cost $300 to $900 and larger cracks $600 to $1,700. Transom repairs run $1,500 to $6,000, floor and foam replacement $1,500 to $5,000, and leaking rivets $250 to $900.
Can a riveted tinny be welded?
Sometimes, but welding near rivet lines on thin sheet can buckle the panel and loosen nearby rivets. Repairers often reseal or replace rivets instead, and weld only where the metal suits it.
Why does my hull keep cracking in the same place?
The hull is flexing more than the structure can take, usually from pounding, a heavy motor or poor trailer support. The repair needs extra framing or a doubler, not just another weld.
Is it safe to weld near a fuel tank?
Not until the tank has been drained, ideally removed, and properly gas freed with testing to confirm the atmosphere is safe. Petrol vapour can explode from a spark or conducted heat.
What causes white powder around my fittings?
Galvanic corrosion, where aluminium touches stainless, bronze or copper with salt water present. Isolating fasteners with nylon washers and compound, and keeping anodes fresh, prevents most of it.
How often should anodes be replaced?
Check them each season and replace when about half consumed. An anode that is fully spent gives no protection, and corrosion then attacks the hull and outboard instead.
Why is the floor soft in my old boat?
Water has usually saturated the underfloor foam, which then holds moisture against the hull and drives corrosion from the inside. Investigating means lifting the floor, so repairers quote an inspection first.
Can I fit a bigger outboard after a transom rebuild?
Only up to the maximum power and weight shown on the Australian Builders Plate. Exceeding it affects safety and may affect insurance, and the transom design should follow the original builder's intent.
Does my trailer damage the boat?
It can. Unevenly adjusted rollers, worn rubbers and a misaligned bow stop concentrate loads on small areas of hull, which shows as dents and stress lines matching the roller positions.
Do I need paperwork for a repair?
Recreational repairs need no approval, though keeping invoices and photos helps with insurance and resale. Commercial vessels in survey generally need the surveyor involved before and after structural work.
Can repairs be done at the ramp or a mooring?
Small fittings and rails sometimes, but hull, transom and floor work belongs in a workshop where the boat can be dried, supported and welded properly.
What is the best time of year to book?
Winter. Victorian marine workshops fill up from spring onwards as the snapper season and holidays approach, so waits are shorter in the colder months.
Boat, Trailer and Storage Specialists - VIC
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Get Boat Repair QuotesAbout This Guide
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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Reviewed by The Quote Yard Editorial Team
How The Quote Yard Works
We connect you with independent local tradies and service providers, we don't perform any trade work ourselves. Tradies provide their own quotes directly to you. Always confirm licensing, insurance, and scope of work before engaging any provider.
All Victorian tradies are required to hold appropriate licences. Verify at the Building and Plumbing Commission.
Figures are indicative 2026 VIC estimates and vary with the hull type, hidden damage under the floor, fuel tanks, paint and survey requirements. Get a written quote after an inspection, and check current Victorian marine safety requirements before relying on any figure.