Roof Repair
Roof Repair near you
Most Australian roof repairs are one of three jobs: stopping a leak, arresting corrosion, or putting right ridge and hip capping that has let go. The covering is usually prepainted or metallic coated steel sheet, or concrete or terracotta tile, and each fails in its own way. Sheet roofs go at the fasteners, the laps and the cut edges. Tile roofs go at the mortar, the flashings, and the tiles that have crept, cracked or been stood on. A repair earns its keep when the covering still has service left in it and the fault is local.
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Diagnosis is most of what you are paying for. Water rarely enters a roof directly above the stain on your ceiling: it lands on sarking or a batten and runs downhill until it finds a fixing, a lap or a penetration to drop through. That is why a mark above a bedroom window can begin at a valley several metres away, and why anyone who reaches for the sealant gun before tracing the path is guessing with your money.
Who may carry out the repair is decided by your state, not nationally. New South Wales treats roof plumbing as its own licence class, defined as fixing, installing, renovating, altering, repairing and maintaining guttering, downpipes, roof flashing and roof coverings, and requires a contractor licence once residential work passes the value threshold in the Home Building Act. Queensland licenses roof tiling separately from roof and wall cladding through the QBCC. Ask which class covers your particular repair before anyone climbs up.
Signs a roof needs repair now rather than watching
- A ceiling stain that grows after every storm but stays dry in between, which points at a joint, a lap or a flashing rather than a hole.
- Screw heads standing proud of the sheet, or sealing washers that have perished and split, letting water track down the shank.
- Rust beginning at cut edges, at drill swarf left behind by an earlier job, or exactly where somebody has walked across a lap.
- Pointing on ridge and hip capping that crumbles when you rub it, or capping that rocks under hand pressure.
- Tiles that have crept down the batten and opened the headlap, so wind-driven rain gets in behind the course above.
- Flashings at a chimney, skylight, whirlybird or solar penetration that have lifted, with the sealant cracked and shrunk back from the metal.
- A valley rusted through at its lower end, or packed with leaf litter that holds water against the metal for days after rain.
What actually causes leaks on Australian metal and tile roofs
On sheet roofs, the usual culprits are laps, flashings and fasteners rather than the sheet itself. The ABCB Housing Provisions set a minimum end lap of 150 millimetres on steeper slopes and 200 millimetres on gentler ones, and require flashings to be purpose made, machine-folded sheet metal sections compatible with the roof covering both upstream and downstream of them. Metal sheet roofing has to carry a metallic coating to AS 1397, with the coating class chosen for the corrosion environment, so a roof installed with an inland specification a few streets back from the surf will rust years early no matter how well it was fixed.
Dissimilar metals cause failures that look inexplicable from the ground. The Housing Provisions prohibit lead materials upstream of aluminium and zinc coated materials, and copper materials upstream of galvanised coatings, because runoff carries the more noble metal downhill onto the less noble one and eats it. An old lead flashing, a copper pipe or a copper hot water overflow discharging onto a modern coated steel roof will bore a hole through it, and replacing the sheet without removing the source just restarts the clock.
On tile roofs the failures are mortar and underlay. Ridge and hip capping is bedded and pointed with a flexible pointing material to AS 2050, and rigid mortar that has gone brittle cracks and lets water into the bedding. Sarking to AS 4200.1 is required where the roof pitch falls below 18 degrees or where rafter and truss top chords exceed the specified lengths, and an anti-ponding device is required on roofs below 20 degrees or without an eave overhang. Fixing density is set by wind class: at N1 and N2 every full tile in the second course is fixed at the roof edges, and at N3 each tile in every second course, with ridge, hip, barge and valley tiles fixed individually.
Repair, roof restoration or replacement: three different products
Australian roofers sell three things that homeowners often confuse. A repair is targeted work on an identified fault. A roof restoration, which is heavily marketed here, typically means rebedding and repointing the capping, replacing broken tiles, high-pressure cleaning and applying a coating, or on metal, cleaning and recoating. A replacement strips the covering and starts again. A restoration can extend the life of a sound tile roof and tidy its appearance, but it is maintenance and cosmetics: it does not correct undersized guttering, a failed valley, a batten problem or a roof that no longer suits the wind classification of the site.
Repair stops making sense when corrosion is general rather than local, when the roof already carries several generations of patches and sealant, when battens or roof timbers have been wet long enough to soften, or when the same leak has been chased three times by three trades. It also stops making sense when the covering is asbestos cement, because there is no safe way to keep patching it.
Insist that the quote says which of the three you are buying, and what specifically is being repaired. A quote that says the roof will be restored, with no list of the faults found and no statement of what caused them, cannot be compared against a quote that says a valley will be replaced and two flashings reformed.
How a competent roof repair is carried out
Access comes first, and it is not a formality. Roof work is work at height, tile roofs and old fibre cement are fragile underfoot, and wet coated steel is genuinely slippery. A repairer who arrives with an extension ladder and no fall protection or roof access plan for a two storey house is telling you something about how the rest of the job will go.
Then the trace. The honest method is to work from the inside out: look in the roof space with a light for wet timber, stained sarking and daylight, identify the highest point of the wet trail, then test from outside with water starting low and moving progressively higher until it reproduces the leak. Testing everything at once tells you nothing. Once the entry point is found, the repair addresses the cause, not just the symptom, and reinstates the detail the way the standard requires rather than burying it in sealant.
Finally, the evidence. Ask for photographs before and after, taken close enough to show the actual defect, and for a plain-language note of what was found and what was done. On an insurance claim that file is what supports you, and on a recurring leak it is what stops the next tradesperson starting from zero.
Storm damage, make-safe work and pre-1990 asbestos
After severe weather the first visit should be a make-safe: temporary covering, securing loose sheets or capping, clearing what is blocking water, and stopping further entry. That is deliberately not the permanent repair, and it should not be priced or documented as one. Photograph everything from ground level before anything is moved or removed, because once the tarp is on, the evidence of what the storm did is underneath it.
Treat an older roof as an asbestos question until someone competent says otherwise. SafeWork NSW records asbestos cement in roofing, including the corrugated Super Six profile, and in guttering, downpipes, eaves, cover strips, flashings and fencing, typically installed from the 1940s through to the late 1980s. High-pressure water spray, jets, power tools and compressed air must never be used on it, which rules out the pressure-clean that a roof restoration normally begins with.
Removal is regulated by quantity and type. A licensed asbestos removalist is required for any amount of friable asbestos and for more than 10 square metres of non-friable, bonded material, and SafeWork NSW recommends using a licensed professional for any amount at all. A storm-damaged fibre cement roof is broken material, which is precisely the condition in which it stops being safely bonded.
Licences that cover roof repairs, and how to check one
The QBCC's licence classes show how finely this work is divided. Roof tiling covers cutting and fixing roof tiles of concrete, clay, metal or similar material, shingles and shakes to roof and fascia structures, setting out and fixing battens, bedding, pointing and installing associated flashing, installing safety mesh, sarking and anti-ponding boards, fixing firewall insulation and metal straps to battens, installing skylights, and refurbishing and maintaining roofs other than painting them. Roof and wall cladding is a different class covering roof cladding other than terracotta and concrete tiles, fabricating and installing rainwater goods, flashing penetrations through roofs and walls, and designing, fabricating and installing external flashings, soffits and fascias. A tiler and a cladding contractor are not interchangeable.
Elsewhere the pattern is the same but the names differ. Queensland requires a QBCC licence above its building work threshold and for plumbing and drainage of any value at all. New South Wales requires a contractor licence above the Home Building Act threshold, with substantial penalties for unlicensed work under that Act, and caps the deposit on both small and large jobs at 10 per cent of the contract price. Western Australia registers builders through the Building Services Board, supported by Building and Energy, under the Building Services (Registration) Act 2011, with thresholds that vary by building class. Victoria registers building practitioners and licenses plumbing work by class. Look the number up on the regulator's own register rather than trusting a logo on a quote.
LokalMatch sits at the front of that process. You describe the roof problem once, including the roof type, the number of storeys, where the water appears and when it started, and matched local repairers contact you directly. Those businesses pay for the requests they receive. LokalMatch does not repair roofs, does not set or quote prices, and does not vet, rank or recommend any business, so checking the licence class, the insurance and the references remains your job.
Making a roof repair last
- Clear valleys, gutters and behind parapets, because standing debris holds moisture against metal and is where the next corrosion hole starts.
- Have any new penetration, such as a solar mount, an antenna or an exhaust fan, flashed properly rather than sealed, since sealant alone is a temporary repair sold as a permanent one.
- Remove the source of any dissimilar metal runoff at the same time as the repair, not afterwards.
- Keep overhanging branches off the roof surface, as abrasion strips the coating and dropped litter feeds both corrosion and, on bushfire prone land, ember ignition.
- Look at the underside from inside the roof space after the first heavy rain following the work, which is the cheapest inspection available to you.
- Never pressure-clean a fibre cement roof, eaves lining or cover strip on an older home.
- Keep the repairer's photographs, scope and any product data sheets with your house records for the next claim or sale.
Roof Repair: frequently asked questions
How do I know whether my roof needs a repair or a full replacement?
Look at whether the faults are local or general. A single failed valley, a lifted flashing or a stretch of loose capping is a repair. Corrosion appearing across several areas at once, multiple layers of past patching, or soft roof timbers point to replacement. Ask the assessor to show you photographs of each fault and say what caused it, because a cause that will recur across the whole roof is the real signal.
Is a roof restoration the same as a repair?
No. A restoration is usually rebedding and repointing capping, replacing broken tiles, cleaning and coating. It is maintenance and appearance work. It will not fix undersized guttering, a corroded valley, a batten problem or poor flashing detail, so ask for the list of defects found and what is being done about each one before you accept a restoration as the answer to a leak.
Why does my roof only leak in certain storms?
Because wind direction and rain intensity change where water goes. A lap, a flashing upstand or a penetration that sheds ordinary rain will let water in when it is driven sideways or when the volume overwhelms it. That pattern is useful information: tell the repairer which wind direction produces the leak, as it narrows down which side of which detail to test first.
Can a leak be fixed with sealant?
Sometimes as a genuine temporary measure, rarely as the answer. Sealant is not a substitute for a correctly formed flashing, an adequate lap or a properly fixed sheet, and it fails under Australian ultraviolet exposure while looking fine from the ground. If a quote proposes sealing without saying what the water path is, ask what happens when the sealant perishes.
My roof might be asbestos cement. Can it still be repaired?
Get it identified first and do not let anyone clean or cut it in the meantime. Asbestos cement was widely used in roofing, guttering, downpipes, eaves and flashings from the 1940s to the late 1980s, and high-pressure water, power tools and compressed air must never be used on it. A licensed removalist is required for any friable material and for more than 10 square metres of bonded material, and using one for any amount is recommended.
Does a small roof repair need a licensed contractor?
It depends on the value and your state. Most jurisdictions require a licence above a set contract value, and several license roof plumbing or roof cladding as their own class regardless of how the job is described. In Queensland plumbing and drainage work needs a licence at any value. Check the licence class against the work on your state regulator's public register before agreeing to anything.
Sources
- NCC: ABCB Housing Provisions Part 7.2 Sheet roofing
- NCC: ABCB Housing Provisions Part 7.3 Roof tiles and shingles
- QBCC: Roof tiling licence
- QBCC: Roof and wall cladding licence
- QBCC: Who must hold a QBCC licence
- NSW Government: Roof plumbing work licences
- NSW Government: Guide to providing home building contracts
- SafeWork NSW: Asbestos
- Western Australian Government: Builders' registration
Written by the LokalMatch editorial team. Last reviewed 14 September 2026. How we write and check our guides
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What affects the cost of roof repair
Prices depend on the details of your project. We only publish price ranges when they’re backed by real LokalMatch quote data or reliable sources. Until then, here’s what usually changes the price:
- Roof size and the number of layers to remove
- Roofing material
- Slope and how steep the roof is to work on
- Access to the roof and the site
- Condition of the decking underneath
- Flashing, vents, skylights and chimneys to work around
- Amount of repair work compared with a full replacement
How to compare roofers before you hire
- Ask for a written quote that lists the materials, the scope of work and what happens if damaged decking is found once the old roof is off.
- Look for a roofer who inspects the roof in person, including the attic if possible, before giving you a price.
- Check that they carry liability insurance and workers' compensation coverage, since roof work is high-risk.
- Compare quotes on the same scope: tear-off or overlay, underlayment, flashing, vents and cleanup.
- Ask to see recent roofs they've done that are similar to yours in material and slope.
Questions to ask roofers before you hire
- Will you remove the old roofing or install over it, and why?
- How will you handle damaged decking or other surprises once the roof is open?
- Who will pull the permit if one is needed?
- Can you show me proof of liability insurance and workers' compensation coverage?
- What warranty do you offer on your workmanship, and how long does it last?
- How will you protect my yard, gutters and siding, and how will you clean up nails and debris?
- Will your own crew do the work, or will you use subcontractors?
When to call a pro for roof repair
- Water stains on ceilings or in the attic after rain or snowmelt
- Missing, curled or cracked shingles, or granules collecting in the gutters
- Sagging areas on the roof, which should be looked at by a professional right away
- Ice dams that keep forming along the edge of the roof
Roof repair permits and local rules
Some roof repair work needs a permit or has to meet local bylaws. Rules vary by municipality, so ask your pro whether a permit is needed and who will apply for it — and check with your city or town if you’re unsure.
Permits and licensingSeasonal maintenance
This job is part of our home maintenance checklists for:
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