Costs, Price Factors and 2026 Rules
Re-roofing vs roof restoration: when a restoration is enough and when it wastes money
How to tell whether a tiled or metal roof in Australia can be restored or needs replacing, with signs to check, illustrative costs and a worked ten-year comparison.
A roof restoration is worth doing when the roof covering and the structure underneath are basically sound and the problems are on the surface: worn ridge pointing, a few broken tiles, moss and lichen, faded colour or minor rust on fixings. Re-roofing is the better choice when tiles are porous or widely cracked, battens are rotten, steel sheets are rusted through, the roof leaks in several places, or the roof contains weathered asbestos. On this site's illustrative ranges, a restoration costs about $25–$60 per m² against $80–$220 per m² for a full re-roof, but a restoration on a failing roof often only postpones the bigger bill.
This guide is part of the roof replacement cost overview.
What a restoration usually includes
"Roof restoration" is not a defined term, so each contractor's package differs. A typical tile restoration includes some or all of:
- Pressure cleaning to remove dirt, moss and lichen
- Replacing broken or cracked tiles with matching ones where available
- Removing and re-bedding loose ridge and hip capping, then re-pointing it with flexible pointing compound
- Re-sealing or replacing valley irons and flashings
- Applying a primer and a membrane or paint coating
- Clearing gutters and checking downpipes
A metal roof restoration typically includes replacing rusted or loose screws, treating surface rust, re-sealing laps and flashings, and sometimes painting. Rusted-through sheets must be replaced.
Signs a restoration will work
| Check | Points to restoration | Points to re-roofing |
|---|---|---|
| Tiles | Mostly intact; a few broken | Many cracked, flaking, porous or soft |
| Battens | Firm, straight, no rot when inspected from the ceiling space | Sagging, rotten or split, fixings pulling out |
| Leaks | One or two leaks traced to ridges, valleys or flashings | Multiple leaks or water stains across the ceiling |
| Steel sheets | Surface rust, loose screws | Rust holes, lifting laps, rust along overlaps and gutters |
| Sarking | Present and intact, or not needed for the fix | Missing under a roof that needs condensation or ember protection |
| Roof line | Straight ridges and planes | Visible sagging or uneven planes |
A good contractor should show you photos of what they found, including in the ceiling space. If one contractor says restore and another says replace, ask each to explain the evidence. An independent building inspector can give a view without a sale attached.
What a restoration cannot fix
- Porous tiles. Old concrete tiles lose their surface and absorb water. A coating improves the look but does not restore the tile body.
- Rotten battens and rafters. Coating the tiles does nothing for timber underneath. Water that has been getting in for years may have damaged the frame.
- Missing sarking. You cannot add sarking under tiles without lifting them, which is close to a re-roof in labour.
- Asbestos cement sheets. Coating products are sold for asbestos roofs, but the work involves disturbing asbestos and may be restricted by your state. Many owners decide removal is the better long-term option.
Worked ten-year comparison (illustrative)
A 180 m² concrete tile roof is 45 years old. Some tiles are cracked and the ridges are loose. The owner plans to stay at least 15 years.
Option A: restore now, re-roof later. Restoration at an illustrative $45 per m²: 180 × 45 = $8,100, plus $1,500 fixed = $9,600. The contractor warns the tiles are near the end of their life. Assume the owner re-roofs in year 8 at $125 per m² plus $4,500: 180 × 125 + 4,500 = $27,000. Total over the period: $9,600 + $27,000 = $36,600 (ignoring price rises).
Option B: re-roof now. Tile to steel at $125 per m²: 180 × 125 = $22,500, plus $4,500 = $27,000.
On these assumptions, re-roofing now costs $9,600 less over the period. If, instead, the tiles were sound and the restored roof lasted the whole 15 years, option A would cost $9,600 against $27,000. The whole decision hinges on how long the restored roof will really last, which is why the inspection evidence matters more than the brochure.
Coatings and warranties
Restoration companies often promote long coating warranties. Before relying on one:
- Ask whether the warranty is from the coating manufacturer, the contractor or both, and get it in writing.
- Check what it covers: peeling and flaking of the coating usually, but not leaks from cracked tiles.
- Check conditions such as cleaning, inspections or approved applicators.
- Remember the contractor's statutory warranties under your state's building law still apply where the job is residential building work. See defective roof work and statutory warranties.
Licensing, insurance and deposits still apply
A restoration is still building work. In Queensland, for example, the QBCC lists restoring or repairing roofs as work requiring home warranty insurance where the project cost is over $3,300, and a licence is needed above that value. Other states set their own thresholds. See licence thresholds by state and home warranty insurance thresholds. Restorations are also a common door-to-door pitch after storms; see storm-chaser roofing scams.
Frequently asked questions
Does a roof coating stop leaks?
A coating is mainly a surface finish. Leaks usually come from broken tiles, failed ridge pointing, rusted valleys or poor flashings, and those need repair. A contractor who promises a coating alone will cure leaks should explain exactly how.
Can I restore a roof to sell the house?
Many owners do, because a restored roof photographs well. A buyer's building inspector may still note porous tiles or rotten battens, so a restoration does not hide a worn-out roof. Be honest in any disclosure your state requires.
How often does a restored tile roof need attention?
It depends on climate, tile condition and the products used. Ask the contractor for a maintenance schedule in writing and check gutters and ridges after major storms.
Is it cheaper to replace only the worst section?
Partial re-roofing can work, for example one damaged plane after a storm. Matching tiles or colours can be hard, and the junction must be flashed properly.
Sources
- Safe Work Australia — model Code of Practice on removing and managing asbestos
- Queensland Building and Construction Commission — insurable work including roof restoration and repair
- Consumer Affairs Victoria — getting quotes and dealing with tradespeople
- NSW Government building and renovating — Building Commission NSW guidance on contracts and licences
