A metal roof replacement in Sydney is priced per square metre of roof area, supplied and installed, and the total moves on five things: the profile you choose, whether the old roof is tile or metal, how complex the roof shape is, how hard the site is to access, and what the battens and insulation underneath turn out to be once the old roof comes off.
That last point is why quotes vary so much. Nobody can price a re-roof properly from the street.
If you are still deciding whether replacement is the right call at all, start with how to tell when a roof actually needs replacing, then come back here for the numbers.
What am I actually paying for?
A roofing quote that says “re-roof, $X” is hiding the work. A complete metal roof replacement includes:
- Stripping and disposing of the existing roof covering, including tipping fees
- Inspecting and, where needed, replacing battens, purlins or timber that has rotted
- Sarking or a vapour-permeable membrane
- New sheeting in your chosen profile, cut and laid
- Flashings, ridge capping, barge capping, valleys and penetration flashings
- Gutters and downpipes if they are being replaced at the same time
- Scaffolding, edge protection and a safe work method statement
- Site clean-up and magnet sweep for offcuts and fixings
The sheeting itself is rarely the biggest line. Labour, access, flashing detail and the unknowns under the old roof usually are. On residential metal roofing jobs, the flashing and detail work around chimneys, dormers, skylights and box gutters is where the hours go.
Why is a tile to metal conversion priced differently?
Two reasons.
First, tiles have to come off and go somewhere. That is a separate labour and disposal cost that a metal-to-metal re-roof does not carry (PLACEHOLDER: tile removal and disposal rate).
Second, a tiled roof is built on battens spaced for tiles. Metal sheeting needs different batten spacing and often needs the batten layout changed or replaced outright. On a tile-to-metal conversion this is normal, not an upsell, and any quote that does not mention battens has either allowed for it silently or has not thought about it.
The upside is weight. Concrete tile roofs are heavy. Steel sheeting is a fraction of that, which is why tile-to-metal conversions come up so often on older Sydney homes where the frame has been carrying tiles for decades.
Which profile should I choose, and what does the choice cost me?
Profile is the single biggest lever you control.
Corrugated Colorbond. The default. Widest availability, fastest to lay, lowest cost per square metre. Suits most standard pitched roofs.
Concealed-fix trapezoidal profiles (Speed Deck, Longline 305). No exposed fixings through the sheet, which removes the most common long-term leak path. They handle long runs and low pitches that corrugated cannot, and they look flatter and more architectural. Dearer than corrugated in both material and labour. Austek used Speed Deck on a Speed Deck re-roof in Randwick where box guttering and dormer integration drove the detail.
Standing seam. The premium end, in steel, aluminium or copper. Seams are mechanically or snap-locked rather than screwed, panels are often roll-formed to length on site, and curved or tapered work is possible. It costs more because it takes longer and demands a higher skill level, as a multi-level standing seam project in Balgowlah shows.
Copper and zinc. Specified for heritage and architectural work. Material cost is in a different bracket and moves with commodity prices, so a copper quote has a shorter validity period than a Colorbond one.
PLACEHOLDER: per-square-metre range for each of the five profiles above.
What makes one Sydney roof cost more than the identical roof next door?
Access. A single-storey house with a driveway and side gate is cheap to work on. A terrace on a narrow street with no off-street parking, where every sheet is carried through the house or craned over, is not. Inner-city and Eastern Suburbs jobs carry an access premium for exactly this reason.
Pitch and complexity. A simple gable roof with two planes is quick. A roof with six planes, three valleys, two dormers, a chimney and a box gutter has the same square metreage and several times the flashing work. Complexity is measured in metres of flashing, not square metres of sheet.
Height and edge protection. Two-storey and above means more scaffolding, and scaffolding is hired by the week. A job that runs an extra week carries an extra week of scaffold hire.
What is underneath. Rotten battens, failed sarking, old insulation, or in pre-1990 buildings, bonded asbestos sheeting. Asbestos changes the job entirely: it is licensed removal work with its own disposal chain and cannot be absorbed into a roofing rate (PLACEHOLDER: state whether Austek holds a licence or engages a licensed removalist).
Coastal exposure. If the property sits in a high-corrosivity marine zone, the specification changes. Different substrate, different fixings, different flashing metal. Mixing metals on a coastal roof causes galvanic corrosion and shortens the life of the cheaper metal. This is a specification decision made before the quote, not a variation discovered later.
What gets added on top?
These are the items that turn an accepted quote into a bigger final invoice when they are not discussed up front:
- Gutters, downpipes and box gutters. Often at end of life at the same time as the roof. Replacing them while the scaffold is up is far cheaper than coming back.
- Insulation. Blanket, foil or a rigid board system, specified to meet the thermal requirements that apply to the work.
- Solar. If panels are coming off and going back on, that is a coordinated trade. Planning solar roofing into the re-roof rather than after it avoids paying for the same access twice.
- Roof safety. For commercial and many strata buildings, anchor points, static lines or walkways are a compliance requirement, not an option. See height safety systems.
- Skylights and whirlybirds. Old units are usually not worth reinstalling.
Is commercial roofing priced the same way?
No. Commercial roofing is quoted per square metre too, but the drivers are different: large low-pitch areas, long sheet runs, plant and services penetrations to flash around, staged works to keep the building operating, and often night or weekend access. The per-square-metre rate on a large simple warehouse roof is usually lower than a complex home; the total is far higher because the area is.
Can I repair instead of replace?
Sometimes, and an honest roofer will tell you so. If the sheeting is sound and the failure is at flashings, fixings or gutters, targeted roof repairs and maintenance is the cheaper and correct answer.
Replacement becomes the better value when the coating has failed across the whole roof, when corrosion has gone through the sheet in multiple places, when fixings have backed out across large areas, or when you are about to spend money on solar, insulation or a renovation that would be wasted under a roof with a few years left in it.
How do I compare three quotes properly?
Ask every roofer for the same five things and the cheapest quote often stops being the cheapest:
- The exact profile, brand, substrate and colour, in writing.
- Whether battens, sarking and flashings are included or provisional.
- What happens if rotten timber or asbestos is found, and at what rate.
- The workmanship warranty in years, separate from the material warranty.
- The NSW builder or contractor licence number and current public liability cover.
A quote that is materially cheaper than the others has usually left something out of that list.
Frequently asked questions
How long does a metal roof replacement take? Most standard single-storey homes are a matter of days rather than weeks once scaffolding is up, with complexity and weather the main variables (PLACEHOLDER: typical days on site). Commercial jobs are staged around the building’s operations.
Do I need council approval to replace a roof in Sydney? Like-for-like replacement is generally treated as maintenance. Changing profile, colour or roof form can trigger controls, particularly in heritage conservation areas and under some council development control plans. Confirm with your council before you commit to a colour or profile change.
Will a metal roof make the house hotter or noisier? Both concerns are handled by what goes under the sheet. Sarking plus insulation deals with heat and with rain noise. A roof installed without them will be hotter and louder than one installed with them.
Can you re-roof over the existing tiles? Overlaying is not a substitute for a proper strip and re-roof. It hides the condition of the structure underneath, which is the part you most need to see.
How long should a metal roof last in Sydney? It depends far more on the corrosivity of the location and the quality of the flashing detail than on the brand of sheet. Inland suburbs and sheltered coastal sites behave very differently from properties exposed to breaking surf.
Get a real number for your roof
Square-metre ranges are useful for budgeting and useless for deciding. The only way to price a re-roof accurately is to get on the roof, measure it, and look at what is under the sheets.
Austek has been re-roofing Sydney homes and buildings since 2010, in Colorbond, Speed Deck, Longline 305, standing seam and copper. You can see the detail on completed Sydney projects.
Tell us your suburb and roof type and we will come and measure it. Request a site measure and quote, or call 0411 922 441.
