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Roof Cost Calculator (Australia)

Estimate the full installed cost of a roof replacement in Australia in 2026: Colorbond steel, concrete tile, terracotta tile, slate, and zincalume — itemised by material, labour, strip-off, skip, and BCA compliance.

Roof Cost Calculator

Estimate the full installed cost of a sloped-roof replacement, broken down by material, labour, tear-off, disposal, underlay, and gutters. Currency and pricing are matched to your selected locale.

Total installed cost
$15,307
$139/m² · 110 m² total
Annualised over 50-year service life: $306/yr (Concrete tile)
Material
$3,353
Labour
$7,229
Tear-off
$1,889
Disposal
$1,433
Underlay
$908
Gutters
$0
Permit + misc
$495
Slope factor
1.122

What this calculator does

This calculator gives you a full installed-cost estimate for replacing a sloped roof in Australia. It accounts for:

  • Material — Colorbond steel, zincalume, concrete tiles, terracotta tiles, slate, cedar shingle, and membrane systems
  • Labour — adjusted for pitch and roof complexity per AS 1684 framing standards
  • Strip-off — single layer or strip back to rafters
  • Skip hire and disposal — concrete and terracotta cost more to dispose of due to weight
  • Sarking — Class A1 anti-condensation breather membrane (now mandatory in most BCA climate zones)
  • Gutters and downpipes — optional, by linear metre
  • Council fees and miscellaneous — typically 3% of subtotal, minimum $450

How to use it

  1. Get the roof area — measure each plane’s slope-adjusted area in m². Use our roof square footage calculator to convert footprint to slope area.
  2. Set the pitch — Australian pitched roofs typically run 15°–25° (3.2/12 to 5.4/12) for tiles and 5°–25° for sheet metal. Lower pitches need higher-grade waterproofing.
  3. Pick a material — Colorbond Custom Orb or Trimdek is the dominant new-build choice (about 60% of Australian residential market per Master Builders 2026). Concrete tile (Bristile, Boral) for traditional homes. Terracotta (Wunderlich, Monier) for character homes.
  4. Region — Sydney and Melbourne metro: 15–22% above national. Brisbane, Perth: 5–10% above national. Adelaide, Hobart: at average. Regional NSW/VIC/QLD: 10–18% below. Cyclone-prone north: add 8–15% for cyclone-rated fixings (AS 1170.2 wind classification N4 to C4).
  5. Complexity — simple gable or skillion: “simple”. Hip roof or one or two dormers: “moderate”. Multiple gables, hips, valleys, ornate trim: “complex” — adds 12–28% labour.
  6. Strip-off, sarking, gutters — toggle and quantify.

Typical 2026 installed cost ranges (Mid-cost region, 200 m² home)

Material$/m² installedTotal cost (200 m²)Service life
Colorbond Custom Orb$90–$135$18,000–$27,00035+ yrs
Colorbond Trimdek$95–$140$19,000–$28,00035+ yrs
Zincalume (uncoated steel)$75–$110$15,000–$22,00025+ yrs
Concrete tile (Bristile, Boral)$75–$110$15,000–$22,00050+ yrs
Terracotta tile (Monier, Wunderlich)$130–$180$26,000–$36,00075+ yrs
Slate$220–$320$44,000–$64,000100+ yrs
Cedar shingle$145–$210$29,000–$42,00030 yrs
Membrane (TPO/EPDM)$95–$155$19,000–$31,00022 yrs

Sources: hipages 2026 trade pricing data; Master Builders Australia Q1 2026 cost survey; BlueScope Steel Colorbond pricing 2026; Bristile Roofing, Boral, Monier published trade pricing; Australian Roofing Contractors Association regional rates.

Cost drivers in detail

Roof size. Linear scaling per m², but small jobs under 60 m² (extension, granny flat) carry a $2,500–$4,000 mobilisation premium for scaffolding, skip, and crew transport.

Pitch. A 15° (3.2/12) pitch is the typical Australian house — labour multiplier 1.0. A 25° (5.4/12) pitch needs roof safety mesh — multiplier 1.08. A 35° (8.4/12) pitch on a Federation home requires harnesses — multiplier 1.22. Steel-deck minimum pitch is 5° (1/12); tile minimum is 15° (3.2/12).

Strip-off. Single layer of Colorbond: $9–$14 per m². Concrete tiles: $12–$18 per m² (heavier, slower). Asbestos cement (banned 1987 but still on many older roofs): licensed removal at $65–$110 per m².

Region. Sydney and Melbourne metro: 15–22% above national average. Cyclone zones (Cairns, Townsville, Darwin, Broome): add 8–15% for AS 1170.2 cyclone-rated fixings and additional structural ties.

Roof complexity. Simple skillion or gable: 3–5 days. Hip roof with valleys: 5–8 days. Federation or Victorian home with multiple gables, finials, and decorative ridge detailing: 8–12 days.

Sarking requirement. The 2022 NCC (BCA) update made anti-condensation Class A1 sarking mandatory in NCC climate zones 6, 7, and 8 (Melbourne, Hobart, Canberra, alpine). Adds $8–$14 per m². Optional but recommended in zones 1–5.

Cyclone classification. Homes in Cyclone Areas (Wind Classification C1–C4 under AS 1170.2) require certified tie-down straps, oversized batten fixings, and storm-rated screws. Adds $12–$22 per m² to a Colorbond build.

BAL rating. In a designated Bushfire Prone Area, AS 3959 requirements apply. BAL-12.5 to BAL-19: no extra cost (Colorbond and tiles already comply). BAL-29: $15–$25 per m² for sealed eaves and ember mesh. BAL-40 and BAL-FZ: $30–$60 per m² for full Class A1 underlay and bushfire shutters.

Colorbond vs tiles — the Australian choice

Colorbond steel sheeting is the dominant choice on new builds and replacements in 2026. Approximately 60% of Australian residential roofs are now metal. Lighter weight (no need for over-engineered roof framing), faster install (3–5 days vs 6–10 for tiles), 35+ year service life, BlueScope’s 22-colour palette includes the popular Surfmist, Monument, Basalt, and Woodland Grey. Best for: new builds, contemporary renovations, fire-zone properties (Class A1 non-combustible), cyclone areas (correctly fixed steel outperforms tiles in extreme wind).

Concrete tiles (Bristile Designer, Boral Slimline, CSR PGH) are the affordable traditional choice. 50+ year life with re-bedding every 10–15 years. Heavier — needs proper structural support per AS 1684. Best for: budget builds in non-cyclone areas, replacements where the home was originally tiled, neighbourhoods with HOA tile requirements.

Terracotta tiles (Monier, Wunderlich, Bristile Wisteria) are premium — natural clay, beautiful colour-fastness for 75+ years, used heavily on Federation, Californian Bungalow, and Mediterranean-style homes. 2x the cost of concrete tile. Best for: heritage properties, character homes, owners staying long-term.

Slate is rare in Australia outside high-end Tasmanian and Western Australian heritage homes. Sourced from Welsh, Spanish, or Brazilian quarries. 100+ year life. Most expensive option.

Cedar shingle is rarely used in Australian residential — limited to alpine architectural projects. Banned in many BAL zones.

Common gotchas that blow the budget

Asbestos-cement super six. Many pre-1987 Australian homes have asbestos-cement corrugated sheeting (“super six”) on garages, sheds, and sometimes the main house. Licensed removal under the Work Health and Safety Regulations is mandatory — $65–$110 per m². Air monitoring and clearance certificate add $400–$1,200.

Rotten battens. Australian timber battens fail fast in coastal and humid climates. Once stripped, expect 8–20% of battens to need replacement — $4–$8 per m². Convert to steel battens (Stratco, Pryda) for $9–$14 per m² extra and a 50+ year life.

Sarking missing. Older Australian roofs (pre-2000) often have no sarking. Adding it during the re-roof is $8–$14 per m² for Class A1 anti-condensation breather membrane, and pays back quickly in cooling load reduction.

Insulation upgrade. Many older homes have R1.5 or R2.0 ceiling insulation. Upgrading to NCC 2022 minimum R5.0 in climate zones 5–8 adds $14–$22 per m² when batts are blown in from the roof side during the re-roof.

Skylight and solar PV re-fix. Skylights typically need replacing if they’re 20+ years old — $400–$900 each installed. Solar PV systems must be removed and reinstalled by a CEC-accredited electrician — $1,200–$2,200 for a typical 6.6 kW system.

Whirly birds and roof vents. Old whirly birds rarely seal back into a new metal roof — replace them with wind-driven roof vents at $250–$450 each. Required for adequate roof space ventilation per AS 4859.2.

When to repair vs replace

Repair makes sense if:

  • The roof is under 60% of its expected service life
  • Damage is localised (a few cracked tiles, one valley, one fixing line)
  • The sarking and battens are sound elsewhere
  • Mortar bedding on ridges can be re-pointed (not full replacement)

Replace if:

  • The roof is past 75% of expected life
  • More than 15% of the field has issues (cracks, slipped tiles, perforated steel)
  • Multiple leaks across non-adjacent areas
  • Multiple repair attempts haven’t held
  • You’re planning to install solar PV soon (re-roof first)

Sources: National Construction Code (NCC) 2022 Volume 2; Australian Standard AS 1562.1 (Design and installation of sheet roof and wall cladding); AS 2050 (Installation of roof tiles); AS 3959 (Construction of buildings in bushfire-prone areas); AS 1170.2 (Wind actions); BlueScope Steel Colorbond technical specifications; Master Builders Australia Q1 2026 cost survey; hipages 2026 trade pricing data; Australian Roofing Contractors Association regional cost data.

Frequently asked questions

How much does a new roof cost in Australia in 2026?
Replacing a roof on a typical 200 m² Australian home costs $14,500 to $24,000 in Colorbond steel sheeting, $11,500 to $19,500 in concrete tiles, and $18,000 to $30,000 in terracotta tiles in 2026. Labour rates are $85–$120 per m² in Sydney and Melbourne. Brisbane and Perth run 8–12% lower; regional Australia can be 15–25% lower outside cyclone zones. Source: hipages 2026 trade pricing + Master Builders Australia member survey Q1 2026.
Is Colorbond cheaper than tiles in Australia?
On materials alone, Colorbond steel is cheaper than terracotta tiles but slightly dearer than concrete tiles. The bigger difference is in installation speed — a Colorbond re-roof on a 200 m² home takes 3–5 days, whereas tiles take 6–10 days. Total installed: Colorbond $90–$135 per m² vs concrete tile $75–$110 per m² vs terracotta $130–$180 per m². Colorbond also needs no maintenance for 30+ years, while tiled roofs require re-pointing every 10–15 years.
What's the BAL rating and how does it affect cost?
Bushfire Attack Level (BAL) is the rating under AS 3959 that determines what materials and detailing your roof must use in a designated Bushfire Prone Area. BAL-12.5 and BAL-19 require non-combustible coverings (steel, terracotta, concrete tile) — most Australian homes meet this with standard products. BAL-29, BAL-40, and BAL-FZ require sealed eaves, ember-mesh gutters, and specific Class A1 fire-rated underlay — adding $15–$45 per m² to the build.
Do I need development approval for a re-roof?
A like-for-like re-roof (same material, same colour, same profile) is generally exempt under most NSW SEPP, Victorian VPP, and Queensland exempt development categories. Changing roof material — especially tile to Colorbond — usually requires a building approval (DA) in heritage zones, conservation areas, and some councils' character overlays. Always check with your local council before starting. Heritage-listed dwellings need a Heritage Impact Statement.
How long does a Colorbond roof last in Australia?
BlueScope warrants Colorbond for 25 years against perforation and 15 years against discolouration in Mild and Moderate environments (most of Australia). In Severe environments (within 1 km of breaking surf, industrial pollution areas), the warranty drops to 12 years. In practice, a properly fixed Colorbond roof lasts 35–50 years. The fixings (Class 4 valley flashing, Type 17 screws with neoprene washers) typically need replacing once during that life — every 20–25 years.
Will my home and contents insurance cover a roof replacement?
Insurance covers roof replacement only when damage is from a covered event — storm, hail, falling tree, fire. Wear and tear, age-related failure, and gradual leaks are excluded. After major hailstorms (Sydney 1999, Brisbane 2014, Sydney 2018), insurers approved tens of thousands of full replacements. For routine claims on roofs over 20 years old, ICA member insurers depreciate heavily under indemnity-value policies. Take a Sum Insured / Replacement Cost policy if you want full cover.
Do I need scaffolding or fall protection?
Yes. Safe Work Australia's Code of Practice for Managing the Risk of Falls at Workplaces requires fall protection (scaffolding, harness with anchor, or roof edge protection) for any roof work over 2 metres. WorkSafe ramped up enforcement in 2024 — non-compliant work attracts $30,000+ fines. Scaffolding hire for a typical Australian home is $1,200–$2,400 for the duration of the job.
Should I re-bed and re-point my tile roof instead of replacing?
If the tiles are sound (no cracks, no slip, manufacturer's profile is still made), re-bed and re-point the ridges, valleys, and hips for $35–$60 per m of mortar. This buys 10–15 more years. A full strip-and-relay (same tiles, new sarking and battens) costs $55–$80 per m². A complete re-roof in new tiles starts at $85 per m². Re-bedding is a fraction of the cost and is worth the inspection — get a roof report first.

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