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Roof Replacement Calculator

Plan a complete Australian roof replacement in 2026: strip, batten, sarking, Colorbond or terracotta, and full installed cost in A$/m² — itemized by line.

Roof Replacement Calculator

Plan the full replacement project: tear-off, disposal, decking allowance, code upgrades, crew duration, and total installed cost — all matched to your locale's currency and labour rates.

Estimated total replacement cost
$31,734
$172/m² · 22.3 squares · Concrete tile
Annualised over 50-year service life: $635/yr · Project duration: 1 day(s) on a 4-person crew
Material
$6,329
Labour
$13,646
Tear-off
$3,565
Disposal
$2,704
Underlay
$1,714
Deck repair
$949
Code upgrades
$1,902
Permit + misc
$924
Surface area
208 m²
slope factor 1.122
Crew time
3.3 man-days
1 day(s) wall-clock
Debris
9,124 kg
~24 cu yd skip

What this calculator does

This calculator estimates the full A$ cost of an Australian pitched roof replacement, itemised the way an MBA-member contractor’s quote should be:

  • Material — Colorbond sheeting or tiles, ridge cappings, flashings, sarking, battens, fasteners
  • Labour — adjusted for pitch, complexity, wind region, and material handling
  • Strip-off — single-layer existing tile or sheet
  • Disposal — skip and tip fees
  • Sarking and battens — AS 4200.1 sarking and AS 1562 / AS 2050-compliant batten layout
  • Decking / re-batten allowance — % of surface for batten replacement on older homes
  • Code upgrades — modern fasteners for wind/cyclone region, ember-mesh for BAL zones

It also estimates crew duration and debris weight for skip planning.

How to use it

  1. Roof footprint — plan-view area in m². Include the eaves overhang.
  2. Pitch — Australian roofs typically run 17–30°. Newer estate homes are flatter (15–22°); Federation and post-war homes are steeper (22–30°).
  3. New material vs existing material — Colorbond is the dominant new-build choice; tile is more common in older replacements.
  4. Region — Sydney, Melbourne, ACT run +20–30%; Perth and Adelaide near average; Tasmania and rural regions –5–12%.
  5. Decking / batten allowance — 8–15% on homes over 30 years; 20–30% if pre-1980 tile that has used hardwood battens.
  6. Code upgrades — ember-mesh for BAL-29+, Region C fixings for cyclone zones, replace asbestos cement underlay.

Typical 2026 Australian replacement costs

For a 200 m² single-storey home (footprint), mid-cost region:

MaterialA$/m² installedTotal costCrew time
Concrete tileA$70–A$110A$14,000–A$22,0005–7 days
Terracotta tileA$110–A$180A$22,000–A$36,0007–10 days
Colorbond steel sheetA$90–A$140A$18,000–A$28,0004–6 days
Zincalume sheetA$80–A$125A$16,000–A$25,0004–6 days
Slate (imported)A$220–A$380A$44,000–A$76,00010–15 days
Single-ply membrane (low-pitch)A$100–A$160A$20,000–A$32,0003–5 days

Sources: Master Builders Australia 2026 trade benchmarks; hipages 2026 trade cost guide; BlueScope Colorbond and Lysaght distributor pricing Q1 2026; ARC member contractor surveys; Service Seeking 2026 roofing data.

Regional variation in Australia

Labour drives most regional cost variance:

  • High cost (+20–30%): Sydney metro, Melbourne metro, ACT, Northern Beaches, Eastern Suburbs Sydney
  • Above average (+8–15%): Brisbane, Gold Coast, Sunshine Coast, Perth metro
  • National average: Adelaide, Hobart metro, regional NSW, regional Vic
  • Below average (–8–15%): Regional Tasmania, regional WA, NT outside Darwin, far-west NSW

Cyclone regions (C1–C4 — north QLD, NT, north WA) run +15–25% on labour because of the additional fixings, edge tie-down, and engineering certification required under AS 4055.

Code-mandated items

The 2026 BCA / NCC Volume 2 references AS 1562.1 (metal sheeting), AS 2050 (tile fixing), AS 4200.1 (sarking), and AS 3959 (bushfire). Required items:

  • Sarking — Class 4 vapour-permeable foil-faced sarking (e.g. Bradford Anticon, Kingspan Air-Cell) under tiles in Climate Zones 4–8 (most of southern Australia)
  • Bushfire compliance — BAL-12.5 needs only standard sarking; BAL-29 needs ember-mesh at ridge, valley, gutter, and any soffit penetrations; BAL-40 / FZ needs non-combustible sarking and steel gutters
  • Ridge fixing — dry-fix ridge clip systems (no mortar-only ridges) per AS 2050:2018

Together these items add A$1,200–A$2,800 versus pre-2018 mortared-ridge construction.

Common Australian gotchas

Asbestos cement underlay (pre-1990). Licensed removal at A$60–A$120 per m². Always engage a Class B asbestos removalist and get a clearance certificate.

Solar panel removal. A$1,500–A$3,500 to remove and reinstall a 6.6 kW system. Re-roof first if you’re planning solar.

Solar hot water. Heavy units (180–340 kg) — many old systems are at end of life and worth replacing while the roof is open.

Old brittle gutters (Zincalume from the 90s). Often can’t be lifted off without damage. Plan A$45–A$70 per linear metre for new Colorbond gutters.

Roof structure issues. 1960s–70s homes with hardwood battens often need full re-batten — A$25–A$40 per m² additional.

Sources: Master Builders Australia 2026 trade benchmarks; AS 2050:2018, AS 1562.1:2018, AS 4200.1, AS 3959:2018; National Construction Code Volume 2 (2026 amendment); BlueScope Colorbond technical data; Lysaght installer manual; hipages and Service Seeking 2026 market data.

Frequently asked questions

How much does a roof replacement cost in Australia in 2026?
A typical 200 m² Australian house re-roof in Colorbond steel costs A$18,000 to A$28,000 in 2026, including strip, sarking, battens, gutters, and waste removal. Concrete tile replacement runs A$14,000 to A$22,000 on the same house. Terracotta tile is A$22,000 to A$36,000. Sydney and Melbourne run 20–30% above the national benchmark; Perth and Adelaide track close to it; Hobart and regional areas typically run 5–12% below. Source: Master Builders Australia 2026 trade pricing data, hipages and Service Seeking benchmarks Q1 2026.
How long does an Australian roof replacement take?
A standard 200 m² Colorbond replacement takes a four-person crew 4 to 6 working days from strip to clean-up. Tile-to-tile re-roofs take 5 to 8 days. Tile-to-Colorbond conversions add 1 to 2 days because gutter brackets and fascia often need work. Allow weather contingency — summer storms and southerly busters in Sydney, monsoon weeks in Brisbane and Darwin, can push schedules out a week.
Should I replace tile with Colorbond?
Tile-to-Colorbond conversion is one of Australia's most common reroofing jobs — Colorbond is 75% lighter (roughly 4–5 kg/m² versus 45–50 kg/m² for tile) so the structure handles it without engineering. Benefits: better cyclone and bushfire performance, integrates with rainwater tanks more easily, accepts solar without tile-replacement fittings. Costs: Colorbond runs about 15–25% more than concrete tile but lasts 50+ years vs 35–40 for tile. Always specify BlueScope Colorbond or Lysaght genuine product.
What does AS 2050 require for fixings?
AS 2050 sets fixing requirements for tile roofs by wind region (N1–N6 / C1–C4). Region C zones (most of coastal Queensland north of Bundaberg, Northern Territory, NW Australia) require every tile clipped or screwed; Region N3 and below require perimeter tiles fixed and mortar bed at ridge. AS 1562.1 covers metal roof sheeting fastener spacing, with cyclone regions needing every-rib fastening. Always check the Bushfire Attack Level (BAL) — BAL-29 or above mandates ember-mesh and non-combustible underlay.
What about asbestos cement?
Pre-1990 Australian roofs commonly used asbestos cement (AC) sheeting. Removal is regulated under the WHS Regulations and requires a licensed asbestos removalist for areas over 10 m² of bonded asbestos. Add A$60–A$120 per m² for licensed removal, including air monitoring and authorised tip disposal. Always commission a hygienist's clearance certificate before the new roof goes on.
Will my home insurance pay for a roof replacement?
Australian home insurance pays for sudden insured-event damage — storm, hail, cyclone, fire, fallen tree — not gradual deterioration, age-related rust, or maintenance issues. After a hailstorm, photograph damage immediately, file the claim within the policy time limit (typically 30 days), and get a written assessment from an MBA member roofer. ARC (Australian Roofing Contractors Association) members provide insurance-grade reports. Most insurers depreciate Colorbond after 30 years and tile after 40 years.
How much waste does a tile re-roof generate?
A 200 m² concrete tile strip generates about 8–10 tonnes of waste — that's a 6 m³ tipper plus a small skip, or one large skip bin. Terracotta tile is similar weight. Most metropolitan landfills accept tile waste as inert C&D material at A$80–A$140 per tonne. Some councils (Sutherland, Gold Coast) offer concrete-tile recycling diversion, which can save 15–20% on disposal.
How do I find a reputable roofer?
Use Master Builders Association (state-by-state), HIA (Housing Industry Association), or ARC for member directories. Verify the contractor's licence in your state — Victoria (DBDRV), NSW (Fair Trading), Queensland (QBCC), WA (BCITF). Check GenuineColorbond installer status with BlueScope. Get three written quotes itemising scaffold, strip, sarking grade, batten gauge, sheet/tile brand, gutter brand, and waste disposal. Avoid quotes 25%+ below others — they typically skip sarking or use non-Colorbond imported steel.

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