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TPO Roof Cost Calculator

Estimate 2026 Australian TPO single-ply membrane roof cost by line item: 1.2/1.5/2.0 mm thickness, mechanically fixed, fully adhered, induction-welded or ballasted, with PIR insulation, gypsum overlay, outlets, strip-out, council consent and skip removal. Real 2026 ARC, AICA and MBA contractor rates per AS 4654.2.

TPO Roof Cost Calculator

2026 Australian TPO single-ply membrane roof cost by line item — 1.2/1.5/2.0 mm thickness, mechanically fixed, fully adhered, induction-welded or ballasted. Includes XPS/PIR insulation, gypsum overlay, roof outlets, strip-out, council consent and skip removal. Real 2026 ARC, AICA and MBA contractor rates per AS 4654.2.

Estimated TPO roof cost
$409,340
Range: $347,939 – $491,208
membrane + strip + PIR + overlay + outlets + consent + skip
Membrane installed
$242,000
Strip-out
$57,200
PIR insulation
$64,000
Overlay board
$40,000
Outlets
$440
Skip removal
$5,700

What this calculator estimates

This calculator gives you a line-by-line 2026 Australian installed price for a TPO single-ply membrane roof. Whether you are renewing a 60 m² apartment-block flat in Surry Hills, a 600 m² retail roof in Parramatta, or a 4,000 m² distribution centre in Truganina, the calculator follows the line-item structure ARC and AICA member contractors use on real tenders:

  • TPO membrane — 1.2 mm, 1.5 mm or 2.0 mm, mechanically fixed, fully adhered, induction-welded RhinoBond or ballasted
  • Strip-out — removing the existing membrane, insulation and fixings
  • PIR insulation — 100 mm, 150 mm or tapered PIR for fall to outlets
  • Gypsum overlay — Boral Plasterboard FibreCement, Knauf AquaPanel or equivalent
  • Outlet count — roof outlets per AS 3500.3 and overflow scuppers
  • Council consent, skip hire, weekend premium and additional labour

A AUD 2,050 minimum call-out fee applies in most Australian markets even on small jobs, because TPO requires a 2-person crew with a hot-air welder, induction welder (for RhinoBond) and crane or EWP hire.

How to use it

  1. Enter roof area in m² (use the building footprint if the roof is fully flat).
  2. Pick membrane thickness — 1.2 mm for light residential, 1.5 mm for commercial standard, 2.0 mm for premium warranty and Region C/D cyclone zones.
  3. Pick fixing method — mechanically fixed (baseline), fully adhered (+18%), induction-welded RhinoBond (+10%) or ballasted (−15%).
  4. Pick PIR insulation — none (overlay), 100 mm, 150 mm or tapered.
  5. Set scope — spot repair (20%), partial replace (50%) or full re-roof (100%).
  6. Set storey count — single-storey 1.0x, two-storey 1.18x, three-storey or higher 1.40x.
  7. Set access difficulty — easy (drive-up) 1.0x, moderate (rear) 1.10x, hard (EWP needed) 1.30x.
  8. Enter outlet count and toggle strip-out, overlay, council consent, skip hire, weekend premium and any extra labour hours.

Typical 2026 Australian TPO roof cost ranges

These ranges reflect 2026 nationwide pricing from the ARC Member Survey, AICA Single-Ply Member Survey and Q1 2026 quotes from Sydney, Melbourne, Brisbane, Perth, Adelaide and Hobart.

TPO system (200 m², single-storey, moderate access)2026 installed price
1.2 mm mechanically fixed, 100 mm PIR, strip-outAUD 15,000 – AUD 23,500
1.5 mm mechanically fixed, 100 mm PIR, strip-outAUD 21,000 – AUD 32,000
1.5 mm fully adhered, 120 mm PIR, overlay boardAUD 25,500 – AUD 38,000
1.5 mm induction-welded RhinoBond (Region C/D OK)AUD 24,000 – AUD 35,500
2.0 mm mechanically fixed, 150 mm PIR, overlayAUD 27,500 – AUD 42,000
1.5 mm ballasted (Region A only)AUD 16,500 – AUD 25,000
Tapered PIR for fall, 1:80add AUD 26 – AUD 46 per m²
Gypsum overlay (Boral or Knauf AquaPanel)add AUD 18 – AUD 28 per m²
Roof outlet retrofit (cast aluminium)AUD 380 – AUD 580 each
Overlay (no strip-out), 1.5 mm over existingAUD 14,500 – AUD 23,000

Add 18 percent for two-storey, 40 percent for three-storey or higher. Add 10 to 30 percent for moderate to hard access. Add 25 percent for weekend or after-hours work.

Cost drivers

Membrane thickness and Codemark tier. Sika Sarnafil S-327 in 1.5 mm and 2.0 mm is the most-specified TPO system in Australian commercial roofing 2026. Bauder Thermofol U15 (1.5 mm) and U20 (2.0 mm), Cosmofin G/GG and Polyglass Mapeplan T are the next tier. The 2.0 mm cap layer is roughly 50 percent thicker than 1.5 mm and carries a 30 to 50 percent material premium, with labour cost similar.

Fixing method. Mechanically fixed is the fastest install (350 to 550 m² per day for a 2-person crew) and cheapest, but is prone to flutter under high wind and has visible fastener rows — unsuitable for cyclone Region C and D unless RhinoBond. Fully adhered (water-based or low-VOC bonding adhesive) is monolithic and meets Region C/D requirements, but costs 15 to 20 percent more and installs at 220 to 320 m² per day. Ballasted is suitable only for Region A and demands deck-load capacity to accept 60 to 80 kg per m² of river-pebble.

Insulation and overlay. PIR is the dominant substrate. Two layers staggered prevent thermal bridging through joints. Gypsum overlay board (Boral, Knauf AquaPanel, Hardie Backerboard) protects the TPO from PIR facer punctures and is required by Sika, Bauder and Cosmofin for 20+ year Codemark-backed warranties.

Strip-out versus overlay. NCC 2022 Volume Two Part 3.5 permits overlay of one existing layer with new TPO if the deck is structurally sound. Overlay is 25 to 35 percent cheaper than strip-out and reduces tip-fee volume. Strip-out is mandatory if the existing assembly is wet, has interstitial condensation damage, or if a structural engineer requires deck inspection per AS 1170.0.

Outlets and penetrations. Cast aluminium outlets (Lysaght, Holyoak, Quattro) sized per AS 3500.3:2021 are AUD 380 to AUD 580 each installed retrofit. Overflow scuppers, pipe boots and HVAC curb flashings add AUD 240 to AUD 480 each. Reusing existing penetrations is cheaper than relocating but limits PIR fall design.

Storey, access and EWP logistics. A single-storey commercial roof with drive-up access is the cheapest install. Two-storey adds 18 percent for EWP and hoist time. Three-storey-or-higher adds 40 percent for tower crane or telehandler rental at AUD 1,800 to AUD 3,800 per day plus mobilisation. EWP hire is governed by WHS Regulation 2017 Part 4.4 and AS 2550.10.

TPO chemistry and what makes a good Australian product

TPO is a blend of polypropylene and ethylene-propylene rubber, reinforced with polyester scrim. For Australian climate (high UV, moderate to extreme temperature, salt aerosol on coast, cyclonic wind in N/NW), quality varies between manufacturers based on:

  • UV stabilisers: hindered amine light stabilisers (HALS) and UV absorbers extend cap-layer life. Lower-tier products fade and chalk within 8 to 12 years in Brisbane, Perth and Darwin UV exposure.
  • Scrim weight: 800 to 1,500 denier polyester reinforcement. Heavier scrims resist puncture from foot traffic and hailstorm impact (SE QLD and Sydney hail belt).
  • Plasticiser content: TPO uses no plasticisers (unlike PVC), so it does not embrittle in QLD heat the way old PVC membranes do.
  • Salt-aerosol resistance: coastal sites (Sydney, Gold Coast, Cairns, Perth) need confirmed salt-fog tested membrane. Sika Sarnafil S-327 and Bauder Thermofol U15 hold AS 4046.9 salt-spray test data.

For a 20+ year Australian service life, specify a Codemark-certified manufacturer with a 20-year insurer-backed warranty and stainless-steel fasteners (Region C/D mandatory).

Australian code references and authority sources

  • NCC 2022 Volume Two Part 3.5 — roof construction
  • NCC 2022 Section J6 — energy efficiency for low-slope roofs
  • AS 4654.2:2012 — waterproofing membranes for external above-ground use
  • AS/NZS 1170.0/.1/.2/.4 — structural design actions including wind and snow
  • AS 3500.3:2021 — Plumbing and drainage — Stormwater drainage
  • AS 3959:2018 — construction in bushfire-prone areas (BAL ratings)
  • AS 1530.3 — Methods for fire tests on building materials
  • AS/NZS 4859.1 — declared thermal performance of insulation
  • AS 2550.10 and AS 1418 — cranes, hoists and EWP design and use
  • WHS Regulation 2017 Part 4.4 — Falls (working at heights)
  • Codemark product certification — third-party-verified system performance
  • ARC, AICA, MBA — industry associations and quality marks

When TPO is the wrong choice for an Australian flat roof

  • Heritage Council listed buildings — bright white TPO is often refused. Use traditional zinc, lead, copper or terne-coated stainless.
  • Pitches above 5 degrees — water-shedding profiled Colorbond is more appropriate; TPO is designed for pitches below 5 degrees.
  • Cyclone Region D (highest) — only fully adhered or RhinoBond with stainless-steel plates is suitable. Mechanically fixed is unsuitable.
  • BAL-FZ (flame zone) bushfire ratings — TPO is BAL-19 compatible but BAL-29 and above require non-combustible roofing.

Bidding strategy and red flags

Always get three written tenders that itemise membrane brand, thickness, Codemark reference, warranty tier, fixing method, PIR R-value, overlay board and outlet count. Confirm:

  1. The contractor is on the manufacturer’s registered-installer list (required for the 20+ year insurer-backed warranty).
  2. The tender includes wind-uplift design per AS/NZS 1170.2 for your postcode and exposure category.
  3. The tender lists council consent, skip hire and EWP mobilisation as separate line items.
  4. The tender includes a 2-year workmanship warranty on top of the manufacturer’s material warranty.
  5. The tender identifies the on-site supervisor and confirms WHS 2017 Principal Contractor role assignment.

For deeper estimating, also use our flat roof replacement cost calculator, built-up roof cost calculator and roof coating cost calculator to compare TPO against EPDM, mod-bit and torch-on alternatives at your specific square metreage and exposure.

Frequently asked questions

How much does a TPO roof cost per m² in Australia in 2026?
In Australia, 1.5 mm mechanically fixed TPO installs at AUD 100 to AUD 150 per m² all-in for a typical commercial or residential flat roof, including strip-out, 100 mm PIR insulation, gypsum overlay, outlets, council consent and skip removal. 1.2 mm drops to AUD 85 to AUD 130 per m². 2.0 mm with 30-year warranty climbs to AUD 135 to AUD 195 per m². Fully adhered systems add 15 to 20 percent. A 200 m² 1.5 mm mechanically fixed install with 100 mm PIR runs AUD 21,000 to AUD 32,000 in 2026 ARC and MBA member-survey pricing. Source: ARC (Australian Roofing Contractors) Member Survey 2026; MBA Building Cost Index Q1 2026.
Is TPO suitable for cyclone Region C and Region D?
Yes, but specification matters. For cyclone Regions C and D (Townsville, Cairns, Darwin, Broome, NW WA) under AS/NZS 1170.2:2021, only TPO systems with FM Global 4470 1-475 or higher uplift approval should be specified. Sika Sarnafil S-327, Bauder Thermofol U15 and Cosmofin G/GG installed with RhinoBond induction-welded plates at 1:1 fastening pattern with stainless-steel plates meet Region D Ultimate Limit State design wind pressures. Mechanically fixed at standard 1:2 pattern is generally limited to Region A and Region B. Source: AS/NZS 1170.2:2021; FM Global Property Loss Prevention Data Sheet 1-29.
TPO versus Colorbond for an Australian commercial flat?
Different applications. TPO is for low-slope (under 5 degrees) commercial and industrial roofs where a watertight membrane is required. Colorbond is for steeper pitches (above 2 degrees) using profiled steel sheet. TPO is the standard for shopping-centre, warehouse and apartment-block flat roofs. Colorbond is the standard for everything else. For a flat roof, TPO competes with EPDM, modified bitumen (Bituver, Index), and POCB (poured-on coating bitumen — common for legacy roofs in QLD). At AUD 100 to AUD 150 per m² installed, TPO sits between mod-bit (AUD 90 to AUD 130) and fully-adhered EPDM (AUD 130 to AUD 180).
Does TPO carry a Codemark certification in Australia?
Codemark is the national product certification scheme overseen by ABCB. Sika Sarnafil S-327, Bauder Thermofol U15 and Cosmofin G hold current Codemark certificates with declared service life of 30+ years when installed per the certificate. Codemark covers wind-uplift performance per AS/NZS 1170.2, fire-classification per AS 1530.3, and durability per AS 4654.2. NCC 2022 Volume Two Part 3.5 accepts Codemark-certified flat-roof membranes without further testing. State Plumbing Codes (Plumbing Code of Australia) regulate the rainwater outlet sizing per AS 3500.3:2021. Source: ABCB Codemark Australia Certificate Register; NCC 2022 Vol Two Part 3.5.
Do I need PIR insulation under TPO for NCC J6 compliance?
For NCC 2022 Volume Two Section J6 compliance on commercial flat roofs in climate zones 1 through 8, a renewal must achieve a Total R-value of R3.7 to R6.3 depending on zone. 100 mm PIR (Kingspan Kooltherm K10 FM, Bondor RoofRange, Foilboard Premium PIR) achieves approximately R4.5 — a 130 mm or 150 mm board is required to hit R5.4 to R6.3 for cool-temperate (Hobart, Canberra) and alpine zones. Tapered PIR (1:80 fall to outlets) is required when the existing deck has no built-in slope per AS 4654.2. PIR alone runs AUD 28 to AUD 48 per m² installed for 100 to 150 mm. Source: NCC 2022 Vol Two Section J6; AS/NZS 4859.1 R-value declaration.
What is RhinoBond induction welding?
RhinoBond is a Holcim Elevate (formerly Firestone) and Versico mechanical attachment system that uses heat-activated plates fixed through the insulation, then induction-welded to the underside of the TPO at each fastener location. The system eliminates the linear seams at fastener rows (the typical weak point of mechanically fixed systems) and reduces membrane flutter under wind uplift. Cost adds 8 to 12 percent over standard mechanical fixing but delivers a 60 to 100 percent uplift performance bump under FM Global 4470 testing. Essential for cyclone Region C and D and tall buildings on exposed coastal sites. Source: Holcim Elevate RhinoBond technical specification 2026.
How long does a 1.5 mm TPO roof last in Australia?
Industry-standard 1.5 mm TPO from Sika, Bauder and Cosmofin carries 20 to 25-year material and labour warranties under Codemark conditions. Field service life is 22 to 28 years for fully adhered, 18 to 25 for mechanically fixed and 15 to 22 for ballasted systems. Australian UV index (high — Brisbane, Perth, Darwin record UV 11+ for half the year) is the principal limiting factor — micro-cracking exposes the scrim and the membrane fails. Coastal exposure (Sydney, Gold Coast, Cairns, Perth) reduces life by 10 to 15 percent due to salt aerosol. Annual inspections and biennial cleaning extend service life. Recoating with acrylic or silicone coatings (additional AUD 22 to AUD 38 per m²) can extend life by 10 to 15 years.
Does a TPO flat roof need council consent in Australia?
Full strip-out and renewal triggers a council building consent under NCC 2022 in most states if more than 25 percent of the roof area is renewed, or if the work is at height (over 3 m) requiring SWMS per WHS Regulation 2017 Part 4.4. Like-for-like overlay (no strip-out) is generally exempt as a maintenance activity. Cyclone Region C and D properties require an Engineering Computation Submission with the application demonstrating uplift compliance per AS/NZS 1170.2. Heritage-listed properties require additional Heritage Council consent. Source: NCC 2022 Vol Two; WHS Regulation 2017 Part 4.4; state Plumbing Code AS 3500.3:2021.

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