How to Quote Insulation Installation in Australia
Insulation looks like a simple per-metre job until the roof space shrinks, the old batts need removing and the client wants the wrong R-value. Here's how to quote insulation installation so access, materials and labour are all priced in.
Insulation is easy to under-price. On paper it's area times a rate, but the money lives in the details — a crawl space you can barely turn around in, old loose-fill that has to be vacuumed out, and R-values that have to match the climate zone. This guide covers what an insulation quote should include, what materials cost in 2026, and where margins quietly disappear.
What a good insulation quote covers
A good insulation quote starts with a proper site inspection, then prices everything the job actually involves — not just the batts:
- Site inspection — check every ceiling, wall and underfloor area, and find the access points (manholes, attic ladders, subfloor entries).
- Areas and R-values — measure each area and specify the R-value and material for it.
- Existing insulation — note anything that has to be removed and disposed of.
- Hazards — flag uncertified wiring, suspected asbestos (specialist work) or pest issues before you commit to a price.
- Prep and sealing — sealing around downlights and vents, and any patching after wall work.
- Labour, disposal and safety gear — installation hours plus removal, skip bins and PPE.
Specify the exact product, not just 'insulation'. 'R4.0 Knauf Earthwool ceiling batts' leaves no room for a cheaper substitute or a dispute over energy performance — 'insulation' invites both.
Insulation costs by area in 2026
Insulation cost swings with the area, the material and the R-value. Always calculate per square metre and price each area on its own challenges. As a 2026 starting point for supply, before install:
| Area | Typical batt & R-value | Supply cost / m² |
|---|---|---|
| Ceiling | R3.5 glasswool batts | $10–$15 |
| Underfloor | R2.0 foil-faced batts | $15–$20 |
| Walls | Cavity batts or rigid board | Higher — access-driven |
Wall insulation almost always costs more per metre than ceilings because it needs plasterboard or cladding access, and rigid boards or cavity fill instead of simple batts. Price the walls on the access, not the area alone.
Pricing the materials
Get material costs right by pricing from current supplier rates and adding realistic wastage. R-values follow AS/NZS 4859.1, which sets thermal performance — make sure the specified R-value meets the requirement for the job's climate zone.
- Glasswool and rockwool — fibrous batts with strong thermal and acoustic performance; the everyday choice.
- Polyester batts — allergy-friendly and easy to handle, good where occupants are sensitive.
- Rigid boards (XPS or PIR) — high R-value in a thin profile, ideal for walls and tight spaces.
- Price from suppliers like CSR Bradford, Knauf or Kingspan, and include transport for bulky rolls that won't fit a standard ute.
- Add 5–10% wastage for cuts around downlights, vents and awkward corners.
Working out labour
Your labour rate has to cover site prep, safety and access surprises — not just installation time. Speed depends heavily on the space:
- A skilled installer covers 20–30m²/hour in an accessible roof space with standard spacing.
- Tight underfloor crawl spaces, steep pitches or dodging ducting, wiring and plumbing drop that to 10–15m²/hour.
- Removing old insulation adds real hours — vacuuming loose-fill or bagging degraded batts — plus skip-bin costs.
- Safety gear (respirators, coveralls, gloves, eye protection) is a direct cost; build it into the rate.
- Don't forget travel, site setup and cleanup.
Common mistakes that eat your margin
- Underestimating access. Cramped roof space, steep pitches and tight crawl spaces slash installation speed. Inspect the access before you price the area.
- Vague material specs. Quote exact R-values and brands. 'Insulation' invites substitution and disputes over energy performance.
- Ignoring old insulation. Removing and disposing of existing batts or loose-fill adds hours and skip costs. Charge for it separately.
- Skipping sealing. Downlight cut-outs and vent penetrations need sealing to stop thermal bridges. Price it in or lose the performance you promised.
- No contingency. Older homes and renos hide problems. Add 10–15% so surprises don't come out of your margin.
Pro tips and value-adds
- Check current supplier bulk pricing before you finalise — insulation prices move.
- Photograph difficult access areas on the site visit to justify the labour hours.
- Offer value-adds as separate lines: sarking under tiles or cladding, draught sealing around windows and doors, or acoustic batts in internal walls.
- Suggest ventilation like whirlybirds or subfloor fans where they'll help the insulation work.
- Charge separately for safe removal and certified disposal of old insulation.
- Check the climate-zone R-value requirements — the ABCB (abcb.gov.au) sets the minimums.
ServiceYak keeps your R-values, materials and per-metre rates in a reusable kit, so you can quote ceiling, wall and underfloor areas — plus removal and value-adds — line by line and send the PDF the same day.
Frequently asked questions
How much does insulation cost per square metre in Australia?
As a guide, R3.5 glasswool ceiling batts run about $10–$15/m² to supply, and R2.0 underfloor batts around $15–$20/m² because they're harder to install. Wall insulation costs more again, driven by access. Add labour and wastage on top.
What R-value should I quote?
It depends on the climate zone and the area — ceiling, wall or floor. R-values follow AS/NZS 4859.1, and the ABCB sets the minimum performance for each zone. Always specify the exact R-value and product so there's no ambiguity.
Should I charge to remove old insulation?
Yes, as a separate line. Vacuuming out old loose-fill or bagging degraded batts adds real hours, plus skip-bin and disposal costs — and where asbestos is suspected, it's specialist work that has to be handled accordingly.