How much does insulation cost in Perth?
Roof insulation is what Perth searches for most, and ceiling batts are $13–$37 per square metre fitted, typically $21. Across the ceiling of a three-bedroom home that adds up to $1,250–$4,200. Homes here run large, with 45.7% of Greater Perth dwellings having four or more bedrooms (ABS 2021 Census), so many ceilings are bigger than that benchmark and the square-metre rate is the better guide to your own bill. Pulling out old or damaged insulation first adds $8–$26 a square metre. Prices include GST.
Comparing cities, or after the Australia-wide picture? See the national guide: Insulation cost in Australia.
Detailed Pricing — Insulation Cost in Perth 2026
| Service | Low | Typical | High |
|---|---|---|---|
| Ceiling insulation batts (per sqm installed) | $13/sqm | $21 | $37 |
| Wall insulation batts, open frame (new build or renovation, per sqm installed) | $10/sqm | $16 | $26 |
| Underfloor insulation (per sqm installed) | $16/sqm | $26 | $47 |
| Ceiling insulation – 3-bed home (total) | $1,250total | $2,625 | $4,200 |
| Wall insulation – 3-bed home (total) | $1,575total | $2,625 | $4,200 |
| Underfloor insulation – 3-bed home | $1,250total | $2,100 | $3,350 |
| Reflective foil insulation (per sqm) | $8/sqm | $15 | $23 |
| Spray foam insulation (per sqm) | $32/sqm | $52 | $105 |
| Blown-in / loose-fill (per sqm) | $19/sqm | $26 | $52 |
| Ceiling insulation top-up over existing (per sqm installed) | $10/sqm | $19 | $32 |
| Remove old insulation (per sqm) | $8/sqm | $16 | $26 |
| Labour only (insulation installer, per hr) | $42/hr | $63 | $84 |
| Retrofit wall insulation, existing walls (blown-in or injected, per sqm) | $26/sqm | $42 | $74 |
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Get Perth quotes →Prices include GST. Based on Perth metro area, October 2026. Outer suburbs may vary.
What Affects Insulation Costs in Perth
Summer heat in the roof space
Perth Metro averages 31.4 °C in January and 31.7 °C in February (BOM averages), and a closed roof space gets far hotter than the air outside. Ceiling insulation slows that heat on its way down into the rooms, so it earns first place on the to-do list. Crawling through a roof at its hottest is hard going, so ceiling jobs are more comfortable to schedule from May to September.
R-values for zone 5
The National Construction Code links the minimum R-value of a roof, wall or floor to the climate zone a home sits in, and central Perth falls within zone 5, described as warm temperate. Batts with a higher R cost more per square metre but hold back more summer heat and winter chill. Have each installer state the R-value and product on paper so the prices line up.
Top up or start again
In an older ceiling the batts may still be there but flattened or patchy. Laying new ones over the existing layer costs $10–$32 a square metre. Damp, contaminated or rodent-damaged material has to be cleared before new batts go down, which costs $8–$26 a square metre. If there is any chance of asbestos in the roof, get a licensed asbestos assessor in first; removal needs a licensed contractor.
Batts, foil, blown-in or foam
Glasswool, polyester and rockwool batts are the everyday choice at $13–$37. Reflective foil ($8–$23) bounces radiant heat back off the underside of the roof and is often paired with batts. Blown-in loose fill ($19–$52) reaches low edges where batts are awkward to lay, and spray foam, at $32–$105, is the dearest per square metre in our table.
Walls in a bigger home
Greater Perth averages 3.3 bedrooms a dwelling, against 3.1 nationally (ABS 2021 Census), and more rooms mean more external wall. Batts in an open frame cost $10–$26 a square metre, so a renovation or extension is the cheaper moment to do it. Insulating finished walls means blowing or injecting material into them, at $26–$74.
Underfloor needs a gap
Underfloor insulation is $16–$47 per square metre ($1,250–$3,350 to do an entire three-bedroom house), and it only works where the floor is suspended timber with room to crawl underneath. A house on a concrete slab has no cavity under it to fill, so check what is below your floor before asking for this line on a quote.
Rebates and help in WA
No federal rebate exists for home insulation. The retailer-run discount schemes found in some other states do not cover WA homes. In WA, Energy Ahead (formerly the Household Energy Efficiency Scheme) gives eligible households hands-on help to make their homes more energy efficient, so check whether you qualify before paying the full price.
How to Save Money on Insulation Cost in Perth
Insulation Cost in Perth by Home Size
Bigger homes mean more rooms and more external wall. Say a Perth house has 120 square metres of ceiling and an extension opens 100 square metres of wall frame: 120 at $13–$37 plus 100 at $10–$26 comes to $2,560–$7,040. The three-bedroom wall row, $1,575–$4,200, assumes the frame is open too.
The state of the old batts and the floor below move a job of that size. Older batts may be flattened but sound enough for a top-up at $10–$32 a square metre, while damaged ones are cleared first at $8–$26. A slab floor has no cavity under it, so the $1,250–$3,350 underfloor row applies only to a suspended timber floor, and a roof space in January or February slows any crew.
Insulation Cost in Perth: What the Quote Should Include
A Perth insulation quote should show whether the roof gets a new layer or a top-up, because an older ceiling may still hold flattened or patchy batts. Ask for the existing layer to be described, then for each choice priced on its own line with the area in square metres.
- A description of what is already in the roof: flattened, patchy, damp or rodent-damaged batts, with photos taken during the inspection.
- A top-up over the existing batts at $10–$32 a square metre, priced beside starting again with a full new layer at $13–$37 a square metre.
- Clearing of damp, contaminated or damaged material shown as its own line at $8–$26 a square metre, or stated as folded into the total.
- Product named for the roof: glasswool, polyester or rockwool batts, with thickness and the R-value the product is rated at.
- Reflective foil at $8–$23 a square metre, shown separately where it is paired with batts under the roof.
- Blown-in loose fill at $19–$52 a square metre where the roof is low and batts are awkward at the edges, with the area it covers.
- Underfloor only after the installer checks below the floor: a suspended timber floor with room to crawl, not a slab, at $16–$47 a square metre.
- Roof-space work set for the cooler months from May to September where the job can wait, with start and finish dates written down.
- Warranty terms for product and workmanship, payment stages and GST.
Frequently Asked Questions — Insulation Cost in Perth
Our Methodology
These are independent estimates from public cost guides, marketplaces and industry rate data, and no tradesperson can influence them, so always get a few quotes. Last reviewed October 2026. Read our full methodology →