Perth insulation prices, updated October 2026

Insulation Cost in Perth

Insulation removal in Perth typically costs $15–$30 per m² of ceiling, and new Knauf Earthwool® batts typically cost $15–$30 per m² installed. Removing old insulation and installing new batts together typically costs $30–$60 per m². Prices are indicative and confirmed in writing after a free on-site assessment by our Wangara team.

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On-Site

Tile Roof Retrofit

Extraction & Batts

1. Old blown-in removal via vacuum

2. Earthwool® batts install

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Updated 27 October 2026

What the price includes

Our Perth prices are quoted per square metre of ceiling and include:

Removal
Vacuum extraction of the old insulation, dust and debris from the roof space through hoses into a sealed truck, and disposal.
New batts
Supply and installation of Knauf Earthwool® glasswool batts fitted between the ceiling joists, with clearances kept around downlights and flues.
Assessment
A free on-site assessment first, and a written quote before any work starts.

Aerial view of Perth suburban rooftops with the city skyline in the distance

What changes the price

Every roof is measured and inspected before we quote. These are the things that move a job up or down the range:

Roof size

Prices are per square metre of ceiling, so the area to be done is the biggest factor.

Roof pitch and access

A low-pitched roof or a small manhole means slower, more careful work in a tight space, which sits at the top of the range. A high roof with good access sits towards the bottom.

What is in the roof

Heavy droppings, nesting material, old loose-fill or several layers of old batts take longer to vacuum out than a single layer of tired batts.

The R-value you choose

Higher R-value batts are thicker and cost more to supply. We recommend an R-value for your home at the assessment.

Perth homes

Most Perth homes are double brick with tiled roofs. Tiled roofs are usually easy to move around in, but older homes often have low pitches at the eaves, and many have had insulation topped up more than once, so there can be several layers to remove.

What R-value do Perth homes need?

Perth is in climate zone 5 under the National Construction Code. You can check your address on the ABCB climate zone map, linked under Sources below.

For a new home built to the NCC 2022 deemed-to-satisfy provisions in climate zone 5, the minimum ceiling insulation for a pitched roof with a flat ceiling is R2.5 to R3.0, depending on the roof colour, whether the roof space is ventilated and whether there is insulation under the roof sheeting (ABCB Housing Provisions, Table 13.2.3f).

Upgrading the insulation in an existing home doesn't have to meet the new-home minimums, but they are a sensible starting point. We recommend an R-value for your roof at the free assessment.

Two technicians in masks feeding a vacuum hose through a tiled roof space

Getting an exact price

Book a free on-site assessment and we'll measure the roof, check what's in it and give you a written quote. Call (08) 9302 2699, Monday to Friday, 7:30am–4pm, or use the quote form on this page.

Before and after comparison of a roof space cleared of old insulation

Typical prices in Perth

Old insulation removal: typically $15–$30 per m²Covers vacuum extraction of old insulation, dust and debris from the roof space, and disposal.
New batts installed: typically $15–$30 per m²Covers supply and installation of new Knauf Earthwool® batts, depending on R-value, roof size and pitch.

Indicative only. Your price is confirmed in writing after a free on-site assessment. Prices are the same in Perth, Melbourne, Sydney and Brisbane. Updated October 2026.

Worked examples for Perth homes

Removal at $15–$30 per m², new batts at $15–$30 per m², or both together at $30–$60 per m². Ceiling areas are examples; we measure your roof at the free assessment.

Typical insulation costs for two example ceiling sizes
Home	Old insulation removed	New batts installed	Removal and new batts
Smaller three-bedroom homeabout 120 m² of ceiling	$1,800–$3,600	$1,800–$3,600	$3,600–$7,200
Larger four-bedroom homeabout 180 m² of ceiling	$2,700–$5,400	$2,700–$5,400	$5,400–$10,800

Indicative only. Your price is confirmed in writing after a free on-site assessment.

Cost guides by city

Sources

Frequently Asked Questions

How much does insulation removal cost in Perth?

Old insulation removal in Perth typically costs $15–$30 per m² of ceiling. For a smaller three-bedroom home with about 120 m² of ceiling that is roughly $1,800–$3,600, confirmed in writing after a free on-site assessment.

How much does it cost to remove old insulation and install new batts in Perth?

Removal and new Knauf Earthwool® batts together typically cost $30–$60 per m² in Perth: about $3,600–$7,200 for a 120 m² ceiling, or $5,400–$10,800 for a larger home with about 180 m² of ceiling.

Are Perth prices different from other cities?

No. Our typical prices are the same in Perth, Melbourne, Sydney and Brisbane. What changes from job to job is the roof size, pitch and access, what is in the roof, and the R-value you choose.

What R-value should I choose for a Perth home?

Perth is in climate zone 5. New homes built to the NCC 2022 deemed-to-satisfy provisions need R2.5 to R3.0 ceiling insulation for a pitched roof with a flat ceiling, depending on the roof. Upgrading an existing home doesn't have to meet the new-home rules, and we recommend an R-value at the assessment.

Where are you based in Perth?

Our Perth depot is at 1/7 Competition Way, Wangara WA 6065. Call (08) 9302 2699, Monday to Friday, 7:30am–4pm. Site visits are by appointment.