Cost of underfloor insulation

underfloor insulation pink batts

Hear from an expert

National insulation supplier Pricewise Insulation breaks down the cost underfloor insulation materials.

For underfloor insulation, you can expect to pay at least $5.50/m2 for the materials. This will get an R2.0, which is adequate for most Australian homes. Assuming that your underfloor area measures around 100m2, you would be paying approximately $500 for the materials alone.

In this example, the assumption is that Knauf Earthwool insulation was used, but the price of a polyester product with the same R-value (measurement of thermal resistance) shouldn’t be much different. It pays to shop around. You might find a supplier who’s willing to offer you a better deal on leftover batts from a large insulation project.

For the installation, you probably won’t be provided with a quote that’s less than the cost of the materials. Depending on the job’s level of difficulty and location, prices can range from less than $1,000 to as much as $2,000.

Factors

The cost of getting underfloor insulation professionally installed will usually boil down to the following factors:

Materials

How much you spend on materials will depend on the R-value of the batts you choose as well as the size of your underfloor area. Generally speaking, the higher the R-value, the more expensive it will be. Large underfloor areas will require more insulation batts, and this will naturally raise the cost as well.

Spacing between joists

You’ll likely benefit from underfloor insulation if your home features a raised underfloor. Tradies will typically install the insulation between the floor joists either in short pieces or as a roll. If the spacing between the joists of your underfloor are too tight, workers will have a harder time in completing the insulation, and they may charge a higher fee for it.

Ease of access

Low and tight access to the underfloor will require an installer to lie on his back in order to fix one insulation batt at a time. This will be more labour-intensive for tradies, so expect to shell out more cash should this be the case. In fact, there are underfloor insulation jobs, that virtually no company wants to do simply because they are too difficult. These kinds of jobs pose an unacceptable risk to their workers’ health and safety. However, this is quite rare. In most cases, as long as the underfloor area is physically accessible, you’ll be able to find a company willing to complete the project.

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