What does underfloor insulation cost?

May 20, 2016 at 2:42 PM

While the days of May might have been balmy for most of the country, there’s no denying that winter is just around the corner. If, like many Kiwis, you’ve been putting off insulating your home, the unseasonably warm autumn weather has given you an extra window of time to tick that task off your ‘to do’ list and protect your family before the winter chill begins to bite.

If you live in a home with timber floors, underfloor insulation is a particularly effective way to get on top of winter chills. High quality underfloor insulation not only stops cold draughts from whistling up between floorboards, it also creates a barrier against moisture that will ensure mould can’t take hold beneath carpets during the wet months. 

While there are many reasons to install underfloor insulation, we know that plenty of people put the job off. One of the biggest reasons? Cost – or, more specifically, the fact that it can be difficult to get an idea of just how much underfloor insulation will end up eating into your home improvements fund. 

Calculating the cost of underfloor insulation

Understanding the cost of underfloor insulation is actually really easy. 

The first piece of information you’ll need is the size of your home in square metres. If you’re not sure about this figure, the information can usually be found within the file that was provided when you bought the property. 

Once you have the floor area of your home in square metres, simply multiply that figure by the per square metre cost of your preferred underfloor insulation product. To get an idea of what it costs to insulate an average New Zealand home, check out the case study below. 

Choosing the right grade of underfloor insulation

Depending on whether you live in New Zealand’s ‘winterless north’ or at the foot of the Alps in Queenstown, your experience of a typical Kiwi winter will be very different.

That’s why most quality underfloor insulation products come in two grades. At EXPOL, our standard underfloor insulation also comes in an extra high performance grade – EXPOL BLACK. EXPOL BLACK is suitable for insulating against the most extreme winter conditions that New Zealand experiences. 

When calculating the cost of underfloor insulation for your home, it’s important to make sure you choose the right grade. 

Case study: the cost of insulating an average kiwi home

The average kiwi home has a floor area of around 100 square metres. If you’re insulating in an area of the country where EXPOL’s standard underfloor insulation will provide sufficient protection, the cost per square metre will be approximately $11. 

That means, to insulate a 100 square metre home with EXPOL’s standard grade underfloor insulation, the total cost would be around $1,100.  

If you live in a part of the country where EXPOL BLACK underfloor insulation is needed, the cost per square metre will be approximately $14 and the total cost will be around $1,400. 

It’s important to note that there will be an additional labour cost if you decide to use an installation company, however EXPOL products are designed to be quick and easy for DIY-ers. So – if you’re keen to save some cash by installing yourself – the process is hassle-free. 

Why choose EXPOL underfloor insulation over other products? 

When it comes to underfloor insulation, EXPOL’s standard and a heavy duty products provide superior protection in a number of ways:

  • Unlike ‘wool’ or ‘batts’ type insulation, the rigid, board-like nature of EXPOL underfloor insulation means it will not sag over time. When underfloor insulation sags, cold air and moisture can enter the resulting void. If you have a ‘wool’ or ‘batts’ type insulation, you should check it annually for signs of sagging and repair or replace any sections that are starting to drop. With EXPOL underfloor insulation, you can be confident that your insulation will not sag – that means you don’t need to keep crawling under the house to check it. 
  • EXPOL products keep moisture out. When it comes to banishing moisture, EXPOL underfloor insulation performs exceptionally. Made of polystyrene, it won’t soak up water or lose its effectiveness if it gets wet. 
  • Installing EXPOL products is fast and easy. Lightweight and easy to cut to size, EXPOL underfloor insulation can be stored outdoors until you install it. Unlike ‘glass wool’ products, it can be handled without protective clothing and won’t irritate your skin. 

Ready to insulate? 

EXPOL underfloor insulation is made in New Zealand and stocked by all major hardware stores. You can find your nearest EXPOL supplier here.

Got a question? 

You can call us on 0800 86 33 73 or email us at sales@expol.co.nz 


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