There’s a lot of pressure to insulate your home or building, but why bother? This page provides a simple insulation calculator that helps you work out how much it will cost to insulate your home and how much you might save once you’ve installed the insulation. This is a basic calculation that helps you work out how much it might cost to install and how long it will take to payback in energy savings.

Insulation calculator

Using a standard three-bedroom home with a loft space of 44sq metres, here is the basic calculation:

Calculate how much loft insulation will save you

If you have no existing insulation – the cost to insulate to the recommended depth of 270mm will take two sets of rolls (one set 100mm thick, the second 170mm thick). Using our standard three-bedroom house, this will save you approx $220 / £175 per year. And the total cost of the rolls is approx $5/£3 per roll (note that this includes a carbon emissions saving factored in by the company selling the rolls and is for DIY use only).

If you already have a basic 100mm thickness of  existing insulation (common in properties that had some insulation fitted a few years’ ago) – then this is the insulation calculator for the cost to top-up  to the recommended depth of 270mm which will take one sets of roll (170mm thick). Using our standard three-bedroom house, this will save you approx $220 / £25 per year. And the total cost of the rolls is approx $5/£3 per roll (note that this includes a carbon emissions reduction target savings factored in by the company selling the rolls and is for DIY use only).