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How loft insulation works It acts as a blanket, trapping heat rising from the house below. You should also consider lagging your pipes at the same time for optimum efficiency. Save money If you currently have no loft insulation and you install the recommended 270mm depth you could save around £205 a year on your heating bills and around 1 tonne of carbon dioxide (CO 2) per year. The following table gives approximate costs, savings and paybacks for loft insulation. The Government, energy suppliers and local authorities all provide grants or offers to help you implement energy saving measures in your home. |
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Reduce energy loss
(25% of your heat is lost through an uninsulated roof)
Save on fuel bills (see table below)
Low maintenance
Benefits of loft insulation.
Loft insulation thickness |
(0 - 270mm) |
(50 - 270mm) |
Annual saving per year (£) |
Around £205 |
Around £60 |
Installed cost (£) |
Around £205 |
Around £205 |
Installed payback |
Around 1 year |
Around 4 years |
DIY cost |
Around £300 |
Around £200 |
DIY payback |
Around 2 years |
Around 4 years |
CO2 saving per year |
Around 1 tonne |
Around 300kg |
The installed cost includes the subsidy available from the major energy suppliers under the Carbon Emissions Reduction Target (CERT); the typical unsubsidised installed cost is around £500 for loft insulation to 270mm from either 0mm or 50mm.
How the savings add up
If everyone in the UK topped up their loft insulation to 270mm, over £700m would be saved each year. That's enough money to pay the annual fuel bills of around 550,000 families.
How it is installed
Insulation is simply laid over the floor of the loft, between and then over the joists if they are visible. Protective clothing, gloves and masks should be worn. Care must be taken not to insulate below the cold water tank, if one is present, and not to compress the insulation in tight corners or eaves. Walk boards can then be laid over the joists to provide safe access from the loft hatch to any water tanks (if present).
Loft insulation can be carried out as a DIY task or by a professional installer. There are grants and offers available to help you pay for loft insulation.
Fully Insured
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