Epc4less: How Loft Insulation improves Energy Performance


Energy efficiency is one of the most important challenges for both the UK and the EU since the early 2000s.This is why the requirement for Energy Performance Certificates (EPCs) was introduced in Belfast, Northern Ireland, in 2008.

Epc4less, who survey houses for the Energy Performance Certificate (EPC), Belfast, have concluded that loft insulation of 270 mm provides a better rating in properties than those having little or no loft insulation. In this article, we see how you can reduce heat loss and improve the Energy Performance Rating of your property by simply insulating your loft.

How Loft Insulation Works?

Use of insulation in your loft creates a barrier before the roof which prevents the movement of heat and considerably reduces the loss of heat through your ceilings. This means that you can keep the heat inhabitable areas of your smart home longer. The thicker your loft insulation is, the lesser will be the loss of heat from your home.


Insulation of lofts can be done merely by ing layers of felt-like insulation material (usually mineral wool) which is easily available at your nearest DIY store. If your loft is easily accessible; you can install the insulation yourself. However, if you are not confident about doing it yourself, get an installer to fit it for you which is equally cost-effective.

Key points to remember if you are fitting it yourself:

  • Squashing down the insulation material will make insulation less effective.
  • Ensure no obstruction for air vents, which is there to prevent condensation.
  • Keep clear of electric wires and light fittings to avoid overheating.
  • Always wear a protective mask and gloves while working with mineral wool insulation.

As an alternative, you can just cut and fit insulation boards between the rafters underneath your roof.

Some Technical Suggestions

  • Installation of insulating material will make your loft colder. So, solve any condensation problem before the installation as it may worsen any damping issues.
  • Since your loft will get colder with an insulating material, it is a good idea to insulate your pipes along with the loft to prevent it from freezing.
  • An insulated loft hatch and use of adhesive draught-proofing strips (available at your local DIY store) for the frame shall prevent blowing of cold draughts into your house through the loft hatch.


The cost will vary depending on whether the insulation is self-installed or done by any hired professional. An estimate by the Energy Saving Trust for the actual cost by self-installation varies from £50 to £350 while varies between £100 to £350 if you get it fitted by a professional depending on whether you get the full insulation fitted or just a top-up.

Impact of Loft Insulation on Energy Performance Certificate

A property which has 270mm of loft insulation installed may have 10 to 15 additional points in their Energy Rating compared to a property of same size, same style, and the same age of built having no insulation at all. 

Contact epc4less for a quote for your EPC rating. You can find epc4less online.

For additional resources visit: https://energysavingtrust.org.uk/home-insulation/roof-and-loft

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