top of page


Almost half of all the heat lost from solid walled buildings escapes via the outside walls. If these walls are insulated from inside the building, the rate of heat loss will be reduced, your home will be kept warmer for longer and you will save money on your fuel bills. As well as keeping your property warmer in winter, the insulation will also help to make your home cooler during the summer.


Figure 1: Photograph of Internal wall insulation being installed.

Internal wall insulation (also known as I.W.I) can be installed in most properties and almost all building types including brick, stone, steel-framed and concrete construction. I.W.I is particularly suited for use in flats and apartments or where you need to maintain the external appearance of the building such as in a conservation area. 

Check Your Eligibility Using Our Grant Checker

Please ensure that all information provided below is 100% accurate. Any errors in your personal information could delay or prevent you qualifying for a government funded grant.

Please note that you do not necessarily need to be in receipt of tax credits or benefits as we still may be able to obtain funding for you via your Council or through other funding schemes.

Although Internal Wall Insulation may be more disruptive than other insulation methods such as External Wall Insulation as the work is carried out from inside your house, some people use it as an opportunity to redecorate or update the interior décor of their home. Many people choose not to have their kitchen and bathrooms insulated (as this can involve a lot of extra work in removing and refitting kitchen units and bathroom fixtures) and elect to have only the living areas and bedrooms insulated as these are normally the rooms that are heated and in use the majority of the time.


Installation of Internal Wall Insulation

It is recommended that Internal Wall Insulation is installed by a specialist company as the work normally involves removing and refitting radiators, electric sockets, coving, skirting boards etc.

A professional installer will ensure that the I.W.I is installed with a vapour control membrane to prevent condensation from forming behind the insulation. They will also insulate the whole wall so that there is no risk of thermal bridging.


Figure 2: Diagram showing how Internal wall insulation is installed.

bottom of page