As 30% of a homes energy is lost through the walls, it can be prudent to insulate them to reduce this. In some instances by installing wall insulation the heat loss can be massively reduced and comfort significantly increased.

The type of wall you have will depend on the age of your house.

Solid walls were common before 1920
Before the 1920’s Solid walls were common.

Solid Walls

If it was built before 1920 it is likely to have solid walls, after 1920 walls with cavities become the accepted practice and after 1982 these were filled with insulation as they were constructed. The type of wall your house has also dictates how we would insulate it.





A SketchUp drawing of a cavity wall
From the 20’s onwards cavity walls became the accepted form of wall construction.

Cavity Wall Insulation

Small expanded plastic beads are blown into the cavity between the inner and the outer leaf of your building. Holes are drilled into the brick about 1m apart. once the cavity has been filled the small holes are plugged with plastic covers, so you don’t get any falling out afterwards.

External Wall Insulation

This system uses insulated boards which are clad around the outside of the building, this is then rendered with either a white render or a coloured render to give it a good strength and waterproof coating.

Internal Wall Insulation

Insulation is fixed to the insides of the walls which meet the outside (party walls or adjoining walls don’t need to be covered). The depth of the insulation depends on how much heat you want to reduce and also the type of insulation that we would use. There are different materials that we use for insulation; rigid boards or mineral wool or even wood fibre. It is possible for these systems to achieve very good level of thermal insulation.

When your home is very well insulated you will benefit from lower energy bills and also increased levels of comfort. Your home will lose its heat more slowly so you won’t feel the temperature drop as soon as you turn the heating off. In the summer you should benefit from having a slightly cooler house, due to the fact that the sun’s heat can’t penetrate the walls so easily.


The cost of the different systems can vary widely. Cavity wall is quite easy to install whereas external and internal wall insulation cause quite a bit of disruption. Especially internal where in some cases it would be necessary to remove the existing plaster.

If you live in a conservation area, or your home is a listed building, then it becomes even more difficult to insulate your home properly. In most cases external wall insulation will not be allowed in conservation areas. Or on buildings which have been listed. If you do want to improve you home, you should contact your local planning department.

In conservation areas you might be able to install cavity wall insulation. Because it is going into the centre of your wall and won’t be seen from outside, similarly with internal wall insulation. However, if your home is listed, you would be unlikely to be able to install internal wall insulation due to the destructive nature of its installation. Especially if your home has original features. If your home isn’t listed it is possible to re-instate plaster work after the insulation has been installed.

We can guide you through the process and help make sure home home is warm and cosy. Book in for a chat, a survey or an online consultation to make your home snug and warm.