Cavity Wall Insulation involves filling the gap between your walls with the insulation material of your choice. You can choose from mineral wool, polystyrene beads, and foamed insulants.

To insert the insulation material into the wall cavity, small holes around 23 millimeters in size must be drilled in the mortar joints of your walls. For maximum coverage, the holes should be roughly 1.5 meters apart.

Once the holes are drilled, the installers will blow the insulation into the cavity using specialized equipment. Once the cavity is full of insulation material, the holes must be filled-in, to prevent moisture from seeping in. The entire process takes about 2 hours and if done properly, no further maintenance will be needed.

The thermal efficiency that results from Exterior/External Wall Insulation can help you save £120 – £455 a year, depending on your wall structure and the type of house you own. A home with optimal thermal efficiency also has the added advantage of being free from damp and mould because of the absence of cold spots that can cause condensation.

Not only is Exterior Wall Insulation practical, it can also serve as an aesthetic measure. You can choose from a wide range of textured or smooth finishes that are available in various colours, adding a touch of warmth and personal flair to the facade of your home.

Your property likely has cavity walls if:

• It was built after the 1920s.
• Its brickwork has a regular pattern.
• The walls are more than 260 millimeters in width.
• The walls are made of brick and not of stone.

Your property is suitable for cavity wall insulation if it meets the following criteria:

• If the cavity of its external walls are uninsulated.
• The gap between the external walls is at least 50 millimeters wide.
• The brickwork/masonry of the walls are in fine shape.
• The walls are not exposed to driving rain.
• There are no damp spots in your internal walls.
• Access to the external walls is not blocked.

• Installers will need a certain degree of access to the outer walls of your home. If for some reason, access to your outer walls is restricted, our energy assessor will advise if the property can be properly insulated from the outside.
• Installing External Wall Insulation is not recommended if your outer walls are problematic and are difficult to repair.
• If you live in a conservation area, you will need to check with your local council first before you can change the appearance of your home.