External Cavity Wall Insulation

Cavity fill is injected between the inner and outer walls of a property with a cavity gap, while external wall insulation is fixed to the outside of solid walls. External insulation creates a continuous thermal “jacket” around the home, improving efficiency even where cavities don’t exist.

No — external wall insulation is specifically designed for properties with solid walls, although it can also be used on cavity wall homes if required.

Yes, but in a positive way. The insulation is finished with a new weatherproof render or cladding, which can refresh and modernise the appearance of your property.

Typically between 60mm and 100mm, depending on the system used and the level of insulation needed to meet regulations.

With proper installation and maintenance, external wall insulation systems last 25–30 years or more. Many come with manufacturer warranties for added peace of mind.

Yes. By creating a weatherproof barrier and reducing cold bridging, external insulation helps prevent penetrating damp and condensation on internal walls.

Most homes do not require planning permission, but listed buildings, conservation areas, or properties with a distinct external appearance may need approval.

Costs vary by property size and finish choice, but many households offset the expense through long-term energy savings and available grants.

Yes, scaffolding is normally required to safely apply insulation and render to upper storeys. This is included as part of the installation process.

External wall insulation typically comes with a 25-year guarantee on materials and workmanship, ensuring long-term performance.