Last updated on 27th July 2026 by ProGuard Exteriors

ProGuard Exteriors completed an external wall insulation transformation on a semi-detached solid wall house in Amersham. The homeowner wanted to improve the energy efficiency and appearance of the original property while ensuring it blended neatly with a newly built rear extension.

Overview

The project involved a semi-detached solid wall property in Amersham with a newly built rear extension. The original house required an energy efficiency upgrade, but it was also important that the finished exterior worked visually alongside the newer construction at the rear of the property.

Following a detailed assessment, ProGuard Exteriors specified a 60mm Kingspan K5 External Wall Insulation system for the original house. This insulation system was selected to improve the thermal performance of the existing solid wall areas while keeping the build-up slimmer than some traditional insulation options.

Our Response

ProGuard Exteriors installed the 60mm Kingspan K5 EWI system to the original house and finished the insulated areas with a premium silicone render. The render finish was carefully matched to the newly built rear extension so the existing property and the new construction could sit together with a clean, consistent appearance.

As part of the wider refurbishment, roof extensions were completed to the side gable to accommodate the new system correctly. Flat roof insulation was also installed to the front and rear flat roofs, helping improve performance across other key heat-loss areas of the home. To complete the project, new soffits and fascias were installed throughout, giving the property a crisp and refreshed external finish.

The gallery above showcases this Amersham external wall insulation transformation, including the 60mm Kingspan K5 EWI system, silicone render matched to the new rear extension, side gable roof extensions, flat roof insulation, and new soffits and fascias throughout.

Final Specification

Property Type: Semi-detached solid wall house in Amersham with a newly built rear extension.

External Wall Insulation: Installed a 60mm Kingspan K5 External Wall Insulation system to the original house.

Silicone Render Finish: Finished the insulated areas with a silicone render system matched to the new rear extension.

Side Gable Works: Completed roof extensions to the side gable to accommodate the new EWI system correctly.

Flat Roof Insulation: Installed flat roof insulation to both the front and rear flat roofs.

Soffits and Fascias: Installed new soffits and fascias throughout to complete the exterior refurbishment.

Benefits Achieved

The completed project improved the energy efficiency and appearance of the original house while helping it blend neatly with the new rear extension.

Improved Energy Efficiency: The 60mm Kingspan K5 EWI system was installed to improve thermal performance across the original solid wall areas.

Slimmer Insulation Build-Up: Kingspan K5 helped improve efficiency while avoiding an overly bulky external profile.

Cohesive External Finish: The silicone render was matched to the new extension, creating a cleaner and more unified appearance across the property.

Improved Roof Performance: Front and rear flat roof insulation helped address additional areas of heat loss.

Refreshed Exterior Detailing: New soffits and fascias throughout gave the property a sharper, more complete finish.

Why Use ProGuard Exteriors

For projects where the original property needs to work alongside a new extension, careful detailing is essential. ProGuard Exteriors managed the insulation, render matching, roof detailing and finishing elements to ensure the upgraded home looked consistent once complete.

Detailed Assessment: The project began with an assessment of the original house, the new extension and the required external upgrades.

Suitable System Specification: A 60mm Kingspan K5 EWI system was specified to improve energy efficiency while keeping the build-up controlled.

Coordinated Finishing Works: Roof extensions, flat roof insulation, render finishing, soffits and fascias were considered as part of the complete exterior upgrade.

Neat Visual Integration: The render finish was matched to the rear extension so the finished home felt more cohesive.

Why It Matters

When an older solid wall property is upgraded alongside a newly built extension, the final result needs to deliver both performance and visual consistency. This Amersham project combined a 60mm Kingspan K5 EWI system, silicone render, roof detailing, flat roof insulation and new soffits and fascias to create a warmer, more efficient and more cohesive home.

Request a free site survey and no-obligation quote today to see how ProGuard Exteriors can support your next external wall insulation project.

ProGuard Exteriors provide external wall insulation, silicone render, flat roof insulation, soffit and fascia upgrades, and exterior refurbishment services for homes across Buckinghamshire and surrounding areas.

We operate throughout Buckinghamshire including Amersham, Chesham, High Wycombe, Aylesbury, Beaconsfield, Gerrards Cross and nearby areas.