External Wall Insulation

When installing external wall insulation (EWI) on a home, there are many factors to consider for each individual property:

-The age of the building – Older buildings may require additional preparation work before EWI can be installed. Newer builds may already have some insulation so less may be needed.

-The size and style – Larger, detached houses will likely require more insulation than smaller terraced homes. The architectural style may also impact the type of insulation and finishing that can be used.

-Insulation materials – Different insulation boards have different thermal performance and costs. Mineral wool or polymer boards are common options. The thickness required also impacts cost.

-Render and finishes – The external render provides weatherproofing and can have textured finishes for aesthetics. Many textures and colours are available.

Overall, EWI costs can range from £8,000 to £20,000 or more depending on the property. Though it is a big investment, the long-term savings on energy bills usually make the expense worthwhile. Our team can survey your home and advise the best EWI solution for you.

Planning permission is not usually required for installing external wall insulation (EWI) on your home. However, there are some exceptions:

Listed Buildings – If your property is listed or in a conservation area, planning permission will be needed prior to EWI installation. We can guide you through the process.

Terraced Houses – For terraced homes where the external wall runs onto a public pavement, planning permission may be needed as the insulation will extend the wall.

Though EWI does not count as extending the building, building regulations require a Building Notice to be submitted for the exterior changes. A council building inspector will visit at the start and end of the installation to ensure compliance.

So in most cases, EWI does not need full planning permission. Our team is experienced with building regulations and can ensure your insulation project satisfies all necessary council requirements. We handle the paperwork so you can focus on choosing the perfect insulation system for your property.

Installing a proper external wall insulation (EWI) system can reduce heat loss through walls by 35-45%, leading to substantial savings on energy bills.

According to calculations by the Energy Saving Trust, an independent organisation, a typical 3-bedroom semi-detached home could save around £400 per year on heating costs after installing EWI to the recommended standards.

For maximum savings, EWI should be combined with other insulation and draught-proofing measures to create a whole-house system that minimises heat loss. Our team can survey your home and advise the best combination of insulation improvements to reduce your energy costs.

The time required to install external wall insulation (EWI) depends on the size of your property and the weather conditions.

For a small property like a terraced house, it can typically be completed within 1 week during warmer months. However, for a larger detached house, it may take 2-3 weeks to fully install the EWI, especially during late autumn and winter.

The installation process involves preparing the existing walls, fitting insulation boards, applying a reinforcing layer and render, then finishing with textures or paint. The drying times required between layers can be impacted by cold or wet weather.

Our experienced installers will work efficiently to complete the EWI application as quickly as possible. We’ll provide an accurate timeframe for your project after surveying your property and factoring in the weather forecast. With careful planning, we can have your home insulated in no time!