Cavity Wall Insulation Cost Calculator
One of the most cost-effective ways to improve your home's energy rating. Calculate the install cost and see how much you could save on your annual bills.
Property Details
Estimated Installation Cost
Energy Saving Forecast
Benefits of Cavity Wall Insulation
About 35% of heat loss in an uninsulated home occurs through the walls. Cavity wall insulation acts as a thermal blanket, significantly reducing the amount of energy required to keep your home warm in winter and cool in summer.
Rapid ROI
Unlike solar panels or heat pumps which take 10-15 years to pay back, cavity wall insulation often pays for itself in 3 to 5 years through energy savings alone, making it a top priority for home improvement.
Home Comfort
Insulation doesn't just save money; it stops 'cold spots' and drafts. Warm walls mean you can keep your thermostat lower while feeling just as comfortable as you did previously at a higher setting.
Eco-Tip
Check if you are eligible for the Great British Insulation Scheme (GBIS) or ECO4 grants. Many low-income households or those in lower council tax bands with low EPC ratings can get cavity wall insulation completely free or heavily subsidized.
Installation Process
The process is non-intrusive and usually takes less than half a day.
- Survey: An installer drills a small hole to check the cavity with a borescope.
- Drilling: A series of small holes (approx 22mm) are drilled in the external mortar according to a set pattern.
- Injection: The insulation material is blown into the cavity under pressure.
- Filling: The holes are filled with mortar that matches your existing wall.