Cavity wall insulation is one of the most effective ways to cut down on heat loss and lower your energy bills. But many homeowners aren’t sure whether their property already has insulation in place. If you’re wondering “How do I know if my house has cavity wall insulation?”, here are the main checks you can carry out in the UK.

1. Check Your EPC Certificate

Every home that has been sold or rented in recent years should have an Energy Performance Certificate (EPC). This document includes details about the energy efficiency of your property and usually states whether cavity wall insulation is installed. You can check your EPC for free by visiting the official government website www.gov.uk/find-energy-certificate.

2. Look at the Age of Your Property

Most homes built after the 1930s were constructed with cavity walls. If your home was built between 1930 and the early 1990s, it may already have had cavity wall insulation installed. Properties built after the mid-1990s are very likely to have insulation as standard.

3. Examine the Brickwork

Cavity walls usually show a regular brick pattern with all bricks laid lengthways. Solid walls, on the other hand, often include bricks laid side-on (known as “headers”) at regular intervals. If you have cavity walls but no record of insulation, your property may still need it.

4. Look for Drill Marks

If cavity wall insulation has been installed, you may see small, evenly spaced drill holes in the external walls of your home. These are where insulation was injected into the cavity before being filled and colour-matched.

5. Arrange a Professional Survey

The most reliable way to confirm whether your walls are insulated is to book a professional cavity wall insulation survey. At Slate Insulations, our team uses specialist equipment to check your property and provide clear advice on the best solution for improving energy efficiency.

Key Takeaway:
If you’re unsure whether your home has cavity wall insulation, start by checking your EPC certificate and looking for visible signs such as drill marks or cavity wall construction. For peace of mind, arrange a professional survey to confirm and explore options for installing or upgrading your insulation.