Warm Homes Plan

Warm Homes Cavity Walls Grants in BT1

Warm Homes Cavity Walls eligibility for the BT1 postcode district, covering Belfast.

Northern Ireland

Free cavity wall insulation for eligible households

Warm Homes Plan: Cavity Wall Insulation in the BT1 postcode

The BT1 postcode district in Northern Ireland covers the following areas:

What is covered

Free cavity wall insulation for eligible households. Eligibility varies by property and household circumstances. The form below checks what your BT1 address can apply for in about 60 seconds.

Check your eligibility in BT1

Takes about 60 seconds. Submitting this form forwards your details to an approved installer so they can contact you about the scheme.

Frequently asked questions

Can I get free cavity wall insulation in BT1 through the Warm Homes Plan?

Yes. Cavity wall insulation is one of the most common Warm Homes Plan measures for BT1 properties built from the 1920s onward that have unfilled cavities. If your household receives a qualifying benefit and your EPC rating is D or below, you may qualify for free installation. Submit the form to check.

How do I know if my BT1 home has cavity walls?

Most UK homes built between 1920 and 1990 have cavity walls, consisting of two layers of brick with a gap between them. You can often tell by measuring wall thickness (cavity walls are typically 260mm or more), checking your EPC, or asking an installer. Properties built before 1920 usually have solid walls. The free survey will confirm.

How does cavity wall insulation work?

A trained installer drills small holes (typically 22mm) at regular intervals on the outside wall, then injects insulating material (mineral wool, polystyrene beads, or polyurethane foam) into the cavity. The holes are neatly filled and the process takes a few hours with minimal disruption to your BT1 home.

Who qualifies for free cavity wall insulation under the Warm Homes Plan?

You need a qualifying benefit (Universal Credit, Pension Credit, Income Support, or similar) and an EPC rating of D, E, F or G. The property must have suitable unfilled cavity walls. Owner-occupiers and private tenants with written landlord permission can both apply.

Is cavity wall insulation safe?

Yes, when installed correctly by a registered installer in a suitable property. All Warm Homes Plan-funded installers must be TrustMark registered and follow PAS 2030 standards. If the wall has existing damp or structural issues, the installer will identify these during the free survey and advise accordingly.

How much can cavity wall insulation save on bills?

The Energy Saving Trust estimates cavity wall insulation saves a typical semi-detached BT1 home around £145 to £290 per year in heating costs. Actual savings depend on current energy prices, property size, and how well the rest of the home is insulated. Submit the form now to check your eligibility.