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Yes, Grants are still available for Cavity Wall Insulation in Bristol and throughout the West Country.

90% of cavity wall homes will qualify to have Cavity Wall Insulation installed free of charge.

Grants are also available for Loft Insulation in Bristol and throughout the West Country.

From 15/6/25, you can have both Cavity Wall and Loft insulation together under this grant scheme.

Summary of Cavity Wall Insulation FAQs

In a rush? This is a summary of our FAQs. The full version can be found here.

1. Qualifying for a grant

• Two main routes:
  a. General Group — no benefit requirement. No income threshold. The criteria is
  • Council Tax band A‑D (England) or A‑E (Wales) and
  • EPC (Energy Performance Certificate) rating D, E, F or G
• b. Low Income Group — if you’re receiving certain benefits (e.g. Pension Credit, Universal Credit, etc.) and your EPC rating is D‑G. Income thresholds apply for child benefit qualification.

2. How to apply & surveys

• We handle all the paperwork: eligibility, survey, grant application, etc.
• A free no‑obligation survey is carried out, which includes a Cavity Assessment Survey (CAS) to check if the walls are suitable for insulation.

3. Government scheme & guarantee

• The scheme is part of the Great British Insulation Scheme, under the Energy Company Obligation (ECO), funded indirectly via energy bills.
• Once installed, there’s a 25-year guarantee via the Cavity Insulation Guarantee Agency (CIGA) — provided the property passes the Cavity Assessment Survey.

4. Suitability of your house

• Homes built after 1925 are more likely to have cavity walls. Key factors: there must be an unfilled cavity, cavity width of at least 50mm, external brickwork/masonry generally in good condition.
• Some types of properties may not be suitable: e.g. concrete construction, timber‑framed, or homes that already have insulation installed. Also, any damp issues must be addressed first.

5. Materials used & process

• We use “SuperBead” polystyrene beads (not mineral fibre) for the insulation. SuperBead has good thermal efficiency, resists water, reduces or even eradicates condensation, provides fire safety, and has durability (potentially for the life of the building).
• Installation: drill small holes in the external walls (approx. 22mm), blow the beads in, then fill and colour‑match the holes. Works from the bottom up. For a typical house, the job takes 2‑3 hours.

6. Benefits & impact

• Significant reductions in heat loss through walls (walls are a major source of heat loss – 35%), lower fuel bills ( £400/year for a 3-bed semi with mains gas).
• Helps reduce or eradicate condensation and mould, more comfortable indoor temperature, environmental benefits like lower CO₂ emissions (up to 3 tonnes/year).

7. Risks / potential issues

• Damp: If your home has existing damp issues (structural or otherwise), the survey will fail, and no grant will be approved. Must resolve damp before insulation is installed.
• Past issues with inappropriate insulation in unsuitable walls (leading to damp problems) are acknowledged. Newer insulation material and quality control (with the CAS & audit procedures) aim to avoid these.

The Green Home Grant Scheme

The Green Home Grant scheme was cancelled by the Government on 31st March 2021. It has now been replaced by The Great British Insulation Scheme.