Cavity Wall Insulation in the UK
Cavity wall insulation suits UK houses built roughly between 1930 and 1990 with a clear, dry cavity, and it is one of the cheapest efficiency measures available — often grant-funded through ECO4 or the Great British Insulation Scheme for eligible households.
Government grants available for cavity wall insulation — see if you qualifyEnter your Postcode to find nearby availability
We use your Postcode to match you with available cavity wall insulation providers nearest to you. Because both you and the provider have Postcodes, results are ranked by true local distance.
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About cavity wall insulation services
It is also the measure with the worst reputation, because filling an exposed or already-damp wall drives moisture across the cavity. A borescope survey before the quote is what separates the two outcomes, and CIGA guarantees are worth having.
How much do cavity wall insulation services cost?
Indicative guide, per job — not a quote. Enter your Postcode for real prices from local pros.
Low
£500
Typical
£700
High
£1000
What affects the price: The cost of cavity wall insulation can vary based on the size of the property, the condition of the existing walls, and the type of insulation material chosen. Accessibility and complexity of the installation process also play significant roles in determining the final price.
What you get on Locufy
- Free, no-obligation quotes from local cavity wall insulation providers
- Local professionals matched by real distance
- Flexible scheduling — including evenings and weekends where offered
- Transparent pricing and clear communication before you commit
What to provide
- Access to areas where insulation will be installed, including exterior walls.
- Information about any existing damp issues or structural concerns.
- Details of your property's energy performance history for tailored advice.
Grants available for cavity wall insulation
You may be able to claim a government grant towards cavity wall insulation in the UK. Grants are paid by the official scheme below — Locufy doesn't administer them. Always confirm the current terms and amounts on the official source, as schemes change.
Energy Company Obligation (ECO4)
gov.uk · delivered by energy suppliers
Typical grant
No fixed amount — insulation and heating measures are funded fully or partly by your energy supplier.
Who qualifies
Households on qualifying benefits (e.g. Universal Credit, Pension Credit, Income Support, income-based JSA or ESA, Child Benefit, Housing Benefit) in a privately owned home with an EPC rating of D–G (E–G if privately rented), or eligible social housing.
Warm Homes: Local Grant
gov.uk · administered by your local council (England)
Typical grant
Free of charge — the council organises and pays for improvements such as wall, loft and underfloor insulation, an air source heat pump, smart controls or solar panels.
Who qualifies
Privately owned homes in England with an EPC rating of D–G, where household income is usually £36,000 a year or less (or someone is on certain benefits, or you live in an eligible postcode).
Common cavity wall insulation jobs
Some of the cavity wall insulation jobs local pros on Locufy take on.
Insulation Assessment
A thorough evaluation of the property's wall structure and existing insulation condition to determine the best approach.
Insulation Installation
The process of injecting or fitting insulation material into the cavity to enhance thermal efficiency.
Damp Proofing
Addressing any moisture issues before insulation to prevent future damp-related problems.
Cavity Wall Insulation Removal
Safely extracting old or damaged insulation materials that may be causing problems.
Ventilation Improvement
Enhancing airflow in the property to prevent condensation and maintain air quality post-insulation.
Energy Efficiency Assessment
Evaluating the impact of insulation on energy bills and comfort levels after installation.
What's involved in cavity wall insulation
- 1Initial property assessment to evaluate wall condition and insulation needs.
- 2Selection of appropriate insulation materials based on property type and requirements.
- 3Preparation of the site, including any necessary damp proofing or repairs.
- 4Injection or installation of insulation material into the cavity walls.
- 5Final checks to ensure even distribution and effectiveness of the insulation.
Good to know
- Ensure the contractor has relevant qualifications and experience in cavity wall insulation.
- Check that the insulation materials used meet current building regulations and standards.
- Consider potential disruptions during installation and plan accordingly.
- Understand the importance of proper ventilation to prevent moisture build-up after insulation.
What cavity wall insulation includes
Initial Assessment
Before installation, a thorough assessment of your property is conducted to identify the best insulation solution. This includes checking the cavity wall space and determining if any repairs are needed.
Insulation Material Options
Various materials can be used for cavity wall insulation, such as mineral wool, polystyrene beads, or foam. The choice of material affects the insulation's performance and cost.
Installation Process
The installation involves drilling small holes into the outer wall and injecting the insulation material into the cavity. Proper sealing is crucial to ensure no air leaks occur after the job is completed.
Post-Installation Inspection
Once the insulation is installed, a follow-up inspection may be conducted to ensure everything is in place. This can help identify any potential issues early on, ensuring optimal performance.
How to book cavity wall insulation on Locufy
Enter your Postcode
Tell us where you need cavity wall insulation — your Postcode pinpoints providers who genuinely cover your area.
Compare local pros
See available cavity wall insulation providers near you with ratings, reviews and clear pricing — no endless phone calls.
Book with confidence
Choose your provider and arrange the job. Badges and real reviews mean no nasty surprises.
Why book cavity wall insulation on Locufy
Verified local pros
Providers can earn verification badges so you can book with confidence.
Truly local results
Matched by real distance using your Postcode — not a rough area guess.
Real reviews
Genuine ratings from customers who actually used the service.
Cavity Wall Insulation — frequently asked questions
What factors influence the cost of cavity wall insulation?
The cost can vary based on the size of the property, the type of insulation material chosen, and any necessary repairs to the walls. Accessibility and the complexity of the installation may also affect pricing.
How long does the installation take?
Typically, the installation of cavity wall insulation can be completed in a day for an average-sized home. However, larger properties or those requiring extensive repairs may take longer.
Do I need a specialist for this job?
While general insulation professionals can perform cavity wall insulation, hiring a qualified specialist ensures compliance with building regulations and standards. This is particularly important if structural work is involved.
Is emergency or same-day service available?
Emergency services for cavity wall insulation are rare, as the process requires planning and assessment. However, some contractors may offer expedited services depending on their availability.
Can I book multiple related jobs together?
Yes, many contractors offer package deals for multiple services such as insulation, draught-proofing, or energy efficiency audits. This can often lead to cost savings.
What is not included in cavity wall insulation services?
Cavity wall insulation does not cover repairs to existing structural damage or issues such as damp proofing. These should be addressed separately to ensure proper insulation performance.
How do I find cavity wall insulation near me?
Enter your Postcode above. Locufy matches you with cavity wall insulation providers who cover your exact area, ranked by true local distance rather than a rough town or county guess.
Is it free to get cavity wall insulation quotes on Locufy?
Yes — searching and requesting quotes from local cavity wall insulation providers carries no subscription fees for customers. You only pay for the work you agree to.
How much does cavity wall insulation cost?
See our researched cavity wall insulation price guide — typical costs, what affects the price, and how to save.