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Landlords, housing and commercial

Cavity wall insulation for landlords

For landlords, filling an empty cavity is usually one of the lowest-cost ways to improve an EPC rating. We survey each property, tell you which walls can be filled, and give fixed prices you can plan around.

Row of red brick terraced houses with party walls rising through the roofline

Free survey in your area

Tell us about the property and we will arrange a free survey and a fixed price.

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We use your details only to answer this enquiry and arrange your visit, sharing them only with the registered installer we appoint for your job and the providers named in our privacy notice. No marketing lists, no cold calls.

Planning for EPC C

Government has confirmed that private rented homes in England will need to reach EPC band C by October 2030, with a £10,000 cost cap and exemptions. A filled cavity often contributes a meaningful share of the points needed, and it can be done with tenants in place because the work is outside.

How we work with portfolios

One contact, one schedule. We survey in batches, return a simple sheet per address, and book installs around your tenants. Access arrangements and tenant notices are handled with your agent if you prefer.

What is included

  • Batch surveys
  • Per-property result sheet
  • Fixed prices per address
  • Tenant-friendly booking
  • Photo records for your files

Cavity wall insulation for landlords prices

Cavity wall insulation for landlords guide prices
Cavity wall insulation for landlords guide pricesGuide price
Detached house£2,295–£3,795
Semi-detached house£1,495–£2,495
End-terrace house£1,295–£2,195
Detached bungalow£1,295–£2,195
Semi-detached bungalow£895–£1,595
Mid-terrace house£795–£1,395

No VAT is charged on installing insulation in homes until 31 March 2027 (then 5%). Guide ranges only: the fixed price is confirmed in writing before any work starts, and anything that could not be seen at survey is agreed with you first.

Rules and funding by nation

The building regulations route and the funding schemes differ between England, Wales, Scotland and Northern Ireland. The local pages for your area explain the rules where you are; in short:

  • England: Filling a cavity is notifiable building work and needs a building notice or competent-person self-certification.
  • Wales: Filling a cavity is notifiable work under the Building Regulations as they apply in Wales, usually self-certified through a competent person scheme.
  • Scotland: No building warrant is needed for insulation within a wall, but the work must meet the building standards.
  • Northern Ireland: Inserting cavity wall insulation needs a building control application to the council before work starts.

Sources: Energy Saving Trust: cavity wall insulation; Planning Portal: cavity wall insulation and building regulations; Welsh Government: building work competent person schemes; HMRC: VAT on energy-saving materials (Notice 708/6).

Last reviewed 19 October 2026.

Book a free survey in your area

Free survey with an install quote. Written result. Fixed price before any work.