HOW TO HIRE · TRADES & CONSTRUCTION

How to hire an insulation installer in the UK
The checks, the questions and the paperwork.

Loft insulation needs no approval in England; wall insulation is notifiable. The checks, VAT, grants in Scotland and Wales, and the questions to ask.

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THE 60-SECOND VERSION

Hiring an insulation installer in five steps

  1. Say which part of the houseLoft, cavity walls, solid walls inside or out, or floors — the rules differ.
  2. Check the scheme for wall insulationIn England, wall insulation is self-certified by a scheme installer or notified to building control.
  3. Ask about ventilation and dampInsulation done badly traps moisture; the installer should check first.
  4. Check VAT and grants0% VAT on installed insulation; Home Energy Scotland or Nest if you qualify.
  5. Keep the paperworkCompliance certificate for wall insulation, guarantees and the invoice.

BEFORE YOU BOOK

Check before you book

No register applies

No single licence or register applies to insulation installers across the four nations. In England, insulating a roof space or under timber floors needs no building regulations approval, while cavity, internal and external wall insulation is notifiable building work.

For the insulation work, ask which part needs approval and who is handling it. gov.uk →

Competent person schemes for walls

gov.uk lists the schemes that can self-certify wall insulation in England: for cavity walls Blue Flame Certification, CERTASS, Certsure, the Installation Assurance Authority and NAPIT; for internal and external walls BBA, Blue Flame Certification, CERTASS, Certsure and NAPIT.

If the insulation work includes walls, ask for the scheme name and the compliance certificate afterwards. gov.uk →

TrustMark

TrustMark is the Government Endorsed Quality Scheme for work in and around the home; it is voluntary and registration is per trade.

Search the business on TrustMark for the insulation work you need. trustmark.org.uk →

Insurance and trader status

Ask who insures the trader doing the insulation work and for how much; public liability is standard. The Consumer Rights Act 2015 covers the insulation work when the provider is a trader, and a contract made off-premises or online can usually be cancelled within 14 days under the Consumer Contracts Regulations 2013 — less what was done if you asked for an early start, and not at all for goods made to your specification.

For the insulation work, see the insurance document and confirm the profile carries the trader and ID-checked badges.

VAT

Installing insulation in a home is zero-rated (0%) until 31 March 2027, then 5% from 1 April 2027; the same material bought without installation, or fitted in a hotel or other commercial building, is standard-rated, and an installer over the £90,000 threshold must still register and show the VAT, at 0%, as its own line.

Ask for the VAT number and check the insulation quote shows 0% on the fitted material and that nothing on it is charged at the standard rate. gov.uk →

“Which insulation do you recommend for this house, and why?”

A good answer: A recommendation after looking at the walls, loft and floors, with the reasons.

“Does any of the insulation work need building regulations approval?”

A good answer: In England, wall insulation does, through a scheme or building control; loft and under-floor insulation does not.

“How will you deal with ventilation and moisture?”

A good answer: Loft ventilation kept clear, vapour control where needed, and no damp trapped behind new insulation.

“What thickness of insulation will you install?”

A good answer: A stated thickness or performance, written on the quote.

“Will the 0% VAT rate apply to the insulation?”

A good answer: Yes, on insulation installed in a home until 31 March 2027.

“Am I eligible for help with the insulation cost?”

A good answer: In Scotland, Home Energy Scotland if the EPC or a report recommends it; in Wales, Nest for eligible households.

Getting the quote right

  • Each area to be insulated, the material and its thickness
  • Ventilation and vapour control measures
  • Building regulations route for any wall insulation
  • Who actually attends — the installers fitting the insulation, employed or subcontracted — and the business's VAT number, with VAT at 0% on the installation shown as its own line
  • Making good, boarding or decorating stated as in or out

Walk away if

  • Insulates a loft and blocks the eaves ventilation
  • No survey before quoting wall insulation
  • Charges the standard VAT rate on insulation fitted in your home
  • Cold-call grant offers with no scheme named
  • No compliance certificate for wall insulation in England
LOW
£300
TYPICAL
£2,500
HIGH
£8,000

What an insulation installer costs: £300–£8,000 per job

Insulation is priced per job by the part of the house, its size and access; VAT is 0% on insulation installed in a home. Insulation Installer price guide →

Guide prices compiled by the Locufy team from published Irish and UK provider price lists and 2026/27 cost guides. Updated 2026.

KNOW WHAT TO LOOK FOR? NOW FIND ONE

Insulation installers near you, with the badges that matter shown

ID checked, trader status and one score from every review — on the card, before you message anyone. Nearest first. No account needed to look.

Or post the job free and let them come to you.

  1. SurveyWalls, loft, floors, ventilation and any damp checked.
  2. SpecifyMaterial, thickness and the approval route agreed.
  3. PrepareServices protected, ventilation paths kept clear.
  4. InstallInsulation fitted to the agreed specification.
  5. CertifyCompliance certificate for notifiable work and any guarantee issued.

U-value
How much heat passes through a wall or roof; lower is better.
Vapour control layer
A membrane that stops moisture reaching cold surfaces.
Internal wall insulation
Insulation fixed to the inside face of a solid wall.
External wall insulation
Insulation fixed to the outside and rendered over.
Eaves ventilation
Airflow at the roof edge that keeps a loft dry.
Compliance certificate
The scheme's confirmation that notifiable work meets the Building Regulations.

AFTER

When the job is done

Keep the paperworkCompliance certificate for wall insulation, any guarantee and the itemised invoice.
Check the loft ventsEaves ventilation still clear after loft insulation.
Watch for condensationOver the first winter, any new damp is a reason to call the installer back.
Review the jobOnly booked jobs can be reviewed on Locufy, so yours carries weight; if the insulation work falls short, use the make-it-right step first and the provider is asked to fix it before the review is published.

MONEY BACK

Grants that may apply

Public schemes that can pay towards insulation in Scotland and Wales. Check eligibility and apply before work starts.

SCOTTISH GOVERNMENT (HOME ENERGY SCOTLAND) · GRANTVerified 16 Oct 2026

Home Energy Scotland grant and loan

up to £7,500 grantClean heating such as a heat pump: grant up to £7,500 plus an optional interest-free loan up to £7,500. Energy efficiency such as insulation: grant up to 75% of the cost, capped at £7,500, plus an optional loan up to £7,500. Rural and island homes can get up to £1,500 more on each.

Who: homeowners in Scotland; landlords, businesses and developers cannot apply

  • the improvement must be recommended in the home's Energy Performance Certificate, Home Energy Improvement Report or Home Renewable Selector Report
Official details on mygov.scot →
WELSH GOVERNMENT · GRANTVerified 16 Oct 2026

Nest

free improvementsThe Welsh Government describes the improvements as free to eligible households; no cash amount is published on the page.

Who: owner-occupiers and private tenants in Wales (not council or housing association tenants)

  • a means-tested benefit (such as Universal Credit or Pension Credit) or a low household income
  • EPC rating of 54 (E) or below, or 68 (D) or below where someone has an eligible health condition
Official details on gov.wales →

Schemes change. The amounts above were checked on the dates shown; the official page is the one that counts.

STEP 1Put it to the installer in writingDescribe the fault with the insulation work, with photos, and say what would put it right. The Consumer Rights Act 2015 expects a trader to use reasonable care and skill; where that fell short you may require the work to be done again, or a lower price.
STEP 2Use Locufy's make-it-right stepRate the insulation work under four stars and you are asked whether to send it to the provider first; we follow it through. Then the review goes up.
STEP 3Certification or grant problemsIf the insulation work was MCS certified and is faulty, MCS takes complaints about its certified installers; grant problems go to Ofgem, which runs the Boiler Upgrade Scheme. For a dispute about the insulation work with the trader, Trading Standards is reached through the Citizens Advice consumer helpline on 0808 223 1133 in England and Wales, Advice Direct Scotland on 0808 800 9060, or Consumerline on 0300 123 6262 in Northern Ireland.
STEP 4Money still in disputeIf the insulation work is still not settled, you can claim without a solicitor: the small claims track takes claims up to £10,000 in England and Wales, simple procedure up to £5,000 in Scotland, and the small claims court up to £5,000 in Northern Ireland.

Hiring an insulation installer: questions people ask

No single register applies. In England, wall insulation must be self-certified by a scheme installer or notified to building control; loft and under-floor insulation needs no approval.

For wall insulation in England, a compliance certificate from the installer's scheme; for any insulation, the invoice and any guarantee.

£300–£8,000 a job, typically around £2,500. Which part of the house, its size and access decide it. See the Insulation Installer price guide for the detail, then search your postcode above to compare insulation installers nearby.

Insulation installed in a home is zero-rated until 31 March 2027, then 5%.

In Scotland, the Home Energy Scotland grant and loan; in Wales, Nest for eligible households; in Northern Ireland, nidirect points to Affordable Warmth for households in fuel poverty.

If ventilation is blocked or moisture trapped, yes; that is why the survey matters.

MORE GUIDES

More hiring guides in trades & construction

How to hire: Loft InsulationHow to hire: Cavity Wall InsulationHow to hire: Dry LiningHow to hire: RenderingHow to hire: CladdingHow to hire: Damp ProofingHow to hire: Loft ConversionHow to hire: BuilderAll 701 hiring guides →

Insulation installers near you

Insulation installers in LondonInsulation installers in ManchesterInsulation installers in BirminghamInsulation installers in GlasgowInsulation installers in BelfastAll insulation installers on Locufy →

Sources — checked October 2026

  1. gov.uk — building regulations: when you do not need approval
  2. gov.uk — competent person schemes: current schemes and the work they cover
  3. gov.uk — VAT on energy-saving materials and heating equipment (Notice 708/6)
  4. TrustMark — the Government Endorsed Quality Scheme
  5. mygov.scot — Home Energy Scotland grant and loan
  6. gov.wales — free home energy efficiency improvements from Nest: eligibility
  7. nidirect — energy saving grants in your area
  8. Consumer Rights Act 2015, section 49 — reasonable care and skill
  9. Consumer Rights Act 2015, section 54 — what you can ask for when a service falls short
  10. Consumer Contracts Regulations 2013, regulation 30 — the 14-day cancellation period
  11. Consumer Contracts Regulations 2013, regulation 28 — contracts the cancellation right does not cover
  12. Consumer Contracts Regulations 2013, regulation 36 — services started within the cancellation period
  13. Civil Procedure Rules Part 26 — the small claims track limit (England and Wales)
  14. Scottish Courts and Tribunals — making a claim under simple procedure
  15. nidirect — the small claims process (Northern Ireland)
  16. Energy-saving materials and heating equipment (VAT Notice 708/6) — 2.1 Zero-rated installations; 2.10 Insulation
  17. GOV.UK — VAT rates
  18. GOV.UK — Register for VAT: when to register