HOW TO HIRE · TRADES & CONSTRUCTION

How to hire a garage conversion builder in the UK
The checks, the questions and the paperwork.

A garage conversion needs building regulations approval or a Scottish warrant. The checks, the floor and wall questions, and the paperwork.

  • Search and compare — no account needed
  • Nearest to you first
  • One score from Google, Trustpilot and Locufy reviews

THE 60-SECOND VERSION

Hiring a garage conversion builder in five steps

  1. Check the approvalsBuilding regulations always; planning sometimes.
  2. Ask about floor and wallsDamp-proofing, insulation and raising the floor to the house level.
  3. Agree the door openingInfill wall and window where the garage door was.
  4. Plan ventilation and heatingA habitable room needs both.
  5. Get the completion certificateThe room counts as habitable only with approval.

BEFORE YOU BOOK

Check before you book

No register applies

For the garage conversion there is no register to search: garage conversion builders need no licence anywhere in the UK, and the law bites through building regulations approval, or Scotland's building warrant, when the work calls for it. For the garage conversion, a trader should hold public liability insurance; check the insurer and the cover. Trader status matters: it brings the Consumer Rights Act 2015 into play, and under the Consumer Contracts Regulations 2013 an off-premises or online booking usually has 14 days' cancellation, with any work you asked to start early charged for and personalised goods outside the right.

Get a clear answer on approval for the garage conversion, and the reference number if there is one. See the insurance certificate before you confirm the garage conversion; the Locufy profile shows the trader and ID-checked badges. gov.uk →

Building regulations approval

Turning the garage into a habitable room is a change the Building Regulations cover, so the garage conversion needs approval for insulation, damp protection, ventilation and fire safety. Where the garage conversion goes through a full plans application in England, building control usually issues a completion certificate within 8 weeks of the work finishing, if it complies.

Get the building control reference for the garage conversion before anything starts. gov.uk →

Building warrant (Scotland)

Scotland puts the warrant duty on the owner: if the garage conversion needs a building warrant and there is none, the council can fine you and order the work taken out, whoever built it. Northern Ireland asks you to notify the council's building control before the garage conversion begins.

In Scotland, see the warrant before the garage conversion begins; in Northern Ireland, ask for the building control reference. mygov.scot →

Asbestos

Under the Control of Asbestos Regulations 2012 (and Northern Ireland's own 2012 Regulations), sprayed coatings, pipe lagging and most asbestos insulating board may only be removed by an HSE-licensed contractor, which matters wherever the garage conversion cuts into an older home.

Ask how suspect materials will be identified before the garage conversion starts cutting or drilling. hse.gov.uk →

VAT

A garage turned into part of the existing house is standard-rated at 20%; the 5% reduced rate applies only if the conversion changes the number of dwellings or the house had stood empty for at least two years, and a builder turning over more than £90,000 must register, charge the VAT and show it separately.

Ask for the VAT number, and look for VAT as its own line on the conversion contract. gov.uk →

“How will the garage conversion floor be built?”

A good answer: Damp-proof membrane, insulation and a new floor level, explained.

“What will you do with the garage door opening?”

A good answer: An infill wall on suitable foundations, with a window, approved by building control.

“How will the walls be insulated?”

A good answer: Insulation to the standard building control asks for, with the method stated.

“How will the room be ventilated and heated?”

A good answer: Windows, trickle vents or a fan, and a heating plan.

“Is the garage roof sound?”

A good answer: Checked, with any asbestos cement roof sheeting identified before work.

“Who applies for building regulations approval?”

A good answer: Named, with a reference before work starts.

Getting the quote right

  • Floor, walls and roof insulation specified
  • Infill wall, window and foundations
  • Electrics, heating and ventilation
  • Building control fees
  • Who actually attends — the builders and each trade on the conversion, employed or subcontracted — and the business's VAT number, with VAT at 20% shown as its own line
  • Stage payments

Walk away if

  • No building control involvement
  • Leaves the floor uninsulated
  • Infill wall on the old door threshold without foundations
  • Ignores old roof sheets that could contain asbestos
  • Large deposit
LOW
£10,000
TYPICAL
£18,000
HIGH
£30,000

What a garage conversion builder costs: £10,000–£30,000 per project

Garage conversions are quoted per project; the size of the garage, the work the shell needs and adding a bathroom or kitchenette set the figure. Garage Conversion 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

Garage conversion builders 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. ApprovalsBuilding regulations approval and planning if needed.
  2. Strip and prepareGarage cleared; roof and walls checked.
  3. Floor and infillDamp-proofing, insulated floor and the new infill wall built.
  4. Fit-outInsulation, electrics, heating, plastering.
  5. CompletionBuilding control final inspection and certificate.

Infill wall
The new wall where the garage door was.
DPM
Damp-proof membrane under the new floor.
Habitable room
A room used for living, which must meet building regulations standards.
Trickle vent
A small vent in a window frame.
Completion certificate
Building control's confirmation that the work complies.
Asbestos cement
A material found in some older garage roofs.

AFTER

When the job is done

Keep the completion certificateProof the room is habitable for a sale or a valuation.
Keep the trade certificatesElectrical and any heating certificates.
Check for dampOver the first winter, walls and floor dry.
Review the jobOnly booked jobs can be reviewed on Locufy, so yours carries weight; if the garage conversion falls short, use the make-it-right step first and the provider is asked to fix it before the review is published.

STEP 1Contact the builder in writingExplain clearly what has gone wrong with the garage conversion, what the quote or contract said, and when you need it put right. The Consumer Rights Act 2015 treats reasonable care and skill as part of the deal, and lets you claim a redo or a reduction when it is not met.
STEP 2Use Locufy's make-it-right stepRate the garage conversion 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 3Unapproved or dangerous workAn approval that was needed for the garage conversion and never obtained is taken up by the council: building control in England, Wales and Northern Ireland, or in Scotland the building standards service, which holds the owner responsible for the warrant. For a dispute about the garage conversion 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 garage conversion 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 a garage conversion builder: questions people ask

Yes, because a habitable room must meet the regulations; in Scotland a building warrant is needed.

No law licenses builders; check building control, insurance and finished examples.

£10,000–£30,000 a project, typically around £18,000. A double or detached garage, a bathroom and the state of the shell move it. Read the Garage Conversion price guide for what is in and out of the price, and use the postcode search above to find local garage conversion builders.

Sometimes; planning permission and building regulations approval are separate, and you might need both.

If it may contain asbestos cement, HSE classes breaking it up as notifiable work; get it checked first.

A habitable room with a completion certificate is what a buyer will count.

MORE GUIDES

More hiring guides in trades & construction

How to hire: BuilderHow to hire: House ExtensionHow to hire: ArchitectHow to hire: PlastererHow to hire: BricklayerHow to hire: Damp ProofingHow to hire: Insulation InstallerHow to hire: General ContractorAll 701 hiring guides →

Garage conversion builders near you

Garage conversion builders in LondonGarage conversion builders in ManchesterGarage conversion builders in BirminghamGarage conversion builders in GlasgowGarage conversion builders in BelfastAll garage conversion builders on Locufy →

Sources — checked October 2026

  1. gov.uk — building regulations approval (England)
  2. gov.uk — building regulations: how to apply
  3. TrustMark — the Government Endorsed Quality Scheme
  4. mygov.scot — if a builder is doing the work for you
  5. nidirect — how to apply for Building Regulations approval
  6. gov.uk — party walls and building work
  7. Party Wall etc. Act 1996
  8. HSE — CDM 2015: domestic clients
  9. HSE — deciding if asbestos work must be done by a licensed contractor
  10. Consumer Rights Act 2015, section 49 — reasonable care and skill
  11. Consumer Rights Act 2015, section 54 — what you can ask for when a service falls short
  12. Consumer Contracts Regulations 2013, regulation 30 — the 14-day cancellation period
  13. Consumer Contracts Regulations 2013, regulation 28 — contracts the cancellation right does not cover
  14. Consumer Contracts Regulations 2013, regulation 36 — services started within the cancellation period
  15. Civil Procedure Rules Part 26 — the small claims track limit (England and Wales)
  16. Scottish Courts and Tribunals — making a claim under simple procedure
  17. nidirect — the small claims process (Northern Ireland)
  18. Buildings and construction (VAT Notice 708) — 2.1 Construction services: work to an existing building is normally standard-rated
  19. GOV.UK — VAT rates
  20. GOV.UK — Register for VAT: when to register