Loft Conversion Quotes
From Vetted UK Loft Conversion Specialists
Get matched with vetted loft conversion specialists in your area — and see which are FMB or CIOB members before you choose. Dormer, hip-to-gable and mansard conversions — up to 3 free quotes in 24 hours, across 519 towns.
- Every specialist vetted before they can quote on your job
- Dormer loft conversions from £30,000 nationally
- Hip-to-gable conversions from £33,000 nationally
- Completely free — no obligation to proceed
What do you need?
Every loft type and job has its own page with the full 2026 price ranges, what moves the number, and a quote form matched to that exact job — so your enquiry reaches the right supplier.
Loft conversion costs at a glance — 2026
Typical UK price ranges by conversion type, from the cost cards above.
Source: BestBuilders 2026 quote data · 519 UK towns
How Much Does a Loft Conversion Cost in the UK?
Full cost guide →The most popular type in the UK. Creates a full-height room with a vertical rear wall and flat roof. Usually includes a bathroom and Velux windows to the front.
Get quotes for this →Ideal for end-of-terrace and detached homes with a hipped roof. Extends the ridge line to create maximum usable floor space. Often paired with a rear dormer.
Get quotes for this →The most spacious conversion type — a near-vertical rear wall with a shallow-pitched roof. Common in London and city terraces. Typically requires planning permission.
Get quotes for this →Costs vary by conversion type, roof structure, specification and region. Compare 3 quotes from vetted local loft conversion specialists.
Get free quotes →Regional pricing note: Loft conversion costs are higher in London and the South East. Mansard conversions in inner London can exceed national averages by 35–45%. Use our local cost guide for town-specific ranges.
Convert Your Loft With a Vetted Specialist
A loft conversion is one of the best-value home improvements you can make in the UK. It adds a full habitable room — typically a bedroom with en-suite — without taking any garden space, and consistently delivers strong returns in almost every UK property market.
Getting it right requires a specialist who understands structural engineering, roof types, permitted development rules, party wall requirements and building regulations. BestBuilders connects you with vetted loft conversion specialists who work on your property type and roof configuration. Scheme membership — FMB, CIOB or similar — is worth asking about and free to check on their registers.
Every specialist in our network is vetted before they receive a single lead from us. We do not check insurance or trade certification on your behalf, so ask to see current public liability cover and any scheme membership before work starts — FMB and CIOB both publish free online registers.
How we vet specialists →How It Works
Every Specialist We List Is:
Which Loft Conversion Suits Your Property?
The right conversion type depends on your roof shape, property type and planning context. Here's a guide to help you narrow it down.
Terraced & semi-detached houses
A rear dormer is the most common choice — it maximises usable floor area without affecting the front roofline. Victorian and Edwardian terraces with steep pitched roofs are ideal candidates. A Velux conversion is cheaper but suits taller roofs with sufficient existing headroom.
End-of-terrace & detached homes
If your home has a hipped roof (where the roof slopes on all four sides rather than having a gable end), a hip-to-gable conversion is the most effective way to maximise space. It's usually combined with a rear dormer for the best result. Most hip-to-gable conversions fall under Permitted Development.
London terraces & city properties
A mansard conversion creates the most usable space — the rear roof slope is replaced with a near-vertical wall, transforming the entire loft into a full-height room. Common in London mid-terraces and conservation area properties. Typically requires planning permission but delivers the biggest floor area gain.
Not sure which type suits your home?
Select "Not sure yet" in the quote form and describe your property type. The specialists we match you with will assess your roof during the site visit and recommend the most suitable conversion — without any obligation to proceed.
What's Typically Included in a Loft Conversion
🏗 Structural work
🚿 Plumbing & electrics
🪟 Finishing
Loft Conversion Cost by Type and Region (2026)
Live cost ranges from the Best Builders 2026 Cost Index, aggregated across 519 UK towns. Mid-spec finish; excludes architectural and structural engineering fees, kitchen/bathroom fit-out beyond standard spec, and premium glazing or balcony additions.
| Region | Dormer | Hip-to-Gable | Mansard |
|---|---|---|---|
| London | £47,000 – £81,000 | £51,500 – £93,000 | £59,000 – £113,000 |
| South East | £42,000 – £72,000 | £46,000 – £83,000 | £53,000 – £101,000 |
| Southern | £38,000 – £66,000 | £42,000 – £76,000 | £48,000 – £92,000 |
| Eastern | £37,000 – £64,000 | £40,500 – £73,500 | £46,000 – £90,000 |
| West Midlands | £35,000 – £60,000 | £38,500 – £69,000 | £44,000 – £84,000 |
| East Midlands | £35,000 – £60,000 | £38,500 – £69,000 | £44,000 – £84,000 |
| Yorkshire | £33,000 – £57,000 | £36,500 – £65,500 | £41,000 – £80,000 |
| North West | £33,000 – £57,000 | £36,500 – £65,500 | £41,000 – £80,000 |
| South West | £32,000 – £55,000 | £35,000 – £63,500 | £40,000 – £77,000 |
| North East | £31,000 – £54,000 | £34,000 – £62,000 | £39,000 – £76,000 |
| Scotland (North) | £32,000 – £55,000 | £35,000 – £63,500 | £40,000 – £77,000 |
| Scotland (South) | £32,000 – £55,000 | £35,000 – £63,500 | £40,000 – £77,000 |
| South Wales | £30,000 – £52,000 | £33,000 – £60,000 | £38,000 – £73,000 |
| Merseyside & N. Wales | £30,000 – £52,000 | £33,000 – £60,000 | £38,000 – £73,000 |
Source: Best Builders 2026 Cost Index · aggregated quote data, refreshed quarterly · Mansard conversions consistently command the highest premium (around 25–35% above dormer equivalents) due to extensive roof rebuild work and London-area planning constraints. See full cost index →
How to check a loft conversion specialist before you commit
We match you with local trades and step back — the hiring decision is yours. These are the checks that separate a good loft conversion specialist from an expensive mistake, and they take about ten minutes.
Get the quote in writing
An itemised written quote covering labour, materials, waste removal and VAT — not a figure over the phone. If two quotes differ a lot, it is usually because they cover different work, and only the written detail shows you where.
Check the insurance yourself
Ask for the public liability certificate and check the policy is current and in the same trading name as the quote. A logo on a van or a website is not evidence. If the work is notifiable, ask who is registering it.
Ask for recent local work
Two or three jobs of the same type from the last six months, close enough to go and look at. Someone who does good work will offer these before you ask. Be wary of anyone who only has photographs.
On payment: never pay the full amount up front. A deposit against materials is normal; after that, stage payments against completed work are the standard arrangement. Pressure to pay in cash, in full, or on the day is the single most common warning sign.
Loft Conversion Specialists Across 519 UK Towns
Each town page shows local loft specialists, town-specific cost ranges and nearby areas.
Loft Conversion FAQs
Question this page didn't answer?
Ask a specific question about your loft conversion project. A member of our editorial team will answer and publish it (your email is never shown).
Complete your project
Homeowners planning loft conversion often line up these trades too — get free, no-obligation quotes in the same few clicks.
Our sources for this guide
Cost ranges, timelines and regulatory information on this page are compiled from:
- Best Builders 2026 Cost Index — regional loft-conversion cost ranges aggregated from active quote requests across 519 UK towns, refreshed quarterly
- Federation of Master Builders — loft conversion cost guidance
- RICS Building Cost Information Service (BCIS) — Q2 2026 UK construction cost data
- Planning Portal — Loft Conversions & Permitted Development
- UK Building Regulations Approved Document B (Fire Safety)
- UK Building Regulations Approved Document L (Energy / Insulation)
- GOV.UK — Party walls and building works
Editorial standards & how to reach us
This page is maintained by the Best Builders editorial team. Cost figures are reviewed quarterly against active quote data from our verified UK builder network. Regulatory information (planning, Building Regs Part B and Part L, Party Wall) is checked against current UK government guidance at each refresh. We do not accept payment for editorial coverage; builder listings are earned through our vetting process.
If you spot an error or have feedback, email editorial@bestbuilders.co.uk.
Last updated: 23 May 2026 · Next scheduled review: 23 August 2026