Loft conversions in the UK
Velux, dormer, hip-to-gable and mansard conversions.
- Towns and cities
- 56
- Velux / rooflight from
- £25,000
- Accreditations explained
- 3
- Velux / rooflight
- £25,000 – £35,000no roof structure change
- Dormer
- £40,000 – £60,000the most common UK conversion
- Hip to gable
- £45,000 – £70,000semi and end terrace
- Mansard
- £55,000 – £85,000usually needs planning
Typical UK ranges for 2026, excluding VAT. Local figures on each city page are adjusted for regional labour rates.
Loft conversions by town and city
56 towns and cities, each listing up to 10 firms from Google's results for that town, ranked on Google rating, online presence and other factors.
Launch cities
- Loft conversions in LondonGreater London
- Loft conversions in BirminghamWest Midlands
- Loft conversions in ManchesterGreater Manchester
- Loft conversions in LeedsWest Yorkshire
- Loft conversions in BristolBristol
- Loft conversions in LiverpoolMerseyside
- Loft conversions in SheffieldSouth Yorkshire
- Loft conversions in NottinghamNottinghamshire
- Loft conversions in CoventryWest Midlands
- Loft conversions in LeicesterLeicestershire
- Loft conversions in DerbyDerbyshire
- Loft conversions in SouthamptonHampshire
- Loft conversions in CroydonGreater London
Everywhere else
- EdinburghCity of Edinburgh
- GlasgowGlasgow City
- CardiffCardiff
- AberdeenAberdeen City
- YorkNorth Yorkshire
- NorthamptonNorthamptonshire
- NorwichNorfolk
- OxfordOxfordshire
- PlymouthDevon
- BrightonEast Sussex
- BelfastCounty Antrim
- NewcastleTyne and Wear
- WolverhamptonWest Midlands
- CambridgeCambridgeshire
- Stoke-on-TrentStaffordshire
- Milton KeynesBuckinghamshire
- BlackpoolLancashire
- BathSomerset
- SwindonWiltshire
- ColchesterEssex
- DoncasterSouth Yorkshire
- CheltenhamGloucestershire
- ExeterDevon
- GloucesterGloucestershire
- SwanseaSwansea
- St AlbansHertfordshire
- PortsmouthHampshire
- BromleyGreater London
- EnfieldGreater London
- HarrowGreater London
- RomfordGreater London
- EalingGreater London
- BarnetGreater London
- RichmondGreater London
- North LondonGreater London
- East LondonGreater London
- South LondonGreater London
- West LondonGreater London
- FulhamGreater London
- WimbledonGreater London
- WandsworthGreater London
- ChiswickGreater London
- ClaphamGreater London
What the badges actually mean
The accreditations that matter for loft conversions, in plain English.
Federation of Master Builders
Independently inspected and vetted before joining.
TrustMark registered
The only government-endorsed quality scheme for work in and around the home. Covers trading standards as well as technical competence.
CHAS accredited
Health and safety pre-qualification. Matters most on structural work and anything involving scaffolding.
Before you get quotes
Work out the budget and the paperwork first. It changes the conversation you have with the firm.
How much does a loft conversion cost in 2026?
Loft conversion prices by type for 2026, including VAT, with London figures, the fees and extras a builder's quote leaves out, and when planning permission applies.
Loft conversion: do you need planning permission?
When a loft conversion needs planning permission in England, the 40 and 50 cubic metre limits for dormers, what a certificate costs, and the rules in Wales, Scotland and Northern Ireland.
Dormer loft conversions: the complete guide
What a dormer loft conversion costs in 2026, the dormer types, whether your loft has the height, the planning and building regulations rules in each nation, and how long it takes.
Hip to gable loft conversions: cost, planning and what to know
What a hip to gable loft conversion costs in 2026, which houses can take one, the steel it needs, how it uses the volume allowance, the rules in each nation and how it compares with a dormer.
Velux loft conversions: the cheapest way into your roof
What a velux loft conversion costs in 2026, whether your loft has the height, the planning rules for roof windows in each UK nation, the building regulations and how long the work takes.
Mansard loft conversions: cost, planning and mansard vs dormer
What a mansard loft conversion is, what it costs in 2026, which houses suit one, the planning and design rules councils apply, and how it compares with a dormer.
Types of loft conversion: the four main types, compared
Rooflight, dormer, hip to gable and mansard conversions side by side: what each changes on the roof, 2026 prices and build times, planning in England, and which houses suit each.
Loft conversions: common questions
Do I need planning permission for a loft conversion?
Usually not. Most fall under permitted development if you stay within 40 cubic metres for a terrace or 50 for a semi or detached, do not go above the existing roof ridge, and use materials in keeping. Mansards and anything on a flat or in a conservation area normally do need permission.
How long does a loft conversion take?
Six to eight weeks for a dormer once work starts, plus four to eight weeks beforehand for drawings, structural calculations and building control. Scaffolding usually goes up a week ahead.