For loft conversion companies
Loft conversion companies: get found by homeowners planning a loft conversion, when our map opens in your area
Sign-up for loft conversion companies opens soon. Listing will be free while we build the map, with at least 30 days’ notice before any charge.
Many homeowners price the job on Estiquote before they ask for quotes. When our map opens in their area, they’ll search it for “a loft conversion” and see the loft conversion companies who cover it.
Homeowners see £47,000 to £58,000 for a 30 m² rear dormer loft conversion before they ask you. Building work, mid-range finish, UK average outside London, including VAT, prices reviewed 25 September 2026. The cost guide.
Firm sign-up opens soon. Email support@estiquote.co.uk with your firm's name and trade, and we'll tell you the day it opens.
What homeowners see before they ask you
| Job | Building work, UK average | Building work, London |
|---|---|---|
| Loft conversion: Rooflight (Velux), about 30 m² | £27,000 to £35,000 | £36,500 to £47,500 |
| Loft conversion: Rear dormer, about 30 m² | £47,000 to £58,000 | £63,500 to £78,500 |
| Loft conversion: L-shaped dormer, about 30 m² | £55,000 to £68,000 | £74,000 to £92,000 |
| Loft conversion: Hip-to-gable (with rear dormer), about 30 m² | £55,000 to £68,000 | £74,000 to £92,000 |
| Loft conversion: Double hip-to-gable (with rear dormer), about 30 m² | £63,000 to £78,000 | £85,000 to £105,000 |
| Loft conversion: Mansard, about 30 m² | £65,000 to £85,000 | £88,000 to £115,000 |
| Region | Building work |
|---|---|
| UK average (outside London) | £47,000 to £58,000 |
| London | £63,500 to £78,500 |
| South East | £54,000 to £66,500 |
| East of England | £50,500 to £62,000 |
| South West | £49,000 to £60,500 |
| West Midlands | £45,500 to £56,500 |
| East Midlands | £44,500 to £55,000 |
| Scotland | £44,500 to £55,000 |
| North West | £43,500 to £54,000 |
| Yorkshire and the Humber | £43,000 to £53,500 |
| Wales | £42,500 to £52,000 |
| North East | £41,500 to £51,000 |
| Northern Ireland | £38,500 to £47,500 |
| Fee | Typical range |
|---|---|
| Design drawings (planning and building regulations) | £2,400 to £5,400 |
| Structural engineer | £720 to £2,200 |
| Building control (council, full plans) | £750 to £1,000 |
| Lawful development certificate (England) (only if needed) | £274 |
| Party wall surveyor (per neighbour, one surveyor agreed by both sides) (only if needed) | £1,100 to £1,800 |
What homeowners ask loft conversion companies
With what our guides tell them. Answer these in your quote, and later on your listing.
Are the staircase and fire safety in the price?
Our loft quote guide lists the new staircase and fire protection to the stairs and escape route among the items most often left out or priced separately. Show them as lines in your quote.
Are drawings and calculations already in your price?
Homeowners are told many loft companies offer design and build, and to ask. On its own, our guide puts design drawings at about £2,400 to £5,400 and a structural engineer at about £720 to £2,200, including VAT.
Which type of loft conversion is it?
Homeowners compare rooflight, rear dormer, L-shaped dormer, hip to gable, double hip to gable and mansard conversions in our loft cost guide. A rear dormer of about 30 m² is about £47,000 to £58,000, an L-shaped dormer about £55,000 to £68,000 and a mansard about £65,000 to £85,000, building work including VAT.
What homeowners will ask you to confirm
From the checklist in our loft conversion guide:
- Survey and design: Measured survey, headroom check, drawings and structural calculations. Ask whether drawings are already in a design and build price.
- Permissions: Permitted development or planning, building control and party wall notices.
- Structure: New floor joists (the beams that carry the new floor), steel beams, any work to the wall plates (the timbers along the top of the walls that the roof sits on) and dormer framing.
- Stairs and fire safety: Staircase position and headroom, what any PC sum for the staircase covers (supply only, or fitted too), protected escape route and fire doors.
- Windows: Rooflights, dormer windows and any escape window.
- Services and finishes: Heating, electrics, insulation, plastering and decoration, and making good the rooms below.
- Bathroom: En-suite plumbing and drainage, if wanted.
- Often extra: Chimney breast, water tank, hot water cylinder, boiler, asbestos and an old fuse board.
What we’ll check before loft conversion companies appear
- Companies House, if you’re a limited company or LLP: we’ll check the company is active.
- Only if you take waste away: Waste carrier registration. The law and the registers
- Who runs the business: an ID check, or a code letter for a company’s director.
Badges you can add (not needed to appear): TrustMark and Federation of Master Builders, and insurance.
Your listing will say, for example: Checked by Estiquote on 30 October 2026:
If you’re a limited company
- Active company at Companies House
If you’re a sole trader
- Sole trader: business details checked by Estiquote
How to list
When sign-up opens for loft conversion companies, have ready your company number if you’re a limited company, your waste carrier registration number if you take waste away. Then you’ll create your account and send your profile for checks; we’ll usually reply within 5 working days.
Homeowners will choose up to 3 firms by name, and reviews will come only from real jobs, checked by a person: how quote requests and reviews will work.
Firm sign-up opens soon. Email support@estiquote.co.uk with your firm's name and trade, and we'll tell you the day it opens.
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