Cost FAQ
How much does a loft conversion cost in London?
Build: £45,000-£75,000 dormer, £65,000-£95,000 hip-to-gable, £78,000-£110,000 mansard, £22,000-£40,000 Velux-only.
Build: £45,000-£75,000 dormer, £65,000-£95,000 hip-to-gable, £78,000-£110,000 mansard, £22,000-£40,000 Velux-only.
A London loft conversion typically costs £45,000 to £75,000 for a rear dormer with a bedroom and shower room, and £70,000 to £110,000 for a mansard. Those are build costs.
Roof type first. A rooflight-only conversion is the cheapest because no structural roof alteration is needed. A rear dormer adds structure, a new floor and a weathered box. A hip-to-gable plus dormer adds a new gable wall. A mansard means removing and rebuilding the roof entirely, which is why it roughly doubles the cost.
After that: staircase position, whether a steel is needed to carry the new floor, the number of bathrooms, and whether the roof covering has to be natural slate to satisfy a conservation condition.
Planning £548 where an application is needed, or £274 for a Lawful Development Certificate where it is not. Building control £500 to £1,200. A party wall award commonly £900 to £1,400 per neighbour — and a terraced loft usually engages two.
Three places. Unexpected structure — trussed rafters that have to be replaced rather than trimmed. Services — moving a boiler, a soil stack or a water tank that occupies the space the shower room needs. And the staircase, because taking the new flight off a small landing often means reconfiguring the floor below.
In London an additional bedroom and bathroom in the roof is one of the more reliable improvements, though the return depends entirely on the local ceiling price. The planning route matters here too: an approval or a Lawful Development Certificate on file is what a buyer's solicitor will ask for.
How how much does a loft conversion cost in london? plays out in Wandsworth: London Borough of Wandsworth (Wandsworth Council) maintains 45 conservation areas, the Wandsworth Common Conservation Area and the Clapham Common West Conservation Area among them, and an Article 4 direction is in force there, so permitted development cannot be assumed. Anyone dealing with how much does a loft conversion cost in london? at a Wandsworth address is therefore working to a £548 householder application decided in 8 weeks, or a £249 prior approval over 6 weeks where how much does a loft conversion cost in london? still qualifies. are the Town and Country Planning Act 1990, the GPDO 2015 and the Building Regulations 2010.
| Rear dormer, London build cost | £45,000–£75,000 |
|---|---|
| Mansard, London build cost | £70,000–£110,000 |
| Our loft drawing package | |
| Planning fee | £548, or £274 for an LDC |
| Building control | £500–£1,200 |
| Structural calculations |
Build cost ranges here are indicative market ranges; confirm with your contractor whether their quote includes VAT.
The existing roof is removed and rebuilt, and the party walls are raised.
No. We fix the drawing and submission fee; the build is contracted separately.
Pick a slot that suits you. No obligation and no sales pressure, just straight answers on your planning route.
