Loft Conversions in Wembley & Greater London
An extra bedroom and bathroom without losing garden. We build dormer, hip-to-gable, L-shaped and Velux conversions that feel like part of the house rather than a converted attic.
Types of loft conversions we build
Rear dormer
The most space for the money on a terrace or semi — full standing height across the rear.
Hip-to-gable
Squaring off a hipped roof on a semi or end-terrace to create usable width, usually with a rear dormer too.
L-shaped dormer
Dormer over the main roof and the rear outrigger — typically a large bedroom plus en-suite.
Velux / rooflight conversion
No change to the roof shape, so the lowest cost and least disruption where head height already works.
Mansard
A near-vertical rear roof giving the most volume; usually needs full planning permission.
Planning & Building Control
- Dormer and hip-to-gable conversions often fall under permitted development within volume limits (40m³ terrace, 50m³ semi or detached).
- Mansards, front-facing dormers, conservation areas and flats need full planning permission.
- Building Control approval is always required — fire escape, structure and insulation are checked.
- A protected escape route from the loft to the front door is mandatory, usually meaning fire doors to every room off the stairs.
- Party wall notices apply where steels bear into a shared wall.
Structural work
- Steel beams spanning to the party walls to carry new floor joists
- New floor structure independent of the existing ceiling joists
- Dormer framing, trimming and roof alterations
- Staircase design meeting Part K headroom and pitch
- Insulation upgrade to current Part L, warm or cold roof build-up
The typical process
- 01
Feasibility visit
We measure the head height, look at the roof structure and tell you honestly which conversion type your house suits.
- 02
Design, calcs and consents
Drawings, structural calculations, planning or a lawful development certificate, and Building Control.
- 03
Fixed-price contract
Written specification and programme with a start and finish date.
- 04
Scaffold and structure
Scaffolding, roof opening, steels, floor and dormer — the noisy fortnight.
- 05
Weathertight and first fix
Roofing, windows, electrics, plumbing, insulation and plasterboard.
- 06
Staircase and second fix
Stairs formed, en-suite fitted, joinery and eaves storage built in.
- 07
Decoration and sign-off
Decoration, snagging, Building Control completion certificate and warranty.
Materials & finishes
- Zinc, single-ply or GRP dormer cladding and flat roofing
- Velux and conservation rooflights
- Rigid PIR and mineral wool insulation to Part L
- Bespoke eaves storage, wardrobes and stair joinery
- Compact en-suites with concealed cisterns and low-profile trays
Typical programme
- Design and consents
- 6–12 weeks
- Velux conversion
- 6–8 weeks on site
- Rear dormer
- 8–11 weeks on site
- Hip-to-gable with dormer / L-shape
- 10–14 weeks on site
Indicative only — we confirm dates in writing before any work starts.
What drives the cost
- Conversion type and how much of the roof is rebuilt
- Where the staircase lands and how much of the floor below is altered
- Whether an en-suite is included and how far the drainage has to run
- Existing roof condition and whether it needs re-tiling
- Fire door and escape upgrades to the rest of the house
- Scaffold duration and access to the rear
We don't publish prices, because a fair figure depends on your property and specification. Send us your drawings or a short description and we'll come back within two working days with an indicative range.
Questions we get asked
Is my loft tall enough?
As a rule of thumb you want about 2.2m from the top of the ceiling joist to the underside of the ridge. Less than that and a dormer or mansard may still work — we'll measure and tell you straight.
Will I lose a bedroom to the staircase?
Usually not. On most terraces the stairs run over the existing flight, taking a slice off the landing rather than a whole room.
Can we live in the house during the work?
Yes, for most of it. The first two or three weeks are noisy, and there's a day or two of dust when the stairs are opened up, but the loft is worked on from the scaffold until then.
Do I need planning permission?
Often no — most rear dormers and hip-to-gables are permitted development. We recommend a lawful development certificate anyway, as buyers' solicitors ask for it.
Portfolio shared on request
We only publish project photography we have the homeowner's permission to share. Ask us and we'll send a selection of recent work relevant to your project.
Get in touch
Planning loft conversions in Wembley or Greater London?
Tell us what you're planning and we'll come back within two working days with next steps and an indicative budget range.