Harrow · HA1, HA2, HA3
Loft Conversions in Harrow
Dormer, hip-to-gable, mansard or a simple Velux conversion — including the staircase, the fire-rated doors and the building control certificate that makes it count as a bedroom when you sell.
A loft is only a bedroom if it is signed off as one. That means head height, a protected escape route, fire doors on the landing, mains-wired interlinked alarms and floor joists sized for living load rather than storage. We see plenty of conversions done without any of it, and they become a problem at survey. Every conversion we do goes through building control from the start.
Loft Conversions in Harrow: what to know locally
Predominantly 1930s semi-detached and detached suburban housing, with larger plots and generous rear gardens compared with the inner West London boroughs.
The 1930s semi is the ideal loft conversion candidate — hip-to-gable plus a rear dormer transforms the roof space entirely, and the plot depth usually leaves room for a decent rear extension as well. Drives are often original and overdue replacement.
Planning authority: Harrow Council. Harrow is generally more permissive than the inner boroughs for rear extensions and loft conversions, with much of the suburban stock retaining full permitted development rights. Still worth checking for Article 4 coverage.
What the work covers
- Structural floor joists and steel beams
- Dormer construction or roof reconfiguration
- Staircase design and installation
- Fire doors, protected escape route and interlinked alarms
- Insulation to current regs, electrics and heating
- En-suite plumbing where wanted
What it costs
A dormer conversion with an en-suite typically runs £55,000 to £85,000 in West London. Velux-only conversions are considerably less; mansards more. The roof structure drives the price more than the floor area does.
Other work we do in Harrow
Loft Conversions nearby
Loft Conversions in Harrow — questions
Do you cover Harrow?
Yes — Harrow and the HA1, HA2, HA3 postcodes are part of our core working area, along with Wembley, Greenford, Kensal. Being local means a site visit within days rather than weeks.
Which council handles planning for Harrow?
Harrow Council. Harrow is generally more permissive than the inner boroughs for rear extensions and loft conversions, with much of the suburban stock retaining full permitted development rights. Still worth checking for Article 4 coverage.
Is my loft tall enough to convert?
You want roughly 2.2 metres from the floor joists to the ridge before work starts. Below that it can still be possible by lowering ceilings below or altering the roof, but it changes the job substantially. We measure on the first visit.
Do I need planning permission for a loft conversion?
Rear dormers often sit within permitted development, subject to volume limits of 40 cubic metres for terraces and 50 for semis and detached. Anything facing a highway, or in a conservation area, usually needs an application.
Does a loft conversion need building regulations approval?
Always. Structure, fire escape, insulation and stairs are all covered. Without the certificate your conveyancer will flag it as an unsigned-off room when you come to sell, which costs you more than the sign-off would have.
Loft Conversions in Harrow?
Tell us about the property and what you have in mind. We will come out, measure it properly, and put a written itemised quote in front of you.
We reply to every quote request within 24 hours.