Chiswick · W4
Loft Conversions in Chiswick
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 Chiswick: what to know locally
High-value Victorian and Edwardian terraces and semis, including the Bedford Park estate and the grid streets off Chiswick High Road.
Chiswick properties carry high values, so the specification expectation is correspondingly high — sash window matching, proper brick selection and detailing that stands up to close inspection. Much of the area sits in conservation designation.
Planning authority: Hounslow Council. Hounslow applies strict conservation controls across much of Chiswick, and Bedford Park in particular has detailed design guidance. Anything affecting the front elevation almost always needs permission.
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 Chiswick
Loft Conversions nearby
Loft Conversions in Chiswick — questions
Do you cover Chiswick?
Yes — Chiswick and the W4 postcodes are part of our core working area, along with Acton, Hammersmith, Ealing. Being local means a site visit within days rather than weeks.
Which council handles planning for Chiswick?
Hounslow Council. Hounslow applies strict conservation controls across much of Chiswick, and Bedford Park in particular has detailed design guidance. Anything affecting the front elevation almost always needs permission.
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 Chiswick?
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.