The London Loft Conversion Company designs and builds loft conversions across Hammersmith W6, around 10 minutes from our Fulham base. One in-house team for feasibility, design, planning, structural engineering and the build itself. One fixed price, VAT included, written contract.
Hammersmith is a patchwork of Victorian streets built between the 1870s and 1890s, from the two-storey cottages of Brackenbury Village to the bay-fronted terraces between King Street and Goldhawk Road. Most have a rear back addition ("outrigger") and a mid-pitch rear roof slope, which is exactly the stock that suits L-shaped dormers and rear dormers best. The exceptions are the mansion flats along King Street, Shepherd's Bush Road and Fulham Palace Road, which can often still be converted but always need full planning permission.
Planning sits with a single authority, Hammersmith & Fulham Council, which keeps approvals simpler than in areas split across two boroughs. Full applications typically take 8–10 weeks; Lawful Development Certificates are usually decided in around 6. The Brackenbury Village conservation area covers the cottage streets around Brackenbury Road, and riverside conservation stretches run along Upper Mall, so on those streets a mansard or a low-impact Velux conversion is often the smarter route.
We're around 10 minutes by road from our Fulham base, which makes Hammersmith the closest area we build in. That proximity means same-day or next-working-day survey visits across W6, and a site manager who can be at your door quickly at every stage of the build.
A selection of dormer, L-shaped and mansard projects we've delivered in W6, labelled clearly so you can see whether the build was through The London Loft Conversion Company or our parent company, Pillarstone Operations Group.
Rear mansard creating a main bedroom and en-suite on a Victorian cottage terrace in the heart of Brackenbury Village, with a full heritage statement as part of the application.
L-shaped dormer built over the rear outrigger, adding a master bedroom and a full bathroom to a Victorian mid-terrace.
Rear dormer with a double bedroom and walk-in shower on a Victorian terrace just off Hammersmith Grove.
Rear dormer creating two bedrooms with a reconfigured landing on a bay-fronted Victorian terrace.
L-shaped dormer adding a main bedroom and home office to a Victorian terrace in the riverside streets of south W6.
Rear dormer with a guest bedroom and study, completed with scaffold access from the rear to keep the street unobstructed.
Hammersmith's housing splits into a few clear types, from Brackenbury cottages to bay-fronted terraces and mansion flats. Here's the short version.
Most Victorian terraces in W6 have a rear back addition ("outrigger"), which is exactly where an L-shaped dormer sits. Adds two rooms, usually a master bedroom and a generous bathroom, within permitted development on the majority of houses outside the conservation areas.
£68,000 – £84,000
Read more about l-shaped dormersWhere Brackenbury Village or the riverside conservation stretches around Upper Mall restrict rear dormers, a mansard rebuilds the rear roof at a steep angle and creates a full new storey with vertical walls inside. The highest-spec option for the period stock closest to the river and Ravenscourt Park.
£78,000 – £105,000
Read more about mansardsThe most cost-effective option for the terraces between King Street and Goldhawk Road and the streets either side of Hammersmith Grove. Usually permitted development, with a finished cost typically £56k–£72k for a master bedroom and en-suite.
£56,000 – £72,000
Read more about rear dormersWe handle every part of this as part of your fixed quote: Lawful Development Certificates, full planning applications, Design and Access Statements, conservation heritage statements, council liaison and responding to planning officer queries. You don't deal with the council, we do.
Hammersmith sits in the upper bracket of London loft conversion costs because of the prevalence of period properties, the conservation oversight on the Brackenbury and riverside streets, and the finish expectations W6 homeowners typically have. The ranges below are 2026 figures for Victorian terraces and cottages in W6. Final quotes are confirmed in writing after a free home survey.
| Type | Typical range | Build time | Planning |
|---|---|---|---|
| Velux | £42,000 – £52,000 | 6–8 weeks | Usually permitted development |
| Dormer | £56,000 – £72,000 | 8–10 weeks | Usually permitted development |
| L-Shaped Dormer | £68,000 – £84,000 | 10–12 weeks | Often permitted development |
| Hip-to-Gable | Less common in W6 | 10–12 weeks | Usually permitted development |
| Mansard | £78,000 – £105,000 | 12–16 weeks | Planning permission required |
VAT included. Final price varies with structural complexity, spec and finish. Your proposal is itemised line by line before any commitment.
Book a free survey for your Hammersmith quoteWe were nervous about committing to such a big project, but the team made it the smoothest experience. They stayed on budget, finished a week early and even sorted the snags before we'd noticed them. Our bedroom is the best room in the house now.
Sarah & Tom
L-shaped dormer · Clapham
From the first survey to handover, everything happened when they said it would. The fixed price genuinely was fixed, and the weekly photo updates meant we always knew exactly where the build was. The dormer has completely changed how we use the house.
James R.
Rear dormer · Wandsworth
Our loft was a dumping ground for ten years and now it's the nicest room we own. The crew were tidy, polite and honest about what was possible, and the finish is better than we dared hope for.
Rebecca H.
Mansard · Fulham
Loft conversions in Hammersmith typically cost £56,000 to £105,000 depending on the type and the property. A standard rear dormer on a Victorian terrace usually falls between £56,000 and £72,000. L-shaped dormers, common on terraces with a rear outrigger, run £68,000 to £84,000. Mansards, often the right route in Brackenbury Village and near the river, are £78,000 to £105,000, while a Velux conversion starts at around £42,000. Every figure is VAT included and confirmed in writing after a free home survey.
Often not, if you own a house. Rear dormers and L-shaped dormers on Hammersmith houses usually fall under permitted development, needing only a Lawful Development Certificate. You will need planning permission for a mansard, for any conversion of a flat or maisonette, and for most work in the Brackenbury Village conservation area or the riverside streets around Upper Mall. We assess your street's exact position at the free survey and handle whichever route applies.
A full planning application typically takes 8 to 10 weeks with Hammersmith & Fulham Council. A Lawful Development Certificate, which is all most W6 dormer conversions need, is usually decided in around 6 weeks. We prepare and submit everything, deal with any planning officer queries, and build the approval time into your project programme.
Sometimes, if you own the top-floor flat and can secure the loft space. Flats and maisonettes have no permitted development rights, so a full planning application to Hammersmith & Fulham Council is always required, and you will also need freeholder consent and usually a licence to alter under your lease. We review the lease position alongside the structural feasibility at the survey stage.
Usually, yes, but the type changes. Rear dormers face closer scrutiny in the Brackenbury Village conservation area and the riverside stretches around Upper Mall, so a sympathetic mansard or a low-impact Velux conversion is often the recommended route. We prepare the heritage statement and full planning application as part of the fixed quote.
Faster than anywhere else we cover. Our base is in Fulham, around 10 minutes from Hammersmith by road, so survey visits in W6 are usually same day or next working day. After the visit you get a fully itemised fixed-price proposal within 7 days, with no pressure to proceed.
Don't see Hammersmith as your nearest postcode? We work across London. Most of our work comes from referrals between neighbouring streets.
Looking for a specific postcode? See all the South London areas we cover or West London areas.
Tell us your postcode and a bit about your house. Daniel will arrange a free home survey, usually within 3 working days in W6, and you'll have a fully itemised fixed-price proposal within 7 days of the visit. No pressure, no obligation, no hard sell.
Prefer to talk? Call Daniel on 07414 648 263.
