Duke Road, Chiswick W4
Rear dormer adding a master bedroom and en-suite to a Victorian cottage terrace on the Glebe Estate.
- Dormer
- 9 weeks
- £66k
- Hounslow Council
- Delivered by us
Loft Conversions in Chiswick W4
The London Loft Conversion Company designs and builds loft conversions across Chiswick and the wider W4 postcode, around 15 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.
- Typical project
- £58k–£72k, 8–12 weeks
- Area
- Chiswick W4
- Local council
- Hounslow
- Best for
- Victorian terraces and Edwardian semis
Why Chiswick is one of the best parts of London for a loft conversion
Chiswick splits into three distinct pockets of housing, and all three convert well. The Victorian cottage terraces of the Glebe Estate, built in the 1870s and 1880s, have the classic rear outriggers that suit L-shaped dormers and rear dormers. The grander Edwardian semis around Grove Park carry generous hipped roofs with real volume inside. And Bedford Park adds a third character entirely, with steep Norman Shaw roofs on the world's first garden suburb.
Planning sits with Hounslow Council across W4. A full application typically takes 8–10 weeks; Lawful Development Certificates are faster, usually around 6 weeks. The Bedford Park Conservation Area is the one to plan around: Article 4 directions remove permitted development rights, roof alterations are tightly controlled, and a sensitively detailed mansard or a low-impact Velux conversion is often the route the conservation officers will support.
We're around 15 minutes by road from our Fulham base, straight over Hammersmith and the A4, which means same-day or next-working-day survey visits across Chiswick. Much of our W4 work has come through neighbour referrals. Once one house on a street is done, the next one or two tend to follow.
Recent loft conversions in Chiswick
A selection of dormer, L-shaped and mansard projects we've delivered across W4, labelled clearly so you can see whether the build was through The London Loft Conversion Company or our parent company, Pillarstone Operations Group.
Blenheim Road, Bedford Park W4
Rear mansard on an Edwardian house within the Bedford Park conservation area, approved with a full heritage statement.
- Mansard
- 14 weeks
- £94k
- Hounslow Council
- Delivered by us
Cranbrook Road, Chiswick W4
L-shaped rear dormer over the outrigger of a Victorian mid-terrace near Turnham Green, adding a bedroom and study.
- L-Shaped Dormer
- 11 weeks
- £74k
- Hounslow Council
- Delivered by us
Fauconberg Road, Chiswick W4
Rear dormer with double bedroom and walk-in shower on an Edwardian house between Sutton Court and Chiswick House.
- Dormer
- 10 weeks
- £69k
- Hounslow Council
- Group-delivered
Airedale Avenue, Chiswick W4
Full mansard creating a top-floor master suite on a tall Victorian terrace off Chiswick High Road.
- Mansard
- 15 weeks
- £99k
- Hounslow Council
- Group-delivered
Balfern Grove, Chiswick W4
L-shaped dormer creating a master bedroom, dressing area and bathroom on a Glebe Estate terrace.
- L-Shaped Dormer
- 12 weeks
- £78k
- Hounslow Council
- Group-delivered
Our projects in and around Chiswick
Which loft conversion suits a Chiswick home?
Chiswick roofs run from flat-fronted Victorian terraces to steep Bedford Park gables, and the right conversion depends on which you own. Here's the short version.
L-Shaped DormerWhy it suits Chiswick
The Glebe Estate cottages and most Victorian terraces off Chiswick High Road 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 dormersMansardWhy it suits Chiswick
Where Bedford Park's Article 4 directions or the riverside conservation streets restrict 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 Chiswick's period stock, and often the design conservation officers prefer on sensitive streets.
£78,000 – £105,000
Read more about mansardsRear DormerWhy it suits Chiswick
The most cost-effective option for the terraces between the High Road and the A4, and for the Edwardian semis around Grove Park. Usually permitted development, with a finished cost typically £58k–£72k for a master bedroom and en-suite.
£58,000 – £72,000
Read more about rear dormersPlanning permission in Chiswick: what you actually need to know
When you'll usually need planning permission in Chiswick
- Mansards (always)
- Front-facing dormers (almost always)
- Any conversion of a flat or maisonette
- Houses within the Bedford Park Conservation Area, where Article 4 directions remove permitted development rights for roof alterations
- Properties in the Grove Park and Strand-on-the-Green conservation areas
- Listed and locally listed buildings (Bedford Park has a high concentration)
- Properties where previous extensions have used up the permitted development "allowance"
- Anything that significantly alters the ridge line or chimney stacks
Conservation areas affecting Chiswick
- Bedford Park Conservation Area — The historic garden suburb north of Turnham Green. Article 4 directions mean roof alterations are tightly controlled; visible dormers are rarely supported, so mansards or Velux schemes are usually the route.
- Grove Park Conservation Area — Covers streets in the loop of the river around Grove Park Road and Hartington Road. Roof alterations are assessed against the street scene; rear-facing designs generally fare best.
- Strand-on-the-Green Conservation Area — The riverside frontage at the western end of W4. Highly sensitive setting with listed cottages; each scheme is judged case by case.
Local councils
Typical planning timeline
- Full application (Hounslow Council)
- 8–10 weeks
- Lawful Development Certificates
- ~6 weeks
We handle every part of this: Lawful Development Certificates, full planning applications, Design and Access Statements, Bedford Park heritage statements, council liaison and responding to planning officer queries, all as part of your fixed quote. You don't deal with the council, we do.
What does a loft conversion in Chiswick cost?
Chiswick sits in the upper-middle bracket of London loft conversion costs, driven by the high proportion of period properties, conservation oversight across Bedford Park and the riverside streets, and the finish level W4 homeowners typically expect. The ranges below are 2026 figures for Victorian and Edwardian houses in Chiswick. 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 | £58,000 – £72,000 | 8–10 weeks | Usually permitted development |
| L-Shaped Dormer | £68,000 – £84,000 | 10–12 weeks | Often permitted development |
| Hip-to-Gable | Quoted at survey | 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 Chiswick quoteWhat our Chiswick clients say
We 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 conversion questions from Chiswick homeowners
How much does a loft conversion in Chiswick cost?
Loft conversions in Chiswick typically cost £58,000 to £105,000 depending on the type and the property. A standard rear dormer on a Victorian terrace usually falls between £58,000 and £72,000. L-shaped dormers, common on the Glebe Estate terraces with a rear outrigger, run £68,000 to £84,000. Mansards, often the route in the Bedford Park conservation area, are £78,000 to £105,000, and a Velux conversion starts from around £42,000. Every figure is VAT included and confirmed in writing after a free home survey.
Do I need planning permission for a loft conversion in Chiswick?
Often not. Rear dormers and L-shaped dormers on Chiswick houses outside the conservation areas 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 almost all roof work in Bedford Park, where Article 4 directions have removed permitted development rights. We assess your street's exact position at the free survey and handle whichever route applies.
Can I convert a loft in Bedford Park?
Usually, yes, but the approach changes. Bedford Park is a conservation area with Article 4 directions, so roof alterations are tightly controlled and visible dormers are rarely supported. A sensitively detailed mansard on the right street, or a low-impact Velux scheme on a concealed roof slope, is normally what the conservation officers will accept. We prepare the drawings, heritage statement and full planning application as part of the fixed quote.
How long does Hounslow Council take to approve a loft conversion?
A full planning application typically takes 8 to 10 weeks with Hounslow Council. A Lawful Development Certificate, which is all most Chiswick dormer conversions outside the conservation areas 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.
What's the most common loft conversion type in Chiswick?
The L-shaped dormer. The Glebe Estate cottages and most Victorian terraces off Chiswick High Road have a rear outrigger, which is exactly the footprint an L-shaped dormer builds over, adding a master bedroom and a generous bathroom in one project. On the hipped-roof Edwardian semis around Grove Park, a hip-to-gable conversion, often combined with a rear dormer, tends to be the better fit.
Do you cover the whole of W4, including the Acton border?
Yes. We work across the whole of Chiswick W4, from Strand-on-the-Green to the Bedford Park streets on the Acton Green side. Note that the northern fringe of Bedford Park falls under Ealing Council rather than Hounslow; we confirm which council your house sits under at the survey and submit to the right one. The process and your fixed price are the same either way.
We also work in nearby areas
Don't see Chiswick as your nearest postcode? We work across London. Most of our work comes from referrals between neighbouring streets.
- Loft Conversions in Hammersmith
- Loft Conversions in Acton
- Loft Conversions in Ealing
- Loft Conversions in Fulham
- Loft Conversions in Richmond
- Loft Conversions in Shepherds Bush
Looking for a specific postcode? See all the South London areas we cover or West London areas.
Ready to start your Chiswick loft conversion?
Tell us your postcode and a bit about your house. Daniel will arrange a free home survey, usually within 5 working days in W4, and you'll have a fully itemised fixed-price proposal within 7 days of the visit. No pressure, no obligation, no hard sell.
- Free home survey, usually within 5 working days in Chiswick
- Itemised fixed-price proposal within 7 days of the survey
- 15% deposit only after you sign · 5% retention held until snagging is signed off
- VAT included in every figure
Prefer to talk? Call Daniel on 07414 648 263.