Englewood Road, Clapham SW4
L-shaped dormer adding a master bedroom and en-suite to a Victorian end-of-terrace.
- L-Shaped Dormer
- 11 weeks
- £74k
- Wandsworth Council
- Delivered by us
Loft Conversions in Clapham SW4
The London Loft Conversion Company designs and builds loft conversions across Clapham and the surrounding SW4, SW8, SW11 and SW12 postcodes, around 20 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
- Clapham SW4 (SW8, SW11, SW12)
- Local council
- Lambeth / Wandsworth
- Best for
- Victorian and Edwardian terraces
Why Clapham is one of the best parts of London for a loft conversion
Clapham is dominated by Victorian and Edwardian terraced houses, most built between the 1870s and the early 1900s, with mid-pitch rear roof slopes and rear back additions ("outriggers"). That stock is some of the best in London for loft conversions, particularly L-shaped dormers and rear dormers, both of which add real headroom and proper floor area without altering the front of the street.
Planning sits with Lambeth Council across most of SW4, with Wandsworth Council picking up the western edge into SW11 and SW8. Lambeth's planning portal typically takes 8–10 weeks for a full application; Lawful Development Certificates are faster, usually 6 weeks. The Clapham Old Town Conservation Area covers the streets around Old Town and The Pavement, where rear dormers can be restricted, so a mansard or a low-impact Velux conversion is often the better route.
We're around 20 minutes by road from our Fulham base, which means same-day or next-working-day survey visits across Clapham. Most of our Clapham 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 Clapham
A selection of dormer, L-shaped and mansard projects we've delivered in SW4 and the immediately surrounding postcodes, labelled clearly so you can see whether the build was through The London Loft Conversion Company or our parent company, Pillarstone Operations Group.
Mandalay Road, Clapham SW4
Rear mansard conversion creating a home office and shower room on a Victorian terrace within the Clapham Old Town conservation area.
- Mansard
- 14 weeks
- £88k
- Lambeth Council
- Delivered by us
Manchuria Road, Battersea SW11
Rear dormer with double bedroom and walk-in shower on an Edwardian mid-terrace, 5 minutes from Clapham Junction.
- Dormer
- 9 weeks
- £62k
- Wandsworth Council
- Group-delivered
Bennerley Road, Clapham SW11
Front and rear mansard transforming the loft into a meditation and yoga space on a Victorian terrace.
- Mansard
- 15 weeks
- £95k
- Wandsworth Council
- Group-delivered
Cathies Road, Clapham SW4
Rear dormer creating two spacious bedrooms with reconfigured second-floor layout.
- Dormer
- 10 weeks
- £69k
- Lambeth Council
- Group-delivered
Brenda Road, Clapham SW4
L-shaped rear dormer with innovative staircase and walk-on glazing to bring light to the lower floor.
- L-Shaped Dormer
- 12 weeks
- £78k
- Wandsworth Council
- Group-delivered
Our projects in and around Clapham
Which loft conversion suits a Clapham home?
Most Clapham properties fall into two or three roof types, and the right loft conversion depends on yours. Here's the short version.
L-Shaped DormerWhy it suits Clapham
Most Victorian and Edwardian terraces in Clapham 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 vast majority of houses outside the conservation area.
£68,000 – £82,000
Read more about l-shaped dormersMansardWhy it suits Clapham
Where the Clapham Old Town conservation area restricts 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 Clapham's period stock, and the right call for properties around Old Town, The Pavement and the streets immediately south of the Common.
£78,000 – £105,000
Read more about mansardsRear DormerWhy it suits Clapham
The most cost-effective option for the Victorian and Edwardian terraces north of the Common and out towards Wandsworth Road. 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 Clapham: what you actually need to know
When you'll usually need planning permission in Clapham
- Mansards: always
- Front-facing dormers: almost always
- Any conversion of a flat or maisonette
- Properties within the Clapham Old Town Conservation Area
- Listed buildings (relatively rare in SW4 but check)
- Properties where previous extensions have used up the permitted development "allowance"
- Anything that significantly alters the ridge line or chimney stacks
Conservation areas affecting Clapham
- Clapham Old Town Conservation Area — Covers the streets around Old Town, The Pavement, and the southern edge of the Common. Rear dormers typically restricted; mansards usually the recommended route.
- Old Town and West Side — Extends into the streets west of the Common toward Wandsworth Road. Similar restrictions.
- Wandsworth-side conservation pockets in SW11 — Some streets around Lavender Hill have local conservation considerations.
Local councils
Wandsworth Council
Covers western edge of SW4, all of SW11
Planning portal: wandsworth.gov.uk/planning
Typical planning timeline
- Full application (with either council)
- 8–10 weeks
- Lawful Development Certificates
- ~6 weeks
We handle every part of this: Lawful Development Certificates, full planning applications, Design & Access Statements, conservation-area 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 Clapham cost?
Clapham sits in the upper bracket of London loft conversion costs because of the high prevalence of period properties, the conservation oversight on some streets, and the higher finish expectations Clapham homeowners typically have. The ranges below are 2026 figures for Victorian and Edwardian terraces in SW4, SW8, SW11 and SW12. 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 – £82,000 | 10–12 weeks | Often permitted development |
| Hip-to-Gable | Less common in SW4 | — | — |
| 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 Clapham quoteWhat our Clapham 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 Clapham homeowners
How much does a loft conversion in Clapham cost?
Loft conversions in Clapham 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 terraces with a rear outrigger, run £68,000 to £82,000. Mansards, often required in the Clapham Old Town conservation area, are £78,000 to £105,000. Every figure is VAT included and confirmed in writing after a free home survey.
Do I need planning permission for a loft conversion in Clapham?
Often not. Rear dormers and L-shaped dormers on Clapham 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 within the Clapham Old Town Conservation Area. We assess your street's exact position at the free survey and handle whichever route applies.
How long does Lambeth or Wandsworth Council take to approve a loft conversion?
A full planning application typically takes 8 to 10 weeks with either council. A Lawful Development Certificate, which is all most Clapham 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.
What's the most common loft conversion type in Clapham?
The L-shaped dormer. Most of Clapham's Victorian and Edwardian terraces 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. Straight rear dormers are the next most common, particularly north of the Common.
Will a loft conversion work on a Clapham house in the conservation area?
Usually, yes, but the type changes. Rear dormers are typically restricted in the Clapham Old Town Conservation Area, so a mansard, which rebuilds the rear roof at a steep angle, or a low-impact Velux conversion is normally the recommended route. We prepare the heritage statement and full planning application as part of the fixed quote.
Do you work on the Lambeth/Wandsworth boundary in Clapham?
Yes, constantly. The boundary runs through Clapham, with Lambeth covering most of SW4 and Wandsworth picking up the western edge into SW11 and SW8. We confirm which council your house falls 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 Clapham as your nearest postcode? We work across London. Most of our work comes from referrals between neighbouring streets.
- Loft Conversions in Wandsworth
- Loft Conversions in Battersea
- Loft Conversions in Balham
- Loft Conversions in Tooting
- Loft Conversions in Streatham
- Loft Conversions in Putney
Looking for a specific postcode? See all the South London areas we cover or West London areas.
Ready to start your Clapham 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 SW4, 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 Clapham
- 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.