Ballantine Street, Wandsworth SW18
Rear mansard creating a main bedroom and shower room on a Victorian terrace in the Tonsleys, a short walk from Wandsworth Town station.
- Mansard
- 14 weeks
- £86k
- Wandsworth Council
- Delivered by us
Loft Conversions in Wandsworth SW18
The London Loft Conversion Company designs and builds loft conversions across Wandsworth and the surrounding SW18, SW11 and SW15 postcodes, 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
- £56k–£70k, 8–12 weeks
- Area
- Wandsworth SW18 (SW11, SW15)
- Local council
- Wandsworth
- Best for
- Victorian and Edwardian terraces
Why Wandsworth homes are so well suited to loft conversions
Wandsworth splits into two distinct pockets of period housing, and both convert exceptionally well. Around Wandsworth Town, East Hill and Allfarthing Lane the streets are lined with Victorian terraces with rear outriggers, ideal for L-shaped dormers and rear dormers. Down in Southfields, the famous "grid" of Edwardian terraces was built with hipped roof ends, which is exactly what a hip-to-gable conversion was made for.
Planning is simpler here than in many neighbouring areas because the whole of SW18 sits under a single authority, Wandsworth Council. A full application typically takes 8–10 weeks; Lawful Development Certificates are usually decided in around 6 weeks. The main local watch-out is the Tonsleys, the pocket of Victorian streets near Wandsworth Town station, where conservation status can restrict rear dormers and a mansard or Velux conversion is often the smarter route.
We're around 15 minutes from our Fulham base, straight over Wandsworth Bridge, so surveys in SW18 are usually same-day or next-working-day visits. The Tonsleys and the Southfields grid are classic referral territory for us. The houses repeat street after street, so once one conversion is done, neighbours can see exactly what theirs would look like.
Recent loft conversions in Wandsworth
A selection of dormer, hip-to-gable, L-shaped and mansard projects we've delivered in SW18 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.
Elsenham Street, Southfields SW18
Hip-to-gable conversion with rear dormer on an Edwardian grid terrace, adding a double bedroom and en-suite.
- Hip-to-Gable
- 11 weeks
- £68k
- Wandsworth Council
- Delivered by us
Melody Road, Wandsworth SW18
L-shaped dormer over the rear outrigger of a Victorian mid-terrace, adding a master bedroom and family bathroom.
- L-Shaped Dormer
- 11 weeks
- £73k
- Wandsworth Council
- Group-delivered
Geraldine Road, Wandsworth SW18
Rear dormer with double bedroom and walk-in shower on a Victorian terrace between East Hill and Wandsworth Common.
- Dormer
- 9 weeks
- £60k
- Wandsworth Council
- Group-delivered
Santos Road, West Hill SW18
Dormer conversion creating a light-filled guest bedroom with built-in eaves storage, on the Putney edge of Wandsworth.
- Dormer
- 10 weeks
- £63k
- Wandsworth Council
- Group-delivered
Baskerville Road, Wandsworth SW18
Front and rear mansard adding two rooms and a bathroom to a substantial house on the Toast Rack, by Wandsworth Common.
- Mansard
- 15 weeks
- £98k
- Wandsworth Council
- Group-delivered
Our projects in and around Wandsworth
Which loft conversion suits a Wandsworth home?
Wandsworth's roofs fall into a handful of repeating patterns, from Victorian outriggers near the Town to hipped Edwardian ends in Southfields. Here's how the main options map onto them.
L-Shaped DormerWhy it suits Wandsworth
The Victorian terraces around Wandsworth Town, East Hill and Allfarthing Lane almost all have a rear outrigger, and an L-shaped dormer builds directly over it. Two rooms in one project, usually a master bedroom and a generous bathroom, and on most streets outside the Tonsleys it falls within permitted development.
£66,000 – £80,000
Read more about l-shaped dormersHip-to-GableWhy it suits Wandsworth
The signature conversion for the Southfields grid. Those Edwardian terraces were built with hipped roof ends that squeeze the loft; rebuilding the hip as a full gable, usually combined with a rear dormer, turns a cramped roof space into a proper double bedroom and en-suite.
£58,000 – £72,000
Read more about hip-to-gablesRear DormerWhy it suits Wandsworth
The most cost-effective route for the straight-roofed Victorian and Edwardian terraces off Garratt Lane and between East Hill and the Common. Usually permitted development, with a finished cost typically £56k–£70k for a master bedroom and en-suite.
£56,000 – £70,000
Read more about rear dormersPlanning permission in Wandsworth: what you actually need to know
When you'll usually need planning permission in Wandsworth
- Mansards (always)
- Front-facing dormers (almost always)
- Any conversion of a flat or maisonette
- Properties within the Tonsleys conservation area near Wandsworth Town
- Listed buildings (rare in SW18, but worth checking)
- Properties where previous extensions have used up the permitted development "allowance"
- Anything that significantly alters the ridge line or chimney stacks
Conservation areas affecting Wandsworth
- The Tonsleys — The pocket of Victorian streets between Old York Road and East Hill, near Wandsworth Town station. Rear dormers typically restricted; mansards or Velux conversions usually the recommended route.
- Wandsworth Common — Streets around the Common, including the "Toast Rack" grid off Trinity Road, have conservation oversight. Roof alterations are assessed against the street scene.
- Southfields Grid — The Edwardian grid streets between Merton Road and Replingham Road have local design guidance. Hip-to-gable and dormer designs need to respect the repeating roofline.
Local councils
Wandsworth Council
Covers all of SW18 plus the SW11 and SW15 edges
Planning portal: wandsworth.gov.uk/planning
Typical planning timeline
- Full application (Wandsworth Council)
- 8–10 weeks
- Lawful Development Certificates
- ~6 weeks
We handle every part of this, from Lawful Development Certificates and full planning applications to 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 Wandsworth cost?
Wandsworth pricing sits in the upper-middle bracket for London because of the borough's period housing stock, the conservation oversight on streets like the Tonsleys and the Toast Rack, and the finish level SW18 homeowners typically expect. The ranges below are 2026 figures for Victorian and Edwardian houses in SW18 and the SW11 and SW15 edges. Final quotes are confirmed in writing after a free home survey.
| Type | Typical range | Build time | Planning |
|---|---|---|---|
| Velux | £40,000 – £50,000 | 6–8 weeks | Usually permitted development |
| Dormer | £56,000 – £70,000 | 8–10 weeks | Usually permitted development |
| L-Shaped Dormer | £66,000 – £80,000 | 10–12 weeks | Often permitted development |
| Hip-to-Gable | £58,000 – £72,000 | 10–12 weeks | Usually permitted development |
| Mansard | £76,000 – £100,000 | 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 Wandsworth quoteWhat our Wandsworth 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 Wandsworth homeowners
How much does a loft conversion in Wandsworth cost?
Loft conversions in Wandsworth typically cost £56,000 to £100,000 depending on the type and the property. A standard rear dormer on a Victorian terrace usually falls between £56,000 and £70,000. L-shaped dormers over a rear outrigger run £66,000 to £80,000. Hip-to-gable conversions, the go-to for the Southfields grid, are £58,000 to £72,000, and mansards are £76,000 to £100,000. Every figure is VAT included and confirmed in writing after a free home survey.
Do I need planning permission for a loft conversion in Wandsworth?
Often not. Rear dormers, L-shaped dormers and hip-to-gable conversions on Wandsworth 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 roof work in the Tonsleys. We assess your street's exact position at the free survey and handle whichever route applies.
How long does Wandsworth Council take to approve a loft conversion?
A full planning application typically takes 8 to 10 weeks. A Lawful Development Certificate, which is all most SW18 dormer and hip-to-gable conversions need, is usually decided in around 6 weeks. Because the whole of SW18 sits under one council, there are no boundary complications. We prepare and submit everything and build the approval time into your programme.
Can I convert a loft in the Tonsleys?
Usually, yes, but the type changes. Conservation status in the Tonsleys means rear dormers are typically restricted, so a mansard, which rebuilds the rear roof at a steep angle behind the ridge, 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.
What works best on a Southfields grid house?
A hip-to-gable conversion, usually combined with a rear dormer. The Edwardian grid terraces were built with hipped roof ends that cut the usable loft space short; rebuilding the hip as a full gable recovers that volume and typically delivers a double bedroom and en-suite for £58,000 to £72,000, usually within permitted development.
Do you cover Earlsfield and Southfields as well as Wandsworth Town?
Yes. We work across the whole of SW18, from the Tonsleys and East Hill through West Hill, Southfields and the Earlsfield borders, plus the SW11 and SW15 edges. We're around 15 minutes from our Fulham base, so surveys anywhere in Wandsworth are usually same-day or next-working-day visits.
We also work in nearby areas
Don't see Wandsworth as your nearest postcode? We work across London. Most of our work comes from referrals between neighbouring streets.
- Loft Conversions in Putney
- Loft Conversions in Battersea
- Loft Conversions in Clapham
- Loft Conversions in Balham
- Loft Conversions in Tooting
- Loft Conversions in Fulham
Looking for a specific postcode? See all the South London areas we cover or West London areas.
Ready to start your Wandsworth 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 SW18, 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 Wandsworth
- 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.