Loft conversion cost
in Southfields.
Southfields — SW18 — south of Wandsworth Common towards Wimbledon. The grid between the District Line station and Wimbledon Park is one of the most consistent Edwardian streetscapes in south-west London.
What makes loft work in Southfields distinct.
Housing: Edwardian three-bay terraces with bay windows and tile-hung gables — strong loft potential, often with original outriggers intact.
Planning: Southfields Grid Conservation Area covers the main 'Grid' between the station and Replingham Road. Full planning is the rule rather than the exception.
Applications go to LB Wandsworth. We submit on your behalf and handle conservation officer correspondence end-to-end.
The five loft types — SW18 numbers.
All figures inclusive of design, planning, build, contingency and VAT. The Southfields multiplier (0.95×) reflects local labour, scaffolding logistics, conservation requirements and finish expectations.
The 2026 London Loft Cost Guide.
Borough-by-borough pricing, a full cost breakdown, PD vs full planning explained, and the seven hidden costs to watch for in Southfields and beyond.
Send me the guide.
What Southfields homeowners ask us.
Do I need planning permission for a loft in Southfields?
Southfields Grid Conservation Area covers the main 'Grid' between the station and Replingham Road. Full planning is the rule rather than the exception. Outside conservation areas, most rear-dormer conversions in Southfields qualify for permitted development (PD) within the 40m³ (terrace) or 50m³ (semi/detached) volume limits. Mansards always need full planning. We check your specific address before quoting and submit the application on your behalf.
How strict is the Southfields Grid Conservation Area?
Strict on materials and proportions, fairly receptive to well-designed rear dormers. Wandsworth Council expects clay tiles, slate or matching plain tiles to existing — flat felt roofs and white UPVC are usually refused. A well-detailed L-shape dormer with timber bargeboards typically clears planning in 8–10 weeks.
How long does a Southfields loft conversion take?
Typical timeline: 6–10 weeks for design and planning (longer in conservation areas like much of Southfields), then 8–14 weeks on site for a standard dormer, 12–18 weeks for an L-shape or hip-to-gable, and 14–20 weeks for a mansard. LB Wandsworth processes PD-route Lawful Development Certificates in approximately 8 weeks.
What does a loft conversion add to Southfields property values?
In SW18, a well-executed loft conversion typically adds 15–25% to property value — often more in prime postcodes. The ROI is strongest when you add a double bedroom plus en-suite, which is the standard L-shape dormer configuration. Property uplift on a £43k–£209k build commonly exceeds the build cost by 30–60%.
Does 2VP work on Southfields loft conversions?
Yes — Southfields is within our core London catchment. Our studio is at 20 Dawes Road in Fulham, 3.6km from Southfields. We've delivered loft conversions across the SW18 postcode and our subcontractor network covers Wandsworth. Free site visit, fixed-price quote, 10-year HomePro guarantee on the finished work.
Pricing for Southfields’s neighbours.
Twenty minutes on site in Southfields.
On us.
Nick Elias RIBA and Vladimir will visit your Southfields home, walk the loft, check head height, advise on PD vs planning, and give you a realistic budget and programme — even if a loft isn’t right for your house.
One number. Sixty seconds. No callback.
Price your Southfields loft conversion using the same 2026 rate card we quote real clients with.
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