Loft Conversions · South London
— South & South-West London · 20+ years
Loft conversions in South London.
More space, the same home you love — built right the first time. Family-run loft conversion specialists working across South and South-West London for over 20 years.
A loft conversion is usually the most cost-effective way to add a proper bedroom and bathroom without leaving home. We’re a Polish family business that grew the way good builders do — one happy neighbour telling the next. The people who quote your job are the people who build it, with a fixed price in writing and a tidy site. Choose your area below for local detail, or book a free design visit.
— Areas we cover
Loft conversions by area.
The right design depends on your street, not just your house — so we’ve written a dedicated guide for each area we work in most.
Loft conversions in Selsdon
Hip-to-gable conversions on 1930s semis and detached homes in CR2. Outside the conservation areas, permitted development rights are usually intact.
Loft conversions in Wandsworth
Victorian terraces across SW11, SW12, SW17 and SW18. Forty-six conservation areas in one borough — L-shaped dormers where the rear addition allows it.
Loft conversions in Wimbledon
Victorian and Edwardian homes in SW19 and SW20. Merton’s conservation areas — including Wimbledon Village — change what the roofline will take.
Loft conversions in Clapham
Victorian terraces in SW4. Four conservation areas carry the name Clapham and boundaries split streets — we check before we quote.
Loft conversions in Richmond
Period homes in TW9, TW10, SW13 and SW14. Around 87 conservation areas, a World Heritage buffer zone at Kew and a protected vista across the park.
Loft conversions in Bromley
1930s semis across BR1 to BR7. Sixteen areas of the borough have lost their roof permitted development rights — we’ll tell you if yours is one.
Loft conversions in Dulwich
Victorian homes in SE21/SE22. We handle both the planning and the Dulwich Estate Scheme of Management approval. Not on the list? We cover the wider South London area too — get in touch.
Loft conversions in Croydon
1930s semis and interwar suburbs across CR0/CR2. Just one street in the borough has an Article 4 direction affecting roofs — most Croydon lofts are permitted development.
Loft conversions in Streatham
Victorian and Edwardian houses across SW16. Two estates carry Article 4 directions — and on one of them, the older restrictions have lapsed.
— What we build
Types of loft conversion we build.
Rooflight / Velux — the simplest and cheapest, with new windows in the existing roofline. Dormer — a flat-roofed box off the rear slope, the workhorse of South London conversions. L-shaped dormer — two dormers over a rear addition; ideal for Victorian terraces, adding a bedroom plus bathroom. Hip-to-gable — squares off a sloped side roof, the go-to for 1930s semis. Mansard — the most extensive, often the form planners prefer in conservation areas. We’ll recommend the one that gives you the most usable space for your budget — not the most expensive on the list.
— Costs
Loft conversion costs in South London.
Honest 2026 guidance — higher-value areas and premium finishes sit at the top of each range. Your exact figure depends on the roof, the finish and whether you add a bathroom. See your area page above for local ranges.
| Conversion type | Range | Timeline on site |
|---|---|---|
| Rooflight / Velux | £40,000 – £65,000 | 5-7 weeks |
| Dormer | £55,000 – £90,000 | 6-9 weeks |
| L-shaped / hip-to-gable | £65,000 – £105,000 | 7-11 weeks |
| Mansard | £90,000+ | 9-12 weeks |
Prices exclude VAT, architect, structural engineer and council fees. We confirm a fixed price in writing before any work starts — no provisional sums that balloon later.
→ See our full pricing guide for South London renovations
— How we work
One team, the whole job.
It starts with a free design visit — we look at the roof and tell you honestly what’s possible. Then drawings and structural design, planning and building control (and the Dulwich Estate where it applies), a fixed written quote, the build with one team and the same site manager every day, and sign-off with a Building Regulations completion certificate and your guarantee in writing. £2 million Public Liability insurance, two-year workmanship warranty, six-month return visit included.
— Common questions
Frequently asked.
Do I need planning permission for a loft conversion?
It depends on your home and area — many can be done under permitted development. See the official guidance on the Planning Portal — many can be done under permitted development, but conservation areas and Article 4 directions often remove those rights. We check your exact address and handle any application, plus the Building Regulations sign-off, either way. See your area page for local detail.
How much does a loft conversion cost?
As a guide, from around £40,000 for a rooflight conversion up to £90,000+ for a mansard, depending on the type, finish and whether you add a bathroom. We give you a fixed written quote before any work begins.
How long does it take?
Typically 6-12 weeks on site depending on the type, plus design and any planning beforehand. We give you a realistic programme on day one and stick to it.
Which areas do you cover?
We work across South and South-West London, with dedicated local guides for Selsdon, Wandsworth, Wimbledon, Clapham, Streatham, Richmond, Bromley, Croydon, Dulwich — and the surrounding areas.
Looking at an extension or full refurbishment instead? We do those too.
— Ready to start
Thinking about a loft conversion?
Book a free, no-pressure design visit and we’ll tell you honestly what your loft can take — what it’ll cost, how long it’ll take, and whether it’s even worth doing. No hard sell.