Loft Conversions & House Extensions in South London
AXE Construction delivers premium design-and-build projects across South West London — from concept to completion, on time and on budget.
Projects from £40,000.
What We Build
Loft Conversions
Transform unused roof space into a stunning bedroom, home office or living area. We handle design, planning permission and the full build — dormer, hip-to-gable, mansard and Velux conversions across South London.
Read moreHouse Extensions
Add space and real value with a professionally designed and built extension. Single-storey, double-storey, rear, side and kitchen extensions — delivered on time and on budget across South West London.
Read moreDesign & Build
One team. One contract. Zero hassle. We take care of architectural design, planning applications and construction from start to finish — a single point of contact and one company accountable for the result.
Read moreHouse Renovation
From full refurbishments to open-plan reconfigurations and structural alterations — we renovate homes across South London to the highest standard, working around your family life with minimal disruption.
Read moreBasement Conversions
Create a whole new floor beneath your home — kitchen, family room, gym or guest suite — without losing garden or changing the roofline. Structural design, underpinning, waterproofing and full fit-out under one accountable contract across South West London.
Read moreBathroom Renovation New
Complete bathroom renovations across 11 South London areas — design, plumbing, Part P electrics, tiling and bespoke joinery under one contract. From compact ensuites to natural-stone master bathrooms.
Read moreHow We Work
Free Consultation
We visit your home at a time that suits you, talk through your ideas and budget, and give an honest assessment. No hard sell — just a straightforward conversation.
Design & Planning
Our in-house architectural designer prepares all drawings — permitted development or full planning. We handle the council on your behalf so you don't have to.
Construction
Our own experienced build teams get to work. Dedicated project manager, regular updates, fixed programme. No subcontractors you've never met.
Handover
We obtain building control sign-off and hand over your new space properly — with all certificates in order. We're still reachable after handover.
What homeowners say about us
Our Building Services
AXE Construction specialises in loft conversions, house extensions and full design-and-build projects across South London. Every project — from a dormer in Clapham to a rear extension in Wandsworth — is managed end-to-end by our own team. No subcontractors, no handoffs. One company responsible for the design, the build and the result.
Front Extension — Streatham
A front extension with bespoke joinery, completed end-to-end by our own team — design, structural work, build and finish under a single contract.
Axe Construction is a fantastic company and I couldn't recommend them more. I had walls removed downstairs for an open-plan living space, a new kitchen fitted, a new bathroom put in with reconfigured walls and storage cupboards built for the spare room. Eduard and Avram had excellent communication and kept me updated throughout. The whole team worked really hard, quickly and efficiently, and the project ran to time. I'd absolutely use Axe Construction again.
Home Renovation
This is the easiest five-star rating ever. AXE ticked every box for us from start to finish. Competitive and detailed quote, professional but friendly (with us and our neighbours), flexible with changes, hard-working, excellent communicators. Towards the end of the job, the focus and attention to the smallest detail was beyond anyone else we have worked with. Outstanding work — thanks again, team.
Rear Extension
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Ready to start your project?
Get in touch with our builders in Streatham to kick-start your design and build project — free site visit, honest advice, fixed-price quote.
Common Questions
Most loft conversions in South London fall under Permitted Development, which means no planning permission is needed. The main exceptions are properties in conservation areas or those requiring a mansard roof. We check this at your free site visit and handle any applications if they are needed.
A standard dormer conversion typically takes 8–10 weeks from start to finish. A hip-to-gable or mansard can take 10–14 weeks depending on complexity. We give you a fixed programme before work starts so you always know what to expect.
We work mainly across South and South West London — Streatham, Clapham, Balham, Tooting, Wandsworth, Battersea, Putney, Wimbledon, Fulham, Richmond, Kingston and Surrey. Not sure if we cover your area? Just give us a call.
Prices start from around £45,000 for a Velux conversion and range up to £85,000+ for a full mansard or hip-to-gable. We provide a detailed, line-item breakdown at quote stage so you can see exactly what each element costs.
Yes. We design and build complete bathrooms across 11 South London areas — from compact ensuites to natural-stone master bathrooms — under the same single-contract approach. See our bathroom renovation pages for local pricing and guidance.