Premium Builders in Clapham
Bespoke luxury extensions, renovations and loft conversions for Clapham's elegant Victorian terraces, SW4.
Luxury Construction Services in Clapham, SW4
Clapham is one of South London's most coveted residential areas, celebrated for its elegant Victorian terraces arranged around the magnificent 220-acre Clapham Common. The area's property market attracts a discerning clientele — affluent professionals and families who appreciate fine architecture and demand the very best for their homes. Alstruct Ltd serves this exceptional community with a premium construction service that matches the sophistication and ambition of Clapham's homeowners, delivering bespoke extensions, renovations and conversions of outstanding quality.
From the grand Georgian houses lining Clapham Common North Side to the imposing Victorian terraces of Narbonne Avenue and the Abbeville Village quarter, SW4 offers an extraordinary variety of period properties with immense potential for luxury transformation. Our expert team specialises in creating show-stopping rear extensions with floor-to-ceiling glazing that floods kitchens and living spaces with natural light, premium loft conversions that add entire floors of living space, and meticulous whole-house renovations that honour period details while introducing contemporary elegance.
With Clapham Common station providing swift Northern line access to the City and West End, and outstanding schools such as Thomas's Clapham and Parkgate House nearby, the area is a magnet for families who settle here with intention to invest significantly in their homes. Alstruct's deep understanding of Lambeth Council's planning requirements — including the nuances of Clapham's multiple conservation areas — ensures every project is executed with precision and confidence.
Why Choose Alstruct in Clapham?
- Published projects on Victorian terraces and 1930s semi-detached houses
- Thorough knowledge of Lambeth Council planning and conservation requirements
- CHAS Elite, Constructionline Gold & FMB certified for complete peace of mind
- Bespoke architectural design sensitive to Clapham's distinguished streetscapes
- Handpicked premium materials from the finest British and European suppliers
- Dedicated project manager assigned exclusively to your Clapham project
- Comprehensive fixed-price quotations with absolute transparency
- Published case studies with scope, programme and budget
Frequently Asked Questions — Clapham
How much does a luxury extension cost near Clapham Common?
Luxury extensions near Clapham Common typically cost £3,200-£4,500 per square metre at high specification, or £2,500-£3,200 at mid-range. A bespoke single-storey rear extension typically costs £80,000-£160,000, while an exquisite loft conversion ranges from £60,000-£110,000. Alstruct provides meticulously detailed quotations tailored to your Clapham property.
Are Clapham's Victorian terraces suitable for loft conversions?
Clapham's elegant Victorian terraces are exceptionally well-suited to loft conversions. The generous roof pitches typical of SW4 properties allow for spacious dormer or mansard conversions, often creating a luxurious master bedroom with en-suite bathroom. Alstruct surveys the roof structure, head height and stair position before quoting a Clapham loft conversion.
Does Alstruct handle planning applications in the Clapham conservation areas?
Yes. Clapham has several conservation areas, including Clapham Old Town and areas surrounding the Common. Alstruct's in-house design team works to Lambeth Council's conservation policies and will manage your entire planning application, ensuring full compliance while achieving the maximum enhancement of your property.
What makes Alstruct different from other builders in Clapham?
Alstruct distinguishes itself through an unwavering commitment to luxury craftsmanship, transparent communication, and end-to-end project management. Our CHAS Elite, Constructionline Gold and FMB certifications reflect our dedication to the highest industry standards. We assign a dedicated project manager to every Clapham project, ensuring meticulous attention to detail from initial design through to final handover.
Luxury Construction Services in Clapham
House Extensions Clapham
Show-stopping rear, side and wraparound extensions with premium glazing that create seamless connections between Clapham's period interiors and private gardens.
Learn more →Loft Conversions Clapham
Luxurious dormer and mansard loft conversions perfectly proportioned for Clapham's Victorian terraces, adding entire floors of premium living space.
Learn more →Home Renovations Clapham
Complete luxury renovations that honour the period elegance of Clapham homes while introducing bespoke contemporary kitchens, bathrooms and living spaces.
Learn more →Basement Conversions Clapham
Expert basement excavation and conversion beneath Clapham's Victorian properties, creating sophisticated subterranean entertaining and living spaces.
Learn more →Groundworks Clapham
Precision foundations, structural underpinning and drainage engineering for luxury construction projects throughout SW4.
Learn more →Hard Landscaping Clapham
Bespoke garden design, natural stone terracing, premium paving and outdoor entertaining spaces for Clapham's finest properties.
Learn more →House and kitchen extensions in Clapham
Clapham is Victorian terraces and villas around the Common, the Abbeville Village grid, Clapham Old Town's Georgian houses, and Edwardian terraces towards Clapham North. Side-return kitchen extensions on the Abbeville and Clapham Park terraces are the signature project, with wraparounds on the wider houses and basement dig-outs near the Common.
As a guide, a well-built single-storey rear or side-return extension in Clapham costs around £2,500–£4,000 per m² including structure, glazing and finishes, so a typical 25–30 m² kitchen extension lands between £75,000 and £120,000. Our house extension cost guide explains what moves the price. Clapham, Clapham Common and Abbeville Road are conservation areas, and Lambeth Council expects rear-only dormers and matching materials on those streets. We confirm permitted development rights at the first visit and handle any application to Lambeth Council (some streets fall under Wandsworth) through our in-house design team.
Planning a kitchen extension? See our kitchen extensions page for layouts, glazing and costs.
Loft conversions in Clapham
Clapham terraces take an L-shaped rear dormer or, in the conservation streets, a mansard; villas around the Common often have room for a two-room conversion.
In London a Velux conversion costs £25,000–£45,000, a dormer loft with a bedroom and en-suite £45,000–£75,000 and a mansard £60,000–£100,000+; our loft conversion cost guide sets out what is included. We survey the roof structure, head height and stair position before we quote a Clapham loft, so the figure reflects the actual roof rather than an assumption.
Renovations and refurbishment in Clapham
Clapham renovations are often whole-house reconfigurations: opening up the ground floor, new bathrooms, sash windows and full redecoration. Typical Clapham refurbishments include structural openings with steel beams, new kitchens and bathrooms, rewiring, heating and period repairs such as sash windows, cornices and floors. Our Victorian terrace renovation cost guide gives realistic budgets, and every Clapham project runs on a JCT contract with a written specification and our 10-year workmanship warranty.
Planning approvals in Clapham
Lambeth Council approved 83.4% of householder planning applications decided between September 2025 and August 2026, against a London average of 85.8%; a typical decision took about 8.0 weeks from validation. Loft conversions that needed planning permission were approved 78.5% of the time and extensions 88.7%.
Some Clapham streets fall under Wandsworth Council instead, where the approval rate was 91.5%.
See how every London borough compares, including loft and extension approval rates, in our 2026 London planning approvals study.
Alstruct projects near Clapham
Limehouse Cottage, E14
Underpinning, ground and first-floor extensions and a full renovation with bespoke joinery.
About 5.5 miles from Clapham · View project →Lyal Road, Bow E3
Victorian terrace: ground-floor lowering, underpinning, flat-roof extension and large roof glazing.
About 6.5 miles from Clapham · View project →Whitehall Park, Archway N19
Full Victorian terrace renovation and rear extension with triple glazing and aluminium sliding doors.
About 7.5 miles from Clapham · View project →Beyond the projects above, we have recent and current sites in W14, W6, W11, SW19 and SW6 within about five miles of Clapham, and we work across every London borough from our office in South Woodford, E18. See all completed projects →
Common questions about building in Clapham
Do Alstruct cover Clapham?
Yes. Alstruct takes on extensions, renovations and loft conversions in Clapham and the surrounding neighbourhoods, working across every London borough from our office in South Woodford, E18. We visit, measure and provide a written, fixed-price quote.
How much does a house extension cost in Clapham?
As a guide, our published London figures at mid to high specification are £80,000–£160,000 for a single-storey rear extension, £65,000–£130,000 for a side return, £170,000–£320,000 for a double-storey and £190,000–£380,000 for a wrap-around. Victorian terraces and edwardian houses are the most common build type in the area, and our quote will reflect the specific condition and layout of the property. Our house extension cost guide sets out what those figures include.
Do I need planning permission for an extension in Clapham?
Clapham sits in Clapham Conservation Areas, which means Permitted Development rights are restricted and most extensions require full planning permission from Lambeth/Wandsworth Council. We handle the planning application, design drawings and party wall notices on your behalf.
What types of property do you work on in Clapham?
Victorian terraces and Edwardian houses are the most common homes in Clapham. We survey the structure, check the planning and building regulations position and price from what we find, so the quote reflects your property rather than an assumption. Our completed projects show the Victorian and 1930s houses we have extended and refurbished across London.
How quickly can Alstruct start a project in Clapham?
Once design and approvals are signed off, we typically start on site in Clapham within 6–12 weeks depending on programme availability. Design, planning and building regulations typically take 3–6 months before that. For urgent projects, get in touch on 020 8080 8240 to discuss timing.
Are you accredited to work in Clapham?
Yes. Alstruct holds CHAS Elite, Constructionline Gold and Federation of Master Builders (FMB) accreditation, with £10M public liability insurance, JCT contracts as standard, and a 10-year workmanship warranty on every project — including all work in Clapham.
Nearby areas we cover
Alstruct works across every London borough. Here are areas close to Clapham with dedicated local pages: