Transform your Clapham home with West London’s award-winning design and build specialists. From architectural planning to final handover, we deliver exceptional building projects across Clapham and surrounding areas.
Why Clapham Homeowners Choose JNJ Building Services
With over 70 years of combined construction expertise and Which? Trusted Trader status, we’re the building contractors Clapham families rely on for stress-free home transformations. Our award-winning design team brings your vision to life, whether you’re planning a single storey extension, complete house renovation or luxury refurbishment.
More than 10 Years Established
Multi Award Winnning
In House Architects & Structural Engineers
Family Run
Costing & Management Software
City & Guilds Qualified Trades
Fully
Insured
Complete In-House Expertise Under One Roof
Unlike other building contractors, we handle everything internally – no subcontractors, no miscommunication. Our Clapham-based team includes:
- Chartered Architects for creative, planning-compliant designs
- Structural Engineers ensuring robust, future-proof builds
- Party Wall Surveyors managing neighbour agreements seamlessly
- Planning Permission Specialists navigating Clapham Council requirements
This integrated approach means your project flows smoothly from concept to completion, with one trusted team accountable at every stage.
LOFT CONVERSIONS
EXTENSIONS
FULL REFURBISHMENTS
DEVELOPMENTS
Single & Two Storey Extensions Clapham
Adding space to your Clapham property doesn’t mean compromising on character. We design extensions that enhance your home’s architecture whilst creating the room you need – whether that’s a bright kitchen extension overlooking your garden or a two storey addition providing extra bedrooms and bathrooms.
Our extensions blend seamlessly with Clapham’s diverse property styles, from Victorian terraces around Clapham Common to Edwardian semis in Clapham Old Town and elegant Georgian townhouses near The Pavement.
Complete Home Renovations & Refurbishments
Thinking of renovating your Clapham home? We specialise in full-scale house renovations that transform tired properties into stunning modern homes. From period property refurbishments that respect original features to contemporary makeovers, we project manage everything – structural work, electrics, plumbing, plastering, decorating and landscaping.
Recent refurbishment projects span Abbeville Village, Clapham Park, Stockwell, Oval and Brixton borders, with particularly strong experience renovating properties in conservation areas where planning sensitivity matters.
Basement Conversions & Loft Extensions
Maximise your Clapham property’s potential without extending your footprint. Our basement developments create incredible living spaces – home cinemas, gyms, playrooms or self-contained guest suites. Loft conversions add valuable bedroom space, perfect for growing families in Clapham’s competitive property market.
Kitchen & Bathroom Renovations
Transform the heart of your home with a bespoke kitchen renovation, or add luxury with an en-suite bathroom installation. We handle design, structural alterations, plumbing, electrics and finishing – coordinating every trade to deliver on time and to budget.
Building Services Across Clapham, South London
Serving Clapham & Neighbouring South London Areas
Our building services cover Clapham and surrounding neighbourhoods including:
- Central Clapham: Clapham Common, Clapham Old Town, The Pavement, Clapham High Street
- North Clapham: Clapham North, Stockwell, Larkhall, Lansdowne Way
- South Clapham: Clapham South, Abbeville Village, Trinity Road, Nightingale Lane
- East Clapham: Clapham Park, Brixton borders, Kings Avenue, Long Road
We also serve Hammersmith, Richmond, Kensington, Putney, Clapham, Ealing, Barnes, Balham, Shepherds Bush, Holland Park, Earls Court, Chelsea, Battersea, Wimbledon Park, Brentford, Kew, Brixton, Kennington, Vauxhall and across W3, W4, W6, TW8, W14, W12, SW6, SW10, and SW15 postcodes. We also operate in Teddington, and Twickenham.
Gold Rated
As approved members of the Considerate Constructors Scheme, we take neighbourhood impact seriously. Clean sites, respectful working hours, and minimal disruption to Clapham residents – including managing parking, noise and waste responsibly.
Which? Trusted Traders
Independently Vetted & Approved
Committed to Quality & Professionalism
Trusted by Homeowners Nationwide
Verified Customer Reviews
Strict Code of Conduct ensuring high standards on every project.
WHAT OUR WONDERFUL CLIENTS SAY
We only use
City & Guilds
Qualified Tradesmen
OUR CORE VALUES
1. STRIVE TO BE BETTER THAN OUR PREVIOUS BEST
By working smarter through seeking new ideas.
Learning ways to improve ourselves by reviewing and updating our practices.
2. DELIVER A GREAT CLIENT EXPERIENCE
By operating as authentic, trusted professionals with business-like conduct on the worksite, in the office, and the community.
3. ACT RESPONSIBLY
In a no-blame culture – by operating with integrity, owning mistakes, and using feedback to improve where everyone takes personal ownership to achieve targets.
4. BEING A RESOURCEFUL AND RESILIENT TEAM
By fostering a caring ethos that encourages loyalty, productivity, and personal aspirations.
5. PURPOSE DRIVEN NOT PROFIT DRIVEN
By proudly delivering quality finishes, within a realistic budget and achievable timescales.
SUPPORTING MENTAL HEALTH IN CONSTRUCTION
JNJ Building Services Ltd
Phone office: 020 8050 9523
Email: enquiries@jnjbuilding.co.uk
Address: 277–279 Chiswick High Road, Chiswick, London, W4 4PU
08933599, Registered in England, Wales, Northern Ireland
