Award-Winning Design & Build for Clapham's Victorian Properties
Clapham is one of South London's most sought-after residential areas, characterised by handsome Victorian terraces, tree-lined streets, and proximity to Clapham Common. The typical Clapham terrace — three storeys, period features, a narrow side return, and a south-facing garden — is ideally suited to the kind of rear extensions, side return infills, and loft conversions that LCCL Construction specialises in.
LCCL is an LABC Award-winning design and build company with over 20 years' experience working on period properties across London. Our in-house team delivers everything: architecture, structural engineering, planning applications to Lambeth or Wandsworth Council, construction, and project management. One team, one comprehensive quote, no subcontractors.
We serve Clapham from our base in Finchley N3. We work across South London because the Victorian terraces here are the same property types we've been extending and converting for two decades — and because our clients expect award-winning quality.
Why Clapham Homeowners Choose LCCL
LABC Building Excellence Award Winners 2024 — The UK's highest independent recognition of construction quality.
200+ Reviews Averaging 4.7/5 — Consistent delivery across hundreds of projects.
Victorian Terrace Expertise — Extensive experience with the side return extensions, rear additions, and party wall challenges that Clapham's housing stock presents.
Complete Design & Build — Architecture, engineering, planning, construction, project management, and 10-year LABC warranty. No hidden extras.
Our Services
Design and build under one roof, Architecture, planning, construction, and finishing — managed by one team, from start to finish.
- HOUSE EXTENSIONS
House Extensions in Clapham — Rear Extensions, Side Returns & Open-Plan Living
The classic Clapham extension combines a side return infill with a rear extension to create an open-plan kitchen-dining-living space that transforms the ground floor. With property values in SW4 and SW11 regularly exceeding £1 million for a terraced house, the financial case for extending rather than moving is compelling.
Extension Types for Clapham Properties
Rear Extensions — Single-storey rear extensions with skylights or roof lanterns are Clapham's most popular project. For terraced properties outside conservation areas, extensions up to 3 metres deep qualify under permitted development, or up to 6 metres under the prior approval scheme. Typical costs: £52,000 to £88,000.
Side Return Extensions — Infilling the narrow side passage transforms the ground floor from a series of separate rooms into one flowing space. Cost-effective and highly impactful. Typical costs: £42,000 to £65,000.
Wraparound Extensions — Combining side return and rear extension for maximum ground-floor transformation. The most popular comprehensive extension type in Clapham. Typical costs: £68,000 to £112,000.
Basement Extensions — Viable in Clapham given property values, though subject to council policies on subterranean development. Adds substantial space without altering the external appearance. Typical costs: £160,000 to £400,000+.
What Is Included in Every Extension Quote
All prices include: in-house architectural design, structural engineering, planning applications to Lambeth or Wandsworth Council, all construction, project management, building control via LABC, and a 10-year LABC warranty. All-inclusive quote. Call 020 8037 7332.
- LOFT CONVERSIONS
Loft Conversions in Clapham — Victorian Roofs, Modern Bedrooms
Clapham's Victorian terraces have excellent loft conversion potential. Steeply pitched roofs with good ridge heights create spacious rooms when converted with rear dormers or mansard extensions. A loft conversion adds a fourth or fifth bedroom with en-suite — the extra space that growing families in Clapham need most.
Most conversions outside conservation areas qualify under permitted development. Properties near Clapham Old Town, Clapham Common North Side, or within Wandsworth's conservation areas may require planning permission.
Loft Conversion Types for Clapham Properties
Rear Dormer Conversions — The most popular choice across Clapham. Flat-roofed rear dormers maximise space while preserving the front roofline. Most qualify under PD. Costs: £48,000 to £70,000.
Mansard Conversions — Premium option creating near-full-height rooms. Requires planning permission. Best suited to mid-terrace properties. Costs: £65,000 to £92,000+.
L-Shaped Dormers — For end-of-terrace properties. Combines rear and side dormers for maximum floor area. Costs: £58,000 to £82,000.
Hip-to-Gable — For semi-detached or end-of-terrace properties with hipped roofs. Adds 30 to 40 percent more space. Costs: £52,000 to £75,000.
What Is Included in Every Loft Quote
All prices include: architecture, structural engineering, scaffolding, all construction, staircase, insulation, electrics, en-suite plumbing, building control via LABC, project management, and 10-year LABC warranty. No hidden extras. Call 020 8037 7332.
- RENOVATIONS
Renovations in Clapham — Period Character, Modern Living
Clapham's Victorian terraces combine period charm with practical renovation opportunities. Ground-floor reconfiguration to create open-plan living spaces is the most transformative change, often involving removal of the wall between the rear reception room and kitchen with steel beam installation. Beyond layout changes, comprehensive renovations typically include new kitchens and bathrooms, rewiring, replumbing, heating upgrades, and restoration of period features.
Typical renovation costs in Clapham: kitchen renovation £26,000 to £58,000, bathroom renovation £12,000 to £26,000, structural wall removal with steelwork £6,000 to £12,000, whole-house refurbishment from £95,000 upward. Detailed quotes — no day rates. Final costs confirmed once designs are agreed.
- ARCHITECTURE
In-House Architecture — Lambeth & Wandsworth Planning Experience
Clapham straddles the boundary between the London Borough of Lambeth and the London Borough of Wandsworth. Our architects submit to both councils and understand their different policies and application requirements. Properties in SW4 generally fall under Lambeth while parts of Clapham Junction and Northcote Road fall under Wandsworth.
The integrated design and build model means our architects design with construction costs in mind from day one. Every Clapham project includes: measured survey, concept designs, 3D visualisations, construction drawings, planning applications to the correct council, structural engineering, and building regulations via LABC. All included in your quote.
- LOCA PLANNING EXPERTISE
Planning & Local Knowledge — Clapham
Planning Authorities
Clapham straddles two London boroughs. Properties in SW4 (Clapham Common, Clapham Old Town, Clapham Park) generally fall within the London Borough of Lambeth. Properties around Clapham Junction, Northcote Road, and parts of SW11 fall within the London Borough of Wandsworth. Our architects confirm the correct authority for each property.
Conservation Areas
Clapham Conservation Area (Lambeth) covers Clapham Old Town, parts of Clapham Common North Side, and surrounding streets. Properties face restrictions on permitted development for visible alterations. Several conservation areas in the Wandsworth portion of Clapham include the Wandsworth Common Conservation Area and areas around Northcote Road.
Permitted Development Rights
Outside conservation areas, standard PD rights apply. Terraced properties can extend 3 metres to the rear under PD, or up to 6 metres under the prior approval scheme. Rear dormer loft conversions within volume limits qualify. LDCs recommended.
Typical Planning Timescales
Householder planning application: 8-week target. Lawful Development Certificate: approximately 8 weeks. Prior approval: 42 days. Building control: inspections throughout construction.
Party Walls
Almost all Clapham extensions involve party walls shared with neighbouring properties. The Party Wall etc. Act 1996 requires formal notification before work begins. We manage party wall notices as part of every project.
Building Control
All LCCL projects are managed through LABC building control. Inspections at each key stage ensure compliance with Building Regulations. At completion, you receive a building control completion certificate and optional 10-year LABC warranty.
Frequently Asked Questions
How much does an extension cost in Clapham?
Rear extensions: £52,000 to £88,000. Side return: £42,000 to £65,000. Wraparound: £68,000 to £112,000. All LCCL prices include architecture, engineering, planning, construction, and 10-year LABC warranty.
Which council covers my Clapham property?
Properties in SW4 are generally under Lambeth Council. Parts of Clapham around Clapham Junction and Northcote Road fall under Wandsworth. Our architects confirm the correct authority and submit applications accordingly.
What loft conversion suits Clapham terraces?
Rear dormers are most popular (£48,000 to £70,000). Mansard conversions for maximum space (£65,000 to £92,000). End-of-terrace properties suit L-shaped dormers (£58,000 to £82,000).
Do I need planning permission?
Many projects qualify under permitted development outside conservation areas. Within Clapham's conservation areas, planning permission may be required. We assess your property and handle all applications.
What's included in your price?
Everything: architecture, engineering, planning, construction, project management, building control via LABC, and 10-year LABC warranty. One team, one quote. Final costs confirmed once designs are agreed.
Areas We Cover
Based in Finchley N3, serving London and Hertfordshire.
North London and Hertfordshire
Barnet | Finchley | Hendon | Muswell Hill | Edgware | Enfield | Borehamwood | Potters Bar | Watford | St Albans
Across London
Hampstead | St Johns Wood | Islington | Kensington & Chelsea | Fulham | Clapham | Richmond | Putney & Wandsworth | Crouch End | Stoke Newington | Highgate | Ealing | Notting Hill | Camden | Queens Park