Project showcase · East Barnet EN4
East Barnet EN4 — Rear Extension, Hip-to-Gable Loft Conversion, Full Renovation and Landscaping
Edwardian semi · 7m bifold doors · Zinc cladding · Lusso Stone · Buster & Punch · Completed - 2024 LABC Award Winners 2024 · Best Residential Extension London
Introduction
A full design and build transformation of an Edwardian semi in East Barnet
East Barnet is a well-established residential area in the London Borough of Barnet — popular with families for its good schools, green spaces and strong transport links. Edwardian semi-detached houses like this one are common in the area: solid, well-proportioned properties with genuine character, but often constrained by the layout conventions of their era — cellular rooms, limited ground floor living space, and roof structures that leave significant potential floor area unrealised.
This project, completed in 2024 after 12 months on site, demonstrates what is possible when a full design and build approach is taken to an Edwardian semi. LCCL Construction delivered a rear house extension with a 7-metre panoramic bifold door opening, a hip-to-gable loft conversion with zinc cladding and slate roof, a complete internal renovation with some of the finest finishes available — Lusso Stone bathrooms, chevron floors, Buster & Punch gold hardware on black doors throughout — plus a new outbuilding, total landscaping and a cinema room.
The result is a home that has been fundamentally reimagined — more space, better light, a specification that matches the finest new build properties, and a distinctive exterior that stands out in the streetscene for all the right reasons.
This project was awarded the LABC Regional Award 2024 for Best Residential Extension in London — one of the construction industry's most respected independent quality awards, judged on design, build quality and client outcome.
Before and After
Before
During
Completed
The challenge
Combining extension, loft, renovation and landscaping under one contract
A project combining a rear extension, loft conversion, full renovation, outbuilding and landscaping on a semi-detached property presents a complex programme management challenge. Each element of the works affects the others — the loft conversion structure must be coordinated with the extension roof, the drainage strategy must account for both the extended footprint and the landscaped garden, and the interior renovation must be sequenced to follow the structural works without unnecessarily extending the programme.
The hip-to-gable loft conversion required a party wall agreement with the neighbouring property, careful structural design to support the new gable wall, and a zinc cladding specification that required a specialist subcontractor working to exacting installation standards. Zinc cladding on a loft conversion is an architecturally confident choice — its distinctive appearance and exceptional longevity make it a premium option, but it demands precision in both design and installation.
The 7-metre panoramic bifold door opening presented its own structural challenge. An opening of this width requires a substantial steel beam above — engineered to carry the load of the floor and roof structure above while spanning the full width of the opening without intermediate support. The bifold door system itself must be precisely specified and installed to ensure smooth operation, weathertightness and thermal performance across such a large opening.
Water management across the site — covering the extension, loft, outbuilding and landscaped garden — was designed and managed by LCCL Construction's engineering team as part of the overall project, ensuring full building regulations compliance throughout.
Scope of works
- Full architectural design, planning application and approvals
- Party wall agreements with neighbouring property
- Structural engineering and full calculations for extension and loft
- Building control throughout and completion certificate
- Project management throughout — single point of contact
- Rear house extension — open plan luxury kitchen and dining space
- 7-metre panoramic bifold door system — full-width garden opening
- Structural steel beam engineered for 7m clear span above bifold opening
- Hip-to-gable loft conversion — full-width usable loft space
- Zinc cladding to loft conversion exterior
- Slate roof throughout
- New loft bedrooms with recessed lighting
- Lusso Stone bathrooms — 2 new bathrooms — fully tiled floor to ceiling
- Italian porcelain tiles and Mandarin Stone tiles specified throughout
- Oak staircase to loft level
- Chevron engineered wood floors throughout ground floor
- Black internal doors with Buster & Punch gold handle trim throughout
- Recessed lighting throughout all rooms
- Full rewiring, new consumer unit and underfloor heating to extension
- High-end kitchen supply and full installation
- Cinema room — acoustic treatment and AV installation
- Open plan study
- New outbuilding — purpose-built as home office and gym
- Total landscaping of front and rear garden
Design & specification
High-end finishes and signature details throughout
The design language of this project is bold and deliberately considered — every material and finish decision has been made with an eye for how it contributes to a coherent whole. The result is a home with a strong, confident interior identity that will stand the test of time.
The 7-metre bifold door opening is the defining architectural gesture of the ground floor extension. When fully open, it erases the boundary between the new open plan kitchen and the garden — creating a single, flowing living space that is transformative in its generosity of light and air. Chevron engineered wood floors run through the ground floor — a classic pattern that brings movement and richness to the floor plane. The black internal doors with Buster & Punch gold handle trim are a signature detail that runs through every room in the property — a unifying element that gives the interior a jewellery-like consistency.
Lusso Stone bathrooms — fully tiled floor to ceiling in Italian porcelain and Mandarin Stone — deliver a finish that rivals the finest luxury hotels. On the exterior, the zinc cladding to the hip-to-gable loft conversion and the slate roof together create an elevation that reads as deliberately architectural — zinc weathers to a beautiful grey patina over time, ensuring the property will continue to improve in appearance for years after completion.
Finished project gallery
Outcome
An Edwardian semi transformed into a high-specification family home
A standard semi-detached house in East Barnet has been transformed into a high-specification family home with substantially increased floor area, a contemporary open plan ground floor, a fully converted loft, a landscaped garden and a purpose-built outbuilding. The project represents a complete reimagining of what the property could be — and the result justifies every element of the investment.
- New open plan kitchen and dining room with 7m panoramic bifold doors
- Cinema room
- Open plan study
- Home office and gym in new outbuilding
- Chevron floors throughout ground floor
- Black doors with Buster & Punch gold handles throughout
- Zinc cladding and slate roof on loft conversion
- Oak staircase
- Recessed lighting throughout
- Fully landscaped front and rear garden
- Significantly increased property value
About LCCL Construction
About LCCL Construction
LCCL Construction is a LABC Award-winning design and build company based in Finchley, London N3. We deliver house extensions, loft conversions, luxury renovations and full design and build projects across London and Hertfordshire. With over 20 years of experience, 200+ verified reviews rated 4.7/5, and optional 10-year LABC warranties, we have the expertise to transform your property.
Call 020 8037 7332 or visit lcclconstruction.co.uk to book your free consultation.
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