Award-Winning Design & Build in Finchley
Your Local Design & Build Company — Based Right Here in Finchley N3 LCCL Construction does not just serve Finchley — we are based here. Our office is in N3. Our team lives and works in this community.
When you choose LCCL for your extension, loft conversion, renovation or architectural project, you are working with a company that is genuinely local in a way that London-wide firms covering dozens of boroughs simply cannot match. That matters because local knowledge determines whether your project runs smoothly or hits problems. Our architects know what Barnet Council’s planning officers expect in applications.
Our builders understand the housing stock — from the Edwardian terraces along Ballards Lane to the 1930s semis of Woodside Park, the larger detached homes near Tally Ho Corner, and the Victorian cottages around East Finchley. Our project managers can be on your site in minutes, not hours.
Many homeowners in Finchley get quotes from companies that cover all of London or firms that only do lofts. With LCCL, you get a full design and build company that handles everything — architecture, structural engineering, planning, construction, project management — under one roof. No subcontractors you have never met. No finger-pointing between architect and builder.
Why Finchley Homeowners Choose LCCL
One team accountable for your entire project, from first sketch to final handover.
LABC Building Excellence Award Winners 2024 — The only local company with this independent industry award, verifying our design and construction quality meets the highest national standards.
200+ Reviews Averaging 4.7/5 — Not anonymous internet reviews. Real homeowners across Finchley and North London who trusted us with their homes and were happy enough to say so publicly.
Based in Finchley N3 — Not a London-wide company. Not a franchise. A local business with a 20-year track record on your doorstep. We do not disappear after handover.
Complete Design & Build Including Architecture — Our price includes in-house architectural design, structural engineering, planning applications, all construction, project management, building control, and a 10-year LABC warranty. Transparent pricing with no hidden extras. Final costs confirmed once designs and structural requirements are agreed.
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 Finchley
In an area where moving to a larger home means finding an extra £200,000 or more in purchase price and stamp duty, extending your current Finchley property is the smartest financial decision you can make. And with LCCL, you get the complete package — architecture, structural engineering, planning, and construction from one team based right here in N3.
Finchley’s property mix creates excellent opportunities for every type of extension. The wide-fronted 1930s semis in Woodside Park and West Finchley are ideal for side return and wraparound extensions that can transform a typical three-bed semi into a five-bed family home. The Victorian and Edwardian terraces along the N3 corridor suit rear extensions that open up narrow kitchens into generous open-plan living spaces. The larger detached properties near Totteridge Lane have scope for substantial double-storey additions.
Extension Types We Build in Finchley
Single-Storey Rear Extensions — The most requested project in Finchley. Under permitted development, you can extend up to 6 metres (detached) or 4 metres (semi-detached and terraced) without planning permission. Our kitchen-diner extensions typically range from 4 to 8 metres deep, creating open-plan living spaces that completely change how families use their home. Typical costs: £50,000 to £90,000 depending on size and specification.
Wraparound Extensions — Combining a side return with a rear extension to maximise your ground-floor footprint. Particularly effective on the wider-fronted semis in West Finchley and Woodside Park, where the side passage can be incorporated to create an L-shaped or full-width extension. Typical costs: £70,000 to £110,000.
Double-Storey Extensions — For families who need both additional living space downstairs and extra bedrooms upstairs. A double-storey rear extension on a Finchley semi can add 40 to 60 square metres of floor space. Typical costs: £100,000 to £180,000.
Infill and Side Return Extensions — Many Finchley terraces have an underused side return passage that can be absorbed into the kitchen footprint. This relatively modest alteration makes a significant difference to the feel of the ground floor. Often the most cost-effective way to gain space. Typical costs: £40,000 to £60,000.
What Is Included in Every Extension Quote
All extension prices include: in-house architectural design, structural engineering calculations, planning applications where required, Lawful Development Certificates where applicable, building control via LABC, all construction labour and materials, project management, and a 10-year LABC warranty.
Transparent pricing with no hidden extras. Final costs confirmed once designs and structural requirements are agreed — no hidden extras, no surprise invoices halfway through the build. Call 020 8037 7332 for a free consultation at your property.
- LOFT CONVERSIONS
Loft Conversions in Finchley
Finchley’s housing stock is exceptionally well suited to loft conversions. The 1930s semi-detached homes that dominate Woodside Park and West Finchley have generous roof spaces with hipped roofs perfect for hip-to-gable conversions. The Edwardian terraces along Ballards Lane and Church End have steeply pitched roofs with good ridge heights.
Even the more modest postwar properties in parts of North Finchley often have viable loft space. A well-designed conversion adds a full bedroom and en-suite, typically increasing your property value by 15 to 25 percent — and you keep your garden. Most loft conversions in Finchley qualify under permitted development rights, meaning no planning application is required. For properties in or near the Church End Conservation Area or other locally sensitive areas, our architects handle the additional requirements.
Loft Conversion Types for Finchley Properties
Dormer Loft Conversions — The most popular choice across Finchley. A flat-roof rear dormer maximises headroom and usable floor space, typically creating a spacious double bedroom with en-suite. Costs: £45,000 to £65,000.
Hip-to-Gable Conversions — The ideal option for the 1930s semis in Woodside Park, West Finchley and North Finchley. Extending the hipped roof into a vertical gable wall adds 30 to 40 percent more usable space than a dormer alone. Usually combined with a rear dormer for maximum space. Costs: £50,000 to £70,000.
L-Shaped Dormer Conversions — For semi-detached and end-of-terrace properties where both a rear and side dormer can be combined. Creates enough space for two bedrooms or a large master suite with dressing area and en-suite. Costs: £55,000 to £75,000.
Mansard Loft Conversions — The premium option that replaces the existing roof structure, creating almost a full additional storey with near-vertical walls. Mansard conversions always require planning permission but deliver maximum space. Well suited to the Victorian properties near East Finchley. Costs: £65,000 to £85,000.
What Is Included in Every Loft Conversion Quote
All prices include: in-house architectural design, structural engineering calculations, scaffolding, all construction including steelwork, staircase, dormer or gable construction, insulation, plastering, electrics, plumbing for en-suite, building control via LABC, project management, and a 10-year LABC warranty. No hidden extras. The price we quote is what you pay.
Call 020 8037 7332 to discuss your loft.
- RENOVATIONS
Renovations in Finchley
Finchley’s housing stock spans nearly 150 years, and each era of property brings its own renovation opportunities and challenges. The Victorian and Edwardian terraces near East Finchley station often have dated layouts with separate front reception rooms, rear dining rooms and small galley kitchens — all ripe for structural reconfiguration into the open-plan living spaces that modern families need.
The 1930s semis of Woodside Park frequently have original kitchens, bathrooms and heating systems that are ready for comprehensive upgrading. The larger detached homes near Totteridge Lane sometimes need full refurbishments after decades of piecemeal alterations.
LCCL Construction delivers renovations of every scale. Our service covers structural alterations including load-bearing wall removal with steel beam installation, complete kitchen installations from budget-friendly to bespoke, bathroom renovations including wet rooms and walk-in showers, full rewiring to current regulations, replumbing including new boiler and radiator systems, plastering, decoration, tiling, flooring, and complete interior fit-outs.
Because we are based right here in N3, your project manager is never more than a few minutes away. Typical renovation costs in Finchley: kitchen renovation £25,000 to £55,000 depending on specification, bathroom renovation £12,000 to £25,000, structural wall removal with RSJ installation £5,000 to £12,000, whole-house refurbishment from £80,000 upward. Every project comes with a detailed specification and comprehensive quote — no hidden extras, no day rates.
- ARCHITECTURE
In-House Architecture in Finchley
Most builders in Finchley expect you to arrive with architect’s drawings in hand. That means hiring a separate architect, paying their fees, waiting weeks for drawings, then briefing a builder and hoping the two communicate well. It rarely goes smoothly.
LCCL eliminates all of that. Our in-house architects and architectural technicians are part of the same team as our builders. They design what can be built. They understand construction costs as they draw. And because one company is responsible for both design and construction, there is nobody to pass blame to if something does not work — which is exactly why it always does.
Being based in Finchley gives our architects an intimate understanding of the local housing stock and Barnet Council’s planning policies that a practice in central London simply cannot match. We know which streets fall within the Church End Conservation Area. We know what Barnet’s planning officers expect to see in householder applications. We know the structural quirks of the 1930s semis that dominate Woodside Park.
Every project includes: measured survey of your property, concept designs with floor plans and elevations, 3D visualisations so you can see the finished result before committing, detailed construction drawings for building control, planning applications or Lawful Development Certificates as appropriate, structural engineering calculations, and building regulations submissions via LABC. All included in your quote — no separate architect fees.
- LOCA PLANNING EXPERTISE
Planning & Local Knowledge — Finchley
Conservation Areas in Finchley
Finchley has several conservation areas that affect what can be built and how: Church End Conservation Area — Covers the historic heart of Finchley around Hendon Lane and Church End, including St Mary’s Church and surrounding streets. Properties here face restrictions on permitted development rights, meaning most external alterations including loft dormers and extensions require planning permission.
College Farm Conservation Area — Covers the area around the historic College Farm on Fitzalan Road, one of London’s last remaining working farms. Properties nearby may face additional design sensitivity requirements. Properties near the borders of the Hampstead Garden Suburb Conservation Area (which extends into parts of the N2 area near East Finchley) should also be checked for conservation status.
Permitted Development Rights
Most Finchley properties outside conservation areas benefit from full permitted development rights under the General Permitted Development Order. Single-storey rear extensions up to 6 metres deep for detached houses or 4 metres for semi-detached and terraced properties can proceed without planning permission. Rear dormer loft conversions within prescribed volume limits (50 cubic metres for detached and semis, 40 cubic metres for terraces) also qualify. Lawful Development Certificates are recommended to confirm PD status before starting work.
Property Types Across Finchley
North Finchley (N12) — Around Tally Ho Corner, a mix of Edwardian terraces, larger semis, and some commercial-to-residential conversions. Properties along Ballards Lane tend to be three-storey Victorian and Edwardian terraces with good loft conversion potential. Woodside Park (N12) — Dominated by 1930s semi-detached homes with hipped roofs, generous rear gardens, and side access. The ideal property type for hip-to-gable loft conversions and side/rear extensions.
East Finchley (N2) — Victorian and Edwardian cottages and terraces near the high street, transitioning to larger detached homes toward the Heath Extension. The 1930s Cherry Tree Wood estate features distinctive arts-and-crafts influenced housing. West Finchley (N3) — Primarily interwar semis and detached properties, many on wider-than-average plots. Excellent wraparound extension potential. Some properties back onto Dollis Brook with associated planning sensitivities.
Typical Project Timescales in Finchley
Loft conversions: 8 to 12 weeks on site. Single-storey extensions: 10 to 14 weeks. Double-storey extensions: 14 to 20 weeks. Lawful Development Certificates: approximately 8 weeks. Householder planning applications: approximately 8 weeks. Prior approval applications: 42 days. Allow 8 to 12 weeks total for design and approvals before construction starts.
Party Walls
Most Finchley extensions on semi-detached and terraced properties involve party walls. The Party Wall etc. Act 1996 requires formal notification to neighbours before work begins. We manage all 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 a house extension cost in Finchley?
Costs depend on the type and size. Single-storey rear extensions: £50,000 to £90,000. Wraparound extensions: £70,000 to £110,000. Double-storey extensions: £100,000 to £180,000. Side return infills: £40,000 to £60,000. All prices include architectural design, structural engineering, planning, construction, project management, and 10-year LABC warranty.
Do I need planning permission for an extension in Finchley?
Many extensions in Finchley fall under permitted development. Single-storey rear extensions up to 6 metres (detached) or 4 metres (semi/terrace) can proceed without planning permission. We recommend a Lawful Development Certificate to confirm your PD rights. For properties near the Church End Conservation Area or Dollis Brook, additional restrictions may apply — our architects assess this at your free consultation.
How long does a loft conversion take in Finchley?
Typically 8 to 12 weeks on site for a standard dormer or hip-to-gable conversion. Add 8 to 12 weeks before that for architectural design, structural engineering, and approvals. We provide a detailed timeline with your comprehensive quote so you know exactly what to expect.
What type of loft conversion suits my Finchley property?
The 1930s semis in Woodside Park and West Finchley are ideal for hip-to-gable conversions. Victorian and Edwardian terraces near Ballards Lane suit rear dormers. Larger detached homes toward Totteridge Lane can accommodate L-shaped or mansard conversions. We assess your specific property at the free consultation and recommend the best option.
Are you actually based in Finchley?
Yes. Our office is in Finchley N3. We are not a London-wide franchise or a company that claims to be local but operates from the other side of the city. Our team lives and works in this community. Your project manager can be on site in minutes.
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