Award-Winning Design & Build in Hendon
Award-Winning Builders Serving Hendon, Mill Hill & Colindale LCCL Construction serves Hendon, Mill Hill, Cricklewood, Colindale and the surrounding NW4 and NW7 areas from our base in Finchley N3 — less than 10 minutes from most Hendon addresses. We have been transforming homes across this part of North West London for over 20 years, from compact terraced house extensions to full-scale refurbishments of substantial detached properties along The Ridgeway. Choosing the right builder in Hendon matters more than most homeowners realise.
Why Hendon Homeowners Choose LCCL
A London-wide company sending a team from the other side of the city will not know that Mill Hill Conservation Area has strict controls on roof alterations, or that the Victorian properties near Brent Street sit on different foundations from the 1930s semis around Hendon Central. A loft-only company can convert your roof space but cannot build the ground-floor extension you might want next year. With LCCL, you get a full design and build company — architecture, structural engineering, planning, construction, and project management — all under one roof. No subcontractors you have never met turning up on site. No finger-pointing between architect and builder. One team accountable for everything.
LABC Building Excellence Award Winners 2024 — Independent verification that our design and construction quality meets the highest national standards. Ask any competitor in Hendon for their LABC Award — they will not have one.
200+ Reviews Averaging 4.7 out of 5 — Real homeowners across Hendon, Mill Hill, and North London who trusted us with their most valuable asset.
Based 10 Minutes Away in Finchley N3 — We are on your doorstep, not the other side of London. When your project manager says they will be there in the morning, they arrive in the morning.
Complete Design & Build Including Everything — Architecture, structural engineering, planning, 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 Hendon
The varied housing stock across Hendon and Mill Hill creates opportunities for almost every type of house extension. The larger plots in Mill Hill Village and along The Ridgeway suit substantial double-storey and wraparound extensions. The 1930s semis around Hendon Central and West Hendon are ideal for rear and side extensions that create open-plan family living spaces. The Victorian terraces near Brent Street benefit from rear extensions that transform narrow galley kitchens into generous kitchen-diners.
In an area where moving to a larger property means finding several hundred thousand pounds in stamp duty and additional purchase price, extending your current Hendon home is a far more cost-effective way to get the space your family needs.
Extension Types We Build in Hendon
Single-Storey Rear Extensions — The most popular project across NW4 and NW7. Permitted development allows extensions up to 6 metres deep for detached houses and 4 metres for semi-detached and terraced properties, without planning permission. We design kitchen-diners that completely open up the ground floor to the garden, typically with bifold or sliding doors. Costs: £50,000 to £90,000 depending on depth and specification.
Wraparound Extensions — Combining a side return with a rear extension to maximise the ground-floor footprint. Particularly effective on the wider-fronted semis in Hendon and the detached homes in Mill Hill. Creates an L-shaped or full-width living space. Costs: £70,000 to £110,000.
Double-Storey Extensions — For families in Mill Hill and Hendon who need both ground-floor living space and first-floor bedrooms. Adds 40 to 60 square metres across two floors. Costs: £100,000 to £180,000.
Basement Conversions and Extensions — The larger detached properties along The Ridgeway, Holders Hill Road and Parson Street have scope for basement extensions that unlock significant additional space below ground. High property values in Mill Hill make this investment worthwhile. Costs: from £150,000.
What Is Included in Every Extension Quote
All prices include: in-house architectural design, structural engineering calculations, planning applications or Lawful Development Certificates as appropriate, all construction labour and materials, steelwork, foundations, project management, building control via LABC, and a 10-year LABC warranty. No hidden extras. No surprise invoices during the build. The number we quote is what you pay. Call 020 8037 7332 for a free consultation at your property.
- LOFT CONVERSIONS
Loft Conversions in Hendon
Loft conversions are hugely popular across Hendon and Mill Hill because they add valuable bedroom and bathroom space without sacrificing any garden area. The 1930s semis that dominate much of NW4 have hipped roofs with generous ridge heights — ideal for hip-to-gable conversions that create substantial usable floor areas. The larger detached homes in Mill Hill Village often have roof volumes big enough for two-bedroom loft conversions.
A well-executed conversion typically adds 15 to 25 percent to your property value. Most loft conversions in Hendon qualify under permitted development rights. Properties within the Mill Hill Conservation Area or Hendon Church End Conservation Area face additional restrictions, particularly for front-facing alterations — but our architects know exactly what is achievable in each area.
Loft Conversion Types for Hendon Properties
Dormer Conversions — The most versatile option. A rear flat-roof dormer suits both terraces and semis, creating a spacious bedroom with en-suite while keeping changes invisible from the street. Costs: £45,000 to £65,000.
Hip-to-Gable Conversions — The preferred choice for the 1930s semis around Hendon Central, Queens Road, and Brent Street. Extends the hipped roof to a full vertical gable wall, adding 30 to 40 percent more usable floor space than a dormer alone. Usually combined with a rear dormer. Costs: £50,000 to £70,000.
L-Shaped Dormer Conversions — Combines rear and side dormers for semi-detached and end-of-terrace homes. Creates enough space for two bedrooms or a master suite with dressing area and en-suite. Costs: £55,000 to £75,000.
Mansard Conversions — The premium option for period properties near Hendon Central station and Brent Street. Replaces the existing roof to create almost a full additional storey with near-vertical walls and maximum headroom. Always requires planning permission. Costs: £65,000 to £85,000.
What Is Included in Every Loft Quote
All prices include: in-house architectural design, structural engineering, scaffolding, all construction including steelwork and dormer or gable build, new staircase, insulation, plastering, electrics, plumbing for en-suite bathroom, building control via LABC, project management, and a 10-year LABC warranty. No hidden extras. Call 020 8037 7332 to discuss your loft.
- RENOVATIONS
Renovations in Hendon & Mill Hill
The housing across Hendon and Mill Hill spans nearly a century of building styles, and each type presents different renovation opportunities. The Victorian terraces near Brent Street and Hendon Central often have original sash windows, period plasterwork and characterful layouts that benefit from sensitive modernisation — upgrading kitchens, bathrooms and heating systems while preserving the features that give these homes their charm.
The 1930s semis around Queens Road and West Hendon typically have separate front reception rooms, small rear dining rooms and compact kitchens that are ready for structural reconfiguration into open-plan family living spaces. The substantial detached properties along The Ridgeway and in Mill Hill Village sometimes need comprehensive refurbishment after decades of piecemeal changes, requiring a complete rethink of layout, services and finishes.
LCCL Construction handles all of this. Our renovation service covers structural alterations including load-bearing wall removal with RSJ installation, complete kitchen and bathroom installations at every price point, full rewiring to current regulations, replumbing including boiler replacement and radiator upgrades, plastering, decoration, tiling, flooring, and complete interior fit-outs. We coordinate every trade under one project manager — you deal with one person, not a dozen separate contractors.
Typical renovation costs in Hendon: kitchen renovation £25,000 to £55,000, bathroom renovation £12,000 to £25,000, structural wall removal with steel beam £5,000 to £12,000, whole-house refurbishment from £80,000 upward. Every project comes with a detailed specification and comprehensive quote. Final costs confirmed once designs are agreed.
- ARCHITECTURE
In-House Architecture in Hendon
Hiring an architect separately from your builder is one of the most common mistakes Hendon homeowners make. The architect designs without understanding construction costs, so the quote comes in over budget. The builder interprets the drawings differently from the architect’s intention, creating arguments about who pays for changes. And if something goes wrong, the architect blames the builder and the builder blames the architect. You are left in the middle, paying for both. LCCL eliminates all of that.
Our in-house architects and architectural technicians design every project with full knowledge of what it will cost to build, because they work alongside the builders who will construct it. The design stage and the construction stage are managed by the same company, the same team, and the same project manager.
In Hendon and Mill Hill, this integrated approach is particularly valuable because the area straddles several distinct planning environments. Properties on the Barnet side follow Barnet Council’s planning policies. The Victorian and Edwardian properties near Brent Street sit within the Hendon Church End Conservation Area with its own design requirements. Mill Hill Conservation Area has strict controls on roof alterations that affect loft conversion design. Our architects know each of these environments because they work in them every week — not once a year.
Every project includes: measured survey, concept designs, 3D visualisations, detailed construction drawings, planning applications or LDCs, structural engineering, and building regulations submissions. All included in your quote — no separate architect fees, no hourly rates.
- LOCA PLANNING EXPERTISE
Planning & Local Knowledge — Hendon
Conservation Areas Affecting Hendon & Mill Hill
Several conservation areas affect properties across NW4 and NW7. Mill Hill Conservation Area — Covers the historic village centre around The Ridgeway, Milespit Hill, Lawrence Street, and Hammers Lane. Properties within this area face significant restrictions on permitted development, particularly for loft conversions and any alterations visible from the street. Roof materials, window proportions, and extension designs must be sympathetic to the village character.
Hendon Church End Conservation Area — Covers the area around St Mary’s Church, Church Road, and the historic core of Hendon near Greyhound Hill. Extensions and loft conversions visible from the street require planning permission and must demonstrate design sensitivity.
Golders Green Conservation Area — Extends into parts of NW4 near the Golders Green border, affecting properties around Finchley Road and surrounding streets. Hampstead Garden Suburb Conservation Area — While primarily in NW11, properties on the eastern edge of NW7 near the Garden Suburb border should check whether they fall within this tightly controlled conservation area.
Permitted Development & Property Types
Outside conservation areas, standard PD rights apply across Hendon and Mill Hill. Detached houses can extend up to 6 metres to the rear, semi-detached and terraced up to 4 metres, without planning permission. Rear dormer loft conversions within volume limits also qualify. We recommend obtaining a Lawful Development Certificate to confirm PD eligibility before starting work.
Property Types: Hendon Central and Queens Road — Predominantly 1930s semi-detached houses with hipped roofs, bay windows and rear gardens. Ideal for hip-to-gable loft conversions and rear extensions. Brent Street and Church Road — Victorian and Edwardian terraces and semis. West Hendon — Interwar housing with extension potential. Mill Hill Broadway — A mix of 1930s semis and postwar housing with good plot sizes. Mill Hill Village and The Ridgeway — Larger detached properties on substantial plots within the conservation area. Colindale — Significant new-build development alongside remaining interwar housing.
Typical Project Timescales
Loft conversions: 8 to 12 weeks on site. Single-storey extensions: 10 to 14 weeks. Double-storey extensions: 14 to 20 weeks. LDCs: approximately 8 weeks. Householder planning applications: approximately 8 weeks. Design and approvals phase: 8 to 12 weeks before construction starts.
Party Walls
Most Hendon 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.
Typical Planning Timescales
LDCs: approximately 8 weeks. Householder planning applications: approximately 8 weeks. Prior approval: 42 days. Building control: inspections throughout construction, final sign-off at completion.
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 Hendon?
Rear extensions: £50,000 to £90,000. Wraparound extensions: £70,000 to £120,000. Double-storey extensions: £100,000 to £180,000. All LCCL prices include architectural design, structural engineering, planning, construction, project management, and 10-year LABC warranty. One comprehensive quote — no hidden extras.
Do I need planning permission for a loft conversion in Hendon?
Most loft conversions in Hendon qualify under permitted development. However, properties in Mill Hill Conservation Area face stricter controls on roof alterations and may need planning permission. Mansard conversions always need planning permission. Our architects assess your specific property and handle all applications if required.
How long does an extension take to build in Hendon?
Single-storey rear extensions: 10 to 14 weeks on site. Double-storey extensions: 14 to 20 weeks. Before construction, allow 8 to 12 weeks for design, structural engineering, and approvals. We give you a detailed timeline at quotation stage.
Is LCCL local to Hendon?
Yes. We are based in Finchley N3, less than 10 minutes from most Hendon addresses. We have been working across the NW4 and NW7 areas for over 20 years. Our project managers are on your doorstep, not across London.
What types of properties do you work on in Hendon?
All residential property types: Victorian terraces near Brent Street, 1930s semis around Hendon Central, the larger detached homes along The Ridgeway and Sunny Hill Park, postwar properties in Colindale, and newer developments around the Welsh Harp. Each property type has different structural characteristics and we design accordingly.
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