Award-Winning Design & Build for St Johns Wood’s Finest Properties
St Johns Wood is one of London’s most prestigious residential areas, characterised by large detached villas, elegant mansion blocks, and tree-lined avenues. The properties here are substantial, valuable, and often architecturally significant. Homeowners in NW8 who invest in extensions, loft conversions, or full renovations expect work that matches the quality of the area — and a company that can navigate Westminster City Council’s planning requirements with confidence.
LCCL Construction is an LABC Award-winning design and build company with over 20 years’ experience delivering high-quality residential projects across North and Central London. We provide the complete service in-house: architecture, structural engineering, planning, construction, and project management. One team, one contract, one comprehensive quote covering everything.
Our office is in Finchley N3 — about 20 minutes from St Johns Wood. We work in NW8 because our clients’ properties demand the standard of design and craftsmanship that earned us the LABC Building Excellence Award.
Why St Johns Wood Homeowners Choose LCCL
LABC Building Excellence Award Winners 2024 — Independent recognition of the highest construction standards in the UK, judged by building control professionals.
200+ Reviews Averaging 4.7/5 — A track record built on consistent delivery across hundreds of projects, not a handful of cherry-picked testimonials.
Westminster Planning Experience — Our architects submit applications to Westminster City Council and understand the borough’s approach to residential development in conservation areas.
Complete Design & Build — Architecture, engineering, planning, construction, project management, and 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 St Johns Wood
St Johns Wood’s housing stock presents both opportunity and complexity. The large detached villas on generous plots offer significant scope for extension, but much of NW8 falls within the St Johns Wood Conservation Area, meaning most external alterations require planning permission from Westminster City Council. Extensions must use materials, proportions, and detailing that complement the existing building and respect the character of the area.
Extension Types for St Johns Wood Properties
Rear Extensions — The most common extension type in NW8. Single-storey and double-storey rear additions can add substantial space to St Johns Wood’s large villas without affecting the front elevation. Typical costs: £80,000 to £150,000 for single-storey, £150,000 to £280,000+ for double-storey.
Side Extensions — Many detached properties have sufficient side space for ground-floor or two-storey side additions. Planning approval depends on impact on streetscape and neighbours. Costs: £70,000 to £140,000.
Basement Extensions — With NW8 property values regularly exceeding £2 million, basements are financially viable and particularly suitable for the conservation area context. Westminster has specific subterranean development policies. Costs: £250,000 to £600,000+.
Wraparound Extensions — Combining rear and side elements on larger plots for maximum ground-floor footprint. Costs: £120,000 to £200,000+.
What Is Included in Every Extension Quote
All prices include: in-house architectural design, structural engineering, planning applications to Westminster City Council, heritage and design statements where required, all construction, project management, building control via LABC, and a 10-year LABC warranty. All-inclusive — no hidden extras. Call 020 8037 7332.
- LOFT CONVERSIONS
Loft Conversions in St Johns Wood
Many of St Johns Wood’s substantial detached and semi-detached villas have large roof spaces with excellent conversion potential. A well-designed loft conversion can add a master suite, additional bedrooms, or a home office without affecting the building’s front elevation — which is particularly important in the conservation area context.
Planning permission from Westminster City Council is required for most loft conversions in the St Johns Wood Conservation Area. Proposals that maintain the front roofline and use sensitive design on rear dormers are regularly approved.
Loft Conversion Types for St Johns Wood Properties
Rear Dormer Conversions — A flat-roofed rear dormer maximises headroom and usable space while preserving the front elevation. The most commonly approved type in NW8’s conservation area. Costs: £60,000 to £90,000.
Mansard Conversions — The premium option creating near-full-height rooms. Requires careful design to satisfy Westminster’s conservation officers. Costs: £80,000 to £120,000+.
Hip-to-Gable Conversions — For semi-detached and detached properties with hipped roofs. Combined with a rear dormer for maximum room. Costs: £65,000 to £95,000.
Rooflight-Only Conversions — Where dormer additions are unlikely to receive approval, conservation-style flush rooflights create a functional room without altering the roofline. Costs: £45,000 to £65,000.
What Is Included in Every Loft Conversion Quote
All prices include: in-house architectural design, structural engineering, planning applications to Westminster City Council, scaffolding, all construction, staircase, insulation, plastering, electrics, en-suite plumbing, building control via LABC, project management, and a 10-year LABC warranty. No hidden extras. Call 020 8037 7332.
- RENOVATIONS
Renovations in St Johns Wood
The large villas and mansion block apartments of St Johns Wood often require comprehensive renovation to bring them up to contemporary standards while preserving their period character. Renovation work in NW8 frequently includes structural reconfiguration — opening up ground floors, relocating kitchens, creating en-suites — alongside full rewiring, replumbing, new heating systems, and high-specification kitchen and bathroom installations.
For properties within the conservation area, external renovation elements such as window replacement, re-rendering, and façade restoration may require planning permission. For listed buildings, even internal alterations can require Listed Building Consent. Our architects manage all necessary applications.
LCCL delivers complete renovations from structural shell to finished interior. Typical costs in St Johns Wood: kitchen renovation £40,000 to £85,000, bathroom renovation £18,000 to £40,000, structural reconfiguration £10,000 to £20,000, whole-house refurbishment from £150,000 upward. Detailed quotes — no day rates. Final costs confirmed once designs are agreed.
- ARCHITECTURE
In-House Architecture — Westminster Planning Expertise
St Johns Wood straddles the boundary between Westminster City Council and, for some addresses, Camden Council. Westminster’s planning policies, design expectations, and application processes differ significantly from those in other boroughs, and the St Johns Wood Conservation Area adds additional design requirements.
LCCL’s in-house architects submit applications to Westminster regularly and understand the borough’s expectations for householder applications, conservation area proposals, and basement development. The integrated design and build model means our architects design with construction costs and buildability in mind — no beautiful drawings that blow the budget when priced.
Every St Johns Wood project includes: measured survey, concept designs, 3D visualisations, construction drawings, planning applications to Westminster City Council, heritage and design statements as required, structural engineering, and building regulations via LABC. All included in your quote — no separate architect fees.
- LOCA PLANNING EXPERTISE
Planning & Local Knowledge — St Johns Wood
Planning Authority
Most of St Johns Wood falls within Westminster City Council. Some addresses toward the northern edge of NW8 may fall within the London Borough of Camden. Our architects confirm the correct authority for each property and submit applications accordingly.
St Johns Wood Conservation Area
Much of St Johns Wood is covered by the St Johns Wood Conservation Area, protecting the area’s distinctive character of large detached villas, mature tree-lined streets, and spacious plots. Permitted development rights are restricted, and most external alterations require planning permission. Applications must demonstrate sensitivity to the conservation area’s character, use appropriate materials, and maintain established building lines and plot layouts.
Listed Buildings & Heritage
St Johns Wood contains a number of listed buildings, including individual villas and distinctive mansion blocks. Any work to a listed building requires Listed Building Consent from Westminster City Council, covering both external and internal alterations.
Basement Development
Westminster City Council has adopted specific policies on basement development following significant development pressure in areas like NW8. Proposals for new basements or basement extensions require structural method statements, construction traffic management plans, and assessments of impact on drainage and neighbouring properties. Single-storey basements are generally more achievable than multi-level excavations.
Typical Planning Timescales
Householder planning application: 8-week target decision. Listed Building Consent: 8 weeks. Pre-application advice: available and recommended for complex proposals. Full planning application: 8 to 13 weeks depending on complexity. 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
Do I need planning permission for an extension in St Johns Wood?
In most cases yes. Much of NW8 falls within the St Johns Wood Conservation Area where permitted development rights are restricted. Planning permission from Westminster City Council is required for most extensions. Our architects handle all applications.
How much does an extension cost in St Johns Wood?
Rear extensions: £80,000 to £150,000. Double-storey: £150,000 to £280,000+. Basement extensions: £250,000 to £600,000+. All LCCL prices include architecture, structural engineering, planning, construction, project management, and 10-year LABC warranty.
Can I do a loft conversion in St Johns Wood?
Yes. Loft conversions are regularly approved in NW8. Rear dormers that preserve the front roofline are the most commonly approved type. Planning permission from Westminster is required. Our architects design proposals that satisfy conservation officers.
How much does a loft conversion cost in St Johns Wood?
Rear dormers: £60,000 to £90,000. Hip-to-gable: £65,000 to £95,000. Mansard: £80,000 to £120,000+. All prices include architecture, engineering, planning, construction, and 10-year LABC warranty.
Do you build basements in St Johns Wood?
Yes. Basement extensions are a practical way to add significant space in NW8 without altering the external appearance. Westminster has specific policies on basement development which our team manages from design through to completion.
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