Award-Winning Design & Build for Hampstead’s Premium Properties
Hampstead is one of London’s most architecturally sensitive areas. Georgian villas, Victorian townhouses, listed buildings, and conservation area restrictions make building here more complex than almost anywhere else in the capital. The homeowners who invest in extending or converting their Hampstead properties need a company that understands both the technical challenges and the planning landscape — and delivers work to a standard that matches the quality of the area.
LCCL Construction is an LABC Award-winning design and build company with over 20 years’ experience working on period and premium properties across North London. We deliver house extensions, loft conversions, renovations, and architectural services with a fully in-house team — architects, structural engineers, project managers, and experienced builders working under one roof, one contract, and one comprehensive quote.
We work in Hampstead because our clients’ properties demand the level of care and craftsmanship we deliver. Our office is in Finchley N3, about 15 minutes from most NW3 addresses.
Why Hampstead Homeowners Choose LCCL
LABC Building Excellence Award Winners 2024 — The UK’s most respected independent recognition of construction quality and building regulation compliance.
200+ Reviews Averaging 4.7/5 — Over 200 verified reviews from homeowners across North London. That volume demonstrates consistency, not just the occasional good project.
Conservation Area & Listed Building Experience — We work regularly in conservation areas and understand the additional planning requirements, heritage statements, and design sensitivity they demand.
Complete Design & Build — Architecture, structural engineering, planning, construction, project management, and 10-year LABC warranty. One quote, one contract, 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 Hampstead — Designed for Period Properties
Extending a Hampstead property is rarely straightforward. Almost the entire area falls within the Hampstead Conservation Area, which means permitted development rights are significantly restricted. Most extensions require full planning permission from Camden Council, and proposals must demonstrate sensitivity to the conservation area’s character. For listed buildings, Listed Building Consent adds a further layer of complexity.
Despite these constraints, well-designed extensions are regularly approved in Hampstead. The key is architectural expertise — understanding what Camden’s planning officers expect, designing proposals that respect the existing building’s proportions and materials, and presenting applications with the supporting documentation the conservation team requires.
Extension Types for Hampstead Properties
Rear Extensions — The most achievable extension type in Hampstead’s conservation area. Single-storey rear additions in matching materials are generally well received by Camden’s planners. For Georgian and Victorian properties, rear extensions can create generous kitchen-dining spaces while preserving the front elevation. Costs: £65,000 to £120,000.
Side Return Extensions — Many Victorian terraces have narrow side passages that can be incorporated into the ground floor. Particularly effective when combined with rear extensions. Costs: £50,000 to £75,000.
Basement Extensions — Increasingly popular where property values justify the investment and plot constraints limit above-ground expansion. Camden has specific policies on basement development. Costs: £200,000 to £500,000+.
Double-Storey Extensions — Achievable on larger detached and semi-detached properties away from the most sensitive conservation sub-areas. Require full planning permission. Costs: £130,000 to £250,000+.
What Is Included in Every Extension Quote
All prices include: in-house architectural design, structural engineering, planning applications to Camden Council, heritage and design statements where required, all construction labour and materials, 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 Hampstead — Conservation Area Expertise
Loft conversions in Hampstead require careful planning because the entire area sits within the Hampstead Conservation Area. Permitted development rights for roof alterations are removed, meaning any dormer, roof extension, or visible roof change requires full planning permission from Camden Council. For listed buildings, Listed Building Consent is also required.
That said, loft conversions are regularly approved in Hampstead — the key is sensitive design. Camden’s planners will approve conversions that don’t harm the roofscape or the character of the conservation area. Rear dormers that aren’t visible from the street, rooflights set flush with the roof slope, and conversions that maintain the original roofline from the front are all achievable.
Loft Conversion Types for Hampstead Properties
Rear Dormer Conversions — The most common approved design in Hampstead’s conservation area. Preserves the front roofline and streetscape. Camden will assess size, materials, and proportions carefully. Costs: £55,000 to £80,000.
Mansard Conversions — The premium option creating near-full-height rooms. Requires planning permission and very careful design. Best suited to Victorian terraces where the mansard form is already established local character. Costs: £75,000 to £110,000+.
Rooflight-Only Conversions — For properties where dormers are unlikely to receive approval — typically listed buildings or those on the most sensitive streets. Lower headroom but avoids contentious planning issues. Costs: £40,000 to £60,000.
L-Shaped Dormers — Where the property and conservation area context allow, combining rear and side elements maximises loft floor area. More likely approved on larger detached or semi-detached properties set back from the street. Costs: £70,000 to £100,000.
What Is Included in Every Loft Conversion Quote
All prices include: in-house architectural design, structural engineering, planning applications to Camden Council, heritage statements, scaffolding, all construction including steelwork and dormer build, 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 Hampstead — Restoring and Modernising Period Properties
Hampstead’s housing stock includes some of London’s finest Georgian and Victorian properties, many of which have been lived in for generations and are due for comprehensive modernisation. Full renovation often involves structural reconfiguration, complete kitchen and bathroom installations at premium specification, rewiring and replumbing, heating system upgrades, insulation improvements, and restoration of period features including cornicing, panelling, fireplaces, and original joinery.
For listed buildings, interior renovation work may require Listed Building Consent — particularly where original features are being altered. Our architects understand these requirements and design renovation schemes that satisfy Camden Council’s conservation officers while delivering modern functionality.
LCCL delivers full renovations from structural shell to finished interior. One team, one project manager, one comprehensive quote. Typical renovation costs in Hampstead: kitchen renovation £35,000 to £75,000, bathroom renovation £15,000 to £35,000, structural reconfiguration with steelwork £8,000 to £18,000, whole-house refurbishment from £120,000 upward.
- ARCHITECTURE
In-House Architecture — Conservation Area & Listed Building Specialists
Hampstead’s planning environment demands architectural expertise that goes beyond standard residential design. The conservation area restrictions, listed building requirements, and Camden Council’s design expectations mean that planning applications need to be thorough, well-documented, and sensitive to the local context. A poorly prepared application wastes months and risks refusal.
LCCL’s in-house architects submit applications to Camden Council regularly and understand the borough’s approach to householder applications, conservation area proposals, and listed building consent. The integrated design and build model means our architects design with construction costs and buildability in mind from day one.
Every Hampstead project includes: measured survey, concept designs with floor plans and elevations, 3D visualisations, construction drawings, planning applications to Camden Council, heritage statements and design and access 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 — Hampstead
Planning Authority
Hampstead falls within the London Borough of Camden. All planning applications for NW3 properties are submitted to Camden Council’s planning department. Camden receives the second highest number of planning applications in London, and the Hampstead area generates an exceptionally high proportion of these.
Hampstead Conservation Area
Almost all of Hampstead is within the Hampstead Conservation Area, one of London’s largest and most strictly protected. The conservation area is divided into eight character sub-areas: Heath Street and High Street, Christ Church and Well Walk, Willoughby Road and Downshire Hill, Church Row and Hampstead Grove, Frognal, Branch Hill and Oak Hill, Whitestone Pond, and the outlying areas.
Permitted development rights are significantly restricted throughout. Most external alterations — including extensions, dormers, replacement windows, and changes to boundaries — require planning permission. Applications must demonstrate that proposals preserve or enhance the character and appearance of the conservation area.
Listed Buildings
Hampstead has one of the highest concentrations of listed buildings in London. Grade I, Grade II*, and Grade II listed properties are scattered throughout. Any work to a listed building — including internal alterations — requires Listed Building Consent from Camden Council. Our architects prepare Listed Building Consent applications alongside planning applications where both are required.
Basement Development
Camden Council has adopted specific policies on basement development following concerns about the impact of large-scale basement excavations on neighbours and local infrastructure. Basement proposals in Hampstead require structural method statements, construction management plans, and assessments of impact on drainage and neighbouring properties. Our team manages the entire process.
Typical Planning Timescales
Householder planning application: 8-week target decision. Listed Building Consent: 8 weeks. Pre-application advice: available from Camden, recommended for complex proposals. Full planning application: 8 to 13 weeks depending on complexity. Building control: inspections throughout, final sign-off at completion.
Building Control
All LCCL projects are managed through LABC building control. Inspections at each key stage of construction 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 Hampstead?
Almost certainly yes. Hampstead is within a conservation area where permitted development rights are restricted. Most external alterations require planning permission from Camden Council. For listed buildings, Listed Building Consent is also required. Our architects handle all applications and have extensive experience with Camden’s planning process.
How much does an extension cost in Hampstead?
Rear extensions: £65,000 to £120,000. Side return extensions: £50,000 to £75,000. Double-storey extensions: £130,000 to £250,000+. Basement extensions: £200,000 to £500,000+. All LCCL prices include architecture, structural engineering, planning, construction, project management, and 10-year LABC warranty.
Can I convert my loft in Hampstead’s conservation area?
Yes — loft conversions are regularly approved in Hampstead. Rear dormers and sensitive designs that preserve the front roofline and streetscape are generally achievable. Planning permission from Camden is required. Our architects design proposals that satisfy conservation officers and achieve approval.
How much does a loft conversion cost in Hampstead?
Rear dormers: £55,000 to £80,000. Mansard conversions: £75,000 to £110,000+. Rooflight-only conversions: £40,000 to £60,000. All prices include architecture, structural engineering, planning, construction, and 10-year LABC warranty.
Do you work on listed buildings?
Yes. We have experience working on listed buildings and understand the additional requirements for Listed Building Consent. Our architects prepare applications that satisfy Camden Council’s conservation team while delivering the functional improvements our clients need.
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