Premium Builders in Hampstead
Exquisite extensions, bespoke renovations and meticulously crafted conversions for Hampstead's grand Georgian townhouses and period properties.
Builders in Hampstead, NW3
Hampstead represents the pinnacle of North London living — a rarefied enclave of elegant Georgian townhouses, stately Victorian villas and distinguished period residences set among the rolling expanses of Hampstead Heath. Within the London Borough of Camden, this internationally renowned neighbourhood demands construction work of the very highest calibre. Alstruct Ltd delivers an ultra-premium service tailored to the exacting standards of Hampstead's most discerning homeowners, combining heritage expertise with contemporary luxury.
The magnificent properties gracing roads such as Church Row, Well Walk, Fitzjohns Avenue and the exclusive Bishops Avenue command some of London's highest valuations, and investment in bespoke construction work must reflect this prestige. Alstruct specialises in the sensitive enhancement of Hampstead's architectural treasures — from meticulously restoring Georgian proportions and period detailing to creating breathtaking contemporary additions that sit harmoniously alongside historic fabric. Our portfolio encompasses luxury basement excavations, exquisite rear extensions, premium whole-house renovations and bespoke loft conversions, all executed with the finest materials and uncompromising craftsmanship.
With Hampstead station on the Northern line providing direct access to the City and West End, and the cultural richness of Hampstead Village at your doorstep, property here remains perennially desirable. Alstruct's specialist team navigates the complex planning landscape of Camden Council with confidence, including Listed Building Consent applications, conservation area negotiations and the sensitive handling of heritage assets. Every project benefits from our design team, working with your architect or ours, and a dedicated project manager.
Why Choose Alstruct in Hampstead?
- Specialists in listed buildings, Georgian townhouses and heritage properties
- Expert navigation of Camden Council planning and Hampstead Conservation Area
- CHAS Elite, Constructionline Gold & Federation of Master Builders certified
- Complimentary consultation with bespoke, comprehensive quotation
- Dedicated senior project manager for every premium project
- Our design team, working with your architect or ours and a structural engineer
- Access to finest materials, specialist craftsmen and heritage tradespeople
- Proven track record with ultra-high-net-worth clients in NW3
Luxury Construction in Hampstead
Extensions in Hampstead
Exquisite rear and side extensions for Georgian and Victorian properties, designed to complement heritage architecture with contemporary refinement.
Learn more →Loft Conversions in Hampstead
Premium mansard and dormer conversions creating opulent additional floors within Hampstead's grand period properties.
Learn more →Renovations in Hampstead
Comprehensive luxury renovations restoring Georgian elegance and Victorian grandeur while seamlessly integrating modern luxury throughout.
Learn more →Basement Conversions in Hampstead
Bespoke basement excavation creating premium subterranean spaces including pools, cinemas, wine cellars and multi-room living areas.
Learn more →Groundworks in Hampstead
Specialist foundations, underpinning and structural engineering for Hampstead's complex heritage and hillside construction projects.
Learn more →Landscaping in Hampstead
Bespoke garden design, premium natural stone terracing and elegant outdoor entertaining spaces befitting Hampstead's finest residences.
Learn more →House and kitchen extensions in Hampstead
Hampstead has Georgian and Victorian houses around the Village and Flask Walk, Arts and Crafts houses towards Hampstead Garden Suburb, and large mansion flats along Finchley Road and in Belsize Park. Hampstead extensions are often lower-ground and basement projects, rear extensions with garden glazing, and orangery-style additions to the villas; we check early whether a site is in one of the conservation areas.
As a guide, a well-built single-storey rear or side-return extension in Hampstead costs around £2,500–£4,000 per m² including structure, glazing and finishes, so a typical 25–30 m² kitchen extension lands between £75,000 and £120,000. Our house extension cost guide explains what moves the price. Hampstead, Fitzjohns and Netherhall, and Belsize are conservation areas, and Camden Council applies a detailed basement policy and Article 4 directions. We confirm permitted development rights at the first visit and handle any application to Camden Council through our design team, working with your architect or ours.
Planning a kitchen extension? See our kitchen extensions page for layouts, glazing and costs.
Loft conversions in Hampstead
Hampstead roofs range from Georgian butterfly roofs with little space to Victorian villas with room for two loft rooms; mansards and rear dormers are agreed with the council's conservation officers.
In London a Velux conversion costs £25,000–£45,000, a dormer loft with a bedroom and en-suite £45,000–£75,000 and a mansard £60,000–£100,000+; our loft conversion cost guide sets out what is included. We survey the roof structure, head height and stair position before we quote a Hampstead loft, so the figure reflects the actual roof rather than an assumption.
Renovations and refurbishment in Hampstead
Hampstead projects are high-specification refurbishments of period houses and lateral flats, including apartment renovations in Belsize Park mansion blocks. Typical Hampstead refurbishments include structural openings with steel beams, new kitchens and bathrooms, rewiring, heating and period repairs such as sash windows, cornices and floors. Our Victorian terrace renovation cost guide gives realistic budgets, and every Hampstead project runs on a JCT contract with a written specification and our 10-year workmanship warranty.
Guides for homes in Hampstead
For the period townhouses, mews and conservation areas of Hampstead, our most useful guides are mansard loft conversion costs, basement conversion costs, extending in a conservation area, leaking lead roof valleys and damp basements and tanking.
Planning approvals in Hampstead
Camden Council approved 87.6% of householder planning applications decided between September 2025 and August 2026, against a London average of 85.8%; a typical decision took about 9.1 weeks from validation. Extensions were approved 89.5% of the time.
See how every London borough compares, including loft and extension approval rates, in our 2026 London planning approvals study.
Alstruct projects near Hampstead
Golders Green 1930s Semi, NW11
Rear extension, two-storey side extension and full renovation of a 1930s semi-detached house.
View project →Archway Victorian Terrace, N19
Full Victorian terrace renovation and rear extension with triple glazing and aluminium sliding doors.
View project →Finchley Two-Storey Bay, N3
A two-storey front bay rebuilt from cill level with load-bearing posts and a welded steel ring beam.
View project →Beyond the projects above, we have recent and current sites in W14, W6, N6, NW8, NW6, W11 and W12 within about five miles of Hampstead, and we work across every London borough from our office in South Woodford, E18. See all completed projects →
Common questions about building in Hampstead
Do I need planning permission for an extension in Hampstead?
Houses (not flats or maisonettes) keep national permitted development rights for a single-storey rear extension of 3m attached or 4m detached, up to 6m or 8m with prior approval, and most rear dormers within 40 or 50 cubic metres. Parts of NW3 lie in Camden conservation areas: Hampstead, Fitzjohns/Netherhall, Redington/Frognal, Belsize, South Hill Park Estate and West End Green. These keep single-storey rear rights but remove side extensions, two-storey rear extensions, cladding and roof additions. Article 4 directions on scheduled houses in the Hampstead and Belsize areas also control main elevations, roofs, hard surfaces and boundary walls, and any basement needs permission from Camden Council.
What does Camden Council expect for a basement in Hampstead?
Since 1 June 2017 a borough-wide Article 4 direction has meant that every basement in Camden needs planning permission. Camden Local Plan 2017 Policy A5 limits the scale and impact of basements, and Camden Planning Guidance: Basements asks for a Basement Impact Assessment covering drainage, flooding, groundwater and structural stability, prepared by a chartered engineer or geologist and generally audited independently. A new Local Plan with a draft basement policy (D6) is at main modifications consultation until 23 November 2026 and is not yet adopted.
What does a basement conversion cost in Hampstead?
For Hampstead's villas and townhouses, converting an existing cellar typically costs £2,500–£4,000 per m², about £80,000–£150,000 for 30–40 m², while a full excavation costs £4,500–£6,500 per m². All of these figures exclude VAT. Access, ground conditions and depth of dig move the price, and in Camden the planning application and Basement Impact Assessment come first. Our basement conversion cost guide breaks the figures down.
Which Alstruct projects are nearest to Hampstead?
Golders Green 1930s Semi, NW11, about 1.7 miles away, combined a rear extension, a two-storey side extension and a full renovation of a 1930s semi. Archway Victorian Terrace, N19, about 2 miles away, was a full Victorian terrace renovation with a rear extension, triple glazing and aluminium sliding doors. At Finchley Two-Storey Bay, N3, about 3.1 miles away, we rebuilt a two-storey front bay from cill level with load-bearing posts and a welded steel ring beam.
Which parts of Hampstead do you cover?
We cover the NW3 district: Hampstead Village and Flask Walk, Fitzjohns, Frognal, Belsize Park and the mansion blocks along Finchley Road, out towards Hampstead Garden Suburb. Hampstead is in the London Borough of Camden. Our office is in South Woodford E18, about 9 miles away. We also have pages for Highgate, Camden and Finchley.
Nearby areas we cover
Alstruct works across every London borough. Here are areas close to Hampstead with dedicated local pages: