Basement Conversions in Hampstead, NW3
Cellar and basement conversions in Hampstead: dry, habitable rooms below ground with designed waterproofing, natural light and building control approval.
Covered under one contract
- Structural design and calculations
- Planning or lawful development certificate
- New staircase, dormer and roof windows
- Insulation, fire safety and building control
- En-suite designed and fitted
- Waterproofing with guarantee for basements
Basement Conversions in Hampstead.
Where a house cannot grow outwards or upwards, it can grow downwards. Many of the older houses in Hampstead already have a cellar or vaults, and converting them into a usable floor is a well-established route to a utility room, guest suite, study or cinema room.
The two things that decide whether a basement works are waterproofing and light. We use a designed system, normally a cavity drainage membrane with a sump and pump, which carries a guarantee, and we bring light in through a lightwell or a rear opening where the site allows. Ceiling height, drainage and structure are all surveyed at the outset.
Converting an existing cellar without changing the exterior of the house does not usually need planning permission. Lightwells, listed buildings and new excavation do, and the central London boroughs have their own basement policies with impact assessments. All basements need building regulations approval and most involve party wall notices, which we prepare and serve.
- Area
- Hampstead, NW3
- Council
- London Borough of Camden
- Housing
- Georgian and Regency houses in the village, large Victorian and Edwardian houses on the Fitzjohns and Redington estates, Arts and Crafts houses, converted flats
- Transport
- Hampstead (Northern), Hampstead Heath (Overground)
- Basement, existing cellar
- 10 to 16 weeks
- Consent
- Often permitted development for lofts
- Waterproofing
- Guaranteed system, designed for the site
Hampstead: the houses and the planning rules.
Hampstead is a village on a hill with the Heath beside it: Georgian houses on Church Row and Flask Walk, red-brick Victorian mansions on Fitzjohns Avenue, Arts and Crafts houses on the Redington estate and a scatter of modernist infill. The housing is large, the plots are steep and irregular, and almost all of it is in a conservation area.
Projects in Hampstead tend to be substantial: whole-house refurbishments with basements, rear extensions that negotiate a sloping garden, and lofts within the tall Victorian roofs. Camden's conservation officers take the village character seriously, so we invest in the design and the heritage case before submitting anything.
The Hampstead Conservation Area covers the village and its surroundings, with Fitzjohns/Netherhall and Redington/Frognal alongside.
London Borough of Camden
Camden decides applications and applies Article 4 directions across much of Hampstead, removing permitted development for extensions, roof changes and front alterations.
Basements
Camden's basement policy requires a Basement Impact Assessment covering ground conditions, drainage and neighbouring structures, and limits depth and footprint.
Heath and trees
Tree preservation orders and Heath views are material considerations on many streets; we survey trees early.
Approvals for basement conversions in Hampstead.
Converting an existing cellar without altering the exterior does not usually need planning permission; lightwells, listed buildings and new excavation do. Every basement needs building regulations approval and a designed waterproofing system, and most involve party wall notices.
Camden decides applications and applies Article 4 directions across much of Hampstead, removing permitted development for extensions, roof changes and front alterations.
What basement conversions in Hampstead includes.
- Structural design and calculations
- Planning or lawful development certificate
- New staircase, dormer and roof windows
- Insulation, fire safety and building control
- En-suite designed and fitted
- Waterproofing with guarantee for basements
From site visit to handover.
- 01
Site visit & consultation
We visit, listen and measure. Brief, budget and constraints understood before any advice is given.
- 02
Design & itemised quote
Our architects and engineers draw the scheme, and from that we provide a transparent, itemised quotation for your approval.
- 03
Planning & approvals
Planning applications, building control and party wall matters handled for you.
- 04
Build, managed weekly
Our own trades, sequenced by a site manager. Progress reported every week.
- 05
Handover & aftercare
Joint snagging walk-through, documentation, and a guarantee on our workmanship.
Basement Conversions in Hampstead: your questions.
Can I convert a cellar in Hampstead?
Usually. Converting an existing cellar without changing the outside of the house does not normally need planning permission. Lightwells, listed buildings and new excavation do, and every basement needs building regulations approval.
How do you keep a converted basement dry?
With a designed waterproofing system, typically a cavity drainage membrane with a sump and pump, or tanking where appropriate. It carries a guarantee and is designed for the ground conditions found on site.
Which parts of Hampstead do you cover?
All of Hampstead and NW3, including Church Row, Fitzjohns Avenue, Redington Road, Frognal, Well Walk, Flask Walk, and the neighbouring districts. We are based in London and our teams work across central, north, north-west, west and south-west London.
Other services in Hampstead.
House Refurbishment in Hampstead
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Flat Refurbishment in Hampstead
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House Extensions in Hampstead
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Structural Alterations in Hampstead
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Loft Conversions in Hampstead
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Kitchen Renovation in Hampstead
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Bathroom Renovation in Hampstead
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Bespoke Joinery & Fitted Furniture in Hampstead
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Architectural & Interior Design in Hampstead
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Planning Permission & Building Regulations in Hampstead
Read moreBasement Conversions across London.
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We will visit, listen and explain what is possible for your property and how it would be approved. No pressure, no sales pitch.