Basement Conversions in Knightsbridge, SW7
Cellar and basement conversions in Knightsbridge: 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 Knightsbridge.
Where a house cannot grow outwards or upwards, it can grow downwards. Many of the older houses in Knightsbridge 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
- Knightsbridge, SW7 · SW1X
- Council
- Royal Borough of Kensington and Chelsea and City of Westminster
- Housing
- Red-brick Dutch-gabled terraces of the Cadogan estate, stucco squares around Brompton and Thurloe, mews houses and lateral apartments
- Transport
- Knightsbridge, South Kensington, Sloane Square
- Basement, existing cellar
- 10 to 16 weeks
- Consent
- Often permitted development for lofts
- Waterproofing
- Guaranteed system, designed for the site
Knightsbridge: the houses and the planning rules.
Knightsbridge is estate London at its most exacting. The Cadogan estate's red-brick Queen Anne terraces around Hans Place and Pont Street, the stucco squares of Thurloe and Brompton, and the mews behind them are all in conservation areas, much of it listed, and the estates have their own design requirements on top of the borough's.
Refurbishments here are mostly of lateral flats and mews houses, with kitchens, bathrooms and joinery specified to a very high standard and delivered around the constraints of estate consent, porters, lifts and neighbours who expect quiet. We have worked to these rules for many years, starting a mile north in Marylebone.
The Knightsbridge, Hans Town, Brompton and Thurloe Estate conservation areas cover the whole district.
Two councils
The boundary between RBKC and Westminster runs through the district; we check which authority applies at the first visit and prepare the application to its requirements.
Estate consent
The Cadogan and Wellcome estates require their own approval for alterations, with detailed guidance on windows, roofs and mews frontages.
Flats
Almost all the housing is flats, so licences to alter, block working hours and structural sign-off from the freeholder's surveyor form part of every programme.
Approvals for basement conversions in Knightsbridge.
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.
The boundary between RBKC and Westminster runs through the district; we check which authority applies at the first visit and prepare the application to its requirements.
What basement conversions in Knightsbridge 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 Knightsbridge: your questions.
Can I convert a cellar in Knightsbridge?
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 Knightsbridge do you cover?
All of Knightsbridge and SW7 · SW1X, including Hans Place, Pont Street, Cadogan Square, Thurloe Square, Brompton Road, Egerton Gardens, 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 Knightsbridge.
House Refurbishment in Knightsbridge
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Flat Refurbishment in Knightsbridge
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House Extensions in Knightsbridge
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Structural Alterations in Knightsbridge
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Loft Conversions in Knightsbridge
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Kitchen Renovation in Knightsbridge
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Bathroom Renovation in Knightsbridge
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Bespoke Joinery & Fitted Furniture in Knightsbridge
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Architectural & Interior Design in Knightsbridge
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Planning Permission & Building Regulations in Knightsbridge
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.