Flat Conversions Camberwell

Flat conversion work in Camberwell starts from a small pool of houses: 85% of homes here are already flats and only 15% are houses. Southwark's Policy P3 does not permit a home of 130sqm or less original floorspace to be split, so only larger houses qualify, which in practice points at the bigger Georgian and Victorian townhouses. We carry out conversions to the approved drawings, from the separating floors and walls to the new kitchens and bathrooms, and we also turn flats back into a single house.

In Camberwell, converting a house into two or three flats is published at £50,000 to £120,000 including professional and council fees, and an England-wide guide puts a straightforward two-flat split at £40,000 to £80,000 in construction alone, which is the part a builder prices (indicative London ranges, Architectural Drawings and Mayfair Studio, 2026). GS Renovation Ltd, a building contractor based in Potters Bar, does the work in Camberwell: we build the conversion to the approved drawings, building control inspects the fire and sound separation, and a registered electrician certifies each flat's electrics.

Which Camberwell houses are big enough to split into flats

Under Policy P3 of the Southwark Plan 2022, a house whose original net internal floor area is 130sqm or smaller cannot be split into two or more homes. The plan gives the reason plainly: the policy keeps family housing from being broken into small flats that families cannot use. In Camberwell that can rule out a smaller two storey terrace and points the work at the larger Georgian and Victorian townhouses, where several storeys and a deep plan can give room for more than one home.

So the first job on a Camberwell conversion is a measured survey of the original floor area, leaving out later extensions, attics and basements, carried out by your surveyor or designer. A house into flats always needs planning permission, because it is a material change of use, and clearing the threshold is only the first test. The owner or their designer applies. If the house does not clear it, the money is better spent on refurbishing it as one home. We price the build once the scheme has a planning route, because the separating structure depends on how the flats stack.

Housing in Camberwell

The stock in Camberwell runs to roughly 13,560 dwellings, 85% of them flats and 15% houses, built 34% before 1919, 7% between 1919 and 1939 and 56% after 1945. Since most homes here are flats, changing the number of flats in Camberwell needs the freeholder and usually planning.

Space and ceiling heights for new Camberwell flats

Southwark Plan 2022 Policy P15 requires new homes, including conversions, to meet the minimum national space standards, and a floor to ceiling height of at least 2.5 metres for at least 75 per cent of each flat's gross internal area. Under the London Plan, a single bedroom must be at least 7.5 square metres and 2.15m wide, and a double at least 11.5 square metres. Those minimums fix the room count long before finishes are chosen.

In a Camberwell townhouse the tall ground and first floors meet the height rule easily, but the top floor under the roof and any lower ground floor are where it gets tight. That decides where bedrooms can go and whether a floor is lowered. When a new floor build up is added for sound insulation, it eats into that height, so the ceiling heights are checked on site against the drawings before any joists are packed up.

Sound and fire separation between Camberwell flats

The floors and walls between new flats are where a Camberwell conversion succeeds or fails. For flats created by a material change of use, Approved Document E asks walls, floors and stairs to reach 43 dB for airborne sound, and floors and stairs to stay at or under 64 dB for impact sound. In an old house with timber floors that means a new ceiling on resilient bars, insulation in the void and often a floating floor above.

Fire separation under Part B runs alongside it. Each flat needs a protected entrance, the common stair is enclosed, and the floors between flats are upgraded to resist fire for the period building control requires. Pipes and cables that pass through those floors are fire stopped. Where possible a trial test is run on the first finished floor, and the pre-completion sound test at the end is booked into the programme so the completion certificate is not held up.

Services, addresses, neighbours and section 257 in Camberwell

Each new Camberwell flat needs its own services: a separate electricity supply and meter, its own heating, a water supply with a stopcock inside the flat, and drainage that can be reached without entering a neighbour's home. The suppliers and utilities need long notice for new meters, so the applications go in as soon as planning is granted. The new flats also need addresses, which come through Southwark's street naming and numbering process, and the utilities usually want them before they connect.

Southwark's Householder SPD notes that certain works may need a Party Wall Agreement with neighbours, separate from planning. Under the Party Wall Act, cutting into a party wall for new steel bearings, or building on it to raise fire separation, needs a party wall notice. The building owner serves the notices, and the work proceeds on the neighbour's written consent or a surveyor's award. We give the surveyors our method and sequence and protect the neighbour's side while the steels go in.

• Bin stores, cycle stores and external works to the planning conditions
• Fire stopping round every pipe and cable through a separating floor
• House to flat conversions into two or more self-contained units

VOA Council Tax stock of properties, March 2025, for Camberwell North, Camberwell Green and Camberwell South. Counts rounded by the VOA.

For the wider picture around flat conversions in Camberwell, see structural alterations in Camberwell, flat conversions across Southwark, a building contractor for the whole conversion, renovations across London, flat conversions anywhere in London and Central Heating Installation Cost.

The GS Renovation Difference in Camberwell

A conversion needs the builder to follow a set of drawings closely, because the separating floors, fire protection and room sizes are what building control inspects. We do the structural alterations to your structural engineer's design, the separation, the services split and the fit-out of each flat, and we book the sound tests into the programme. Our founder has more than thirty years of hands-on experience, and old houses are where conversions meet surprises.

• Each flat's new electrics signed off by a registered electrician for Part P
• Separating floors built to the acoustic detail the sound test checks
• Building control applications and inspections coordinated for you

Checked by Abdelaaziz Saaid, founder and director of GS Renovation Ltd (Companies House no. 14611254). Structural design is by the consulting engineer appointed to your project.