Flat Conversions New Malden

Flat conversions in New Malden start from a housing stock where 69% of homes are houses, 27% of all homes are terraced and 33% were built before 1919. Kingston's Core Strategy resists the loss of family-sized homes, and its Residential Design SPD applies the London Plan minimum space standards to every conversion. So a scheme to split a house into self-contained flats is judged on whether a family home is kept in the mix and whether each flat meets those sizes. We build the approved scheme.

In New Malden, 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 New Malden: 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.

Kingston's family housing policy and New Malden conversions

Kingston's Core Strategy Policy DM 14 resists the loss of existing homes of all types, particularly dwellings suitable for family accommodation. For a New Malden house that is the first question in any conversion: splitting a three bedroom semi into two small flats removes a family home, and the planning case has to deal with that directly. Planning permission is always needed to turn a house into flats, and the owner's designer prepares the application.

Policy DM 13 expects new residential development to provide at least 30% of dwellings as 3 or more bedroom units. A layout that keeps a family maisonette with the garden on the ground and first floors, and forms a smaller flat above, can answer both policies more directly than two equal flats. The London Plan also counts residential conversions as small-site intensification where they add homes, which is the other side of the argument. We price each layout so you can compare them before the application goes in.

Housing in New Malden

The stock in New Malden runs to roughly 7,070 dwellings, 31% of them flats and 69% houses, built 33% before 1919, 33% between 1919 and 1939 and 34% after 1945. The side of a semi in New Malden is where a separate entrance for the upper flat is most often placed, and 31% of homes here are semi-detached.

Space standards every New Malden flat has to meet

Kingston's Residential Design SPD says all new residential development, including conversions and changes of use, should meet the London Plan minimum space standards. Under Policy D6 a single bedroom must be at least 2.15m wide with a floor area of 7.5 square metres or more, and a double or twin needs 11.5 square metres or more. In a New Malden house those sizes decide how many bedrooms each floor can honestly hold, and a room that misses by a small margin cannot be counted as a bedroom on the plans.

Policy D6 also sets a floor to ceiling height of at least 2.5m across 75 per cent of each flat. Older upper floors and rooms under a pitched roof can fall short, and too many low rooms pushes a flat below the 75 per cent share. The SPD then asks for private amenity space of 10sqm per flat plus 1sqm per extra occupant, and communal amenity space on top. On a house plot that means dividing the garden, and an upper flat may need a terrace designed into the scheme.

Fire and sound separation between New Malden flats

Splitting a New Malden house into flats is a material change of use under the Building Regulations, so the building must meet the requirements the regulations list for that change, including Part B (fire) and Part E (sound). Part L applies to thermal elements that are renewed, and Part M to any new access. Each flat needs fire-resisting floors and walls around it, a protected route out and fire doors onto the common stair. In a Victorian house the timber floors between storeys are the weak point, and upgrading them usually means a fire-rated ceiling below and insulation in the void, to the design.

Approved Document E sets the standard for flats formed by a change of use at a minimum of 43 dB airborne for walls, floors and stairs, and a maximum of 64 dB impact for floors and stairs. Separating walls and floors are sound tested on site before completion, so we build the floor with resilient bars, acoustic insulation and a floating layer from the start. Failing a sound test late means lifting finished floors, which is an expensive step to repeat.

Services, addresses and party walls in a New Malden conversion

Each flat in a New Malden conversion needs its own supplies: a separate electricity meter and consumer unit, its own heating, and either a separate gas meter or all-electric heating. Water can be a shared main with sub-meters or separate supplies, depending on what the water company allows. New soil stacks and drainage runs are planned early, because they fix where kitchens and bathrooms can sit on each floor. The owner also applies to Kingston for street naming and numbering, so each flat has a postal address.

Kingston's boundaries page says notice must be given to the neighbour before work on a shared party wall. In a New Malden terrace or semi, cutting pockets for new floor joists or sound-rated linings on the party wall can bring the Party Wall Act into play. The building owner serves the notices, usually through a party wall surveyor, and we programme that work so it starts only once the notice period and any award are settled.

• Heating and hot water for each flat, gas by a Gas Safe registered engineer
• Fire detection in every flat and the common hall, laid out to the fire strategy
• Fire stopping round every pipe and cable through a separating floor

VOA Council Tax stock of properties, March 2025, for New Malden East and New Malden West. Counts rounded by the VOA.

Once you know the scope of the flat conversions in New Malden, it helps to read structural alterations in New Malden, flat conversions across Kingston upon Thames, a building contractor for the whole conversion, refurbishing a flat that has already been converted, flat conversions anywhere in London and Adding Value to a London Flat.

Trusted Flat Conversions in New Malden

A conversion is mostly work nobody sees afterwards: fire separation, acoustic floors, split services and new drainage stacks. We build it in the order that lets building control see each concealed layer before it is closed up, and we book the pre-completion sound tests so a failure can be fixed before finishes go on. You receive a written quotation after a survey and a written programme. Registered electricians and Gas Safe engineers certify their installations, and we collect every certificate for your completion pack.

• One point of contact on the phone, not a call centre
• Full plans application to building control, never a building notice
• Separating floors built to the acoustic detail the sound test checks

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.