Flat Conversions Teddington

A flat conversion in Teddington means splitting a house into self-contained flats, or occasionally putting a converted house back together. The stock gives both jobs: 51% of homes here are houses and 49% are flats, and 40% went up before 1919, when tall terraces and villas were built for one family each. Splitting a house into flats needs planning permission, and under Policy 14 of its Local Plan Richmond weighs whether a given property suits conversion at all. We build the scheme your designer has consent for, with the fire and sound separation the new flats need.

In Teddington, 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 Teddington: 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 Teddington houses can make a case for conversion

The planning test comes before any drawing in Teddington. Policy 14 on loss of housing asks each conversion scheme to show the building is suitable, and to deal with environmental and design points, while the Local Plan warns that in some places conversion would not fit at all. The size of the house, its layout and its street therefore count as much as the number of flats you hope to get from it.

In practice the candidates are larger period houses with good ceiling heights and a stair that can serve every floor, since a narrow two-up two-down seldom yields two flats that pass the standards. Your designer or planning consultant makes the case and the application. We come in at the feasibility stage to comment on the stair, the soil stacks and the separating floors, so the Teddington scheme that gets consent is one that can be built at a sensible cost.

Housing in Teddington

On the valuation list Teddington counts about 11,670 homes, 49% flats and 51% houses; 40% predate 1919, 13% are interwar and 47% post-war. 27% of homes here are terraced; a converted terrace in Teddington has two party walls to consider for sound.

Room sizes and ceiling heights for new Teddington flats

Each flat carved out of a Teddington house is treated as a new dwelling, so it has to reach the space standards. The London Plan's table counts conversions and changes of use as new dwellings, and Richmond's plan takes up the national space standard alongside the optional higher Part M for access. For bedrooms, D6 in the London Plan sets 7.5 sq.m and a 2.15m width for a single, and 11.5 sq.m for a double or twin.

Height is where period houses can struggle. D6 wants 2.5m from floor to ceiling across no less than 75 per cent of each flat's Gross Internal Area, and the top floor of a Victorian terrace can miss that once new floor build-ups and acoustic ceilings go in. We measure finished heights against the drawing as each floor is laid, so any shortfall against the size or height the consent was granted on shows up while it can still be corrected.

Fire and sound separation inside a converted Teddington house

The hidden work in a Teddington conversion is the separation between flats. Part B of the Building Regulations makes each flat its own fire compartment, with a protected stair, fire doors and fire stopping wherever pipes and cables pass through. Part E deals with sound, and for flats made by a material change of use Approved Document E asks for 43 dB airborne through walls and floors, with impact noise through floors held to 64 dB at most.

In an old house those targets mean real build-up. Timber joists take a resilient ceiling below, mineral wool between them and a heavier floating floor on top, and walls between flats are lined on independent studs. Part L applies to renewed walls, windows and heating, and Part K to a stair that is altered. Because the sound work is tested before completion, we detail junctions around chimney breasts, stairs and service risers with care. Sound finds the weakest joint, not the middle of the floor, in an old Teddington house as anywhere else.

Services, addresses and turning Teddington flats back into a house

Every new flat in a Teddington conversion needs its own supplies. That means a separate electricity meter and consumer unit for each flat, separate heating, usually a new gas or water connection arranged with the utilities, and soil and waste routes that do not cross another flat's bedroom. The new flats also need their own postal addresses through the council's street naming and numbering service, which conveyancers and utilities ask for. Where a party wall is cut into for new beams or flues, the building owner serves notice under the Party Wall Act before that work starts.

The reverse job fits Teddington too, where 49% of homes are flats and some of them sit in period houses built for one family. Richmond will accept flats going back to one house only if the building began life as a single family home and further tests are passed, so the planning position is settled first. On site the work removes the second kitchen and the lobby between flats, opens the stair back to the hall and brings doubled soil stacks and meters down to one set of services.

• Separating walls built and lined for sound between flats
• A kitchen and shower room fitted in every new flat
• Insulation to the walls, roof and floors the conversion touches

VOA Council Tax stock of properties, March 2025, for Teddington North, Teddington Central and Hampton Wick & Teddington East. Counts rounded by the VOA.

If you are weighing up options for your Teddington property, it is worth reading structural alterations in Teddington, flat conversions across Richmond upon Thames, a building contractor for the whole conversion, party walls in a flat conversion, how we handle flat conversions across London and Structural Engineer Report Cost.

Why Choose GS Renovation in Teddington

A conversion creates new homes in law, so the paperwork at the end matters as much as the finish. We work from the consented drawings and the building control approval, photograph fire stopping and insulation as it goes in, and book the sound tests and inspections at the right stage. Each flat is set up for its own meters and services, and you get a handover pack for your solicitor and your buyer or tenant. You get a written quote after a site visit, with the separation work shown as its own line.

• Straight advice on what is and is not worth spending money on
• Each flat numbered and supplied before the keys are handed over
• Fire strategy for the stair and each flat entrance settled before strip-out

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.