Flat Conversions Kew

Flat conversion work in Kew is likely to start from the larger Victorian houses, and splitting a house into self-contained flats always needs planning permission. Richmond's Local Plan says only certain types of property suit conversion and some areas would be incompatible with it, and it adopts the Nationally Described Space Standard for the new homes. We build conversions to the consent the owner holds: separating floors, fire protection, new kitchens and bathrooms, and separate services for each flat. Kew can also have the reverse job, a converted house returned to one home.

In Kew, 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 Kew: 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 Kew houses Richmond treats as suitable for conversion

Richmond Local Plan Policy 14 on loss of housing asks conversion proposals to assess the suitability of the property along with environmental and design considerations, and the plan says only certain types of property are suitable. In Kew, with houses at 57% of homes, the likely candidates are the larger Victorian houses with enough floor area and height for two good flats, not a small two up two down terrace.

The London Plan counts residential conversions among the small forms of intensification that add homes, where they result in net additional housing. Locally, Richmond's Local Plan also presumes in favour of refurbishing and reusing existing buildings under Policy 2, which fits a conversion that keeps the old house standing. Neither policy makes a conversion automatic in Kew. The owner's designer tests the house against the plan, and we price the build once the layout has a realistic chance of approval.

Housing in Kew

Kew's housing, as the Council Tax list records it, is about 4,470 homes: 57% houses, 43% flats, with 62% pre-1919, 6% interwar and 31% built since 1945. Terraced houses make up 31% of homes here, and a converted terrace in Kew has two party walls to consider for sound.

Space standards for new flats in a Kew house

Richmond has adopted the Nationally Described Space Standard, and the London Plan applies minimum space standards to conversions and change of use as well as new build. Under Policy D6 a single bedroom must be at least 7.5 square metres and 2.15m wide, and a double or twin bedroom at least 11.5 square metres. In the front rooms of a Kew Victorian house those sizes are usually met; in the back addition and at the top of the house they can be hard to reach.

Height and outlook matter as much as floor area. Policy D6 sets a floor to ceiling height of at least 2.5m over 75 per cent of each flat, which can rule out some Kew attics and lower ground floors before design starts. It also asks for dual aspect flats where possible. The space standard sits in the planning system, not the building regulations, so it is fixed at the planning stage. We check partitions against the approved drawings as they go up.

Fire, sound and services between flats in a Kew conversion

The floor between two flats in a Kew conversion has to separate fire and sound under Parts B and E, and a Victorian joisted floor rarely meets either as found. Approved Document E sets the standard for flats formed by a material change of use at 43 dB airborne for walls, floors and stairs and 64 dB maximum impact for floors and stairs. We add resilient layers, insulation and a new ceiling below, and fire stop every service route.

Pre-completion sound testing proves the separating floors and walls before the flats are signed off, so we build them to a tested detail and leave access for the tester, which limits remedial work if a reading falls short. Each flat also needs its own services: a separate electricity meter and consumer unit, its own heating, water supply and, where possible, its own gas meter, arranged with the utilities early. The owner applies to Richmond for street naming and numbering, and where a party wall with the next Kew house is cut into, the building owner serves the party wall notices and the work waits for written consent or an award.

Turning converted Kew flats back into one house

Going the other way is also possible. Richmond only accepts turning converted flats back into a single house where it was originally built as a single family dwelling and other tests are met. Merging flats loses homes, so planning is settled first. In Kew, where 62% of homes predate 1919, the candidate is a Victorian house split into flats at some point, which may still have its original stair, cornices and fireplaces behind later partitions.

When a buyer brings a split Kew house back together, we take out the second kitchen, the stair enclosure and the separating partitions, reconnect services and restore period joinery. Floors are levelled where the old partitions stood, redundant meters are removed by the utilities, and the house is left with one heating system and one consumer unit. The fire separation built for the flats can come out once building control agrees, which opens the stair back to the hall.

• Decoration, flooring and making good throughout, ready to let or sell
• Protected escape stairs and fire-rated flat entrance doors
• Bin stores, cycle stores and external works to the planning conditions

VOA Council Tax stock of properties, March 2025, for Kew Gardens. Counts rounded by the VOA.

People planning flat conversions in Kew may also want structural alterations in Kew, flat conversions across Richmond upon Thames, building control sign-off for a conversion, the Party Wall Act when a conversion cuts a shared wall, our London flat conversions page and Renovation Budget & Contingency.

Why Choose GS Renovation in Kew

Conversions fail inspections at the details: a gap in fire stopping, a floor that misses the sound test, a room a few centimetres short. We build from the approved drawings, check room sizes as the partitions go up, keep the separating floors and fire stopping open for inspection, and arrange sound testing at the end. A registered electrician certifies each flat's circuits. One point of contact runs the sequence, and the quote is fixed after a site visit to the house.

• Every flat checked against the space standard before the layout is priced
• Materials priced at options, so you choose the finish
• Separate meters, supplies and consumer units arranged for every flat

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.