Flat Conversions Bow

Flat conversion work in Bow is shaped by a council that protects family houses and by how few houses there are. Only 19% of homes in Bow are houses, and Tower Hamlets policy resists splitting family homes into smaller flats unless a family unit is kept. So the realistic jobs are a Victorian terrace split with a flat of three or more bedrooms retained, or two flats joined back into one house. We build to the approved scheme, with fire and sound separation between the homes.

In Bow, 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 Bow: 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.

Splitting a Bow house means keeping a family home

A family house in Bow can only be split into flats if the scheme keeps a family sized home in it. Policy D.H2 of the Tower Hamlets Local Plan only permits the conversion of family homes when a 3-plus bed unit is retained in the new development. The Local Plan also resists smaller self-contained flats unless the conversion enables the retention of a family unit. A tall terrace with a rear wing is the kind of house where that can work.

On a small two storey terrace, keeping a 3-plus bed unit may leave no room for a second flat, so measure before paying for a full design. With 18% of homes in Bow terraced houses, the candidates are few, and the older ones sit around Roman Road. Splitting a house into flats is a material change of use, so it always needs planning permission, which the owner or their designer applies for. The layout often puts the family flat across the ground floor and garden, with a smaller flat above.

Housing in Bow

Bow's housing, as the Council Tax list records it, is about 15,000 homes: 19% houses, 81% flats, with 23% pre-1919, 2% interwar and 75% built since 1945. Changing the number of flats in Bow needs the freeholder and usually planning, which matters here because most homes are flats.

Space, height and outdoor space for new flats in Bow

Every new flat in a Bow conversion has to meet the London Plan space standards, which apply to conversions and changes 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. The Nationally Described Space Standard sits in the planning system, not the building regulations. It is tested when the drawings are assessed and has to be right before the partitions are set out.

Height is where a Victorian terrace in Bow can struggle. Tower Hamlets Policy D.H3 asks for a minimum 2.5 metre floor to ceiling height, and the London Plan applies that height to at least 75 per cent of each dwelling's internal area. Policy D.H3 also asks for at least five square metres of private outdoor space for a 1 to 2 person flat, plus one square metre for each additional occupant, which usually means a garden split or a terrace for the upper flat.

Fire and sound separation between Bow flats

When a Bow house becomes two or more homes, each floor between them has to stop fire and sound. For flats formed by a material change of use, Approved Document E sets at least 43 dB airborne sound insulation for walls, floors and stairs, and at most 64 dB impact sound for floors and stairs. In a Victorian house with timber joists that usually means independent ceilings, acoustic insulation between the joists and a resilient floor layer, finished before the pre-completion sound test.

Fire separation follows the same floors and walls. Under Part B each flat in the Bow house needs a protected escape route, fire resisting doors onto the common stair and its own interlinked smoke alarms, and every service passing between flats needs fire stopping where it crosses the separating floor. We build to the building control approval and leave inspection points open until they are checked, with a commencement notice sent at least two working days before work starts.

Services, addresses, CIL and neighbours in a Bow conversion

Two flats in a Bow house need two of everything a household depends on. That means separate electricity and gas meters, a water supply or submeter for each flat, separate heating, and a consumer unit in each flat certified by a registered electrician. Each new flat also needs its own address through the council's street naming and numbering process, which the utilities and the Land Registry will ask for before accounts can open.

A development in Tower Hamlets is potentially liable for CIL if it creates one or more new dwellings, so the owner should check the position with the planning consent before starting work in Bow. Where the conversion cuts into a party wall for new beam bearings or flues, the Party Wall Act applies and the building owner serves the notices. We schedule that work after the notice period, so the neighbours next door are not surprised.

• Insulation to the walls, roof and floors the conversion touches
• Separating walls built and lined for sound between flats
• House to flat conversions into two or more self-contained units

VOA Council Tax stock of properties, March 2025, for Bow North & Fish Island, Bow West and Bow South. Counts rounded by the VOA.

Work in Bow rarely sits on its own, so you may also want structural alterations in Bow, flat conversions across Tower Hamlets, a building contractor for the whole conversion, the Party Wall Act when a conversion cuts a shared wall, our London flat conversions page and House Rewire Cost.

Why Choose GS Renovation in Bow

Conversions fail on detail: a bedroom a little under size, a floor that does not pass the sound test, a missing fire door closer. We build the scheme your designer has had approved, set out rooms against the dimensions on the drawings, and sequence the separating floors so they are tested before finishes go on. You or your agent hold the planning consent, and we give you the programme and the certificates building control and the utilities ask for. One site lead runs the job from strip out to the final inspection.

• Founder with 30+ years of hands-on experience
• Each flat numbered and supplied before the keys are handed over
• Full plans application to building control, never a building notice

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.