Flat Conversions Havering

Converting a house into flats in Havering needs planning permission, and it starts with a size test. Havering Local Plan Policy 9 only supports subdividing a house with at least 120 sq m of original floor space that provides at least one family unit of 3 or more bedrooms. With 74% of Havering homes being houses, the stock is there, but the test rules out any house below that size. We build the approved scheme: fire separation, sound insulation, separate services and each flat's kitchen and bathroom.

In Havering, 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 Havering: 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 Havering houses can be split into flats

Only larger Havering houses clear the policy threshold. Havering will not support subdividing small houses below 120 sq m of floor space into two smaller units. Every conversion or subdivision must provide at least one 3b4p family unit of at least 74 sq m and a 1b1p or 1b2p flat. So a scheme that fits the policy pairs a family flat with a small flat, rather than two equal halves or a stack of studios.

Floor space is measured on the original house, so check the figure early with a measured survey. With 36% of Havering homes semi-detached or detached and 29% terraced, the candidates tend to be the bigger semis and detached houses rather than a two up two down terrace. Havering Policy 9 prefers the new family unit on the ground floor with direct access to private, usable amenity space, which usually means the garden goes with the lower flat.

Housing in Havering

Havering counts roughly 108,680 homes for Council Tax; 5% are older than 1919, 36% interwar and 59% post-war, with 26% flats and 74% houses. 29% of homes here are semi-detached; the side of a semi in Havering is where a separate entrance for the upper flat is most often placed.

Room sizes and ceiling heights for Havering flats

Each new Havering flat has to meet the national room and flat sizes. Havering Local Plan Policy 7 supports residential developments that meet the National Space Standards and the London Plan floor to ceiling height requirement. London Plan Policy D6 sets a minimum floor to ceiling height of 2.5m for at least 75 per cent of the Gross Internal Area of each dwelling. That can be tight under the eaves or where a new floor is built up for acoustic layers.

Bedroom sizes are fixed too. Under London Plan Policy D6, a one-bedspace single bedroom must be at least 2.15m wide and cover at least 7.5 sq.m. A two-bedspace double or twin bedroom must have a floor area of at least 11.5 sq.m. Wardrobes, boxed pipes and a stair bulkhead all eat into those figures. We set out partitions to the drawn dimensions and check them on site before plasterboard goes up, because a room that finishes short can fail the scheme.

Fire separation and sound testing between Havering flats

Turning one Havering house into two or more flats is a material change of use, so building regulations apply to the whole building, not only to the new walls. Under Part B the upper flat needs a protected escape route, usually its own enclosed stair and entrance, and the floor between the flats becomes a fire resisting compartment floor. Existing lath or board ceilings can fall short, so a new fire rated ceiling often goes in below the floor joists. Part L applies to renewed elements and new heating, and Part M or K to new stairs and entrances.

Sound is tested, not assumed. Approved Document E sets 43 dB airborne for walls and for floors and stairs, and 64 dB maximum impact for floors and stairs, in flats formed by material change of use. We build separating floors with resilient bars, acoustic insulation and a second ceiling layer, and seal every service penetration. The pre-completion sound test is booked before decoration, because a failed test in a Havering conversion is cheaper to fix before the finishes go on.

Separate services, party walls and CIL on a Havering conversion

Each Havering flat needs its own meters, consumer unit, heating and water supply, and its own postal address. The owner asks the council's street naming and numbering team for the new addresses, and the utility companies will not fit separate meters until those exist, so that request goes in early. We run new supplies through ducts or boxed risers, keep drainage stacks within the fire separation and label every isolation point for the future owners.

Work on a shared wall brings in the neighbours. Havering's building control pages state that party wall works are a civil matter under the Party Wall Act 1996 and the council has no enforcement power, so the building owner serves the notices and any award is settled privately. New floorspace can bring a levy too: the Havering Community Infrastructure Levy was adopted in July 2019, and the owner's planning adviser checks whether the scheme, and any extension in it, is liable.

• Decoration, flooring and making good throughout, ready to let or sell
• New soil stacks, wastes and bathrooms stacked floor over floor
• Separating floors with independent ceilings and acoustic insulation

VOA Council Tax stock of properties, March 2025, for all 30 statistical areas in Havering. Counts rounded by the VOA.

For the wider picture around flat conversions in Havering, see structural alterations in Havering, our Havering area guide, a building contractor for the whole conversion, refurbishing a flat that has already been converted, how we handle flat conversions across London and Who Pays the Party Wall Surveyor.

The GS Renovation Difference in Havering

A conversion is a long sequence of hidden work, and we manage it in order: strip out, structural alterations, new floors and walls built for fire separation and sound, drainage and separate services for each flat, then kitchens, bathrooms and finishes. The structural engineer we appoint designs any new openings or floor strengthening, and building control inspects each stage. The owner or their agent obtains planning; we build to the approved drawings, give you the programme before we start and hand over the sound test results and certificates at the end.

• Full plans application to building control, never a building notice
• Site left safe and secure at the end of every day
• 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.