Flat Conversions Woolwich

Flat conversion work in Woolwich starts from a small pool of houses: 74% of homes here are already flats, and 24% are terraced houses, among them the Victorian terraces. That makes each convertible house a considered project. Royal Greenwich requires planning permission to turn a house into flats, and each new flat is measured against the same space standards as a new build. We build the conversion to the approved drawings, with fire separation, sound insulation and separate services for every flat done properly.

In Woolwich, 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 Woolwich: 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.

Planning a Woolwich house into self-contained flats

Converting a Woolwich house into flats starts with planning permission, not with the builder. Royal Greenwich's Urban Design Guide says house-to-flat conversions need permission and that any extension should meet the same minimum internal space standards as new dwellings. The London Plan space standards table is explicit that a new dwelling includes conversions and change of use, so each flat is measured against the same targets as new build. Your designer tests the layout against them first.

Those targets decide how many flats a Woolwich terrace can take. London Plan Policy D6 sets a one-bedspace single bedroom at a floor area of 7.5 sq.m with a width of at least 2.15m, and a double at 11.5 sq.m or more. A narrow Victorian back addition may only work as a kitchen or bathroom once those numbers are applied. We price from the approved layout, so the quote reflects the number of units the consent actually allows.

Housing in Woolwich

Woolwich has about 21,990 homes on the Council Tax list: 24% pre-1919, 2% interwar and 75% post-war, with flats making up 74% and houses 26%. Changing the number of flats in Woolwich needs the freeholder and usually planning, which matters here because most homes are flats.

Sound and fire between flats in a Woolwich conversion

Sound insulation is a planning policy test in Woolwich as well as a building regulation under Part E. Royal Greenwich's Policy H(b) Conversions requires sound insulation between the new units and between them and the neighbouring dwellings. Approved Document E sets the performance for flats formed by material change of use: 43 dB airborne for walls and for floors and stairs, and 64 dB maximum impact for floors and stairs. Both figures are tested on site, not assumed from the drawings.

On a Woolwich conversion that means new floor build-ups with resilient layers and a separate ceiling below, and independent linings to party walls where the flat meets the house next door. Part B fire separation runs through the same construction: protected escape routes, fire-rated doors to each flat and fire-stopping where pipes and cables pass between units. We sequence the separating floors early so pre-completion sound testing can happen before decoration. Any failure found then costs a lining, not a redecoration.

Ceiling heights, outdoor space and aspect in a Woolwich terrace

The London Plan asks more of a Woolwich conversion than room sizes. Policy D6 sets a minimum floor to ceiling height of 2.5m for at least 75 per cent of each dwelling's internal area, which a Victorian ground and first floor may well meet but a top floor under the roof slope may not. Lowering ceilings for new floor build-ups eats into that margin, so the acoustic floor and the ceiling height are designed together from the start.

Where the borough plan sets no higher standard, D6 asks for at least 5 sq.m of private outdoor space for a one or two person flat, plus 1 sq.m for each extra occupant. It also favours dual aspect homes over single aspect ones. In a Woolwich terrace that usually decides who gets the garden and whether an upper flat can have a small terrace. GOV.UK notes the national space standard sits in the planning system, not building regulations.

Services, addresses, party walls and the reverse in Woolwich

Each new flat in a Woolwich conversion needs its own supplies. That means separate electricity meters and consumer units, individual heating, a water supply that can be isolated per flat, and new addresses through the council's street naming and numbering process before the utilities will set up accounts. We plan meter positions and service risers at the design stage, since they decide where the protected stair and cupboards go. A registered electrician certifies each flat's installation separately.

An owner can also go the other way and turn two flats back into one house. A Victorian terrace was built for one household, so the original plan is still there to reuse. Because it loses a home, the owner confirms the planning position first. The work means removing the extra kitchen, having the suppliers take out the spare meters and reopening the original stair. Where the work cuts into or builds on a party wall, the building owner serves notice under the Party Wall Act, and that work starts on written consent or an award.

• Insulation to the walls, roof and floors the conversion touches
• Fire stopping round every pipe and cable through a separating floor
• Decoration, flooring and making good throughout, ready to let or sell

VOA Council Tax stock of properties, March 2025, for all 6 statistical areas in Woolwich. Counts rounded by the VOA.

Once the flat conversions work in Woolwich is scoped, people usually go on to read structural alterations in Woolwich, flat conversions across Greenwich, a building contractor for the whole conversion, the Party Wall Act when a conversion cuts a shared wall, how we handle flat conversions across London and Adding Value to a London Flat.

Trusted Flat Conversions in Woolwich

A conversion has more inspections than most building jobs: sound tests, fire separation checks and separate services for each flat, and every one of them can hold up the next trade. We plan the separating floors, walls and service risers first, book the tests at the right stage, and keep the drawings, certificates and test results in one file for building control and for the sale or letting of each flat. You get a written quotation after a survey, priced flat by flat, from the layout your planning consent allows.

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

Reviewed jobs near Woolwich

1 MyBuilder review from Woolwich, with each customer's own job title:

• Replace kitchen extractor hob, Woolwich, 27 Apr 2024 (5 out of 5)

Read all 31 on our reviews page.

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.