Flat Conversions Charlton

Flat conversions in Charlton start from its houses. 51% of homes here are houses and 35% of the total are terraced, while 29% of the stock predates 1919, so the likely candidate is a larger Victorian terrace split into two or three self-contained flats. Royal Greenwich says house-to-flat conversions need planning permission, and London Plan space standards apply to every new flat. We build to the consent you hold, with fire and sound separation between the flats done so the tests pass.

In Charlton, 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 Charlton: 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 and space standards for a Charlton house split into flats

Royal Greenwich's Urban Design Guide says a house-to-flat conversion in Charlton needs planning permission, and any extension built to make it work should meet the same minimum internal space standards as new dwellings. London Plan Policy D6 sets those standards, and its table counts conversions and changes of use as new dwellings. The same standards apply to all tenures, so flats for sale and flats to rent are measured the same way.

The numbers that bite are bedrooms and ceilings. Under Policy D6 a single bedroom must be at least 7.5 square metres and 2.15m wide, a double at least 11.5 square metres, and the floor to ceiling height at least 2.5m over 75 per cent of each flat. On a Charlton terrace the rear wing and the top floor are where those figures fail, so we check them against your drawings before pricing. The owner or their designer makes the application.

Housing in Charlton

Charlton has about 9,540 homes on the Council Tax list: 29% pre-1919, 22% interwar and 49% post-war, with flats making up 49% and houses 51%. Terraced houses make up 35% of homes here, and a converted terrace in Charlton has two party walls to consider for sound.

Light, outlook and outdoor space in a Charlton conversion

Policy D6 also asks developments to maximise dual aspect homes and normally avoid single aspect ones. In a Charlton terrace that usually favours splitting by floor, so each flat has windows front and back, rather than front and rear flats on the same level. The stair becomes a shared route, and its position decides how much of each floor is left for rooms. We walk the drawings through on site before strip-out so the stair line is fixed early.

Outdoor space is the second pressure. Where the borough sets no higher standard, the London Plan asks for at least 5 square metres of private outdoor space for a 1 to 2 person flat plus 1 square metre for each additional occupant. The ground floor flat usually takes the garden, and an upper flat may need a terrace. The London Plan counts residential conversions as small-site intensification where they add homes, which frames how a Charlton scheme is judged.

Sound and fire separation between flats in a Charlton terrace

Policy H(b) Conversions requires sound insulation between the new units and between them and neighbouring dwellings, so in a Charlton terrace both the new floors and the party walls count. Approved Document E sets the performance for flats formed by a material change of use: 43 dB airborne for walls, floors and stairs, and 64 dB maximum impact for floors and stairs. Pre-completion sound testing checks it, and we build to pass rather than to hope.

That means independent ceilings or resilient bars under the old joists, mineral wool in the void, a floating layer above and every service hole sealed. Part B fire separation follows the same lines: each flat becomes its own compartment, with fire-rated floors, a protected stair and fire doors to each entrance. Where the work cuts into or builds on a party wall with the house next door, the building owner serves notice under the Party Wall Act before we start.

Building control, drains and services for new Charlton flats

A conversion is a material change of use, so building control is involved from the start. Royal Greenwich says its building control team should be advised when a building is converted, and any building over or within three metres of a public sewer needs a full plans application. In a terrace the shared drain behind the houses may be a public sewer, so the drainage survey comes before any extension or layout is fixed.

Each flat needs its own electricity supply, meter and consumer unit, its own heating, usually its own water supply and, where gas is used, a gas meter, plus an address through street naming and numbering. Inspections in Royal Greenwich must be booked at least 2 working days ahead, so we plan the stages where floors and walls close around those visits. The registered electrician's and Gas Safe engineer's certificates for each Charlton flat are collected flat by flat before completion is requested from building control.

• House to flat conversions into two or more self-contained units
• Heating and hot water for each flat, gas by a Gas Safe registered engineer
• Protected escape stairs and fire-rated flat entrance doors

VOA Council Tax stock of properties, March 2025, for Charlton Village, Charlton Slopes and Hornfair Park. Counts rounded by the VOA.

If this is your first project in Charlton, these are worth a look: structural alterations in Charlton, flat conversions across Greenwich, builders in London who take on conversions, refurbishing a flat that has already been converted, flat conversions anywhere in London and Central Heating Installation Cost.

Why Choose GS Renovation in Charlton

A conversion is judged at the end by two tests you cannot argue with: the room sizes on the drawings and the sound test on site. We read the approved plans and conditions before pricing, flag any room that looks short, sequence the work so building control sees each separating floor before it is closed, and coordinate the separate supplies for each flat. Abdelaaziz Saaid, the founder, oversees the build with over thirty years of hands-on experience behind him.

• Each flat's new electrics signed off by a registered electrician for Part P
• Mains-wired, interlinked smoke and heat alarms to the approved fire strategy
• Our own trades on site rather than a chain of subcontractors

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.