Flat Conversions Catford

Flat conversion in Catford starts from a limited pool of houses. Houses are 34% of homes here, 28% of them terraced, and they are the Edwardian terraces and period family homes that could be split. Lewisham's Policy HO2 supports turning a house into self-contained flats only where set criteria are met, including keeping a family sized unit. We build conversions to the approved drawings, with fire and sound separation, separate services and a finished kitchen and bathroom for each flat.

In Catford, 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 Catford: 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.

Lewisham's family housing test for Catford conversions

The first question on a Catford conversion is whether the house must keep a family home inside it. Under Lewisham's Policy HO2, a house to flats conversion has to re-provide a family sized unit of 3 or more bedrooms, unless the property is shown to be unsuitable for family accommodation. That shapes the layout before anything else. One way to meet it is a ground floor family flat with the garden, with the upper floors forming one or two smaller units.

Lewisham's Policy QD8 then asks housing proposals, changes of use included, to meet and where possible exceed the London Plan minimum space standards. On a narrow Catford terrace, those two tests together limit how many flats the house can yield. We price from the approved layout and flag early where a wall position or stair would squeeze a room below the size the plans rely on. A few centimetres lost to a new lining can turn a compliant double into an undersized room.

Housing in Catford

For Catford the Council Tax list gives about 7,650 homes; by type 66% flats and 34% houses, by age 33% post-war, 4% interwar and 61% older than 1919. Since most homes here are flats, a flat in Catford can be split or combined only with the freeholder's consent, and changing the number of homes usually needs planning permission as well.

Space standards that fix the rooms in a Catford flat

London Plan Policy D6 applies its minimum space standards to conversions as well as new build, so each new Catford flat has room sizes it must hit. A single bedroom must be at least 7.5 square metres and at least 2.15m wide, and a double or twin bedroom at least 11.5 square metres. Those figures are measured on the finished walls, so thick linings, boxed pipes and a new stud wall all eat into them.

Height is the harder test in a period house. Policy D6 sets a minimum floor to ceiling height of 2.5m for at least 75 per cent of each dwelling's gross internal area. Lowered ceilings for sound insulation or new services can push a Catford top floor below that line. We check the finished heights against the drawings before we set out partitions, so problems surface before partitions are built. Where a ceiling cannot come down, the acoustic layer goes on top of the floor instead.

Fire and sound separation between Catford flats

Every conversion in Catford turns a single house into stacked homes, so the floors and party walls between them have to stop fire and noise. Approved Document E sets the standard for flats formed by a material change of use at 43 dB airborne for walls and for floors and stairs, and 64 dB maximum impact for floors and stairs. Old timber floors in a period house fall well short of that on their own.

The usual build up is a new ceiling on resilient bars below, mineral wool between the joists and an acoustic layer above, with the stair enclosed to protect the escape route under Part B. Fire doors to each flat, linked alarms and fire stopping round every pipe and cable complete it. We leave the work open for inspection and pre-completion sound testing, because a failed test after decoration means taking the Catford ceilings down again.

Services, addresses and party walls in a Catford conversion

Each new Catford flat needs its own supplies, so the services plan is drawn early. That means a separate electricity meter and consumer unit per flat, its own heating and hot water, a water supply the owner can isolate, and drainage that can be cleared without entering a neighbour's home. New flats also need addresses through the council's street naming and numbering process before the utilities will set up accounts, so the owner starts that while the build is running.

Structural work on a party wall with the house next door brings the Party Wall Act into play. Lewisham Building Control says the Act is a civil matter and it is not involved in its administration, so the building owner serves the notices and appoints surveyors where needed. We give the owner's surveyor the method and programme for any beam pockets, cut back chimney breasts or new openings in the wall.

• Protected escape stairs and fire-rated flat entrance doors
• Insulation to the walls, roof and floors the conversion touches
• Decoration, flooring and making good throughout, ready to let or sell

VOA Council Tax stock of properties, March 2025, for Catford East & Mountsfield Park and Catford Bridge. Counts rounded by the VOA.

If you are weighing up flat conversions in Catford, it may help to read structural alterations in Catford, flat conversions across Lewisham, 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 Central Heating Installation Cost.

The GS Renovation Difference in Catford

A conversion is several builds in one house, and the order matters: structure and stair first, then fire and sound separation, then services for each flat, then kitchens, bathrooms and finishes. We run that sequence with our own trades, with a registered electrician certifying each flat's wiring and a registered gas engineer for any gas work. You get a written quotation after a survey, a written programme, one named point of contact, and a build that follows the approved drawings, ready for inspection and sound testing.

• Dust screens and floor protection in occupied homes
• Full plans application to building control, never a building notice
• Each flat's new electrics signed off by a registered electrician for Part P

Reviewed jobs near Catford

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

• Replace small section of wooden worktop, sink, tap and gas hob, Crofton Park, 17 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.