Open-Plan Conversions Streatham

GS Renovation creates open-plan spaces in Streatham's Victorian and Edwardian terraces, opening up the two receptions, forming kitchen-diners across the rear closet wing and adding broken-plan touches with Crittall dividers. We handle the structure behind the look so the space is safe, signed off and built to last.

In Streatham, a knock-through finished as one room typically costs £3,000 to £8,000 or more, including the steel beam (indicative London ranges, MyBuilder and Checkatrade, 2026). GS Renovation Ltd, a building contractor based in Potters Bar, does the work in Streatham: the structural engineer we appoint designs the steel, we install it, and building control signs it off.

How the job runs

1. Free site survey at your Streatham address, covering the walls, services and floor levels, and an itemised quote.
2. The engineer we appoint sizes the beam, and the work is registered with Lambeth Council building control or an approved inspector. On a shared wall you serve the party wall notice as building owner; we supply the drawings.
3. Props in, opening cut, beam on padstones; then floors, heating and electrics are joined up.
4. Building control inspects the steel before it is covered. We finish the room, and the completion certificate follows.

Open-plan living in Streatham terraces

The classic Streatham conversion is the knock-through between the front bay reception and the middle room, turning two dark period rooms into one bright, connected living space. Because the wall between them is usually load-bearing, this is not a cosmetic job: it needs a structural engineer to size a steel beam, padstones at each end and careful propping while the wall comes down in stages. Get the structure right and the room feels effortless.

At the back, homeowners often knock the kitchen through into the closet wing to make a proper kitchen-diner, or add a broken-plan feel with a Crittall glazed screen that keeps light flowing while zoning cooking from dining. Crittall dividers are usually non-structural, but the openings around them frequently are, so we treat each element on its merits and the engineer designs support wherever the load demands it.

Housing in Streatham

The Council Tax list puts Streatham at about 27,640 homes, 67% flats against 33% houses; 43% went up before 1919, 27% between the wars and 29% after 1945. Where most homes are flats, opening up a flat in Streatham changes the protected route from the bedrooms to the front door, so building control checks the escape before any wall comes out.

Opening up the hall of a Streatham interwar house

27% of Streatham homes were built between 1919 and 1939, and a house of that period often puts the stair in a separate hall with doors to the front and back rooms. Taking the hall wall out is the open plan move that surprises people, because it changes the fire escape rather than just the look. Once the stair rises from inside the living room, building control looks at how the bedrooms would be escaped in a fire. The answer may be escape windows upstairs, an upgraded mains wired alarm, or a glazed screen that keeps the hall enclosed while still letting the light through.

Lambeth's building control fee guide lists a through lounge as a charged item of its own, at the same charge as a chimney breast removal. In a Streatham house, joining the front and back reception rooms and moving the hall wall are two structural decisions that can share one set of inspections if they are designed together. The structural engineer we appoint can then check whether the first floor partitions sit on the walls being removed. Upstairs walls in houses of this age are not always aligned with those below, and that is better found on paper than with the props in.

Signing off open-plan work in SW16

Opening up your home internally is a Building Regulations matter, not a planning one, so Lambeth building control signs off the structural steelwork rather than the planning office. Planning only enters the picture if the outside changes, and a listed building needs listed building consent for internal as well as external works that affect its character. We register the work, book the inspections and have the inspector check beam bearings and propping before anything is boarded over, then hand you the completion certificate.

Where the knock-through runs up to the party wall, or a beam needs to bear into the masonry shared with the neighbouring terrace, the Party Wall Act applies and you serve notice on the adjoining owner before starting. Streatham's terraces sit tight against each other, so this is common on rear kitchen-diner projects in particular. We give you the drawings the notice needs, coordinate the engineer and manage the building work, so the whole conversion runs as one coordinated job.

• Zoned lighting circuits and dimming for a multi-use room
• Rooflights and glazed roofs to bring light deep into the plan
• Flush beam detailing where a downstand would look wrong

VOA Council Tax stock of properties, March 2025, for all 7 statistical areas in Streatham. Counts rounded by the VOA.

For the wider picture around open-plan conversion in Streatham, see home renovation in Streatham, open-plan conversion across Lambeth, side return infills, converting a garage into living space, our London open-plan conversion page and Knock-Through Guide.

Why Streatham Homeowners Choose GS Renovation

For open-plan conversions in Streatham, GS Renovation gives you one team accountable for the whole project: engineer-designed steelwork, Lambeth building control sign-off and clean, careful building in your occupied home. We prop and sequence demolition safely, protect the rest of the house from dust, and bring our founder's 30+ years of experience to knock-throughs, kitchen-diners and Crittall dividers alike.

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.