Open-Plan Conversions South Kensington
Open-plan kitchen, diner and living conversions in South Kensington, steel, floors, heating and finishes as one job.
- Rated 4.9 from 31 reviews on MyBuilder
- London guide: £3,000 to £8,000+
- Free site survey, itemised quote
GS Renovation creates open-plan spaces in South Kensington's grand period houses, from knock-throughs between period reception rooms to garden-level kitchen-diners in the SW7 museum quarter. We open up these late Georgian and Victorian townhouses structurally while respecting the proportions, cornicing and character that make them special.
In South Kensington, 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 South Kensington: the structural engineer we appoint designs the steel, we install it, and building control signs it off.
Price guide
| Work | Indicative London range |
|---|---|
| Open-plan conversion, steel beam and finishing | £3,000 to £8,000+ |
Indicative London ranges (MyBuilder and Checkatrade, 2026), not a quotation. Prices checked September 2026. Full breakdown: Open-Plan Kitchen-Diner Ideas.
How the job runs
- Free site survey at your South Kensington address, covering the walls, services and floor levels, and an itemised quote.
- The engineer we appoint sizes the beam, and the work is registered with the Royal Borough of Kensington and Chelsea building control or an approved inspector. On a shared wall you serve the party wall notice as building owner; we supply the drawings.
- Props in, opening cut, beam on padstones; then floors, heating and electrics are joined up.
- Building control inspects the steel before it is covered. We finish the room, and the completion certificate follows.
Open-plan living in South Kensington townhouses
The classic South Kensington project is a knock-through between the front and rear reception rooms, or opening the garden-level kitchen into a single kitchen-diner. The wall between them is almost always load-bearing solid masonry, carrying the storeys above, so this is structural work: the engineer we appoint sizes a steel beam to span the new opening and specifies the padstones it bears onto at each end.
Many owners in these tall SW7 houses prefer a broken-plan feel to a fully open box, keeping some separation while gaining light and flow. We install Crittall-style glazed screens and dividers, or leave a generous supported opening with the steel neatly encased, so the period rooms still read as rooms. The result suits the scale of a period interior far better than stripping it bare.
Housing in South Kensington
The stock in South Kensington runs to roughly 8,840 dwellings, 85% of them flats and 15% houses, built 84% before 1919, 3% between 1919 and 1939 and 12% after 1945. Since most homes here are flats, opening up a flat in South Kensington changes its fire escape route, which building control checks.
Open plan in a South Kensington flat and the way out
85% of homes in South Kensington are flats, so an open plan scheme here is often one floor of a converted house or a block rather than a whole house. That changes which regulations matter. In a flat, the enclosed entrance hall is normally the protected route out in a fire. Open the living room into that hall and the kitchen can end up between the bedrooms and the front door. Building control then looks for a fire strategy under Part B, which can mean a sprinkler or mist system, a revised layout, or keeping a door the scheme had hoped to lose.
The upper floors of a converted South Kensington house add a second point, because escape from a flat several storeys up runs down a common stair that the freeholder controls. Whatever happens inside, the flat's entrance door onto that stair has to keep its fire rating and its self closer. Settle the escape design with building control before the structural engineer we appoint sizes any steel, because the position of a retained partition or a new door can move where the beam wants to be. Taking the decisions in that order avoids paying for two sets of calculations.
Beams, party walls and sign-off in SW7
Every open-plan conversion here is built around a properly engineered steel. We prop the structure temporarily, take the wall down in stages, set the beam onto its padstones, and only then remove the props, so the floors above stay fully supported throughout. In an occupied South Kensington home we protect cornicing, floors and joinery, and keep the dust and disruption contained to the working area.
Where the new opening reaches into a party wall shared with the neighbour, the Party Wall Act applies. You serve the party wall notice as building owner (or your surveyor does); we give you the drawings and programme it needs and build to any award. The beam installation is notifiable under the Building Regulations, so the Royal Borough of Kensington and Chelsea's building control inspects and certifies it; internal open-plan work needs no planning permission, though a listed building needs listed building consent. We coordinate the engineer and the inspections so you deal with one team from start to finish.
- Openings formed in stages to keep the home usable
- Zoned lighting circuits and dimming for a multi-use room
- Rooflights and glazed roofs to bring light deep into the plan
VOA Council Tax stock of properties, March 2025, for South Kensington and Queen's Gate. Counts rounded by the VOA.
Trusted Open-Plan Conversions in South Kensington
For open-plan conversions in South Kensington, GS Renovation combines structural certainty with respect for a period interior. The engineer we appoint designs the beam, and one team handles the safe propping, the steel and building control across the Royal Borough, whether you want a full knock-through, a broken-plan layout or Crittall dividers. Occupied SW7 homes are protected throughout, and every job is backed by our founder's 30+ years on the tools.
George always kept to commitments and arrived on time. He offered helpful suggestions during his initial visit and promptly provided a reasonably…
It's the second time I have hired George and he has been absolutely professional and the work he did resembles perfectly what I had in mind. Being an…
Saaid is the best craftsman I have worked with. He knows what he is doing from the very beginning. He has a great knowledge of construction…
FAQ
Frequently Asked Questions about Open-Plan Conversions South Kensington
Is a cheap open-plan conversion quote in South Kensington worth taking?
A cheap open-plan conversion quote in South Kensington is only worth taking if it covers the same work, and usually it does not. A low figure normally leaves out the approvals (the engineer's calculations and building regulations approval of the steel) or the making good, both of which still get paid for at SW7. GS Renovation itemises within £3,000 to £8,000 or more (indicative) so the comparison is honest.
Can the gap between the two rear closet wings be filled in to make one open kitchen?
It can be built, but the appraisal treats that infill as harm. Paragraph 3.133 records rear elevations with closet wings as the most widespread type in the area, built in stock brick and following a paired or single pattern across the terrace. Paragraph 3.137 states that infilling the space between them harms the regular pattern of solid and void and replaces it with a solid cliff-like appearance. Expect that to be the objection.
Will opening up the lower ground floor bring more light into the front rooms?
Yes, and the lightwell is the part to protect while doing it. The appraisal states at paragraph 3.154 that the open character of lightwells is an important feature. It adds at 3.155 that iron security bars installed within basement window reveals were not part of the original design, and can be unattractive and intrusive if not designed sympathetically. Keeping the well open, with slim glazing, does more than widening the opening.
Can the lower ground floor of a listed terrace be dug down to gain head height?
No, not under the building itself. Local Plan Policy CD11 criterion F states that a basement must not involve excavation underneath a listed building, including vaults. The listed terraces here take in Pelham Crescent, Pelham Place, Onslow Square, Thurloe Square and long runs of Queen's Gate. Where the house is listed, the honest answer is that head height comes from what is already there.
Can a flat in a mansion block be opened up the way a house can?
Not on the same terms. The Local Plan records that flats and maisonettes comprise 85 per cent of the borough's housing stock, and that buildings such as mansion blocks, often in multiple ownership, do not have the permitted development rights a dwellinghouse has. Structural work in a flat also runs through the lease, the freeholder and the other residents of the block, so two consents are being chased at once.
The scheme lowers the lower ground floor slab. What does the council want to see with the application?
A construction method statement from an appropriately qualified civil or structural engineer. Local Plan paragraph 6.113 requires it to cover ground and hydrological conditions of the site including groundwater flow, and temporary propping and other temporary works while safeguarding structural stability, with a draft construction traffic management plan submitted alongside. The Basements Supplementary Planning Document was adopted on 14 April 2016. We appoint the engineer and build to the calculations rather than producing them.
When the back rooms of a South Kensington home are opened up, can the rear windows change too?
Often, but two checks sit alongside the structure. The council has consulted on a Windows Local Development Order to remove the need for separate planning permission to change existing windows in non-listed residential properties across the borough, so check whether it has been made. Its Householders' Guide to windows states that building regulations apply to all replacement windows, so thermal performance, safety glazing and ventilation are checked either way. Widening an opening is not the same as changing a window, so that part keeps its own planning position.
Will an open plan flat in South Kensington need acoustic work for the neighbours below?
Removing walls inside the flat does not by itself bring the sound rules into play, but the floor that follows often matters more. 85% of homes in South Kensington are flats, and an open plan scheme can swap carpet for timber or stone across one large room. A lease in a converted house may require carpet or an acoustic underlay to a stated standard, so read the lease before choosing the finish. An isolating underlay and resilient fixings go down with the new floor, not after complaints.
Our South Kensington flat was built after 2000. Can its internal walls simply come out?
Sometimes more easily, but do not assume it. Only 3% of homes in South Kensington were built in 2000 or later, and a newer block can be built with concrete frames or load-bearing cross walls behind plasterboard linings. The as-built drawings from the managing agent show which walls are structural and where services run inside them. A newer block may also carry a building warranty whose terms ask for notice of structural changes, so read those alongside the lease.
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