Open-Plan Conversions Kensington and Chelsea
Open-plan kitchen, diner and living conversions in Kensington and Chelsea, 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 across Kensington and Chelsea, opening up the compartmented interiors of stucco-fronted townhouses and red-brick period homes near Holland Park and the museums of South Kensington. We turn narrow period room layouts into light-filled kitchen-diners and broken-plan living space, every beam designed by the engineer and signed off by building control.
In Kensington and Chelsea, 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 Kensington and Chelsea: 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 Kensington and Chelsea 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 conversions for Kensington's period layouts
The borough's Georgian, Regency and Victorian townhouses were designed as sequences of separate rooms, so opening them up means removing masonry spine walls that carry real structural load. A simple knock-through between two reception rooms, a full kitchen-diner across the lower ground floor, or a broken-plan scheme with a Crittall divider all start the same way: a structural engineer assesses the wall and sizes the steel beam that replaces it. Nothing is knocked through on assumption.
We prop the structure, take the wall down in staged sections, and seat the new RSJ onto engineered padstones so the loads pass safely into the retained masonry. In many of the borough's homes a broken-plan approach, with a steel-framed Crittall screen holding a sense of separation, suits the tall proportions and period detailing better than a single unbroken space. We work around original cornicing, fireplaces and joinery wherever the design allows.
Housing in Kensington and Chelsea
Around 89,280 homes make up Kensington and Chelsea on the valuation list; 84% are flats and 16% houses, and 65% date from before 1919, 8% from between the wars and 26% from after 1945. Opening up a flat in Kensington and Chelsea changes its fire escape route, which building control checks, which matters here because most homes are flats.
Opening into an infilled closet wing in Kensington and Chelsea
In Kensington and Chelsea an open-plan scheme can start at the back of the lower ground floor. The Kensington Conservation Area Appraisal notes that the void between rear closet wings has frequently been infilled at lower ground floor level with conservatory type extensions. That infill is the obvious space to join to the kitchen, but it was built as a garden room, not as part of the structure of the house. Its roof may be lightweight glazing on a timber or aluminium frame, and the old rear wall behind it has been carrying the house above all along.
Opening that wall to join the two spaces therefore needs more than a beam. The structural engineer we appoint checks what the infill roof bears on, whether an earlier opening already has a lintel or a beam of unknown size, and how the new steel will be supported where the closet wings meet it. Thermal performance changes as well: once the conservatory is part of one open room, heat loss through its glazing becomes the room's problem, and building control looks at the whole space. Asking for the infill's approval drawings from the planning register before survey can save a round of opening up.
Knock-throughs and building control in South Kensington
Removing an internal wall to open up your layout is structural work governed by the Building Regulations, and the Royal Borough of Kensington and Chelsea's building control inspects the beam, the padstone bearings and the propping before certifying it. This is not a planning matter for internal work. Only alterations to a listed property's fabric or a conservation-area frontage bring listed-building consent or planning into play, and we identify that at the design stage.
In South Kensington and Chelsea, where townhouses adjoin their neighbours, the wall being opened often meets or forms the party wall, and any beam bearing into that shared wall triggers the Party Wall Act. You serve notice on the adjoining owner before work begins. From coordinating the engineer's calculations to the steel, the making good and building control's final certificate, one GS Renovation team delivers the whole conversion under a single point of accountability.
- Making good, plastering and decorating the finished space
- Steel beam installation to remove the dividing wall
- Beam depth checked against existing ceiling heights
VOA Council Tax stock of properties, March 2025, for all 21 statistical areas in Kensington and Chelsea. Counts rounded by the VOA.
Why Choose GS Renovation in Kensington and Chelsea
Homeowners across Kensington and Chelsea choose GS Renovation for open-plan conversions because we combine design sensitivity with structural rigour. You get an engineer-designed beam and building control handled by one accountable team, careful staged working that protects period detail, and a dust-managed result signed off by building control, all 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 Kensington and Chelsea
Which parts of an open-plan conversion project in Kensington and Chelsea cost the most?
On an open-plan conversion project in Kensington and Chelsea the approvals are a small line and the time on site the large one, within £3,000 to £8,000 or more (indicative). The cost of the engineer's calculations and building regulations approval of the steel is small next to labour, but skipping it costs a sale. The days on site are set by the property itself: the protected route from the stairs decides how open the plan can be.
Can I open up my South Kensington reception rooms without planning permission?
For internal work, yes. Knocking two rooms into one is structural work under the Building Regulations, so the Royal Borough's building control signs it off rather than planning. Planning or listed-building consent only applies if your home is listed or the change affects a conservation-area exterior. We arrange the engineer's beam design and the building control application for you.
Can I open up my Kensington and Chelsea flat without affecting the fire escape?
Rarely without some changes. In most flats, a protected hallway links the bedrooms to the front door. Opening the kitchen or living room onto that hallway breaks that protection, so building control will require a fire strategy. With 84% of homes in the borough being flats, this is the first thing to settle. The lease will also need freeholder consent for structural work.
Does opening up a Kensington and Chelsea townhouse affect escape from upper floors?
Yes, in a house of three or more storeys. The stair is the escape route for everyone on the upper floors and must stay protected down to the exit. Opening the ground-floor hall into a reception breaks that route, so building control needs a fire strategy before approval. In the tall stucco-fronted townhouses of SW7 and SW3 this, rather than the steel, is often what shapes the design.
What alternatives to full open plan suit a Kensington and Chelsea mansion flat?
A broken-plan layout often suits better. Many mansion flats are laid out along a corridor with rooms off it, so removing every wall is structurally heavy and puts the kitchen on the escape route. Widening the doorway between two reception rooms, fitting glazed doors or a screen, or opening the kitchen partially into the dining room keeps some separation while sharing the light.
Can the double doors between my Kensington and Chelsea reception rooms be widened?
Usually, yes. Period houses around Holland Park and South Kensington often already have a wide opening between front and back reception rooms, fitted with folding or pocket doors. Widening it further means a new beam sized by the engineer over the enlarged span. The existing ceiling line and cornice can often be kept by setting the steel flush within the floor depth, where the joists allow.
Does joining a conservatory to the kitchen change its building regulations status?
Yes. A conservatory kept separate from the house by external quality walls, doors or windows sits outside much of the energy regulations. Take that separation away to form one open room and the conservatory becomes part of the heated house, so building control assesses the glazing, the roof and the heating across the whole space. In Kensington and Chelsea, where the Kensington Conservation Area Appraisal notes closet wing voids frequently infilled with conservatory type extensions, this is a question to settle at survey.
Which conservation area appraisal applies to an open-plan scheme in Kensington?
The one for your street, which may cover more ground than expected. Separate conservation areas designated in the 1970s were extended and joined together in 1976 to form the Kensington Conservation Area. An appraisal is not written about internal knock-throughs, although listing covers the interior of a listed house. The new rear doors, rooflights or infill roof that can come with an open-plan scheme are external, and they are the part the appraisal speaks to, including its note on infilled closet wings.
What happens to floor levels when a room opens into a closet wing infill?
They often do not line up. An infill added later was set out on its own slab, a step or two above or below the floor of the house, and the damp-proofing of the two may never have been designed to meet. In Kensington and Chelsea, with closet wing voids frequently infilled at lower ground floor level according to the Kensington Conservation Area Appraisal, levels are surveyed first. The choice is then a deliberate step at the beam line or a new floor across both.
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