Open-Plan Conversions New Malden
Open-plan kitchen, diner and living conversions in New Malden, 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 and broken-plan spaces in New Malden's interwar homes, turning boxy 1930s layouts into flowing kitchen-diners and knock-throughs. Working across KT3 and out towards Surbiton, backed by our founder's 30+ years on the tools, we combine the structural engineering these houses need with the finish that makes a family space genuinely work day to day.
In New Malden, 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 New Malden: 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 New Malden 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 Kingston Council 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 New Malden's interwar houses
The 1930s semis around New Malden were built as a series of separate rooms: a front reception, a rear dining room and a compartmentalised kitchen at the back. In these houses there is real scope to knock the rear reception into the kitchen for a big kitchen-diner, or to open the two front-to-back rooms into one light-filled space that runs the length of the ground floor.
The catch is that the dividing wall is very often load-bearing, so a knock-through is a structural project, not just a bit of demolition. A structural engineer sizes a steel beam to carry the load, the beam bears onto padstones, and we prop, demolish in stages and set the steel before removing any support. For broken-plan schemes we can frame a Crittall-style glazed divider to zone the space without closing it off.
Housing in New Malden
By the valuation list's count, New Malden holds about 7,070 homes, 69% houses and 31% flats; by age, 33% were built before 1919, 33% between the wars and 34% since 1945. 31% of homes here are semi-detached; the two ground floor rooms of a semi in New Malden usually open up with one beam, one end of it on the shared wall.
Getting a New Malden open plan approved in one pass
For an open plan layout in New Malden, one detail that can send a full plans application back is the escape route, not the steel. Kingston has up to 5 weeks to approve full plans, extended to 8 weeks if revisions or more information are needed. This applies in a flat, or in a house where the hall is being opened into the living room. Send the fire detection layout, any escape windows and the route to the front door with the first submission, drawn on the same plan as the beam. That gives the decision its best chance of landing inside the shorter window, and it stops a kitchen delivery date waiting on drawings that were sent back for an escape detail.
Where the beam lands depends on the house type. In New Malden 27% of homes are terraced houses and 40% are semi-detached or detached. Opening a terrace from front to back can put both ends of the new beam into party walls, one with each neighbour, so two adjoining owners may need notice. A semi has one party wall and one flank wall that is yours alone, and a detached house has none. Count the shared walls on the plan before the design is fixed, because every bearing moved off a party wall onto a new pier on your own side can take a neighbour's notice out of the programme.
Consents for open-plan work in KT3
An internal open-plan conversion in New Malden is controlled under the Building Regulations, not planning. You do not need planning permission to knock rooms together inside the house; Kingston Council building control inspects the propping, padstones and beam and issues the completion certificate. A listed property, uncommon among these houses, is the exception and needs listed building consent.
Since the house is semi-detached, one side wall is a party wall shared with the neighbour. Where a new open-plan beam bears into that shared wall, the Party Wall Act applies and you, as building owner, serve notice on the adjoining owner. We identify this at design stage and give you the drawings the notice needs alongside the engineering, so the knock-through, the consents and the plastered, decorated finish all come from a single team.
- Bi-fold and sliding door openings onto the garden
- Level flooring and threshold removal across the whole space
- Flush beam detailing where a downstand would look wrong
VOA Council Tax stock of properties, March 2025, for New Malden East and New Malden West. Counts rounded by the VOA.
Why Choose GS Renovation in New Malden
GS Renovation is the right choice for open-plan conversions in New Malden because we run the whole project: beams designed by the engineer we appoint and set on padstones, Kingston Council building control sign-off, and a clean, well-finished space, whether that is a full knock-through, a kitchen-diner or a Crittall broken-plan divider. Our founder's 30+ years on the tools stand behind every job.
George was brilliant. Lovely bloke, very reasonably priced and a perfectionist to boot. He completed our small kitchen renovation with care and great…
George always kept to commitments and arrived on time. He offered helpful suggestions during his initial visit and promptly provided a reasonably…
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 New Malden
Can I get a fixed price for open-plan conversion at a KT3 address?
Fixed pricing is the default for open-plan conversion in New Malden, not the exception. What prevents it is real uncertainty about the structure at the KT3 address, and then GS Renovation prices the investigation first and the job afterwards, within £3,000 to £8,000 or more (indicative). Once it is done, the build follows its set sequence: the heating is resized before the space is decorated.
Is knocking my New Malden dining room and kitchen into one an open-plan job I can just demolish?
Not quite. In these 1930s semis the wall between the rear reception and kitchen is usually load-bearing, so it needs a structural engineer to size a steel beam on padstones before anything comes down. The work is signed off by Kingston Council building control, no planning permission is required for internal changes, and if the beam bears into the shared party wall you serve notice on your neighbour.
Will a New Malden through-lounge sound echoey once the wall comes out?
Hard floors and bare walls in one long room do carry sound, especially with a television at one end and the kitchen at the other. Rugs, upholstered seating and shelving where the wall once stood soften it. Heating needs rethinking too: a front bay and rear doors in the same space often mean moving radiators, plumbed at first fix while the boards are up.
Can the ceiling in my New Malden open plan stay flat with no beam showing?
Often, if the joists run the right way. Where they land on the wall being removed, a flush beam lets them be carried within the floor depth, so the ceiling line continues unbroken. Where they run parallel to it, a downstand may be the only sensible answer. Ceilings in interwar houses are lower than in Victorian ones, so a visible downstand stands out more here.
What happens where two New Malden rooms meet at different floor levels?
It is settled before any flooring goes down. A 1930s kitchen was sometimes laid on concrete while the dining room sits on suspended timber, so the two can differ in height and in how they take underfloor heating. The fix is a small step, packing up one floor, or a screed. Air bricks serving the timber void must stay clear whichever route is chosen.
Does an open-plan conversion in a New Malden flat need fire approval?
Yes. Opening up a flat changes the escape route, because the hall stops working as a protected passage to the front door. Building control has to agree a fire strategy setting out detection and how occupants reach the exit. With 31% of New Malden homes being flats, that gate comes up regularly, and it sits alongside the freeholder's written consent under the lease.
Can an open plan layout in a New Malden house go in under a building notice?
It can. Kingston charges the same on either route, and under a building notice work can start within 48 hours of submission. The catch is that nothing is approved in advance, so if the inspector wants a different escape arrangement or a deeper beam once the wall is open, the change happens on site. For a house with a single straightforward opening that risk is small. For a flat, approved drawings first are the safer order.
Does opening up a New Malden house built after 2000 always need steel?
Not always. 9% of homes in New Malden were built in 2000 or later, and in some of them the wall between kitchen and living room is a stud partition, with the floor above spanning past it on engineered joists. That is only confirmed by opening the ceiling or reading the builder's drawings, and the structural engineer we appoint checks it. Where the wall carries nothing, the job becomes making good the ceiling, moving services and joining two floor finishes, with no beam at all.
How far can the kitchen end of a New Malden open plan grow if we also extend?
Where the extension needs planning permission, Kingston's Residential Design SPD says single storey rear extensions should generally not exceed 3-3.5m in depth. Added to an opened ground floor, that is a zone across the back rather than a separate room, so the width of the opening in the old rear wall decides how the space reads. A full width beam across a New Malden semi gives one long room. Leaving short nibs gives a defined kitchen zone and a shorter span.
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