Open-Plan Conversions Bromley
Open-plan kitchen, diner and living conversions in Bromley, 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 Bromley, turning the compartmented rooms of 1930s and post-war semis around Beckenham, Orpington and Chislehurst into bright kitchen-diners and knock-throughs. We handle everything from full open-plan layouts to broken-plan zoning with Crittall dividers in these suburban homes.
In Bromley, 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 Bromley: 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 Bromley 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 Bromley 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.
Knock-throughs and kitchen-diners in Bromley
The classic Bromley open-plan project is joining the two reception rooms of an interwar semi, or opening the kitchen into the dining room to make a single sociable space that suits the generous rear plots common in BR6 and BR7. The wall between them is nearly always load-bearing, carrying floor joists and part of the roof, so the layout you want depends on a beam the structural engineer sizes for the full span.
We install a correctly sized steel on padstones, prop the structure temporarily while it goes in, and demolish in stages so the house stays stable throughout. Once the steel is in, we can create a wide, clean opening or a full knock-through, then finish it flush so the beam disappears into the ceiling line and the two spaces read as one.
Housing in Bromley
Around 143,450 homes make up Bromley on the valuation list; 33% are flats and 67% houses, and 17% date from before 1919, 30% from between the wars and 53% from after 1945. A semi in Bromley usually opens up with one beam, one end on the shared wall, and 24% of homes here are semi-detached.
Open-plan ground floors in Bromley houses and the escape upstairs
Houses are 67% of Bromley's homes, and in a two-storey house the stair usually rises from the hall. Open the hall into the living room and the stair now lands in the open space, so a fire in the kitchen sits on the escape route from the bedrooms. In a two-storey house the Building Regulations answer that through the upper floor: escape windows to the bedrooms and linked smoke alarms. Check the bedroom windows before the wall comes out. A small or high casement may need replacing to give a clear opening, and that joins the programme as a window order, not an afterthought.
Where the plan goes further, with the kitchen at the centre of the open room or a third storey above, the fire approach needs agreeing before demolition, and that is where the Bromley building control route matters. A building notice gets the work inspected but no plans approved, so the fire detail is judged on site. Full plans puts it on paper first, with the approval notice issued within five weeks, or two months where extended by agreement. For a three-storey house we recommend full plans, so the escape route is fixed before any wall is taken down.
Broken-plan and Crittall dividers in Bromley
Not every Bromley homeowner wants a single cavernous room. Broken-plan is popular in these interwar houses, using a part-height wall, a change in level or a Crittall-style glazed divider to zone a kitchen-diner while keeping light flowing through. Where a divider replaces a structural wall, the steel still does the structural job and the glazed screen is hung within the new opening, so the engineering and the styling work together.
This internal work is governed by the Building Regulations rather than planning, and Bromley Council's building control signs off the beam and its bearings. Where the wall being altered is the party wall shared with the adjoining semi, you, as building owner, serve Party Wall Act notice on the neighbour first. We coordinate the engineer, the drawings for your notices, steelwork and finishing as one job, from first sketch to a signed-off, decorated space.
- Openings formed in stages to keep the home usable
- 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 39 statistical areas in Bromley. Counts rounded by the VOA.
Why Choose GS Renovation in Bromley
Bromley homeowners choose GS Renovation for open-plan conversions because one team runs the whole conversion: steel sized by the engineer for the knock-through, padstones and safe staged demolition, the drawings for any party wall notice you serve on the adjoining semi, and Bromley building control sign-off, plus tidy finishing whether you want full open-plan or a broken-plan Crittall divider. It is all delivered by one accountable team with our founder's 30+ years on the tools.
George was brilliant. Lovely bloke, very reasonably priced and a perfectionist to boot. He completed our small kitchen renovation with care and great…
Giorgio is an excellent and intelligent workman, and with very reasonable prices! He installed a kitchen extractor fan in a complicated situation…
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 Bromley
Can you quote open-plan conversion for a BR1 property over the phone?
A phone quote for open-plan conversion at a BR1 property would be a figure that changes, so GS Renovation gives the range, £3,000 to £8,000 or more (indicative), and prices after a visit. What the job costs depends on what only a survey shows, because the protected route from the stairs decides how open the plan can be. Talk the scope through on 07472 424 226; the Bromley survey is free.
Can I open up the two reception rooms in my Bromley semi into one space?
Almost always, yes. In a typical Bromley interwar semi the dividing wall is load-bearing, so we have a structural engineer size a steel beam to carry the span, then prop, remove the wall in stages and bear the steel onto padstones. Bromley building control signs it off, and if the wall is shared with next door you serve party wall notice first.
Will an open-plan ground floor in my Bromley house be colder?
It can if the radiators stay where the old rooms had them. One large space loses heat through more external wall and glazing, so we recalculate the heat demand for the combined room before first fix. That can mean a larger radiator, a second one on a different wall, or underfloor heating laid before the floor finish goes down.
Why do floor levels differ when rooms are joined in a Bromley semi?
The front reception in an interwar semi often has a suspended timber floor over a void, while the back kitchen may sit on concrete poured later, and the two rarely finish at one height. Once the wall is out we level across the threshold, either by building up the lower floor or adjusting the joists, and keep airbricks clear so the void stays ventilated.
Is broken-plan a sensible option for a Bromley home?
Often, particularly where the family wants sound kept in one zone. A wide opening with a glazed Crittall screen, or a nib of retained wall, still needs the same engineered steel over it, but it keeps cooking smells and television noise contained. It also gives radiators and sockets a wall to sit on, which a fully open room can lack.
Does opening up a Bromley flat or a three-storey house change fire safety?
Yes. Once the hallway stops being a protected route to the front door, anyone upstairs or in a back bedroom has to escape through the open room. In a flat, or a three-storey house, that change needs a fire strategy agreed with building control, which may mean interlinked alarms, fire doors or an escape window before the wall comes down.
Is opening up easier in a Bromley house built after 1945?
Sometimes, but not by default. 53% of Bromley's homes were built after 1945, and a house from the later decades of that period may have a trussed rafter roof spanning between the outside walls, so the upstairs partitions carry little roof load. The ground floor spine wall can still carry the first floor joists and the partitions above them. The engineer confirms that from the loft and from under a lifted floorboard, not from the house next door.
Do Bromley conservation area rules affect an internal open-plan conversion?
The internal wall is not normally a planning matter. The catch is the light. An open-plan room is often darker in the middle, and a rooflight in the roof of a single-storey rear part is a common fix. In the Chislehurst Road Conservation Area, Bromley's Article 4 Direction removing Part 1, Class C roof alteration rights came into effect on 19 July 2022, so a rooflight there is likely to need planning permission first; check the direction for your house. Apply while the steel is being designed, so both arrive together.
Can a Bromley flat be opened up if its only exit is through the living room?
Sometimes, with the right fire detail. One in three Bromley homes is a flat (33% on the valuation list), and where the bedrooms of a flat are reached only through the living space, they become inner rooms unless something changes. The usual answers are a protected lobby by the front door, a mist or sprinkler system, or rooms arranged so bedrooms sit nearest the exit. Agree the approach on drawings before any wall is removed, and add the freeholder's licence to the timetable.
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