Open-Plan Conversions Orpington
Open-plan kitchen, diner and living conversions in Orpington, 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 Orpington, turning the compartmented rooms of 1930s and post-war homes into flowing kitchen-diners and broken-plan living areas. We combine engineer-designed steelwork with knock-throughs, wide openings and Crittall-style dividers.
In Orpington, 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 Orpington: 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 Orpington 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.
Open-plan living in Orpington's 1930s and post-war homes
The 1930s houses around Orpington were designed with separate front and rear reception rooms and a boxed-off kitchen, which no longer suits how families want to live. Opening these up almost always means removing a load-bearing wall, so we start with a structural engineer, who sizes the steel beam that will carry the first floor once the dividing wall between the two rooms is gone.
Because these homes sit on generous plots, many owners go further and bring a rear or side extension into the same open scheme, or choose a broken-plan layout using a Crittall-style glazed divider to keep the kitchen slightly separate. Whatever the layout, the loads must land on properly sized beams and padstones, which is where the engineer's calculations and our steelwork come together.
Housing in Orpington
Of the 10,530 homes the valuation list records in Orpington, 6% were built before 1919, 39% between the wars and 55% since 1945; 17% are flats and 83% are houses. A semi in Orpington usually opens up with one beam, one end on the shared wall, and 33% of homes here are semi-detached.
Opening up an Orpington ground floor without losing the escape route
Knocking the hall, front room and back room of an Orpington semi into one space changes more than the structure. In a two storey house the ground floor rooms normally open onto a hall that leads to the front door, and removing the hall wall takes that separation away. Building control will look at how people get out in a fire, particularly from the bedrooms, and the answer can involve escape windows, a door kept at the foot of the stair or mains-linked smoke alarms. Bromley inspects building notice work on site but does not approve the plans that accompany it, so on this job the question otherwise surfaces at inspection.
That is why, for an open-plan scheme that removes the hall wall, we lean toward a full plans application. Bromley aims to issue the approval notice within five weeks, or two months if both sides agree to extend, and the fire arrangement is then settled on paper before the steel is ordered. Where only the wall between the front and back rooms goes and the hall stays, a building notice deposited at least two days before work starts is usually enough. The question comes up often here: 39% of Orpington homes were built between 1919 and 1939, when a separate entrance hall was the norm.
Knock-throughs done properly in BR6
A knock-through in an Orpington semi is notifiable under the Building Regulations, so Bromley Council's building control inspects the beam, bearings and padstones before they are hidden. This is not planning permission, which you do not need for internal open-plan work unless your home is listed, when listed building consent is needed as well.
Where the new beam bears into the wall shared with the adjoining semi, the Party Wall Act applies and you serve notice first, as building owner, using the drawings we supply. On site we prop the floor above, remove the wall in stages, lift the steel onto its padstones and fireline-case it, then finish the kitchen-diner or broken-plan room so the join is unbroken. One team runs the whole conversion from engineer's survey to final sign-off.
- Broken-plan layouts and Crittall-style glazed dividers
- Open-plan kitchen-diner conversions
- Heat loss and acoustic considerations before the wall comes out
VOA Council Tax stock of properties, March 2025, for Orpington West, Orpington East and Orpington South. Counts rounded by the VOA.
Trusted Open-Plan Conversions in Orpington
For an open-plan conversion in Orpington, GS Renovation gives you one accountable team from survey to finish: the structural engineer we appoint for the beam calculations, a programme planned around any party wall notice on a shared semi wall, Bromley building control sign-off, and skilled steelwork, knock-throughs and Crittall dividers. With our founder's 30+ years on the tools, we work tidily in occupied homes and hand over a certified, unbroken result.
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…
George was very friendly and helpful from start to finish. He worked really hard to ensure our kitchen was installed to a high standard and was…
FAQ
Frequently Asked Questions about Open-Plan Conversions Orpington
How much should open-plan conversion in Orpington cost?
In Orpington, open-plan conversion will usually fall within £3,000 to £8,000 or more (indicative), yet two homes of the same size can still land far apart. Sequence explains most of the gap: the heating is resized before the space is decorated, and a quotation that skips a step is only cheaper on paper. GS Renovation prices each step as its own line for your BR6 property.
Can I make my 1930s Orpington semi open-plan, and what's involved structurally?
Yes. It almost always means removing the load-bearing wall between the two reception rooms, so a structural engineer sizes a steel beam to carry the first floor onto padstones. Bromley building control signs off the work under the Building Regulations, and where the beam bears into the wall shared with next door the Party Wall Act applies and you serve the notice. We appoint the engineer, install the steel and make good as one job.
Can I combine an open-plan knock-through with a rear extension in Orpington?
Yes, and many owners do. The internal wall and the old rear wall usually each need a beam, and where they meet, a steel post on its own pad foundation is often needed. The engineer designs the whole frame together so the loads work. The extension is built first and made weathertight, then both walls come out, with inspections at each stage.
Can I keep the chimney breast as a divider in my open-plan Orpington room?
Often, yes. If the breast sits on the wall you are removing, it can be left standing as a feature or to zone the room, with beams either side bearing onto it. The engineer checks the breast can take the extra load. It is a useful way to keep some separation between kitchen and living areas without losing the openness.
Is opening up a post-war Orpington house easier than a 1930s one?
Sometimes. Houses built from the 1960s onwards often have trussed rafter roofs spanning between the outside walls, so the upstairs partitions frequently carry no roof load at all. The ground-floor wall may then support only the first floor, which can mean a lighter beam, though the engineer still checks what sits above. With 55% of Orpington homes built since 1945, this is worth knowing before you get quotes.
How do I heat a large open-plan room in my Orpington house?
Recalculate the heating for the new shape rather than keeping the old radiators. Two rooms joined, often with wide glazed doors onto the garden, lose heat differently from the separate spaces they replace. Underfloor heating suits big rooms, heats evenly and frees wall space, and it is easiest to lay while the floor is up for the structural work. If radiators stay, their output is resized.
Can the stair stay open to the living room in an Orpington open-plan layout?
Sometimes, and it is settled with building control before the wall comes out. In a two storey house an open stair can be accepted where the bedrooms have windows large enough to escape through and the smoke alarms are linked. Where a room has been added in the roof, the requirements tighten and an open stair needs further measures. Bromley inspects the arrangement on site whichever route is used, so the fire design has to be built as drawn.
Should the knock-through and a rear extension go on one Bromley application?
Usually one is simpler. Bromley lists full plans as suitable for extensions other than small single storey domestic ones, and the internal steel can sit in the same set of drawings. One application gives one acknowledgement letter with one list of stages, and one completion inspection at the end instead of two. Split them, and each needs its own Notice of Completion before its certificate can be issued.
Can a post-war Orpington flat be made open plan?
Often, though the lease comes first. 17% of Orpington homes are flats, and in a flat the wall between kitchen and living room may carry the floor of the flat above or may be a partition. The freeholder is likely to want the structural engineer's calculations before granting a licence to alter. In a flat, the kitchen's position relative to the front door also affects the fire escape route, so check that before the layout is drawn.
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