Open-Plan Conversions Dartford
Open-plan kitchen, diner and living conversions in Dartford, steel, floors, heating and finishes as one job.
- Rated 4.9 from 31 reviews on MyBuilder
- Guide from £3,000 (London-derived)
- Free site survey, itemised quote
GS Renovation opens up ground floors in Dartford houses, taking out the wall between the rooms and installing the steel that carries what it was holding. The engineer we appoint sizes the beam and specifies the bearings, and we build to that. The housing in the borough is not one thing, so neither is the job. Abdelaaziz Saaid brings over 30 years of hands-on experience.
For Dartford, on London-derived ranges a knock-through finished as one room typically costs £3,000 to £8,000 or more, including the steel beam; Kent work generally runs below that. GS Renovation Ltd, a building contractor based in Potters Bar, does the work in Dartford: the structural engineer we appoint designs the steel, we install it, and building control signs it off.
Price guide
| Work | Indicative range |
|---|---|
| Open-plan conversion, steel beam and finishing | £3,000 to £8,000+ |
Indicative London ranges (MyBuilder and Checkatrade, 2026), not a quotation. Kent work generally runs below the London figures; your price follows a site visit. Prices checked September 2026. Full breakdown: Open-Plan Kitchen-Diner Ideas.
How the job runs
- Free site survey at your Dartford 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 Dartford Borough 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.

Opening up a Swanscombe terrace starts with how much house there is
There is less of it than the borough average. The Dartford Plan to 2037 records that Swanscombe has smaller sized homes than the borough and county average, with a predominance of terraced houses and, to a lesser extent, flats. In a small terrace, removing the wall between two rooms changes the whole plan of the floor. Where the beam sits, and how far it hangs down, decides whether the result reads as one room or as two joined together.
That is a decision taken before the props go in. A downstand boarded square reads as a beam. Set flush, or picked up as a bulkhead across the full width of the room, it reads as ceiling. Steel loses strength in a fire and has to be protected, so the finished beam sits deeper than the bare section suggests. We agree that depth at the start rather than discover it at the end.
Housing in Dartford
Dartford has about 26,860 homes on the Council Tax list: 15% pre-1919, 24% interwar and 60% post-war, with flats making up 27% and houses 73%. 37% of homes here are terraced; opening up a terrace in Dartford usually lands one beam end on the party wall.
Temple Hill was built as one estate from 1947
It went up as post-war housing, constructed from 1947. A coherent estate is not a mixed era street. The party walls, the floors and the internal partitions repeat from house to house, so what one house on the estate shows tells you a good deal about what to expect behind the plaster next door. It does not remove the need to survey your own house, and we would not treat it as though it did.
We do not decide which walls are structural. The engineer we appoint inspects, establishes what the wall carries and designs the support. Where the opening reaches the wall you share with the house next door, cutting a bearing pocket into it is notifiable under the Party Wall etc. Act 1996, and serving that notice is your duty as building owner.
Opening up a house is not a conversion in the planning sense
The two words mean different things in The Dartford Plan to 2037. Conversion there means turning one existing dwelling into more than one. The plan states that conversions of existing dwellings will only be allowed where the original property is more than 120 square metres. Knocking two reception rooms into one is not that, and it stays a Building Regulations matter rather than a planning one.
The distinction matters if your plans move on later. A ground floor opened into one space, and a self contained unit created inside the same building, are two different applications. If the second is where you are heading, establish the floor area first. Indicative London ranges, MyBuilder and Checkatrade, 2026, put an open-plan conversion, including the steel beam and the finishing, at £3,000 to £8,000+.
- Knock-throughs between front and rear reception rooms
- Radiator relocation and underfloor heating in the new layout
- Rooflights and glazed roofs to bring light deep into the plan
VOA Council Tax stock of properties, March 2025, for all 7 statistical areas in Dartford. Counts rounded by the VOA.
Why Choose GS Renovation in Dartford
An open plan ground floor is judged on how it looks once the dust has gone, and on whether the paperwork exists when you sell. GS Renovation settles the beam depth and the finish with you before anything is propped, builds to the engineer's calculations, and coordinates the Dartford building control inspections so the steel is seen before it is boarded. Abdelaaziz Saaid is your single point of contact. We are fully insured, and quotations are free and carry no obligation.
Giorgio is an excellent and intelligent workman, and with very reasonable prices! He installed a kitchen extractor fan in a complicated situation…
George was brilliant. Lovely bloke, very reasonably priced and a perfectionist to boot. He completed our small kitchen renovation with care and great…
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 Dartford
What drives the cost of open-plan conversion in a Dartford home?
Scope drives the price of open-plan conversion in Dartford first, condition second and access third, inside £3,000 to £8,000 or more (London-derived). Scope is set by the regulations as much as the design: the work needs building regulations approval of the steel and interlinked alarms. GS Renovation shows that element separately, and the DA1 survey establishes all three before a figure is committed.
Do you have to keep a door between the stairs and the new open space?
That is decided under the Building Regulations, on how you would escape from the upper floors, and it is settled with Dartford Borough Council rather than assumed. The council runs its own building control service with a dedicated team of building control surveyors, and offers a building notice route or a full plans route. Full plans puts the layout in front of them before the wall comes out, which is the point at which a change is cheap.
Does the new beam support need its own foundation on the alluvium along the Darent?
It might, and an inspection pit settles that rather than the drawings. The British Geological Survey maps the superficial deposit through Dartford town centre, along the line of the River Darent, as Alluvium, classified as silt. Where the removed wall's load lands on a single new pier, the existing footing under that point may not have been sized for it. The engineer we appoint decides after seeing what is actually there.
Can the internal wall come out while a rear extension is being built?
Yes, and running them together saves opening the ground floor twice. They are two consents, though, on different timetables. The extension needs planning, judged against guidance in The Dartford Plan to 2037 that single storey rear extensions on semi-detached and terraced properties should generally not be greater than 3.5 metres in depth on a common boundary. The wall removal needs building regulations approval, through a building notice or full plans.
Does opening up the ground floor of a house you let to sharers need planning permission?
The wall removal does not, but the use might. Dartford Borough Council brought in an Article 4 direction for houses in multiple occupation covering the borough north of the A2 on 8 December 2025, and confirmed it on 23 February 2026. A second direction covering the area south of the A2 takes effect on 10 December 2026, from which date planning permission is required to convert a house into an HMO for up to six occupants.
The wall you want removed has a chimney breast in it. Does that change the job?
Yes, into two structural decisions rather than one. The wall's load has to be carried by the new beam, and whatever remains of the stack above has to be supported separately, to the same engineer's design. Both are inspected before they are covered. An unsupported stack is the failure that Dartford Borough Council's out of hours emergency team of experienced building surveyors exists to be called to, and it is avoidable at design stage.
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