GS Renovation carries out open plan conversions in Leatherhead, taking out the wall between two rooms and replacing it with steel sized by the structural engineer we appoint. Building control goes to the Southern Building Control Partnership, a shared service established in 2017 that acts for Mole Valley. We coordinate the application and the inspections. Fully insured, with free no obligation quotations.
Who handles building control for an open plan conversion here
The Southern Building Control Partnership does. It is a shared building control service established in 2017, and it acts as the Local Authority Building Control team for Mole Valley. It can be reached on 0330 024 9355 or at theteam@southernbcp.co.uk, though we make the application and book the inspections as part of running the job.
Indicative London ranges, MyBuilder and Checkatrade, 2026, put a full knock through, including wall removal, engineer fee and making good, at £2,500 to £6,500+. Where the job needs only the beam, an RSJ for one straightforward opening runs £1,500 to £4,000. We quote after seeing both rooms, free and with no obligation.
The bearings at each end have to land on something
The beam transfers everything it picks up into whatever sits beneath its bearings, so what is under the house matters. Four different bedrock units outcrop across Leatherhead: chalk, the Thanet Formation, the Lambeth Group and the London Clay Formation. The structural engineer we appoint establishes which is under your address before sizing the pad.
Made ground is a separate question and one worth settling early. British Geological Survey 1:50,000 mapping records no artificial or made ground within Leatherhead, which is a useful starting point rather than a substitute for looking. Where a bearing goes down to a new pad, what is actually in the hole is established on site.
If the opening also changes the front of the house
Where an open plan conversion reaches an external wall, a new window or a wider opening brings the planning side into play. Householder pre-application advice from Mole Valley District Council is a paid, letter based service costing £171.39 including VAT. That letter gives you a written view before the drawings are finalised.
Purely internal work does not raise that question. The wall comes out, the steel goes in, and building control sees the steel before it is covered. We tell you which of the two you are in before we quote.
- Heat loss and acoustic considerations before the wall comes out
- Lighting, heating and electrical reconfiguration
- Open-plan kitchen-diner conversions
- Knock-throughs between front and rear reception rooms
- Level flooring and threshold removal across the whole space
Why Choose GS Renovation in Leatherhead
An open plan conversion touches structure, services and finish at once, so the order of work decides how long the room is out of use. We appoint the structural engineer, build to the calculations, and put the application in to the Southern Building Control Partnership before the propping goes up. Services buried in the wall are traced before it comes down rather than found afterwards. We are fully insured, we coordinate the building control application and inspections, and quotations are free and carry no obligation.
- One point of contact on the phone, not a call centre
- Cooking smells and extraction planned into an open kitchen
- Lighting circuits zoned rather than one pendant in the middle
- Waste cleared as we go, not left piled in the garden
- Clean, tidy and reliable tradespeople
- Structure and finishes delivered by one team on one programme