Steel beam installation, RSJ and structural alterations in Sidcup. Trusted, professional, 30+ years' hands-on experience.
GS Renovation installs steel beams and RSJs across Sidcup, where the DA15 streets are lined with 1930s semi-detached and interwar houses on generous plots. With over 30 years of structural experience in South East London, we remove load-bearing walls and open up these solid interwar layouts safely, from survey through to building control sign-off.

The typical Sidcup job opens up a 1930s semi, taking out the wall between the front reception and the rear dining room, or knocking through to the kitchen to make one bright living space. In an interwar house that dividing wall usually carries the floor and ceiling above, so we never touch it until a structural engineer has sized the beam and specified the bearings for the loads involved.
We begin with temporary propping to support the structure, then carry out a safe, staged demolition rather than pulling walls down in one go. The RSJ is lifted into position, seated onto padstones at each end and packed tight so the load transfers cleanly. Everything is inspected by Bexley Council building control before we plaster over.
Because Sidcup is dominated by semi-detached houses, the dividing wall between you and your neighbour is a shared party wall, and the chimney stacks often sit within it. Where a new beam bears into that wall, or where we cut pockets for padstones, the Party Wall etc. Act 1996 applies. We flag this early so you can serve the correct notice on your neighbour in good time.
Serving notice properly protects you and keeps the project on schedule, avoiding disputes once work starts. We coordinate the structural engineer's calculations, the padstone details and the building control application together, so the steelwork, the bearings and the party wall matters are all handled as one job rather than left for you to chase separately.
If a rear extension is likely at some point, it is worth telling the engineer now even though the money is not there yet. An opening formed today can be positioned and sized so it still works when the back of the house comes off in five years, which saves taking out a beam you have only just paid for. Where a bearing will later sit in a wall that is coming down, that is far better known in advance.
The same is true in reverse. On the generous DA15 plots around Foots Cray Meadows, plenty of owners open the two receptions first and extend later, and the two projects can share a design intent even years apart. Keep the engineer's drawings, because the next engineer will want them. A beam designed for the loads it carries today cannot be assumed capable of carrying an extension roof as well, so it gets checked rather than hoped over.
Sidcup homeowners choose GS Renovation because we treat steelwork as the structural job it is, not a quick knock-through. One accountable team manages the engineer's calculations, the propping, the padstones and building control sign-off, backed by 30+ years across DA15 and the wider Bexley borough. You get a genuinely open, structurally sound home.
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FAQ
It depends on the house, which is exactly why the survey comes first. In interwar semis and short terraces with hipped roofs and rear kitchens the reinstatement often outweighs the structural element of RSJ and steel beam installation, whereas a newer DA15 property is the other way round. GS Renovation prices the two separately so a Sidcup client can see the balance. Phasing the work is then possible if the budget needs it. Ring 07472 424 226 and GS Renovation will talk through phasing options for a DA15 home. As a rough guide, RSJ and steel beam installation in London runs roughly £1,500 to £4,000 for the beam itself on a single straightforward opening, covering supply, installation and building control sign-off; a full knock-through including taking the wall out, the structural engineer's fee and making good more typically comes to £2,500 to £6,500 or more (indicative London ranges, MyBuilder and Checkatrade, 2026). Your figure depends on the size, specification and condition of the property, which is why we survey before quoting.
That depends on how booked we are, and you will get a straight answer rather than a comfortable one. GS Renovation usually schedules RSJ and steel beam installation a few weeks ahead for Sidcup homes, and getting the DA15 survey done early is what secures a slot. Where Bexley Council approval is needed the application runs in parallel. Ring 07472 424 226 for current availability across Bexley. Email info@gsrenovationltd.co.uk with the DA15 address and we will book a survey.
Over 30 years of hands-on experience sits behind every judgement made on your DA15 site. That is our founder's, and it shows in how RSJ and steel beam installation is scoped in 1920s and 1930s suburban housing before anything is committed. GS Renovation is fully insured, handles Bexley Council approvals and leaves the Sidcup site clean each day. Ring 07472 424 226 and speak to the people who will actually do the Bexley work. Ask to meet the named manager beforehand.
If the beam bears into a wall shared with a neighbouring property, yes, and that covers most terraces and semis in Sidcup. Notice must be served before work begins, and the duty sits with you as building owner. We prepare the notices for your DA15 address.
Almost all, which is exactly why the survey matters. RSJ and steel beam installation at a DA15 address of that age is priced on what we find rather than on a standard detail, and GS Renovation has done enough of them across Sidcup and Bexleyheath to know where to look. The 31 public MyBuilder reviews cover the same work. Ring 07472 424 226 for recent examples. Ask on 07472 424 226 what RSJ and steel beam installation usually finds at a DA15 address of that age.
Very likely, yes. Sidcup semis share a party wall with the neighbouring house, and if a new steel beam bears into that shared wall the Party Wall etc. Act 1996 applies. We identify this at survey stage and help you serve the correct notice in good time. The beam itself still needs building control sign-off under building regulations, which we manage alongside the party wall process.
Almost certainly, and we will confirm it in a minute rather than leave you guessing. GS Renovation covers Sidcup and the DA15 area for RSJ and steel beam installation, along with neighbouring parts of Bexley. Ring 07472 424 226 or email info@gsrenovationltd.co.uk with the DA15 address before you spend time on drawings. There is no charge for asking, and none for the survey either. We would rather tell you straight away than quote and hope. Small jobs are welcome at DA15 too.
Every Service, One Team
The same trusted team, 30+ years' hands-on experience and free, no-obligation quotes apply to every GS Renovation service in Sidcup. Explore what else we do locally:
Same Service, Nearby Areas
We carry out RSJ and steel beam installation across Sidcup and the surrounding areas. Explore a nearby location:
Free, no-obligation quote for RSJ and steel beam installation in Sidcup. Rated 4.9 from 31 reviews on MyBuilder, fully insured, and building control handled for you.