Steel beam installation, RSJ and structural alterations in Merton. Trusted, professional, 30+ years' hands-on experience.
GS Renovation installs RSJs and steel beams across Merton, from the bay-fronted Victorian terraces of Wimbledon to the Edwardian homes around Mitcham and Morden. With over 30 years of structural work in SW19, SW20, CR4 and SM4, we remove load-bearing walls safely and leave the borough's period houses stronger than we found them.

Most Merton homes are solid-wall Victorian and Edwardian terraces, so the wall between the front and rear reception, or into the closet wing, almost always carries load from above. Before anything comes down, a structural engineer sizes the RSJ and specifies the padstones it bears onto. We install temporary propping, take the wall out in safe staged sections, then seat the beam and transfer the load cleanly.
The chimney breast that so many SW19 and SW20 houses still have adds weight that the new steel must carry, and the closet wing at the rear often needs its own beam. We calculate bearings for each opening, pack the padstones properly and make good so the finished ceiling line runs level, ready for plastering.
The dividing wall between you and next door in a Mitcham or Morden terrace is usually a shared party wall, so cutting a beam bearing into it brings the Party Wall Act into play. you serve the correct notices on adjoining owners in good time and coordinate the surveyor process, so the steelwork goes in without disputes with neighbours.
Steel beam installation is controlled under building regulations rather than planning permission. We arrange building control inspection with Merton Council or an approved inspector, provide the engineer's calculations, and book the checks at propping, beam seating and completion stages. You receive the sign-off certificate that protects the house and any future sale.
The steel is the item that sets the programme on a Merton project. Once the engineer has issued the schedule, fabrication takes several working days, longer where the beam is galvanised or needs welded end plates. Nothing on site can start in earnest before that date is confirmed, which is why the design is fixed before labour is booked rather than the other way round. Anything that has to be moved out of the wall, a gas run or a soil pipe, is dealt with during that fabrication window.
On the day itself, propping is already up and the slot has been cut at high level. The beam is lifted in, packed and bedded onto its padstones, and the masonry below comes out in sections afterwards. Props stay in place while the bedding gains strength, usually several days. Building control sees the bearings before anything is covered, and the plasterer only starts once the props are struck and the beam is carrying properly.
Merton homeowners choose GS Renovation because we treat structural work as the serious job it is. One team handles the engineer's design, the propping, the steel and the building control sign-off, with 30+ years of load-bearing wall removals across SW19, SW20, CR4 and SM4 behind every beam we fit.
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We loved working with George and Ibrahim and would highly recommend them. They have done splendid job on our new kitchen refurb which including new…
FAQ
Not by much, and not because of the postcode. What raises an RSJ and steel beam installation figure here is the housing rather than the location: solid-wall Victorian terraces with original chimney breasts and suspended timber floors take more making good than a modern estate. Access and parking around SW19 affect the labour line too. GS Renovation prices the property in front of it rather than applying a Merton or South West London multiplier. Ring 07472 424 226 and GS Renovation will explain what actually moves the figure at SW19. 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.
The loads, the span, the section chosen and what it bears onto. For your Merton property the calculations establish the weight arriving from the floor, roof and any wall above, size a beam that carries it within acceptable deflection, then size the padstones and the bearing length at each end. Building control assesses that document. It is the reason a section size cannot be quoted from a photograph.
It has to be designed, ordered and fabricated, which is rarely immediate. For your Merton property the sequence runs from survey to the engineer's calculations, then to a fabricator who cuts the beam to length and drills or welds any connections. That lead time sits inside the programme rather than beside it. Work is not started on site until the steel has a confirmed delivery.
Heavy enough that handling is planned rather than improvised. A beam for a modest opening in a Merton house can usually be carried by a team, while a longer or deeper section quickly exceeds what can be lifted safely by hand. Where that is the case the engineer specifies a spliced design or mechanical lifting is arranged. Manual handling is a genuine safety matter, not a question of effort.
The job gets simpler and the engineer still confirms it. Where investigation at a Merton property shows the wall carries nothing, no beam is required and the wall can be removed with only making good to follow. That finding comes from the engineer rather than from an assumption on site. It is worth establishing early, because it changes both the programme and what the work involves.
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 Merton. Explore what else we do locally:
Same Service, Nearby Areas
We carry out RSJ and steel beam installation across Merton and the surrounding areas. Explore a nearby location:
Free, no-obligation quote for RSJ and steel beam installation in Merton. Rated 4.9 from 31 reviews on MyBuilder, fully insured, and building control handled for you.