Steel beam installation, RSJ and structural alterations in Streatham. Trusted, professional, 30+ years' hands-on experience.
GS Renovation installs steel beams and RSJs throughout Streatham, where bay-fronted Victorian and Edwardian terraces line the SW16 streets. With over 30 years of structural building across Lambeth, we open up these period homes safely, removing load-bearing walls and carrying the loads onto correctly sized steel and solid padstones.

The typical SW16 terrace has a solid brick wall between the front bay reception and the middle room, and another where the rear closet wing meets the main house. Both are usually load-bearing. Before any demolition we have a structural engineer size the beam to the loads above, then we install temporary props to take the weight while the old brickwork comes down in a controlled, staged sequence.
The new RSJ bears onto concrete or engineered padstones spread across the remaining masonry, so the point loads transfer safely into the wall. We check the bearings, pack and pin the steel, then make good before the props come out. Every beam in Streatham is signed off by Lambeth building control, giving you documented proof the structure is sound for the future.
Streatham terraces share a party wall with the neighbours on each side, and chimney breasts and dividing walls often sit within that shared structure. Where a beam bears into or cuts into a party wall, the Party Wall etc. Act 1996 applies. We flag this early so you can serve the correct notices on adjoining owners well before work starts, avoiding disputes and delays.
Cutting a beam pocket into a party wall demands care, because you are working within masonry your neighbour relies on too. We prop from both sides where needed, form clean bearings and keep the neighbouring wall stable throughout. Good notice, tidy method and clear communication with adjoining owners keep these SW16 projects running smoothly from first prop to final sign-off.
A steel beam changes a few practical things once you are using the room. You cannot fix into it with an ordinary plug, so if you want a curtain track, a projector or a bank of shelves near the beam line, say so before it is boxed in and we will build timber grounds into the casing to fix to. Retro fitting that later means opening the boxing back up and redecorating.
Expect a little hairline cracking at the junctions during the first year. Plaster shrinks and a new opening settles slightly, so a fine crack along the casing is normal rather than a fault and gets filled at the first redecoration. What is not normal is a crack that widens, or one appearing in masonry above the beam. That is worth telling us about, and it is one reason we hand over the engineer's drawing. Decorating is best left a few weeks after the props come out, so the opening has settled before the first coat goes on.
Streatham homeowners choose GS Renovation because we treat steelwork as the structural heart of the job, not an afterthought. We coordinate the engineer, propping, padstones and Lambeth building control, and we coordinate the work around the party wall award for shared walls. Thirty years across SW16 means we know how these terraces are built and how to open them up safely.
It's the second time I have hired George and he has been absolutely professional and the work he did resembles perfectly what I had in mind. Being an…
Really happy with the quality of remedial works carried out by George in putting other previous tradesman work right. He was very helpful, honest and…
George is a very hard working builder, and has done a fantastic job on replacing my Bathroom. His attention to detail was great and I wouldn't…
FAQ
Not a real one, no. We can explain on 07472 424 226 how RSJ and steel beam installation is usually approached in a Streatham home and what tends to move the cost, but the SW16 property has to be seen before GS Renovation commits anything to paper. Builders who quote blind across Lambeth are the ones who revise later. Email info@gsrenovationltd.co.uk with the address and we will arrange a time. The SW16 survey carries no obligation of any kind. 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 written programme is part of the quotation for every Streatham home. It covers the RSJ and steel beam installation stages, the trades in sequence, and the points at which Lambeth Council must inspect before work is concealed at SW16. GS Renovation books those inspections ahead so the job is not waiting on paperwork. Ask on 07472 424 226 about current start availability across Lambeth. Nothing is concealed at an SW16 address before Lambeth Council has been to see it.
All 31 of them, on MyBuilder, where they cannot be edited by us. They cover RSJ and steel beam installation and the rest of what GS Renovation does across Streatham and Brixton, and the 4.9 average is the honest picture rather than a selected one. References for an SW16 property are available on request. Ring 07472 424 226 and we will point you at recent Lambeth work. Nothing in those reviews is selected or edited by GS Renovation in Streatham.
If the beam bears into a wall shared with a neighbouring property, yes, and that covers most terraces and semis in Streatham. Notice must be served before work begins, and the duty sits with you as building owner. We prepare the notices for your SW16 address.
More demanding in places, but not harder for a team that works on them constantly. RSJ and steel beam installation at an SW16 address of that age needs proper investigation before design and more care in the finishing afterwards. GS Renovation allows for both in the Streatham programme. The structural stage itself is usually no more complex than in a newer Lambeth property. Ask on 07472 424 226 how RSJ and steel beam installation runs on a comparable SW16 house in Lambeth.
Very often yes. Streatham terraces share a party wall with the house next door, and if the new steel bears into or cuts into that shared wall, the Party Wall etc. Act 1996 applies. You must serve notice on the adjoining owner first. We identify this at survey and guide you on timing so the notices are served before demolition begins.
All of them, including the streets around SW16 and out towards Brixton. GS Renovation treats RSJ and steel beam installation across Streatham as core work rather than an occasional trip, and we are usually on another Lambeth site nearby. That often means a survey can happen quickly. Ring 07472 424 226 with the postcode and we will confirm. Nothing is owed for the Streatham visit either way. Aftercare visits are equally straightforward from a nearby Lambeth site.
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The same trusted team, 30+ years' hands-on experience and free, no-obligation quotes apply to every GS Renovation service in Streatham. Explore what else we do locally:
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We carry out RSJ and steel beam installation across Streatham and the surrounding areas. Explore a nearby location:
Free, no-obligation quote for RSJ and steel beam installation in Streatham. Rated 4.9 from 31 reviews on MyBuilder, fully insured, and building control handled for you.