Steel beam installation, RSJ and structural alterations in Catford. Trusted, professional, 30+ years' hands-on experience.
GS Renovation installs steel beams and RSJs across Catford, where SE6 is dominated by bay-fronted Victorian and Edwardian terraces with rear closet wings and side returns. With over 30 years of structural experience in South East London, we remove load-bearing walls safely and get the work signed off by Lewisham building control.

The wall between the two ground-floor reception rooms in a Catford terrace is nearly always load-bearing, carrying the floor above and often the chimney stack. Before anything is touched, a structural engineer sizes the beam for the actual span and load, and we work out the bearing points at each end. We then set out padstones, usually mass concrete or a proprietary bearing block, so the steel transfers weight cleanly into the solid brickwork.
On site we prop the structure with adjustable steel props and strongboys, take the wall down in careful stages, and lift the beam into position before removing the temporary support. In these SE6 terraces the masonry is soft lime-mortared brick, so we work methodically to avoid disturbing the floors above and keep the rest of the house stable throughout.
In a terraced street the dividing walls and chimney breasts often sit within a shared party wall, so cutting a beam pocket into next door's structure brings the Party Wall Act into play. We flag this early, help you serve the correct notice on adjoining owners, and coordinate the timing so the works stay lawful and neighbourly. This matters on the tight-knit terraces running between Catford and Forest Hill.
Every beam we install is notified to Lewisham Council building control, who inspect the padstone bearings, the beam itself and the fire protection before sign-off. We handle the inspection bookings, the engineer's calculations and the completion certificate, so you finish with the paperwork a future buyer or surveyor will want to see. Nothing is boxed in until building control is satisfied.
Catford homeowners choose GS Renovation because we treat steelwork as a structural job first, not a quick knock-through. We work to the engineer's calculations, prop safely, respect the shared party walls common in SE6 terraces, and see the job through Lewisham building control to certificate. Over 30 years in South East London means we have opened up hundreds of period homes like yours.
George did a great job on our new bathroom. He is a really friendly and helpful guy and always ready to discuss any issues or concerns and come up…
I am very happy to recommend George after he completed the work on my 2 bathrooms. He worked very hard to make sure everything was completed and even…
He was very very good. He just got on with the job and we was beey pleased with the result. He Also cleaned everything away when he finished. Will…
FAQ
Expect the figure to track scope rather than postcode. The RSJ and steel beam installation elements that move a quotation are span, access and condition, all of which we check at the SE6 property before writing anything down. GS Renovation then itemises labour, materials and the Lewisham Council element for your Catford home. Comparing that against another Lewisham builder is straightforward because every line is visible. Ring 07472 424 226 and we will arrange a free survey at the SE6 property in Catford. 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.
A visit, and access to more than the room itself. Designing a beam for your Catford house requires the joist direction above, the wall build up, the condition of the masonry at each proposed bearing and what lies beneath those points. Some of that means lifting a board or opening a small area of plaster. A design produced from a sketch and a photograph is an estimate wearing the wrong name.
Yes, if the possibility is raised before the calculations are issued. An extension added to your Catford house later can change what the rear wall carries and where load arrives, and a beam sized only for the present arrangement may not suit. Allowing for it now is usually a modest change to the section. Retrofitting a heavier beam into a finished room is not modest at all.
With temporary protection designed into the programme. Opening the back of a Catford house exposes the interior to weather, so the opening is sheeted and secured at the end of each working day and the structural sequence is planned so the period of exposure is short. Where the work runs over several days, temporary doors or boarding go in. Security matters as much as the rain.
The building control body attends at agreed stages, and the key one is before the beam is concealed. On a Catford job the bearings, padstones and any fire protection have to be visible when the inspector calls, so those are booked into the programme rather than left to the end. A completion certificate follows once the work has been inspected and accepted.
Boards are pieced in and levels corrected so the line of the old wall does not read through the finished floor. In a Catford house the two rooms either side frequently have different floor build ups, and the gap left by the masonry runs the full width. Where a single finish is going down across the whole space, the levelling is done before it is laid rather than disguised afterwards.
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 Catford. Explore what else we do locally:
Same Service, Nearby Areas
We carry out RSJ and steel beam installation across Catford and the surrounding areas. Explore a nearby location:
Free, no-obligation quote for RSJ and steel beam installation in Catford. Rated 4.9 from 31 reviews on MyBuilder, fully insured, and building control handled for you.