RSJ and Steel Beam Installation Catford
Steel beam and RSJ installation in Catford, designed by the engineer we appoint and signed off by building control.
- Rated 4.9 from 31 reviews on MyBuilder
- London guide: £1,500 to £4,000
- Free site survey, itemised quote
GS Renovation installs steel beams and RSJs across Catford, where most of the housing is Victorian and Edwardian terraces with rear closet wings and side returns, many of them now split into flats. We remove load-bearing walls safely and get the work signed off by Lewisham building control.
In Catford, a steel beam for one opening typically costs £1,500 to £4,000 fitted and signed off, or £2,500 to £6,500 or more for a full knock-through with the engineer's fee and making good (indicative London ranges, MyBuilder and Checkatrade, 2026). GS Renovation Ltd, a building contractor based in Potters Bar, does the work in Catford.
Price guide
| Work | Indicative London range |
|---|---|
| Steel beam, one opening: supply, install, sign-off | £1,500 to £4,000 |
| Full knock-through with engineer and making good | £2,500 to £6,500+ |
Indicative London ranges (MyBuilder and Checkatrade, 2026), not a quotation. Prices checked September 2026. Full breakdown: RSJ & Load-Bearing Walls.
How the job runs
- Free site survey at your Catford address and an itemised quote.
- The engineer we appoint sizes the beam, and the work is registered with Lewisham Council building control or an approved inspector. On a shared wall you serve the party wall notice as building owner; we supply the drawings.
- Props go in, the opening is cut and the beam is set on padstones, packed tight above.
- Building control inspects the steel before it is covered. We make good, and the completion certificate follows.
Removing load-bearing walls in Catford terraces
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.
Housing in Catford
About 7,650 homes are listed for Catford, and the mix is 34% houses to 66% flats, with 33% built after 1945, 4% in 1919 to 1939 and 61% earlier. Where most homes are flats, a beam in a leasehold flat in Catford needs the freeholder's licence for alterations, since the lease usually keeps the structure with the freeholder.
A beam under another household's floor in a Catford conversion
66% of Catford homes are flats, and some of those are period houses split floor by floor. When the owner of a ground floor flat in one of these Catford conversions has a wall replaced with steel, the beam carries the floor of the flat above, and sometimes a partition standing on it. The structural engineer we appoint therefore designs for stiffness as well as strength. A beam that is strong enough but bends a little more under load still shows as cracked plaster and sticking doors upstairs, in a home that is not yours and whose owner never asked for the work.
Where the steel goes matters too. A beam hung below the ceiling leaves the joists alone. A beam set flush within the ceiling depth means cutting joists that form the floor between the two flats, and in a Catford conversion that floor may not be yours alone under the lease. Lewisham names removal or partial removal of joists and beams among the structural alterations that need building control approval, but the freeholder's licence and the upstairs owner's agreement come first, with any party wall notice served by you as building owner. We price both options so the choice between a downstand and a flush beam is made with the paperwork in view.
Building control in Catford
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 book the inspections, supply the engineer's calculations and hand you building control's 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.
- Load-bearing wall removal and knock-throughs
- Steel columns, base plates and bolted connections
- Making good, plastering and finishing around the new steel
VOA Council Tax stock of properties, March 2025, for Catford East & Mountsfield Park and Catford Bridge. Counts rounded by the VOA.
Trusted RSJ and Steel Beam Installation in Catford
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. Our founder's 30+ years on the tools means we know how period homes like yours are built.
Reviewed jobs near Catford
1 MyBuilder review from Crofton Park, with each customer's own job title:
- Replace small section of wooden worktop, sink, tap and gas hob, Crofton Park, 17 Apr 2024 (5 out of 5)
Read all 31 on our reviews page.
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FAQ
Frequently Asked Questions about RSJ and Steel Beam Installation Catford
How much should RSJ and steel beam installation in Catford cost?
Expect RSJ and steel beam installation at a Catford address to cost £1,500 to £4,000 for one beam opening (indicative), with the property rather than the postcode deciding the figure. At the SE6 survey GS Renovation confirms the detail that matters most, because the masonry at each bearing decides the padstone detail. Labour, materials and the Lewisham Council building control fee are then itemised, so another Lewisham quotation can be compared line by line.
What does the engineer need before quoting steelwork in Catford?
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.
Can a Catford beam be designed to allow a later extension?
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.
How is a Catford house kept weathertight while the rear wall is open?
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.
What inspections happen during steelwork at a Catford property?
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.
How is the floor made good where a Catford wall stood?
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.
How long does Lewisham take to approve drawings for a Catford steel beam?
On a full plans application Lewisham Building Control sends its decision within five weeks, unless the applicant has given a three week extension. For a beam in a Catford conversion flat that wait is often worth it, since the freeholder and the owner upstairs may want to read approved drawings before signing anything. We apply as soon as the calculations from the structural engineer we appoint are complete, then use the five weeks to agree the licence and book the steel.
Does widening the back door opening of a Catford house need building control?
Yes. Widening an opening in a load-bearing rear wall is a structural alteration, and Lewisham's building control fees chart has its own line for structural support for new glazing, such as a new door, even with no internal wall coming out. In a Catford house the lintel over the old back door may be timber and will be too short for the new width. The structural engineer we appoint specifies the steel and its bearings, and the inspector sees them before the new doors go in.
What does the building control inspector check on a Catford beam besides its size?
Fire safety, among other things. Lewisham Council's own building control inspectors check that work complies with building regulations on fire safety, energy conservation and access, not only structure. A steel beam in a home usually needs fire protection, usually by boarding it in fire-rated plasterboard or applying an intumescent coating to the structural engineer's specification. In a Catford conversion, where the beam holds up another flat, we leave that protection visible for the inspector before skimming.
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