RSJ and Steel Beam Installation Croydon
Steel beam and RSJ installation in Croydon, 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 Croydon, from the 1930s semis of Purley and Coulsdon to the Victorian and Edwardian terraces around Addiscombe and SE25. We remove load-bearing walls safely and leave the house properly supported.
In Croydon, 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 Croydon.
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 Croydon address and an itemised quote.
- The engineer we appoint sizes the beam, and the work is registered with Croydon 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.
Steel beams for Croydon semis and terraces
The 1930s semis on the generous plots of Purley, Coulsdon and Shirley, and the older terraces nearer the centre, were built with load-bearing internal walls dividing the front and rear reception rooms. Opening these up calls for a steel beam sized by a structural engineer to carry the floor and, on a two-storey removal, the load above. The engineer calculates the bearings and confirms the spans, and we cast or supply the padstones at each end before any brick is touched.
Every removal begins with temporary propping (Acrow props and strongboys) so the structure is fully supported during a staged demolition. We lift the beam into position, seat it onto the padstones, pack and pin it tight, then submit the work to Croydon Council building control for inspection and sign-off. Nothing is closed up until the beam is signed off.
Housing in Croydon
Croydon has around 168,270 homes on the Council Tax list: 48% post-war, 24% interwar and 28% predate 1919, with 44% flats and 56% houses. Terraced houses make up 28% of homes here, and a beam in a terrace in Croydon often bears on the party wall, bringing in the Party Wall Act.
Timing a Croydon beam around the inspector's working day
Where Croydon Council's own building control service inspects the job, its inspections take place between 10:30am and 3:30pm on weekdays only, not including bank holidays. That window shapes a beam programme more than people expect. A beam is usually lifted, seated and packed in one day, then the props stay while the packing takes up the load. The inspector needs to see the steel, the padstones and the packing before anything is boxed in or plastered, so the lift belongs early in the week, never on a Friday afternoon.
Visits are requested online and must be booked at least 2 working days in advance, so on a Croydon job the booking goes in when the steel is ordered, not when the lorry arrives. We aim for a visit the day after the lift, with fire board and plasterboard held back until it has happened. If the visit slips, the room stays propped and unfinished for longer, which hurts when the props stand in the only living room. A bank holiday week loses a day of possible visits, so avoid lifting just before one.
Party walls in Croydon semi-detached houses
In a Croydon semi the dividing wall with next door, along with the chimney stack, usually sits within a shared party wall. Where a beam bears into that wall, or where we cut into it, the Party Wall etc. Act 1996 applies and you serve formal notice on your neighbour as building owner. We flag this early so notices go out in good time and the schedule is not held up by a missed step.
This matters most on the older terraces and semis around Thornton Heath in CR7 and the streets near South Norwood in SE25, where houses share masonry. We coordinate the engineer's design, the notice period and the building control booking together, so the propping, the steel and the inspection all line up and the disruption to your home stays as short as possible.
What happens to the floor above the beam
The joists over the wall you are removing currently rest on it, and once it has gone they have to rest on something else. In most Croydon semis they either bear on top of the new steel or are cut back and hung from it on joist hangers, and which of those applies is the engineer's call. It affects the room upstairs, because hanging joists means lifting boards up there and working in a bedroom, not only downstairs.
Expect some disruption above as well as below. A floor that has settled around a wall for ninety years will move very slightly when its support changes, so hairline cracking in the upstairs plaster is normal and is made good as part of the work. We leave the propping in place until the load has transferred properly, which is the single biggest factor in how little movement you actually end up seeing.
- Steel columns, base plates and bolted connections
- Structural engineer's calculations arranged and followed
- Structural openings for open-plan living
VOA Council Tax stock of properties, March 2025, for all 45 statistical areas in Croydon. Counts rounded by the VOA.
Why Choose GS Renovation in Croydon
Croydon homeowners choose GS Renovation because we treat steel work as structural engineering, not guesswork. One team manages the engineer's calculations, the propping, the padstones and the Croydon Council building control sign-off. With our founder's 30+ years on the tools, we open up Croydon homes cleanly and leave every load properly carried.
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…
George was brilliant. Lovely bloke, very reasonably priced and a perfectionist to boot. He completed our small kitchen renovation with care and great…
Giorgio is an excellent and intelligent workman, and with very reasonable prices! He installed a kitchen extractor fan in a complicated situation…
FAQ
Frequently Asked Questions about RSJ and Steel Beam Installation Croydon
Do you charge for a survey before quoting RSJ and steel beam installation in Croydon?
An RSJ and steel beam installation survey in Croydon costs nothing, and it is part of quoting rather than a service to bill for. GS Renovation allows enough time at CR0 to check the mixed period and post-war details that move a figure within £1,500 to £4,000 for one beam opening (indicative), and to plan the order: the steel is delivered and checked before the wall is opened. Nothing is owed if you go elsewhere in Croydon.
Do I need a party wall notice to put a steel beam in my Purley semi?
Often, yes. In many Purley and Coulsdon semis one end of the beam bears into the shared party wall with your neighbour, which brings the work under the Party Wall etc. Act 1996. You must serve formal notice before starting. We arrange the structural engineer's design and the Croydon Council building control inspection together so the job runs to schedule.
What sits under the padstone in a Croydon interwar house?
A pier of existing masonry, and below that a footing that may be shallower than you expect. The beam concentrates load at two points, so the engineer checks that the brickwork and the foundation beneath each end can take it. That can mean a trial hole beside the wall. Where the footing is inadequate, a new pad foundation is cast, and building control inspects the excavation before concrete.
Which rooms in my Croydon house need clearing when a beam goes in?
More than the one room. Props stand on both sides of the wall, so furniture is cleared from each room, and the bedroom above may need clearing if boards are lifted there. Floors along the route in are protected, and dust screens are set up at doorways. Circuits and pipes in the wall are isolated first, so plan for some rooms without power or heating.
Can one steel frame take out two walls in my Croydon semi?
Often, yes. Where two walls meet at a corner, for example the spine wall and a kitchen wall, the engineer can design a frame of beams meeting on a steel post, or a goalpost frame standing on its own foundations. That creates one wide L-shaped space. It is more complex than a single beam, but one set of calculations and one building control inspection covers it.
What documents should I keep after an RSJ is fitted in my Croydon home?
The engineer's calculations and drawings, Croydon Council's building control completion certificate, any party wall award or written consent from next door, and the electrical certificate if circuits were changed. Photographs of the padstones before they were covered are worth keeping as well. A buyer's solicitor will ask about structural alterations when you sell, and this file answers them.
What drawings does a Croydon full plans application need for a new steel beam?
Croydon asks for detailed drawings including floor layouts, cross sections and details of construction methods and materials. For a beam, that means a plan showing where the opening goes, a section through it showing the steel, the padstones and the wall each end sits on, and a note of the steel grade and its fire protection. The structural engineer we appoint prepares the calculations and details, and we check them against what we find once the plaster is off.
Is fitting a beam different in a Croydon house built since 2000?
Often, yes. 15% of homes in Croydon were built in 2000 or later, and houses of that age can use engineered timber joists, a timber frame inner leaf or thin blockwork rather than solid brick. Engineered joists cannot be notched or trimmed like sawn timber, and a timber frame wall may carry load through studs that are not obvious from the room. Find the original construction drawings before the engineer visits, because they save opening up and show where loads come down.
Whose agreement is needed before a beam goes into a ground floor flat in Croydon?
Usually the freeholder's and the upstairs owner's. 44% of homes in Croydon are flats, and in a converted house the ceiling of the ground floor flat is the floor of the flat above. A lease normally requires the freeholder's written licence before structural work. That shared floor can also count as a party structure under the Party Wall Act, and where the work affects it, you, as the building owner, serve notice on the owner upstairs. Settle both before the steel is ordered.
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