RSJ and Steel Beam Installation Tooting
Steel beam and RSJ installation in Tooting, 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 RSJs and steel beams across Tooting, where the bay-fronted Victorian and Edwardian terraces of SW17 were built with load-bearing walls and shared chimney stacks. We open up these period homes safely, from ground-floor knock-throughs to full rear openings.
In Tooting, 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 Tooting.
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 Tooting address and an itemised quote.
- The engineer we appoint sizes the beam, and the work is registered with Wandsworth 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 Tooting
The most common structural job in Tooting is taking down the wall between the two front reception rooms, or opening the rear wall into a closet wing. In these SW17 terraces that wall almost always carries load from the floor and roof above, so a structural engineer sizes the RSJ, we install temporary props, then remove the masonry in stages before lowering the new beam onto padstones at each bearing.
Where the new beam bears into the party wall shared with the neighbouring house, which is often the case in Tooting's tightly packed streets, the Party Wall Act applies and you serve the notice as the building owner before work begins; we give you the engineer's drawings it needs. Every beam is checked and signed off by Wandsworth building control, so the structure is documented and compliant. We keep the house propped and stable throughout, and make good the ceilings and walls afterwards.
Housing in Tooting
Tooting's housing, as the Council Tax list records it, is about 23,930 homes: 38% houses, 62% flats, with 67% pre-1919, 8% interwar and 24% built since 1945. A beam in a leasehold flat in Tooting needs the freeholder's licence for alterations, since the lease usually keeps the structure with the freeholder, which matters here because most homes are flats.
Declaring the beam span on a Wandsworth extension application
When a Tooting house gains a rear extension, the steel that replaces the old back wall goes on the same building control application as the extension. Wandsworth's extension charge already covers a modest opening from the house into the new room, up to 1.5m wide, and the schedule warns that a wider structural opening, over 1.5m, may be charged extra. A kitchen opening across the back of a terrace is usually wider than that. Put the clear span and the beam section on the application from the start, so any extra charge is known on paper instead of turning up as a query once the steel is already sitting on its padstones.
Payment is staged as well. On a full plans application, Wandsworth asks for 40% of the total building control charge with the application, then invoices the other 60% once the first site visit has happened. On an extension that first visit is often the check on the foundation trenches, so the larger invoice can arrive early in the job, well before the steel goes in. Budget for it from the start rather than at the stage the opening is formed. Keep the approved drawings in the house too, because when the beam goes in the inspector compares the bearing details on them with what is actually packed under each end.
Steel beams for Tooting kitchen extensions
When Tooting homeowners extend to the rear or infill the side return, the original back wall of the house comes out and a steel beam takes the load in its place. The structural engineer we appoint sizes the steelwork to suit the new open-plan span, and we build in the padstones or spreader plates they specify so the load transfers cleanly into the existing brickwork. Larger openings sometimes need a goalpost frame with steel posts rather than a single beam.
Because SW17 terraces sit wall to wall with their neighbours, the beam bearings frequently land in the shared party wall, which means a party structure notice from you as the building owner, and an award if your neighbour dissents, before we cut in. We coordinate the propping, the demolition and the beam lift so the house is never left unsupported, and building control inspects the steel before it is cased in. The result is a wide, uninterrupted opening between your kitchen and garden with no visible structure.
- RSJ and structural steel beam installation
- Temporary propping and staged, controlled demolition
- Steel columns, base plates and bolted connections
VOA Council Tax stock of properties, March 2025, for all 7 statistical areas in Tooting. Counts rounded by the VOA.
Trusted RSJ and Steel Beam Installation in Tooting
Tooting homeowners choose GS Renovation because we have removed load-bearing walls in SW17 terraces, backed by our founder's 30+ years on the tools, and treat the structure as the priority. We work to the engineer's design, prop safely, programme the job around your party wall notice and book Wandsworth building control at every stage, so the beam is right, signed off and hidden in a clean finish.
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…
George always kept to commitments and arrived on time. He offered helpful suggestions during his initial visit and promptly provided a reasonably…
FAQ
Frequently Asked Questions about RSJ and Steel Beam Installation Tooting
Are there hidden costs with RSJ and steel beam installation in Tooting?
The risk of extra cost on RSJ and steel beam installation in Tooting sits in what is concealed. GS Renovation lists what the SW17 survey could not inspect, so you know where the figure within £1,500 to £4,000 for one beam opening (indicative) might move. The masonry at each bearing decides the padstone detail, which is why that point is opened up early. The Wandsworth Council building control fee and the engineer's design are priced from the start.
Do I need a party wall agreement to put a steel beam in my Tooting terrace?
Usually yes. In Tooting's SW17 terraces the beam often bears onto the party wall shared with your neighbour, so the Party Wall Act applies and notice must be served before work starts. You serve the notice as the building owner, or appoint a party wall surveyor to do it, and we supply the engineer's drawings it needs. The beam itself still needs a structural engineer's design and Wandsworth building control sign-off.
Where does an RSJ bear in a Tooting terrace with solid walls?
On a padstone built into the brickwork at each end, sized by the engineer to spread the load. Tooting's Victorian walls are solid brick in lime mortar, softer than modern masonry, so the padstone is what spreads the beam's concentrated load safely into it. Where one end lands in the party wall, the pocket needs a party structure notice two months ahead. The inspector sees the bearings before anything is boxed in.
Can an RSJ go in under a Tooting upper flat without disturbing the neighbours?
Mostly, yes. The props, cutting and steel all stay within your flat, and the upstairs owner's floor is held up from below throughout. They receive a party structure notice because their floor is shared structure, and a record of their flat's condition is taken first. Noise during cutting is unavoidable, so tell them the day it happens, and keep to any working hours in the lease.
Why would the engineer open up the floor before designing a Tooting beam?
To see which way the joists run, what they bear on and whether earlier owners have notched, cut or already altered them. Victorian terraces in SW17 have often been remodelled more than once, and hidden changes alter the load. Lifting a few boards upstairs, or cutting a small hole in the ceiling, lets the engineer base the steel size on facts rather than assumptions.
How are the upper floors of a Tooting terrace held up while the RSJ goes in?
Adjustable props stand on boards either side of the wall, and strongboys slot into the brickwork to carry the masonry above the cut. On a timber ground floor, props may need to run down to solid ground rather than stand on joists. They stay until the beam is seated on its padstones and fully packed, and building control has inspected.
Is a steel beam in a post-war Tooting flat designed the same way as in a Victorian terrace?
Not always. 24% of homes in Tooting were built after 1945, and a block from that period may have concrete floors or concrete cross walls rather than timber joists resting on brick. A slab can span in a direction nobody expects, and cutting a wall in it can affect the flats above and below. The appointed engineer asks the freeholder or managing agent for the original structural drawings before any steel is sized.
How is a building control application for an RSJ made in Wandsworth?
Wandsworth Council runs its own Building Control service, and it accepts an application either through the Planning Portal's building control service or as a downloaded form sent by email to buildingcontrol@wandsworth.gov.uk. Charges follow the schedule in force from 1 April 2026, so a fee remembered from a neighbour's job or an older quote may be out of date. The structural engineer we appoint provides the calculations and steel details, and we make sure they go in with the drawings and the form, so the application is complete from the start.
Where does a steel beam bear in a Tooting house built between the wars?
Possibly on a cavity wall rather than solid brick. 8% of homes in Tooting were built between 1919 and 1939, and houses from that period may have two thin leaves of masonry with a gap between them. The beam normally bears on the inner leaf, so the engineer checks that leaf can take a concentrated load and details the padstone and any cavity tray. Opening up a small patch of plaster first confirms what the wall really is.
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