RSJ and Steel Beam Installation Borough
Steel beam and RSJ installation in Borough, 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 Borough and the wider SE1 postcode, working in its flats and the few Victorian and Edwardian terraces in this part of Southwark. We remove load-bearing walls safely, from streets near Borough Market to the homes running south towards Elephant and Castle.
In Borough, 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 Borough.
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 Borough address and an itemised quote.
- The engineer we appoint sizes the beam, and the work is registered with Southwark 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 Borough flats and terraces
A Borough terrace has solid brick dividing walls carrying the floors and roof above, and a flat in a post-war block has concrete or blockwork carrying the flats overhead, so opening up is never a simple knock-through. We start with a structural engineer, who sizes the RSJ for the exact span and load and specifies padstones to spread the bearing into the solid masonry. Every beam we fit here is calculated for the real conditions of these Victorian and Edwardian houses, not guessed at.
On site we install temporary propping first, hold the structure while the wall comes down in staged sections, and only then lift the steel into position onto its padstones. This careful sequence protects the floors above and the neighbours either side. Because SE1 terraces are tightly packed, we plan access, dust protection and waste removal so the works stay contained within your home throughout.
Housing in Borough
About 12,140 homes are listed for Borough, and the mix is 6% houses to 94% flats, with 73% built after 1945, 3% in 1919 to 1939 and 18% earlier. Where most homes are flats, a beam in a leasehold flat in Borough needs the freeholder's licence for alterations, since the lease usually keeps the structure with the freeholder.
Borough beams bear into old brick or a modern frame
Borough has almost no interwar housing. The VOA records 18% of homes as built before 1919 and only 3% between 1919 and 1939, while 50% were built in 2000 or later. So a beam here is more likely to bear into soft brick laid in lime, or into a concrete or steel frame, than into anything in between. In brick, the structural engineer we appoint sizes padstones to spread the load and may ask for a bearing to be opened first. In a frame, the questions are fixings, fire protection and what the developer's drawings allow. Knowing which one you have is the first thing we establish.
The older buildings can bring a second problem: steel already in the walls with no paper trail. When a Borough flat is found to have an earlier beam with no completion certificate, Southwark Council's online form lets you begin a building regulations application as regularisation, as well as a building notice or full plans. Regularising the old steel alongside the new work means the inspector looks at both while the ceilings are open, rather than the question surfacing again when the flat is sold.
Party walls and building control in SE1
In Borough, the wall dividing you from next door and the chimney stack are almost always a shared party wall, so the Party Wall Act applies when a beam bears into it. You serve the correct notices on adjoining owners in good time, which keeps the project legal and avoids disputes with neighbours in these closely built terraces. Getting this right early prevents costly delays once the propping is up.
Steel beam work is governed by building regulations rather than planning permission, so we arrange building control inspection and sign-off for every installation. The inspector checks the beam size, the bearings, the padstones and the connections against the engineer's design. You receive the completion certificate that proves the structural work was done properly, which matters when you come to sell a home anywhere in Southwark.
- Access and lifting plans for restricted terraced and town-centre sites
- Ceiling and floor levels resolved where the beam sits below joists
- Making good, plastering and finishing around the new steel
VOA Council Tax stock of properties, March 2025, for Borough & Southwark Street and Southwark St George's. Counts rounded by the VOA.
Why Borough Homeowners Choose GS Renovation
Borough homeowners choose GS Renovation because we handle the whole beam job as one accountable team, from engineer's calculations to propping, safe demolition and building control sign-off. Our founder's 30+ years on the tools means we understand solid-wall bearings and tight sites, and we leave you with signed-off, honest structural work you can trust.
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 always kept to commitments and arrived on time. He offered helpful suggestions during his initial visit and promptly provided a reasonably…
Saaid is the best craftsman I have worked with. He knows what he is doing from the very beginning. He has a great knowledge of construction…
FAQ
Frequently Asked Questions about RSJ and Steel Beam Installation Borough
Is a cheap RSJ and steel beam installation quote in Borough worth taking?
Be careful with a cheap RSJ and steel beam installation quote in Borough, particularly if nobody has visited. Pricing a post-war block home unseen is how a low figure becomes a high one halfway through, because the masonry at each bearing decides the padstone detail. GS Renovation surveys, itemises within £1,500 to £4,000 for one beam opening (indicative) and holds the total. A second opinion on the SE1 quotation costs nothing.
What structure is found in the older buildings around Borough?
Deep timber floors, brick walls in lime mortar and occasionally iron columns from former commercial use. Buildings around Borough are frequently older and were built for uses other than housing, so the floors and walls are not domestic in scale or construction. The engineer assesses what is there rather than assuming a standard arrangement, because the load path in these buildings is often not where it appears to be.
Does lime mortar affect where a beam can bear in Borough?
It affects how the bearing is formed. Old brickwork in your Borough building is usually bedded in lime mortar, which is softer than modern cement and will crush under a concentrated load. The engineer specifies a padstone or spreader sized to distribute the end reaction over enough brickwork, and the masonry at the bearing is checked and made good before the beam is set.
Have Borough buildings usually been converted before?
Most have, and often more than once. A building around Borough may have been commercial, then subdivided, then converted again, with openings formed and walls added at each stage. Some of that work predates any record. The engineer inspects what exists rather than working from the original plan, and earlier alterations found to be inadequate are dealt with before new load is added to them.
Is movement monitored during structural work at a Borough property?
Where the building is old or attached to others, it generally is. Recording crack widths and levels at your Borough property before and during the work shows whether anything is actually moving. In a dense area where buildings share walls, that record also matters if a neighbour raises a concern. Where the Party Wall etc. Act applies, the surveyors normally require a schedule of condition.
Who supervises the work day to day at a Borough property?
A named contact from GS Renovation who is on site rather than reachable in theory. Structural work in a Borough building involves several trades, an engineer's design and building control inspections at set stages, and someone has to hold that together. The owner is told who that is and how to reach them before the work starts, along with what happens if a decision is needed quickly.
Does a new rear opening on steel in the Liberty of the Mint Conservation Area need planning?
For a flat, yes: flats have no householder permitted development rights, so a new or wider opening in the elevation normally needs planning permission. The Liberty of the Mint Conservation Area lies broadly to the west and south of Borough Tube Station. For one of the few houses there, check the permitted development position with Southwark. Either way, Southwark's Householder SPD says UPVC will not be permitted in any Conservation Area, even to the rear, so settle the frame material before the engineer fixes the opening width.
Is the building control fee Southwark quotes for a Borough beam the full amount?
No, VAT goes on top. Southwark's final fees and charges schedule lists its building control fees excluding VAT, with VAT added at the time of invoicing or charging. When you compare Southwark's price with a registered building control approver for a steel beam in a Borough flat, compare the two figures on the same basis, both including VAT, so the choice is made on what you will actually pay.
Can a Southwark planning officer look at a Borough building before steel is designed?
Yes, as a paid visit. Southwark's final fees and charges schedule sets a fee for a 1 hour householder enquiry site visit. It suits a beam that carries a change to the outside, such as widening a rear opening or forming new doors to a yard. An officer's view on the elevation, taken before the engineer draws the steel, stops the structure being designed around an opening that planning later narrows.
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