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RSJ and Steel Beam Installation Lewisham

Steel beam installation, RSJ and structural alterations in Lewisham. Trusted, professional, 30+ years' hands-on experience.

GS Renovation installs RSJs and steel beams across Lewisham, from the bay-fronted Victorian terraces of Forest Hill in SE23 to the Edwardian family homes near Blackheath in SE13. With 30+ years of structural experience, we remove load-bearing walls safely, opening up the tight, cellular layouts typical of these period terraces while keeping the house sound.

GS Renovation tradesmen positioning a steel beam beside a propped structural opening on a London rear elevation
Two of the team walk the beam into position by hand before it is lifted and seated onto its padstones.

Removing load-bearing walls in Lewisham terraces

The classic Lewisham job takes out the wall between the front and rear reception rooms, or the wall into the rear closet wing, to make a single open living space. Because these Victorian and Edwardian terraces carry floor and roof loads through those internal walls, a structural engineer sizes the steel beam first. We then set the RSJ onto concrete padstones at each end so the load spreads safely into the remaining brickwork.

Safe sequencing matters on an occupied street in SE4 or SE6. We install temporary props, Acrows and strongboys, to hold the structure above, then carry out staged demolition rather than pulling the wall down in one go. Once the beam is in and bearing correctly, we remove the props, fireproof and box in the steel, and make good. Lewisham Council building control inspects the work and signs it off, giving you the completion certificate you need.

Party wall notices for Lewisham terraces

Terraces in Deptford, New Cross and Catford share a party wall with the house next door, and the chimney breasts and stacks are often built into that shared wall. When your steel beam bears near or into it, the Party Wall etc. Act 1996 usually applies. That means serving formal notice on your neighbour before work starts, typically two months ahead, so the process is agreed and everyone is protected.

We are used to coordinating this across Lewisham's tightly packed streets. Where a chimney breast is removed on a lower floor, the stack above must be properly supported with a gallows bracket or beam, again to the engineer's design. We can recommend a party wall surveyor, prepare the technical drawings your neighbour's side will want to see, and time the notice period so it does not hold up the rest of your build.

  • Party Wall Act 1996 notices and awards handled
  • Bearing checks into party walls and shared masonry
  • Beam boxing, fire protection and plasterboard encasement
  • Making good, plastering and finishing around the new steel
  • Flitch beams where a slimmer steel and timber solution suits
Service areaLewisham · SE4, SE6, SE8 and SE13
Local authorityLewisham Council
Part ofSouth East London (Inner London)
Typical homesVictorian and Edwardian terraces and period family homes
Also covered nearbyGreenwich, Southwark and Bromley

Why Lewisham Homeowners Choose GS Renovation

Lewisham homeowners choose GS Renovation because we handle the whole structural job under one roof, from the engineer's calculations to the propping, the beam and building control sign-off. With 30+ years opening up SE13, SE23 and SE26 terraces, we work cleanly in occupied homes and stand behind every beam we install.

  • Itemised pricing, so you can see what every stage costs
  • One point of contact on the phone, not a call centre
  • Our own trades on site rather than a chain of subcontractors
  • Party Wall Act notices served where a beam bears into a shared wall
  • Levels and deflection checked before the props come out
  • Photographs kept at each stage for your records
30+ YearsFounder's experience
Fully Insured5 year guarantee
4.9 / 531 MyBuilder reviews
Building ControlCompliant
Free QuotesNo obligation
Reviews

Rated 4.9 / 5 by our clients

★★★★★ 4.9 average from 31 verified reviews on MyBuilder

★★★★★
Giorgio is an excellent and intelligent workman, and with very reasonable prices! He installed a kitchen extractor fan in a complicated situation…
Adil KhanWoolwich, London · via MyBuilder
★★★★★
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…
desiree14189Harlow · via MyBuilder
★★★★★
Very friendly and I am very pleased with the work he has done, also very clean worker and enthusiastic about his work. Can not fault this company!!!!…
natalie89391Stevenage · via MyBuilder
Read all 31 reviews

FAQ

Frequently Asked Questions about RSJ and Steel Beam Installation Lewisham

How does your RSJ and steel beam installation price in Lewisham compare with a national firm's?

It compares well, mainly because there is no head office to fund. GS Renovation is the contractor doing the RSJ and steel beam installation work at your SE4 property, not a broker passing a Lewisham job on with a margin added. You deal with the people on site, and the quotation shows the Lewisham Council element rather than an administration fee. Compare the scope, not just the total. Ring 07472 424 226 and GS Renovation will go through the SE4 lines with you. 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.

Does the mixture of housing in Lewisham change how steel is specified?

It changes it substantially. Lewisham contains Victorian terraces, interwar semis, post war houses and blocks of flats, and the floor construction and wall build up differ across all of them. A beam bearing into solid brickwork is a different detail from one bearing into a cavity wall or connecting to a concrete frame. The engineer designs from what the building actually is.

How does a concrete floor affect steelwork in a Lewisham property?

It changes both the propping and the connection. Where your Lewisham property has concrete floors, the load arriving at a new beam is greater than from a timber floor and the temporary support has to suit. Fixing into concrete also differs from building into brickwork, and the engineer specifies the connection detail. None of it is unusual, but none of it is the same as a timber floored terrace.

Can a beam be installed in a Lewisham flat above another home?

Yes, with the design accounting for the floor as shared structure. In your Lewisham flat the floor being cut for a bearing is also the ceiling of the home below, and it provides fire and sound separation for both. The engineer designs the bearing and the trimming accordingly, the separation is reinstated, and the freeholder's licence is obtained alongside building control approval.

What hours can structural work be carried out in a Lewisham flat?

Whatever the lease, the managing agent and the council's rules on construction noise allow, and those are established first. Noisy work in a Lewisham building affects every other home in it, so percussive activity is concentrated into agreed periods rather than spread across the day. Neighbours are told in advance what will happen and roughly when. That costs nothing and prevents most complaints.

What is agreed about waste removal at a Lewisham property?

Who provides it, where it stands and how often it goes. On a Lewisham job a skip on the public highway needs a licence from the highway authority with lighting and markings, while a driveway or forecourt avoids that entirely. Where neither is available, bagged waste on scheduled collections is used instead. The arrangement is settled before the start date rather than on the first morning.

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