RSJ and Steel Beam Installation Kennington

GS Renovation installs steel beams and RSJs across Kennington, from the Georgian and Regency townhouses around Cleaver Square and Kennington Road to the Victorian terraces towards Vauxhall. We open up load-bearing walls safely, working around the listed status and conservation constraints common to these period homes.

In Kennington, 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 Kennington.

How the job runs

1. Free site survey at your Kennington address and an itemised quote.
2. The engineer we appoint sizes the beam, and the work is registered with Lambeth Council building control or an approved inspector. On a shared wall you serve the party wall notice as building owner; we supply the drawings.
3. Props go in, the opening is cut and the beam is set on padstones, packed tight above.
4. Building control inspects the steel before it is covered. We make good, and the completion certificate follows.

Load-bearing walls in Kennington townhouses

Kennington's Georgian and Regency townhouses were built with solid masonry walls, and the dividing wall between the two ground-floor reception rooms is almost always load-bearing, carrying floors and often a chimney stack above. Before any demolition, we have a structural engineer calculate and specify the correct RSJ or steel beam, along with the padstones it bears onto. This is building regulations work, signed off by Lambeth building control, not planning permission for the internal structure.

On site we install temporary propping first, then remove the masonry in safe, staged sections so nothing above is left unsupported. The steel is craned or manoeuvred into position within these tight SE11 plots, seated on its padstones and packed tight, then encased for fire protection. We keep the house watertight and secure throughout, because most Kennington owners stay in the property while the work goes ahead.

Housing in Kennington

Take the 8,500 or so homes the valuation list gives Kennington: 82% flats, 18% houses, 28% from before 1919, 12% interwar and 60% post-war. Most homes here are flats, and a beam in a leasehold flat in Kennington needs the freeholder's licence for alterations, since the lease usually keeps the structure with the freeholder.

A beam over new garden doors in a Kennington terrace

Lambeth's Kennington conservation area (CA 08), first designated in 1968, is characterised by smart terraced housing, and 16% of Kennington's homes are terraced houses. Inside one of those houses a new RSJ between rooms is a building regulations matter. The job changes when the steel goes over a widened opening in the back wall, for garden doors, because the outside of the house changes too. The Kennington Conservation Area Statement says no buildings within it are subject to an Article 4 Direction, so the question is not an extra direction but whether the house is listed and what the ordinary rules allow.

Settle that before the engineer sizes anything, because the width of the opening sets the beam and the beam sets the padstones. A rear opening in a terrace often means one bearing lands near the party wall and the other in a short pier of old brick between the new doors and the rear return. The structural engineer we appoint checks whether that pier can carry the concentrated load or needs rebuilding. That answer decides the programme, since rebuilding a pier means more propping, more days with the back of the house open and a longer wait before the doors can be fitted.

Party wall duties on Kennington terraces

Many Kennington homes share a party wall with the neighbour, and chimney breasts and dividing walls frequently sit within that shared structure. Where a beam bears into a party wall, or you cut into it, the Party Wall Act applies and you, as building owner, or your surveyor serve formal notice on the adjoining owner. We flag this early, give you the drawings the notice needs and time the works so the notice and any award are in place before the steel goes in, avoiding disputes with neighbours.

Because a good number of these townhouses are listed or fall within a Lambeth conservation area, we stay mindful of original cornicing, ceiling roses and joinery around the opening. Where a period feature can be retained or carefully reinstated, we do so, and we make good the plaster and floors so the finished opening reads as though the beam was always part of the room rather than an afterthought.

Who is responsible for what on site

It is worth being clear about the split of duties, because it protects you. The structural engineer is the designer. They survey the property, establish the loads, size the beam and the padstones, specify the bearings and the temporary works, and issue the drawing and calculations. We appoint them, brief them and give them access, but we do not produce structural calculations ourselves and we would not want a contractor who did.

We are the builder. Our job is to construct exactly what the engineer has designed, in the right sequence, with the right propping, and to have it inspected at the stages Lambeth building control requires. If the structure turns out to differ from the assumptions, the engineer is called back to revise the design before we go further. That separation is why the paperwork at the end stands up, and why nobody is marking their own homework on a wall that holds a house up.

• Lintel and catnic support to smaller openings
• Access and lifting plans for restricted terraced and town-centre sites
• Steel delivered cut, drilled and primed to the engineer's schedule

VOA Council Tax stock of properties, March 2025, for Lambeth Walk & North Kennington and Oval. Counts rounded by the VOA.

Once the RSJ and steel beam installation work in Kennington is scoped, people usually go on to read home renovation in Kennington, RSJ and steel beam installation across Lambeth, building control sign-off for a steel beam, party walls and steel beams, how we handle RSJ and steel beam installation across London and Building Regulations Explained.

Why Kennington Homeowners Choose GS Renovation

Kennington homeowners choose GS Renovation because we treat steelwork in period, often listed property as a structural discipline, not a quick knock-through. Engineer-designed beams, correct padstones, staged propping, party wall coordination and Lambeth building control sign-off are all handled by one team with our founder's 30+ years on the tools behind it, working tidily in your occupied SE11 home.

Checked by Abdelaaziz Saaid, founder and director of GS Renovation Ltd (Companies House no. 14611254). Structural design is by the consulting engineer appointed to your project.