RSJ and Steel Beam Installation New Malden

GS Renovation installs RSJs and steel beams throughout New Malden, where the interwar semis and older terraces of KT3 rely on internal load-bearing walls to carry the floors above. We open up these homes safely, from engineer's calculations to building control sign-off.

In New Malden, 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 New Malden.

How the job runs

1. Free site survey at your New Malden address and an itemised quote.
2. The engineer we appoint sizes the beam, and the work is registered with Kingston 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.

Removing load-bearing walls in New Malden semis

The wall between the front and rear reception rooms of a New Malden interwar semi is almost always load-bearing, carrying floor joists and often part of the chimney breast above. Before any steel goes in, we commission a structural engineer to size the RSJ, specify the padstones it bears onto and confirm the temporary propping needed while the wall comes down in safe, staged sections.

Because many of these houses were built in pairs, the dividing wall with your neighbour is a shared party wall, so beam bearings and chimney breast work often trigger the Party Wall Act. You serve the notices as building owner, with the drawings we supply; we coordinate the propping so the structure is never unsupported and keep the KT3 home stable throughout the demolition and installation.

Housing in New Malden

The Council Tax list puts New Malden at about 7,070 homes, 31% flats against 69% houses; 33% went up before 1919, 33% between the wars and 34% after 1945. 31% of homes here are semi-detached; a beam bearing on the shared wall of a semi in New Malden means one party wall notice.

Timing a New Malden steel around Kingston's inspection days

After Kingston validates a building control application it sends a Service Plan, a list of the stages at which site inspections must be booked. On an RSJ in New Malden, the stage we plan hardest around is the steel sitting on its padstones with the props still in. Kingston's officers attend Monday to Friday, except public holidays, typically between 9.30am and 3pm. So we lift the steel early in the week and early in the day. A beam seated on a Friday afternoon can leave the house standing on props until Monday, and a bank holiday weekend stretches that further. We keep the ceiling below open and the bearings bare until the officer has seen them.

The bearing itself changes from street to street. In New Malden 33% of homes were built before 1919, and much of that older stock is the Victorian housing near the station. A beam end in brickwork of that age can meet soft bricks bedded in lime mortar. The structural engineer we appoint may then ask for the pocket to be cut back to sound masonry, or for a longer padstone to spread the load. Tell us the age of the house when you first call, because it changes what we look at on the survey visit: the brick at each end of the proposed opening, not only the wall in the middle.

Padstones, propping and sign-off in KT3

Every steel we fit lands on a properly designed bearing. The engineer calculates the padstone size so the concentrated load from the RSJ spreads safely into the interwar brickwork, which on New Malden homes is usually solid or early cavity construction. We build in the padstones, seat and level the beam, then pack and pin the wall above so the floors settle back onto the new steel without cracking the plaster.

Kingston Council building control inspects the works at key stages, and we book those inspections so the beam is checked before it is boxed in. You receive the completion certificate that confirms the structural alteration meets the Building Regulations, which matters when you eventually sell your KT3 property and a buyer's solicitor asks for the paperwork.

Who turns up, and on which day

A steel beam is not a one-trade job, and knowing who is coming makes it far easier to live with. In a New Malden semi the first days are our own team, protecting the house, isolating services and setting up propping. An electrician and a plumber follow to divert anything in the wall, then the demolition and the steelwork are ours again, with a delivery slot booked for the beam itself. Access for the beam is booked in advance, because a steel delivery cannot simply be left on the pavement.

After building control has seen the bearings, the plasterer works on the opening and the ceiling line, and the decorator comes last once everything has dried. All of it is coordinated by us, so you have one number to call rather than chasing separate trades. We tell you at the start which days are noisy, which days need the water off, and which days nobody is on site because something is curing.

• Steel columns, base plates and bolted connections
• Access and lifting plans for restricted terraced and town-centre sites
• RSJ and structural steel beam installation

VOA Council Tax stock of properties, March 2025, for New Malden East and New Malden West. Counts rounded by the VOA.

Next steps that tend to follow RSJ and steel beam installation in New Malden: home renovation in New Malden, RSJ and steel beam installation across Kingston upon Thames, London builders who fit steel, the Party Wall Act when a beam bears on a shared wall, RSJ and steel beam installation anywhere in London and Cracks in Walls: When to Worry.

Why Choose GS Renovation in New Malden

New Malden homeowners choose GS Renovation because we treat steelwork as structural engineering, not guesswork. We appoint the engineer your house needs and manage the temporary propping and the building control inspections. With our founder's 30+ years on the tools, we open up interwar homes cleanly and hand you the certificates that prove it was done right.

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.