Steel beam installation, RSJ and structural alterations in Amersham. Trusted, professional, 30+ years' hands-on experience.
A steel beam is only as sound as what it bears on, and Amersham gives two different answers. Timber framing survives in the High Street of the Old Town. In Elm Close, up the hill, the houses are built of concrete blocks. We appoint the structural engineer, build to the calculations, and coordinate the building control inspections.

The bearing detail follows the wall the steel lands on, and Amersham has two building traditions. The council's Old Town appraisal records that timber framing survives in the High Street and becomes more predominant towards the 17th century Market Hall, the King's Arms Hotel being its own example. Landing a beam in a frame like that is a different exercise from landing one in brickwork.
In Elm Close the council's appraisal describes houses two storeys high, constructed of pale grey and brown concrete blocks with brown tiled roofs. It puts the use of concrete blocks down to the shortage of building materials in the early interwar period. Blockwork changes the padstone and bearing design. Your engineer sizes it, and we build to what is specified.
A garage conversion needs a beam where the garage door was, and on the Weller Estate the council has said what should happen around it. Its appraisal asks that any new windows in a converted integral garage are in keeping with those originally used, and that a wall replacing the garage doors is rendered to match the rest of the house. Settle that finish before the opening is formed, not after.
Buckinghamshire Council states that structural or architectural drawings and calculations must be submitted with a full plans building control application. We never produce those calculations. We appoint a structural engineer to prepare them, coordinate the application and the inspections, and build the beam, padstones and connections to what the engineer has specified.
Cost follows the span and what sits above it. As a guide, indicative London ranges, MyBuilder and Checkatrade, 2026, put an RSJ beam alone for one straightforward opening at £1,500 to £4,000. A quotation for your own opening is free and carries no obligation.
Because the beam is not the decision. The structural engineer's calculation is, and we are the contractor who appoints that engineer, reads the drawing, and builds the bearings, padstones and connections exactly as specified. We never produce calculations ourselves. What we do is run the job around them, coordinate the Buckinghamshire Council inspections, and give you one point of contact. Fully insured, with free no obligation quotations.
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FAQ
The honest answer is that the risk sits in what is concealed. GS Renovation lists what the HP6 survey could not inspect, so an Amersham homeowner knows where the RSJ and steel beam installation figure might move before signing anything. The Buckinghamshire Council fee and the engineer's fee are already included rather than sprung later. Nothing is added to the Amersham account without your written agreement. Ring 07472 424 226 if you want the HP6 risks explained before quoting. 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.
Yes, because a post concentrates the load into a base instead of spreading it along a wall. The British Geological Survey maps patches of Made Ground and Worked Ground at points across Amersham, including the railway corridor by the station and at Whielden Street, and Clay-with-flints over chalk across Amersham-on-the-Hill. Your engineer specifies the base once the ground is opened up, and we dig and pour to that specification.
They can be kept. The council's appraisal records decorative blocks at first floor level on the Elm Close front elevations, with some houses carrying their completion dates in that position. The houses are built of pale grey and brown concrete blocks, so a beam bearing near that elevation is set out to leave the visible blockwork intact. Where a block has to come out, it is recorded, retained and reinstated in the same position.
It can, because listed building consent covers internal work affecting a building's special interest, not only what shows outside. The council's leaflet for the Amersham Old Town Conservation Area records 151 listed buildings within it, and the appraisal notes that timber framing survives in the High Street. Buckinghamshire Council confirms the listing for your address. We coordinate the building control side and build to whatever consent the design is granted.
Work stops at that point and the engineer returns to inspect. The design is revised, and the revised drawings and calculations go to Buckinghamshire Council, which requires structural or architectural drawings and calculations with a full plans application. Nothing is ordered or built to a superseded design. We hold the engineer's appointment, so chasing the revision is our job rather than yours.
Yes. A steel beam is encased so it achieves the fire resistance the regulations ask of it, and the encasement goes on after the beam has been inspected, not before. Buckinghamshire Council requires a full plans application for extensive internal structural alterations, and inspections are called in as the work reaches each stage. We book them, attend them, and only then close the beam in and plaster.
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Free, no-obligation quote for RSJ and steel beam installation in Amersham. Rated 4.9 from 31 reviews on MyBuilder, fully insured, and building control handled for you.