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RSJ and Steel Beam Installation Soho

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

GS Renovation installs RSJs and structural steel across Soho and the wider W1 postcode, working in the bay-fronted Victorian and Edwardian terraces that define the area. With over 30 years removing load-bearing walls in Westminster homes, we prop and set every beam to the engineer's sizing correctly, from ground-floor knock-throughs to loft openings.

A GS Renovation tradesman working beneath an installed steel beam, with acrow props still carrying the floor above
Packing and fixing under the seated beam. The props stay in until the bearings are complete and the load is transferred.

Removing load-bearing walls in Soho terraces

Most steel work in Soho's terraces involves opening up the ground floor, taking out the wall between the front reception and the rear closet wing to create one bright, connected space. Our structural engineer calculates the beam size and the padstones it bears onto, then we install temporary props, carry out safe staged demolition and lift the RSJ into position. Every stage is inspected and signed off by Westminster building control.

Because dividing walls and chimney stacks in these W1 terraces usually sit within a shared party wall, the work often triggers the Party Wall Act. We flag this early, so you can serve the correct notices on neighbours before demolition begins. Many Soho homes are also upper-floor apartments or run over several storeys, which means propping and access have to be planned carefully around occupied rooms and narrow period staircases.

Structural steel for Soho knock-throughs

Steel is not just for ground-floor rooms. In Soho we install beams for loft conversions, rear extension openings and chimney breast removals, where taking out the breast on one floor leaves the stack above needing support with a gallows bracket or beam. Each situation is different, so nothing goes in without engineer's calculations. We match the steel to the exact load, whether that is a single lintel or a heavy multi-span beam.

Once the beam is set on its padstones and the props come out, we make good the surrounding structure, fireproof the steel to regulations and hand you the building control completion certificate you will need when you sell. Working in central W1, we keep dust down, protect original cornicing and floors, and coordinate deliveries around the tight streets and parking restrictions that come with Westminster addresses so the job runs smoothly.

  • Goalpost frames where two walls meet at a corner
  • Load-bearing wall removal and knock-throughs
  • Ceiling and floor levels resolved where the beam sits below joists
  • Structural engineer's calculations arranged and followed
  • Steel columns, base plates and bolted connections
Service areaSoho · W1
Local authorityWestminster City Council
Part ofCentral London (Inner London)
Typical homesCharacterful period buildings and upper-floor apartments
Also covered nearbyMarylebone, Mayfair, Pimlico, Belgravia and Paddington

Why Choose GS Renovation in Soho

Homeowners in Soho choose GS Renovation because steel is our core work, not a sideline. One team manages the engineer, the props, the demolition and the building control sign-off, so nothing falls between trades. With over 30 years in W1 and the surrounding Westminster streets, we install beams safely in occupied, characterful period homes.

  • Paperwork and certificates handed over for when you sell
  • Rated 4.9 from 31 reviews on MyBuilder
  • Party Wall Act notices served where a beam bears into a shared wall
  • High-density concrete padstones bedded at every bearing
  • Building control inspected at the propping and beam stages
  • Neighbours given notice before the noisy stages
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

★★★★★
George did a great job on our new bathroom. He is a really friendly and helpful guy and always ready to discuss any issues or concerns and come up…
mre_36Waltham Cross · via MyBuilder
★★★★★
Punctual, worked hard, and did exactly what he was asked and what he said he would do. Overall, a very high quality job. Will use again.
nicholas40451Hertford · via MyBuilder
★★★★★
Built a new extension at rear of property. Laid foundations, drainage, raised floor, new roof and completed all fixtures and interior decoration…
Customer of GSrenovationvia MyBuilder
Read all 31 reviews

FAQ

Frequently Asked Questions about RSJ and Steel Beam Installation Soho

What does the RSJ and steel beam installation quotation for a Soho home cover?

Scope, programme and price, on one document. For a Soho property the RSJ and steel beam installation quotation sets out what is being done, in what order, and what each element costs, including the Westminster City Council building control fee. Exclusions are stated plainly rather than left to be discovered at W1. Homeowners across Westminster get the same format from GS Renovation. Ring 07472 424 226 or email info@gsrenovationltd.co.uk and we will arrange a free survey at the W1 property. 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.

Where does a steel beam bear in a Soho building with vaults under the pavement?

Onto something the engineer has traced the whole way down. Many Soho buildings have cellars and vaults reaching under the footway, so load from a new beam can pass into masonry standing over a void rather than onto solid ground. The engineer follows the load path to its foundation before sizing anything, and where the support below is inadequate the design adds piers or a transfer. Assuming a sound bearing is the common error.

Does a Soho flat above a restaurant need extra fire protection around new steel?

Often, and it is designed rather than assumed. Where a Soho upper floor sits above a kitchen or a bar, the separating floor is doing fire work as well as structural work, and cutting it for a beam breaks that line. The encasement, the fire stopping around the bearings and the reinstatement of the compartment are agreed with building control before the steel is concealed.

How is a beam brought into a Soho building on a restricted street?

By working the route out before the steel is ordered. Parts of Soho are pedestrianised or access restricted for much of the day, and the stairs inside are narrow, so a long beam frequently cannot be brought in whole. The engineer is asked at design stage for a spliced beam arriving in sections, deliveries are booked into the permitted window, and the shared entrance is protected as they come through.

Is the wall shared with the building next door usually involved in Soho beam work?

Very often, because Soho plots are narrow and the buildings sit tight against one another. A beam spanning the width of your Soho room will commonly bear into the wall shared with the neighbouring building, which engages the Party Wall etc. Act. The owner serves notice, an independent surveyor is appointed where the neighbour does not consent, and the bearing is formed to the award.

How is a trading business below told about work in Soho?

In advance, with the noisy stages identified by day rather than in general terms. A business under your Soho flat plans staffing and deliveries around its own trade, and structural work above affects both. Agreeing which days involve propping and cutting, and keeping the shared entrance usable throughout, prevents most of the friction that otherwise arises in a mixed use building.

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