RSJ and Steel Beam Installation Bexley

GS Renovation installs RSJs and steel beams across Bexley, from the 1930s semi-detached houses of Bexleyheath and Welling to the interwar family homes around Sidcup. We open up load-bearing walls safely, with engineer-sized steel and full building control sign-off.

In Bexley, 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 Bexley.

How the job runs

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

The dividing wall between the front and back reception rooms in a Bexley 1930s semi is almost always load-bearing, carrying the floor joists and often a chimney breast above. To remove it we bring in a structural engineer to size the RSJ, set temporary props to take the load, then carry out staged demolition. The new beam bears onto concrete padstones at each end, spreading the weight safely down through the existing brickwork.

Because so many houses across DA6 and DA7 are semi-detached, one end of the beam frequently lands in the party wall shared with next door. That triggers the Party Wall Act, so you serve the correct notices on your neighbour as building owner before any cutting begins, using the drawings we supply. Bexley Council building control inspects the steelwork and its bearings, and we arrange the completion certificate you will need when you eventually sell the house.

Housing in Bexley

Bexley's housing, as the Council Tax list records it, is about 101,760 homes: 73% houses, 27% flats, with 11% pre-1919, 41% interwar and 48% built since 1945. Semi-detached houses make up 36% of homes here, and a beam bearing on the shared wall of a semi in Bexley means one party wall notice.

Ordering the steel around Bexley's full plans check

In Bexley, 41% of homes were built between 1919 and 1939, and a familiar beam job in those houses replaces the spine wall between the two reception rooms. On the full plans route, a Bexley application generally needs a construction specification and, where applicable, structural calculations for steel beams. So the structural engineer we appoint finishes the calculations before anything is submitted, not after the wall is opened. Bexley formally checks full plans submissions and issues a decision within five to eight weeks. Order the steel once the approved section and padstone sizes are known, because a beam bought before the plan check may turn out to be one size too small.

The other route is a building notice, and in Bexley a building notice does not include formal approval of the plans. Building control has not checked the beam size before the props go up; the inspector judges the steel, the bearings and the padstones on site, with the wall already out. For a short opening with sound brick piers either side, that risk is small. For a long span, a beam landing on an old opening, or a goalpost frame, full plans moves the check to the drawing stage, where a change means a revised drawing rather than a second delivery. Settle the route with the engineer before you fix a start date in Bexley.

Steel beams for Bexley through-lounges

A popular project in Welling and Bexleyheath is joining the two separate reception rooms into a single through-lounge. The party wall between the semi and its neighbour stays put, but the internal spine wall comes out and a steel beam takes its place. We set up the propping, protect the rest of the house from dust, and thread the beam in without disturbing the floors above or the roof structure over the room.

Larger interwar houses on the generous plots around Danson Park sometimes need a pair of beams, or a goalpost frame where two directions of load meet. Whatever the arrangement, the engineer's calculations set the steel size, the padstone dimensions and the connection details. We handle delivery of heavy sections into tight suburban driveways, the make-good plastering afterwards, and the building control inspection at every critical stage of the job.

Delivering and lifting steel on suburban plots

A wide interwar ground floor needs a substantial beam, and its weight is a practical problem long before it is a structural one. Where the span is long, the engineer may specify two lighter sections bolted together in place rather than one heavy member, simply because a single beam could not be carried into the room. On a Bexley semi with a driveway and a side gate the access is usually better than a terrace, so steel can come in down the side of the house.

We lift by hand where the weight allows and use lifting gear where it does not, working the beam up onto its padstones with the props still carrying the floor above. Steel arrives cut to length with plates and bolt holes already done, since drilling and welding in a finished house is neither quick nor clean. Delivery is booked for the morning of demolition day so a long lorry is not parked across a DA6 close any longer than it needs to be.

• Lintel and catnic support to smaller openings
• Beam boxing, fire protection and plasterboard encasement
• Steel delivered cut, drilled and primed to the engineer's schedule

VOA Council Tax stock of properties, March 2025, for all 28 statistical areas in Bexley. Counts rounded by the VOA.

Before committing to RSJ and steel beam installation in Bexley, it is worth looking at home renovation in Bexley, our Bexley area guide, London builders who fit steel, the Party Wall Act when a beam bears on a shared wall, how we handle RSJ and steel beam installation across London and Cracks in Walls: When to Worry.

The GS Renovation Difference in Bexley

Bexley homeowners choose GS Renovation because we treat structural work as the serious job it is. One team manages the engineer, the propping, the steel and the building control inspections, so nothing falls between trades. With our founder's 30+ years on the tools, we keep your home safe, tidy and properly certificated from first prop to final sign-off.

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.