Structural steel support for rear extension of residential property

Structural steel fabricators / construction

The Client

Residential construction specialist

The Brief

Manufacture and install RSJs to support a rear extension in a London-based Victorian town house. The whole of the back of the house was to be removed so we essentially manufactured a huge ‘goal post’ measuring 6m x 3m to hold the house up.

The Challenge

Two challenges for us to meet:

  1. Manufacturing and installing a structure strong enough to support a two storey house
  2. The logistics of getting the RSJs – each weighing 3.5 tons – in place. (Craning the RSJs wasn’t an option given the site was a gated residential area in Chelsea.)

For Challenge 1, we made several site visits, measuring and planning the project together with the structural engineer to ensure we calculated both size and weight requirements precisely. Having satisfied the strength of our structure, we addressed the stability issue back in our Stevenage workshop by welding anti-twist plates onto the RSJs. The brickwork sat on top, and was bolted to, these plates restricting any movement by the steel structure and building combined.

We solved the accessibility challenge by sourcing robust trolleys to ferry each RSJ onto the property before using a block and tackle to hoist them into place.

Regulations & Safety Considerations

  • Manual handling weight limit (20 kilo). We used a variety of techniques to manoeuvre the RSJs into place including block and tackle, lifting equipment, bogie system, skates and rollers
  • Scheduled in major lifting sessions on site, having barriered off the whole area


Planning: 1 month
Manufacture: 2 weeks
Installation: 2 weeks

The Result

Structural steel support for rear extension of residential property 11 1244
Structural steel support for rear extension of residential property 19 1244
Structural steel support for rear extension of residential property 19 1244

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With over 60 years experience, we have built up a reputation of providing high quality products, on time delivery and professionalism.

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