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Rear extension steel lifted over the roof in London
MAH Steel fabricated and supplied the structural steelwork for a residential rear extension in London. Working from the structural engineer’s drawings, we made the steel in our workshop and delivered it with a specialist HIAB crane, lifting it over the existing roof into the rear of the property.
Case study by Nick Steel · Sales Manager Published 22 October 2026
Questions about this project?Speak to Nick Steel, who handled this project.
Project typeResidential structural steelwork for a rear extension, with fabrication and specialist HIAB crane delivery
Services providedStructural steel fabrication, Specialist HIAB crane delivery, Lifting over the existing roof, Coordination with the building contractor
SteelworkUB and UC sections and fabricated structural steel assemblies
Project overview
The delivery was arranged with the building contractor to suit the construction programme, so the building contractor could carry on with the extension works.
Our approach
Design & planning
We began by reviewing the structural engineer’s drawings and confirming the steel sections, fabrication dimensions and connection details.
Fabrication
The steel members and fabricated assemblies were made in our workshop to those drawings and prepared for installation on site.
Delivery & installation
We coordinated the transport and lift with the building contractor. Using a specialist HIAB crane, the fabricated steel was lifted above the existing roof and lowered into the rear of the property, directly where it was needed for the extension works.
Outcome
Fabricated structural steel delivered into the rear extension area by HIAB crane
Steel lifted over the existing roof, avoiding the need for conventional rear access
Delivery arranged around the building contractor’s programme
