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Steel Beams for House Extensions in Sheffield

Wide-span openings, bi-fold door supports, and structural frames for single and double storey extensions across South Yorkshire.

Modern house extensions increasingly feature large openings – wide bi-fold or sliding doors, open plan transitions from existing rooms to new extensions, and expansive window walls. These design features require structural steel to support the loads above the opening safely.

Designed to Build installs steel beams for extensions of all sizes, from simple rear extensions with a single RSJ supporting bi-fold doors, through to complex double storey extensions requiring multiple beams and a full steel frame.

We work closely with structural engineers to ensure every beam is correctly specified for the loads it needs to carry, and we coordinate the steelwork installation with the wider extension build so there are no delays or complications.

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+44 7903 603029

10

Years of Expericence

Building an Extension?

We’ll handle the structural steelwork as part of your extension project. Contact us for a free quote.

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Roof Construction

Roof hen an unknown printer took a galley of type and scrambled itheiro make not

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Commercial , Factory

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Modern Roofing

Roof hen an unknown printer took a galley of type and scrambled itheiro make not

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Modern Roofing

Commercial , Factory , Residential

Renovation Roof

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Renovation Roof

Interior , Residential

Classic Roofing

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Classic Roofing

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Repair Roof

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Repair Roof

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TESTIMONIALS

What People Say About Us

Designed to Build handled the entire structural steelwork for our extension, including calculations, RSJ installation, and finishing. The workmanship was outstanding and the project ran exactly to schedule.”

Sarah Thompson

Sheffield

The team removed our load-bearing wall and installed the steel beam in just two days. Everything was done safely, cleanly, and fully signed off by Building Control. We couldn't be happier with the open-plan layout.”

James Patel

Rotherham

Professional, efficient, and clearly experts at structural work. The steel beam installation was seamless and the team took care of all the compliance paperwork. Highly recommend.

Laura Mitchell

Doncaster

We needed multiple RSJs installed for a complex renovation project. Designed to Build managed the whole process confidently—temporary supports, steel installation, inspections, and making good. Excellent structural specialists.

Michael Green

Hillsborough

Our commercial unit required reinforcement with new steel beams. The team worked around our operating hours and completed the job with minimal disruption. Reliable and highly capable

Karen Doyle

Sheffield
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