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Mansard Loft Conversions in Sheffield

The ultimate loft conversion for maximum space. A mansard conversion transforms your entire roof structure into a full, usable floor with near-vertical walls and flat roof.

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Years of Expericence

What Is a Mansard Loft Conversion?

A mansard loft conversion is the most extensive type of loft conversion available. It involves altering the entire rear (and sometimes front) roof structure to create near-vertical walls (typically at a 72-degree angle) topped with a flat roof. The result is a loft space with the maximum possible headroom and floor area – essentially adding an entirely new storey to your home.

Named after the 17th-century French architect François Mansart, this style of conversion is recognisable by its distinctive almost-flat roof profile with steeply sloping walls below.

Why Choose a Mansard Conversion?

If you want the absolute maximum space from your loft conversion, a mansard is the way to go. Because the walls are near-vertical from floor to ceiling, you lose virtually no usable floor area to sloping ceilings. This makes mansard conversions ideal for creating multiple rooms in the loft – for example, two bedrooms and a bathroom, or a large master suite with walk-in wardrobe and en-suite.

Mansard conversions also tend to add the most value to a property because they effectively create an entire additional floor, making them a strong investment for homeowners in Sheffield’s popular residential areas.

Planning Considerations

Unlike dormer conversions, mansard loft conversions typically require full planning permission because they significantly alter the external appearance of the property. Our team manages the entire planning application process on your behalf, including producing architectural drawings and liaising with Sheffield City Council or your local planning authority.

Want Maximum Space from Your Loft?

A mansard conversion could be the answer. Book a free consultation to discuss your options.

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Factory , Residential

Roof Construction

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Factory , Residential

Roof Construction

Commercial , Factory

Roof Construction

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

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Commercial , Factory

Roof Construction

Commercial , Residential

Modern Roofing

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

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Commercial , Residential

Modern Roofing

Commercial , Factory , Residential

Renovation Roof

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

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Commercial , Factory , Residential

Renovation Roof

Interior , Residential

Classic Roofing

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

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Interior , Residential

Classic Roofing

Interior , Residential

Repair Roof

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

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Interior , Residential

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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