Mansard Loft Conversions

Mansard loft conversions provide the largest rooms and simplest interiors. To create this conversion, our team must drastically alter the shape of your roof so that it was 4 sides rather than 3; while the cross-section of a roof is usually triangular, Mansard loft conversions involve opening up one side of the roof and adding a roof and a sloping front wall to change the cross-section to a quadrilateral. The roof is built at between 72 and 90 degrees, making these loft conversions much easier to furnish since there are more vertical (or almost vertical) walls.

Double Mansard Conversions

If you would like to maximise the space in your loft conversion, a Double Mansard essentially adds a new storey to your home – these loft conversions are similar to standard Mansard conversions, but there are two Mansards (one at the front, and one at the back).

It can be difficult to gain planning permission for these loft conversions since the exterior alterations are quite extreme, but our architectural partners have extensive experience throughout London and will handle the planning permission process on your behalf. Double Mansard loft conversions have been completed throughout Fulham, Clapham, and Wimbledon.



Although Mansard conversions almost always require planning consent (which extends the timeframes for the project), they do produce airy, spacious rooms that rarely feel like a loft conversion. Your new rooms will be simpler to furnish, with more usable floor space than a Velux or a Dormer loft conversion.

Previous clients have used these spaces as additional lounges, gyms, home cinemas, and even artist studios as well as bedrooms and bathrooms. The size and shape of the rooms makes these conversions incredibly versatile. If you would like to discuss a Mansard loft conversion or find out whether it’s suitable for you, please get in touch to make an appointment.

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Case Studies

Loft Conversions Add a Fifth to Property Values

Loft conversions are one of the best ways to make your home more spacious – an intelligently-designed conversion can add as much as 30% more living space to your home without extending the footprint of your house. As with all home improvements, conversions also increase the value and sale-ability of your home. A study by […]

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The client wanted to make extensive improvements to her home in Wandsworth, including a loft conversion, a kitchen extension, and alterations to her existing lounge and one of the existing bedrooms. All of the work took around 12 weeks and they were extremely happy with the results.  


Avian Construction Ltd

Peterden House
1A Leighton Rd
West Ealing
W13 9EL

020 3174 1241