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Mansard Loft Conversion Specialists London

What is a Mansard Loft Conversion?

A Mansard Loft Conversion was originally conceived by French architect Francois Masart in the 17th Century. His space-creating design has been adapted over the years, but essentially remains true to the original idea, producing an extension that sits across the entire plane of the roof.

Applicable only to pitched roofs, the Mansard style essentially works by creating an almost vertical-looking profile to one side of the slope (usually the rear side), raising the wall to an angle of at least 72 degrees and flattening the top of the roof.

In terraced or semi-detached properties, the side that is altered will often be the dual-party wall and may require cooperation from the neighbour or owner of this connecting partition. For detached houses, it will generally be the gable wall that is raised.

Mansard Loft Conversion Outside

Benefits of a Mansard Conversion

The most obvious benefit of a Mansard conversion is all that extra space it provides. By raising one of the pitched sides, the attic space is immediately transformed into a spacious living area – almost as if the property had an extra room to begin with.

Not only does this present the opportunity to create a guest bedroom, spare bathroom, home office or leisure area, it also potentially gives the value of your house a huge boost.

The nature of the Mansard conversion means that, unlike hip-to-gable extensions, they are suitable for terraced housing as well as detached and semi-detached properties. Unsurprisingly, this makes Mansard conversion one of the most popular on the market, so obtaining a competitive quote from a loft conversion company should be easier than for other types.

Advantages of Mansard Loft Conversions

To summarise, some of the advantages of mansard loft conversions include:

  • They are appropriate for several different types of property.
  • It maximises the roof space of your current property.
  • It can be built and finished in many ways in order to match the existing building style.

Some of the disadvantages include:

  • It is often more costly compared to other types of loft conversion.
  • You are highly likely to require planning permission.
  • It requires a good deal of construction work – hence the additional cost.


If you want to know more about the service we can provide or you would like more information about Mansard Loft Conversions then please don’t hesitate to get in touch or send us an email and we will get back to you as soon as possible.


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