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Mansard Loft Conversion London

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What is a Mansard Loft Conversion?

Mansard loft conversions are amongst the more premium loft conversions you can have carried out in your property. Mansard conversions are similar to dormer conversions in that they’re a box-like extension typically added to the rear of the property. 

Unlike dormers, however, their back walls aren’t vertical, and instead slope inwards slightly, usually at an angle of around 70 degrees. Like dormer conversions, mansards have flat roofs. This type of loft conversion adds both style and elegance to any property, as well as adding that all-valuable space. Something in rare supply in built-up, more urban areas.

Exploring Mansard Loft Conversion Cost (in London)

In terms of cost, mansard loft conversions in London are amongst the most expensive there are. That’s because, unlike basic shell loft conversions, for instance, mansards require significant structural work, including the construction of the mansard itself, which is no small job. Average costs for a mansard conversion will come between £45,000 and £75,000 in total. 

If that seems a large range, it’s worth remembering that there are several variables at play when it comes to mansard conversions. Firstly, the size of the loft itself can vary; smaller properties will, understandably, require less work than larger loft spaces, for instance. Then there’s the question of materials. If you want a more exclusive-feeling mansard loft space, then this will set you back more.

For a more exact price guide on what your mansard loft conversion will cost you, get in touch with our team. With over a decade’s worth of loft extension experience, we’ll provide you with an accurate figure, taking into account everything, including parts, labour and any additional time required – if planning permission applications are likely going to be needed, for instance.

Are There Different Types of Mansard Extensions?

There are several different types of mansard extension available to property owners, including: single mansard extensions, double mansard extensions and l-shaped mansard extensions

Single mansards are the most common and are usually built at the rear of the property. These are typically also the cheapest mansard type to implement. Double mansard extensions involve the construction of mansards on both the rear and the front of a property.

L-shaped mansards involve the construction of two adjoining mansards; one larger and one smaller, to create their distinctive L shape. These are most common on terraced and semi-detached properties which have an extension that already juts out to the rear of a property.

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Frequently Asked Questions (FAQs)

Usually, no. Mansard conversions (or any other loft conversion for that matter) typically fall within a building’s permitted developments. That’s to say, work that can be carried out on a property without needing extra permissions. The conversion will still be subject to building regulations approval, however.

Yes! Implementing any kind of loft conversion will improve your property’s resale value down the line, and mansard conversions, with their luxury feel and aesthetic style, are no exception to this. A mansard conversion which provides an additional (en-suite) bedroom, can expect to add as much as 21% to a property’s overall value, according to a study by Nationwide.