A mansard loft conversion will provide extra space for you to enjoy - but how much does a mansard loft conversion cost? Find out here.
How much does a Mansard Loft Conversion cost?
Average cost in UK: £36k
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The average cost for a mansard loft conversion is £36200. You are likely to spend between £33000 and £45000 total. Exact price may vary depending on your area and project details.
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Mansard Loft Conversion Cost Summary:

  • Price Range = £33,000 to £45,000
  • Average Cost = £36,200
  • Cheapest Price = £33,000

How Much Does a Mansard Loft Conversion Cost?

Making the most of your unused attic space works out as a great investment, for the extra room afforded to you and your family and the added value it gives to the property as well. For many homeowners with standard ‘hipped’ (i.e. sloping) roofs, however, a normal loft conversion can prove to be unsuitable. This is because the diagonally sloping ceiling results in a small volume area and poor amount of headroom; plus hipped roofs aren’t always able to support the beams and joists required in a traditional conversion.  Fortunately, a mansard design gets round all of these awkward design predicaments, giving you the extra room you need as well as helping to maintain the structural integrity of your roof and property.

What is a Mansard Loft Conversion?

Named after the 17th-century French architect Francois Masart (1598-1666), mansard loft conversions basically involve raising the dual-party or gable walls (depending on whether you live in a terraced or detached property) to make a somewhat vertical – at least 72° profile for the mansard. This is then completed with the addition of a horizontal cross section and timber framing. Just think of it as an extension across the entire plane of your roof that maximizes potential space – as though the building came with an additional storey, to begin with.

Fortunately, mansard loft conversions are suitable for detached and semi-detached homes and (unlike hip-to-gable loft conversions) terraced properties, chalets, and bungalows too! This accounts for their increasing popularity in the market – so it’s a good idea to get as many quotes as possible, from a variety of different local and national contractors before signing on the dotted line!

Mansard Loft Conversion Price Comparison

But how much does a loft conversion mansard cost? Well, the loft conversion or price comparison websites list a few different figures to help give potential customers a rough idea of just how much that will need to budget for the project:

  • A Mansard Loft Conversion cost between £33,000 and £45,000

Remember, these quotes should be treated as estimates, as the true cost of a mansard loft conversion will depend on a number of different factors, including the size of your roof and property, how many windows you want and how extensive your renovation proves to be (new beams, a new bathroom or a new boiler to replace an old water tank, for instance, often crop up as surprise refurbishment necessities that few homeowners remember to budget for beforehand).

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