Our Guide to Mansard Loft Conversions

Mansard loft conversions provide more space than other types of loft conversion.

Mansard loft conversions are extremely popular of late.  Whilst they require a bit more work compared to other styles of loft conversion, they offer home owners the opportunity to turn an unused attic or loft into a fully functional living space.  Not only that, but they also provide the most room!


HLN Engineering Ltd has years of experience designing mansard loft conversions on behalf of our domestic clients.  What better way to channel this knowledge than a handy mini-guide?  Packed full of useful tit-bits, the following guide will provide you with all the information you need to know on mansard loft conversions.


What is a Mansard Loft Conversion?


Named after the 17th Century French Architect, Francois Mansard, mansard loft conversions are created by removing one side of the roof and raising the height of the party walls on either side of the property. This increases the slope of the roof to around 72 degrees, which in turn creates more vertical space.  In mansard loft conversions, windows are often housed within small dormers, maximising natural light intake.


Mansard loft conversions are suitable for most types of property including:


  • bungalows,
  • chalets,
  • terraced houses,
  • detached and semi-detached houses;


They are most commonly found on properties in densely populated cities such as London.  In such places, where houses are tightly packed, building up is sometimes the only option for home owners longing for some extra living space



Why are Mansard Loft Conversions So Popular?


The popularity of this style of loft conversion stems not only from the added space it provides, but also due to the fact that little structural reinforcement is required.  That said, mansard loft conversions do tend to cost more than Velux, Dormer or hip to cable loft conversions due to the extent of the skilled work necessary.


Ultimately, cost is dependent on the type and size of the building in question.  HLN Engineering Ltd, for instance, will carry out an inspection of your loft space before committing to any design work, to ensure you receive a fair and accurate quotation.

Mansard loft conversions are most suited to terraced houses. As such, they are common in built-up cities such as London.

Mansard loft conversions are most suited to terraced houses. As such, they are common in built-up cities such as London.



How can Mansard Loft Conversions be Utilised?


Mansard loft conversions are versatile and can be used in a number of ways. What was once a dusty, dark storage space can be transformed into a games room, home cinema or additional living room


To be fair, the possibilities are endless and the ideas above were taken from a previous blog ‘loft conversion ideas’.  Be sure to check it out!


Is Planning Permission Required?


Unlike Dormer or Velux loft conversions, planning permission is nearly always required due to the extent of the structural alterations involved.  In some cases, your Mansard loft conversion may be considered as permitted development but it is best to find out beforehand.  Further information will be provided by the local authority.


Beware: in London, changes to the exterior of Georgian and Victorian buildings, two of the most prevalent types of building, is strictly prohibited.  If this is the case, you may wish to consider a rear house extension instead or the possibility of a basement conversion



The Benefits of Mansard Loft Conversions


Whilst there are a few drawbacks, such as the need for planning permission, as-well as the increased costs involved, the pros of opting for a mansard loft conversion nearly always outweigh the cons.


In summary, here are just a few of the benefits mansard loft conversions provide:



  • Increased living space – the largest of the four main types of loft conversion;
  • Easy on the eye – they can also be altered to match the exterior aesthetic of your property;
  • Highly versatile – the possibilities are virtually endless;
  • Added value – a mansard loft conversion will dramatically increase the value of your home;
  • Maximum light intake – more so than any other type of loft conversion



If you’re sold on the idea of a Mansard loft conversion, contact HLN Engineering Ltd today on 020 8099 6388 or email us on mail@hlngroup.co.uk for an initial consultation.

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