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A Guide to different types of Loft Conversion

Velux, Dormer, Mansard and Raised Gable are common types of loft conversions. In this article, we will look at each type in detail to give you an idea of what is involved, advantages and disadvantages, how much space they could add to your home, and how they would transform the look of your house. 

Roof light (Velux) loft conversion

Roof Light Loft Conversion

Also referred to as a Velux loft conversion since these are the type of windows commonly used in this type of renovation project, Roof Light design is the simplest type of loft conversion. As a result, it’s also the least expensive. It involves simply renovating the pitched roof to add in a couple of skylight windows. The existing structure, and size of the roof itself don’t change.


  • Older houses with high ceilings
  • Retaining the look of the property
  • An en-suite bathroom with a window above the bath for ventilation
  • Avoiding having to apply for planning permission


  • Head space – the pitched roof remains angled
  • Dictating design – the stairs have to be in the centre of the loft

  • Types of Loft Conversions Dormer

    Dormer Loft Conversion

    These extensions were extremely popular decades ago and remain so today - especially in London. They are usually built at the rear of the property and are used for creating additional bedrooms. You’ll find them added to a sloping roof at 90 degrees and in the shape of a rectangle, i.e. they have a flat roof and vertical sides. It’s also possible to have an L-shaped Dormer on the older Victorian and Edwardian style properties with rear extensions.


  • Raising head height so you can choose where the stairs come up
  • All types of properties - terraced, semi-detached and detached homes
  • Less expensive than a Mansard or Hip to Gable loft extension
  • You can get a Juliet balcony added on


  • Its box shape isn’t particularly appealing in an aesthetic sense
  • You will need planning permission for a front dormer
  • Types of Loft Conversions Mansard

    Mansard Loft Conversion 

    The most extensive – and therefore expensive - option, a Mansard extension involves altering the design of the roof by adding a horizontal edge and a vertical straight wall (so that you have three sides to the roof as opposed to the standard two sides). But, unlike a dormer, loft conversion it stands at 70 degrees (rather than 90 degrees) from the existing roof. 


  • Being more sloped it looks better than a dormer
  • Providing the most head room in a conversion
  • Not a lot of structural reinforcement is needed


  • Being the most expensive type of loft conversion
  • Having to get planning permission from the local authority

  • Types of Loft Conversions Hip to Gable

    Hip to Gable Loft Conversion

    With this type of loft conversion, which is also referred to as a ‘raised gable,’ one side of the house (or both) are replaced with a gable wall. In order to achieve this the side of the sloping roof is extended by removing the roof and erecting a triangular vertical wall. The space between the central ridge and the new wall is connected via rafters and tiled over.


  • Their durability - this is a very sturdy type of loft conversion, thanks to its four support rafters or ‘hips’


  • Bungalows, since they may not be able to take the additional weight
  • You’ll have to secure planning permission
  • Being the most complicated loft conversion, it takes longer to design.

  • Loft Conversion Benefits

    As well as the obvious advantage of having an extra bedroom - or two - in your house, a loft conversion will increase the value of your home by twenty per cent on average, and it’s certainly a less stressful way of gaining more space than moving home. 

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    NW9 8UA


    Phone: 0208 200 2327

    About Us

    We are a Design and Build construction company specialised in building new homes, house extensions and loft conversions in North and North West London and Hertfordshire. We cover Notting Hill, Kensington, Maida Vale, Camden Town, Golders Green, Hampstead, Finchley, Hendon, Wembley, Colindale, Mill Hill, Harrow, Barnet, Hadley Wood, Borehamwood, Watford, Welwyn Garden City and St. Albans.