This article is to summarise the styles of loft conversion typically available in the UK. It will help householders to understand some of the terminology that is used by contractors if they do decide to have their loft converted
Roof Light Conversion
On the outside on a roof light only conversion you will probably just see Velux windows, for this reason alone (except in some designated areas, which you would have to check with your local authority), roof light conversions don’t require planning as they do not change the roof line. The success of such a conversion depends on having enough head height and width in the current loft space to make it useable. Also if you are building to building regulations you will need a fixed stair case so it also depends on the layout on the floor below as the stairs need to finish at a point with a minimum amount of head clearance
Front/Side Dormer Conversion
These can be flat roofed or pitched, if possible we would usually recommend pitched, because it retains the character of the property better, however sometimes this is just not practical. They open out the space better than just a roof light conversion as well. However you will need planning permission for them if they are at the front of the house. At the side it’s different, you don’t need permission for the structure but if the window is overlooking a neighbour you will need permission for anything but obscure glazing.
Gable Extension
This involves raising the “hipped” end of the roof and would be used if there wasn’t enough useable space in the loft. Again no permission is required providing it doesn’t add more than 40m³ to a terraced or 50m³ to a detached or semi detached property, however you will need to check if you are in a designated area.
Wrap Around Extension
This is a very popular option for many semi detached homes as it totally opens up the loft space. It consists of a gable extension, combined with a large flat roof dormer. Again providing you stay within the permitted development allowances and don’t live in a designated area, you will not need planning. However as the trend is often to put a window in the gable end, if you’re overlooking a neighbour, you will need obscure glazing
Mansard Conversion
These are more common in conservation areas and London and are not something you would see regularly in West Yorkshire. They are built with a flat roof and a slightly sloping wall which incorporates small dormers. More commonly seen in conservation areas or when planning is required.
Rear Dormer Conversion
This is a popular style which allows you to open up the space much better than a traditional dormer. This is because purlin’s are removed, the area often strengthened then with steel , and the dormer can be extended right out to the roofline. They would also generally be flat roofed. Again no permission required providing you stick within permitted development limits
