Velux loft conversions are also known as rooflight loft conversions. Velux are the leading manufacturer of roof windows, now with over 60 years experience of making roof windows/lights. With this type of conversion the roof line is unaltered, as the velux windows are installed fitting flush to the roof line, leaving the original roof structure untouched. Therefore, for this type of loft conversion you generally do not need planning permission, which is what makes this type of conversion so different from the other types. Also, due to the fact that no large alterations should be made to the roof, it is likely to help keep the cost of the conversion down.