If you live in a conservation area, like all the properties in the picture, the council may not allow you to have a rear dormer, but they will let you have a mansard or a combination of Velux roof windows and small dormers.
Here you will need to submit plans for approval so it pays to use a company that knows all the local planning departments and has experience with each council and what they accept. Because be assured, they are all different.
There are seldom many problems when it comes to getting planning permission and keeping within the rules and some projects, like a Velux conversion, don't need planning permission and don't require an approach to the council at all, though when this is not the case it pays to work with a company that knows what it's doing. We know all the boundaries and how each council approaches planning application - and even how the policy can vary from street to street.
Planning permission normally takes eight weeks once the plans have been submitted and then we can normally start straight away, or as soon as you're ready to get going.