When people look at having extensions built there is a lot to consider. The primary consideration will of course be what is the purpose of the space. If it is to be used as a sleeping you might choose to extend up in the roof. If you are wanting to have a bigger living space, you might choose to extend onto the back or side of your house. In either case, windows are going to be an important consideration in order to ensure you get enough light into the space.
VELUX roof windows end up being a popular choice. And it is easy to see why. These days, they are much more than simply the skylights of years gone by, with different configurations available according to your needs. The classic choice is of course the centre-pivot window. The top-hung window is a good choice for those windows that are easily accessible. And the automated roof window will be a good choice for those high ceilings.
A VELUX roof window on an extension will bring in lots of natural light. There are also a number of different VELUX blinds available which will help you to create the right atmosphere indoors. With a ten year guarantee on all windows and flashings, you would be hard pushed to find better quality elsewhere.
Disclosure: This is a collaborative post.