Kieran McCarthy: What natural light options do I have for my attic?

There are pros and cons to choosing a rooflight over a dormer window, writes Kieran McCarthy

Dormer windows transform an attic as they raise the ceiling locally and provide a really usable space in terms of functionality and value.

Hi Kieran, I am considering converting my attic but before I speak to a builder or carpenter I’d like to get your views on what is involved in adding a dormer window. 

I believe standard skylights are fine but my partner thinks it would be better to add a larger dormer window to give more space and light. Is there a significant additional cost and does it require planning permission?