If you have a cill built into the brick wall eg a masonary cill, then it would be normal to fit windows without a projecting cill. Where there is a flat opening for the window then a window with a projecting cill should be fitted with the cill sticking outside the opening.
DIY how to tutorial projects and guides - Did you know we have a DIY Projects section? Well, if no, then we certainly do! Within this area of our site have literally hundreds of how-to guides and tutorials that cover a huge range of home improvement tasks. Each page also comes with pictures and a video to make completing those jobs even easier!