Adding a dormer that will enhance the external appearance of your house while providing the additional space you need is a matter of good construction and correct style. There are quite few styles of dormers, as well as the architectural styles for which they are appropriate so caution and some research on the part of home owner are important.Depending upon local regulations and building codes, you may need to obtain approval from a local home-owners association, city planning council or other group before you build. You may need to obtain building permits from your local government and arrange for inspections. You will also need to check on required materials for construction of the frame. The first step in building dormers id determining the precise location in the roof and cutting the necessary holes. The next step will be building the dormer frame. This is a complex process that requires a number of precise framing cuts. Next, the siding and roofing must be installed. Depending upon the style of your home and the materials of which it is built, the siding may be wood, hardy plank, vinyl siding, stone or brick. Installing all components of the roofing felt paper, flashing, and shingles and ensuring that everything is properly sealed will be the next step. Then the appropriate windows will be installed. Finally, the interior work can begin. You will need to install insulation, walls, ceiling and flooring. If you plan to build-in any interior components such as a window seat or a storage area, built-in desk or bookcases, etc., this will be the next step. Then you will be able to paint, wallpaper, lay carpet, etc. and give the room the finishing touches that will make it the functional extra space you need. The end result of building dormers will be a living space in your home that is lighter, brighter, bigger, and more functional.