the design of your shed roof addition. work out the function for the extra space and base things around that. if you design for extra working or study space, you will need a strong roof which will keep water out. if you just want some extra storage space, you can save money using a basic structure and some simple materials. your roof addition should also take into consideration a railing.
there are many common mistakes you can avoid. these will save you a great deal of time and money. remember that you cannot build directly onto the top of a roof. the structure needs extra foundation because it will be too 