Building a shed is a DIY project that can be tackled by most people. It's big enough to be tackled in a couple of weekends and the end result is a shed that matches your exact specifications for less that it would cost to buy.
I needed a modestly sized garden shed, mostly for storage (bikes, lawnmower, tools etc.), that would be solid and looked nice. None of the commercially available sheds met the criteria and were within budget so I decided to build my own.