The author built a backyard office using a Tuff Shed frame, with a total cost of under $20,000. The office is 8 feet by 10 feet, with large windows, a skylight, and a mini-split HVAC system. The author is happy with the result, which provides a quiet and separate workspace. The project was completed within the planned budget, with some cost-saving measures such as installing windows and Ethernet cable personally.