Build a 8x8 playhouse with an optional porch area and flower boxes. The deck is 6" off the ground and the roof is roughly 10 feet tall. This is a guidebook to construct this fort with diagrams and instructions. Cost: The price for the materials to build this project would be dependent upon what material that you purchase. Some lumber is more expensive than others. However, the original structure was created with standard pine so the general cost would be around $600, which would include hardware. Time: I am not going to waste your time to estimate how long it will take you to assemble this fort. Every person has a different speed and it depends on your tools and expertise, obviously. As well as how much free time that is available to you. Theoretically, it could be completed in one day. Also theoretically, it could take you a week. If you hire some of the contractors that I've heard complained about, it could take them a whole year.