Building a treehouse is mostly an exercise in carpentry. But even if you have years of experience pounding nails and planing doors with your feet firmly on the ground, you’ll find that everything changes once you’re up in the air. The simplest tasks take on new challenges as you struggle to keep the counterforces of work from knocking you to the ground. But in the end, whether you’re building a treehouse or an outhouse or a doghouse, the success of the project comes down to good design and sound techniques. We’ve discussed good design already. Now it’s time to take a look at treehouse building techniques.