Pallet Playhouse  Here's a fun project that won't cost you too much. It's made from shipping pallets, scrap wood and a clever, funky design. You can follow the illustrated, step-by-step building guide at instructables.com

 

Backyard Teepee  This mini teepee is perfect for any kid's next backyard powwow. Free plans and building instructions are offered by DIY Network.

 

DIY Plans for Playhouses, Treehouses and Play Forts from Buildeazy.com  Find quality online plans that use can use to help you build playhouses, play forts, tree houses and childrens' furniture.

 

Raised Platform Playhouse Plans by Ana White  Here's a simple playhouse that you can build from one sheet of plywood and that has an optional raised deck. You'll find complete, online do-it-yourself plans, a materials list and step-by-step instructions at Ana-White.com. And, you'll also find dozens more outdoor and indoor project plans that you and your kids will love.

 

Two Story Fort Playhouse  Here's a two floor Fort Playhouse that you can build with step by step building directions.