You need one day, 5-6 varieties of beer, a package of shingles and some hand tools. With those supplies, you can make yourself a Pallet Children's Playhouse!
Here's how we built our Pallet Children's Playhouse:
To start, we let the pallets define the size to keep it simple. First, we put down bricks as the footing to keep the wood off of the ground. We used three complete pallets to make the walls. The fourth pallet was cut just past the center set of blocks to create a natural doorway. Next, we made the roof by cutting the top decks off of two pallets and mounted them, so they made the classic pyramid shape on top. Finally, we filled in the gaps between the walls and the roof peak by cutting another pallet deck top into two triangle shapes and secured them in place.
We made windows by removing some of the deck boards on the pallets and used the removed boards to create window sills. I applied a layer of plastic over the roof peak to prevent leakage, and it's cheaper than tar paper. Next, we bought a package of fish-scale style shingles and applied them to the roof. The roof peak was covered with a metal corner bracket.
Decorating the Pallet Children's Playhouse:
Finishing touches included a couple of fun, bright, plastic chairs and then I sealed the wood. We added a kid-sized patio area in front of the playhouse, made out of bricks.
We planted a little tree that'll eventually provide some shade (and maybe a few more kid-adventures) in the future. This little corner of our yard seems a little more magical now that it has this little house in it. The hilly part of the yard is held back with a bunch of branches to create a more decorative retaining wall. So far, so good - it's child-approved! :D