Birdhouse! Always fun to have some life in the garden during spring time, so the best thing is to put one up early. And in winter other birds may even use it as a place to sleep.
Choice of bird fell on the Great Tit! I like tits...
(ps. i borrowed the pics from somewhere on the net, credit goes to the photographers offcourse)
Step 1: Drawing it all up
For the specific birds ("Great Tit", "Koolmees" or Parus Major) i would like to invite to come and stay over, it's a bottom surface of approx 12cmx12cm. Entrance height should be approx 18cm and entrance itself 32mm. If you want to build one for other birds, do some searching and you'll find the preferred dimensions. Now to be honest, these birds will nest pretty much everywhere apparently.
I made some sketches in MS Word. A notepad and a pencil would probably do as well ;-)
As you can see, i made some wild plans, based on rough assumptions, like width and length of the wood i had. The actual birdhouse came out a little different, but it's pretty close.
Step 2: Off to the shed...
First of all measure, measure again, draw it all up on the wood and get out the saw. I chose the angle of the roof to be 15 degrees. This was easiest for me, since my (powered) saw could also be set to saw at 15 degrees. When it was all sawed out, i sanded everything and did a trail fit with a clamp.