In the January 2008 edition of BBC Gardeners World magazine there was a recipe for making your own titbox. I have held on to that issue since then. Just a matter of getting to grips with a ruler, a pencil and a power saw!
I had to make a few alterations to the published dimensions in the magazine. It is obvious that the person writing the magazine had never actually made a box from his own measurements. The front panel and the back panel need to be longer by the amount of the thickness of the wood (in my case 15mm). Just a matter of nailing and glueing the pieces together.
For as long as I could remember as a child, my Dad used to make titboxes with enormous skill and enthusiasm. His domain was his toy shed, full of power saws, hammer drills, boxes of screws and drill bits. I am really a girly girl and prefer to stay in the kitchen!!
So today, I fumbled my way round a Black & Decker jigsaw and a Bosch power drill to make the necessary cuts and holes. By the way... tits must have a hole of no more than one inch and one quarter. For robins and wagtails you can just make the front panel about 2" shorter and they prefer a rectangular opening at the front of the box.