The birds aren't too fussy about the houses they live in, but there are some guidelines you should follow if you decide to build your own. The box should be about 8 inches tall and be about 5 inches square. It also helps to put a hinge on the front of the house so you can open up the box for cleaning. Of course, if you don't want to build a bluebird box, you can buy one ready made. Most boxes you buy are built to the right dimensions.
Bluebirds prefer to nest in open, sunny areas where they can swoop in and out to feed their young.
If your backyard doesn't fit this description, find out if you can put up some birdhouses in your local park or on a nearby farm. Just be sure the box is securely mounted to a fence post or pole about 5 to 8 feet above the ground. In the spring, it's a good idea to check your bluebird houses once a week. That way, you can be sure more aggressive birds like house sparrows, wrens, or starlings haven't taken over. If you remove their messy nests on a regular basis, these bird bullies will eventually give up and move to another location.