There are several decisions that you will need to answer in order to find a suitable bird house that will fit with what you are wanting for your yard or garden. There are some people who could care less about having bird actually living inside the bird house, but instead they want the bird house to decorate their yard and garden. They use it as an accent piece that will match their house and surrounding environment. While there are also other people on the other end of the spectrum who do not care for a bird house that is decorated in a certain fashion to fit in with their garden. They care more about providing an actual home for the bird to live, and the they care about the shape and wood that the bird house is made out of.
So, the first decision that you will need to make is whether or not you want a decorative bird house or a functional bird house. A decorative bird house will have a general theme that it is built around. An example of a decorative bird house will be is a log cabin bird house. A bird house being a log cabin has no value to the actual bird, and might even make him not want to live inside it. The log cabin bird house is only beneficial to the human who wants it in their garden to look pretty.
The second decision that you will need to make is what type of mounting points do you want the bird house to have. Do you want it to be mounted on a pole that you want stick inside the ground or would you rather have it hang from a rope that you hang underneath your patio? You might not think this is a big deal, but if you do not have anywhere to hang the bird house then you have a major problem if you do not buy a pole mounted bird house.
So in conclusion, you need to pick the type of bird house that you want to put in your yard. Whether you want a decorative one or a functional one that birds will actually enjoy, it is up to you. Do not forget about looking for specific mounting points on the bird house when you go shopping for one. There is nothing worse than getting home and realizing that you need to return the item because you can not use it in your yard.