Birds are instinctive, and this determines what they look for in a home, whether already existing or built from the branch up, as well as what features will be necessary. Thus, the birdhouse should adequately address location preference, size, bird nesting habits, raising and protection of young, protection from elements and predators, perching habits, feeding habits, to name just a few parameters you will need to know and understand. In addition, birds are by nature environmental designers and builders. They use readily available materials, often salvaged, and undoubtedly take into consideration durability and efficient use of materials. After all, if the nest fails, guess who has to rebuild it. 

There may be opportunities to consider other functions the house could serve for the bird species, beyond just housing. Take this into consideration in your design, as well as determine whether or not it is appropriate to the species of choice. It could end up being a pricey and ill-used add-on. Birds may be interested in style as well, so feel free to incorporate stylistic attributes into the birdhouse design as well. In short, know your client –each bird species is unique in what it looks for in a home, just as we are when we shop for or build a home. Finally, the purpose of this project is to promote critical research and evaluation skills, necessary for any successful sustainable building project.