Basically it has to be an upright rectangular box with a roof on top installed at a 45 degree angle. The hole should be as close to the top as possible to provide bluebirds the deep cavity they are looking for and some protection above the entrance. Installing hinges to secure the roof top instead of nails is a great idea to make the house easier to clean. It is important to remove any debris in the spring from the previous occupants otherwise new ones wont build their nest into it.
Another consideration in choosing a bird house is where you want to place it. If you plan to attach it to an existing tree, then it is better to choose the small one. On the contrary, you can choose a big one if you plan to have a stand alone bird house instead.
Because each species has its own needs and requirements for living, many bird house plans will be specifically designed for that species only. Plans for two different species could overlap a bit, meaning you might be able to use a plan designed for several species of small birds, while also being able to use a plan designed for several species of larger birds.
As you scan through the available projects, you will probably notice that most bird house plans have a similar design. A square or rectangular base, a sloping roof and hinged access point either in the top, sides or front. The size of the house that you choose should be driven either by the type of bird you are attempting to attract or the birds that frequent your area. A general rule is if you are trying to attract small birds then a smaller house is preferable. If it is larger species you are after then the size of the house will increase. Before searching for your nesting box plans, ensure that you have done a small amount of research on the bird life that frequent your area.
Make small cuts on all four corners of the floor to act as drainage holes. The back wall will be taller than the front wall so that the roof slants to also provide for drainage along with a slight overhang. You will also attach the side walls to the front and back panels so that there is a 1/4 inch space at the top for ventilation.
Once you decide you want to build a bird house, you’ll need to get a set of bird house plans. A general set of plans will be useful if you want to the same style house for different types of birds, as each species has its own unique requirements for the bird house size. You can find several websites that have these types of plans, along with detailed building instructions. The plans will show you what pieces you will need to cut and the dimensions of those pieces for the particular type of bird you are building for.
After making your all your cuts, you will then use galvanized nails to put it together. Do not use nails that are not intended for outdoor use and will rust. One side door will have two nails attached at the top through the front and back walls so that it can pivot for opening and closing the door for nest monitoring and cleaning. You will also want to make some kind of latch at the bottom of this door so that it can be secured and not easily opened.
Choose the right bluebird house plans and follow these guidelines for material use, placement and predator prevention and soon you will be enjoying the bluebird life cycle in your backyard too.