The Ritz Carlton of all birdhouses!! This homemade bird house is a gem-your neighbor's birds will be jealous.  Approx 20"x7.5 and 15" tall. There are 4 separate areas for the birds to move in. You can clean it out easily-just need a screwdriver.  This fits perfectly on a 4x4 post. 

Photo 2 is the bottom that fits over a 4x4 post