This will allow you to remove the top to clean the bird box out. ... Robins typically require an open-fronted nestbox that should be hidden behind vegetation. The pieces should all fit together without gaps. Hole size for Bluetit box. Bird boxes designed as an integral part of a bird table are unlikely to be occupied. Birdhouse Dimensions Chart. Choosing the right nest box for your finches can be tricky and the ultimate decision is the bird's so here we look at the different options. I was given a bird box for our garden, but I think the hole is too big. Blue Tit. Wild Bird. Here we have a big bird box hole size guide that should be used to help determine what bird requires what size entrance whole. Where two bird species share similar hole size preferences and also breed in the same range, such as the downy woodpecker and the house wren, either bird may use the same house. Nesting birds, such as bluebirds, chickadees, wrens and swallows, are particular about the size of the opening on the front of a birdhouse. Where to position a bird nesting box David ... Nuthatches use nest boxes and even if the hole is the right size they still like to plaster mud around before using it! If you happen to have large breeds such as the Jersey Giant, Brahma, or Cochin, you should use a nest box size for larger chickens – that is, about 14” by 14” and 20” in depth. This is equivalent to 30 cm by 30 cm and 45 cm in depth. If you don't have a large aviary where your bird can fly freely and safely at all times then you will need a cage for it. Also drill 2 x 8mm holes in the bottom of the bird box to allow any water to run out should it drive in through the hole at the front of through any of the joints. Not all birds will use a nesting cavity, but those that will do have preferences for the dimensions of the box and the diameter of the entrance hole. Follow the chart below to determine the proper nest box dimensions for each bird species. Average chicken nesting box dimensions are 12” by 12” and 18” in depth. Nestbox. Fixing the front panel to the bird box. Drill an 8mm hole in the top corners of the back of the bird box. The opening size depends on the type of bluebird in your area, for example, eastern bluebirds require about a 1 1/2-inch diameter opening, while mountain and western bluebirds need an opening of about 1 9/16 inches in diameter. Use the self-tapping screws to fix the top to the sides and the front. Whether you are building a birdhouse or choosing a new one to purchase, the right dimensions and sizes can make all the difference for safe, comfortable housing for your backyard birds. Woodcrete nest box. Close Nuthatches use nest boxes and even if the hole is the right size they still like to plaster mud around before using it! Please check that any plywood you use for your bird boxes comes from FSC (Forest Stewardship Council) sources. Cavity-nesting birds are flexible in their requirements for the preferred size of a birdhouse, but there is more than species preference at stake when planning the appropriate birdhouse dimensions.