What Size Hole For A Bird Box

For starlings and great spotted woodpeckers use the dimensions for the large box. Bird box hole size guide attracting common wild birds to nest in your bird nesting box would depend highly on not just where its sited but the size and shape of the entrance hole.

Nesting Box

The recommended hole size of the birdhouse for these birds is 8 inches in diameter and the height of the hole should be 23 inches above the floor of the bird house.

What size hole for a bird box. As starlings are slightly larger birds the nestbox hole would ideally be approximately 45mm. If its less young birds might fall out or be scooped out by a cat. Small common garden birds like blue coal and marsh tits require a 25mm hole well a great tit swift house and tree sparrow need a 28mm hole.

I have so far seen gold finches blue tits great tits a robin or two and a few other smallish birds. The main entrance hole for the adults is 1 12 and the other three for the chicks are each 1 in diameter. The chickadee prefers 1 18 inch diameter openings the titmouse bewicks wren and the downy woodpecker look for homes with 1 14 inch diameter openings.

Is this too big or does it give it a better chance of someone living in it. I was given a bird box for our garden but i think the hole is too big. Furthermore the dimensions of the birdhouse floor should be 14 x 14 inches and the total height of the birdhouse should be 26 inches.

Wrens will use a house that has an entry hole dimension of 1 18 inches any larger and house sparrows and other less desirable birds will use them. I typically place my perch approximately the same distance below the entrance hole as the size of the entrance hole. All the others need the small one.

The floor should be 4 inches square and 3 6 inches below the entry hole. This nest box should be at least 10 long and at least 7 wide with the backboard at least 6 high and the front board 8 or 9 high. Many wild birds prefer entrance holes that range between 1 and 1 12 inches in diameter.

The bottom of the entrance hole must be at least 125 mm from the floor of the nestbox. Looking at the average sizes for the entrance hole ours is to large at 40mm. American kestrel 3 inches 76 cm.

For example if the entrance hole is 15 i will place the perch 15 below the entrance hole. Different individuals of the same bird species may vary slightly in size but that variation is so small that birdhouse hole sizes can be made to standard dimensions without difficulty. These basic entrance sizes can help attract just the types of birds you want to become backyard residents.

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