Bird houses critical dimensions, by species

SPECIES FLOOR (IN) HEIGHT (IN) HOLE DIAMETER (IN) HOLE ABOVE FLOOR (IN) BOX ABOVE GROUND (FT)
Chickadees
Chickadees& Tits 4×4 6-10 1 1/8 4-8 6-15
Titmouse 4×4 6-12 1 1/4 4-10 6-15
Ducks
Wood Duck 10×18 10-24 4 12-16 6-20
Flycatchers
Ash-Throated 6×6 8-12 1 1/2 6-10 5-15
Great Crested 6×6 8-12 1 3/4 6-10 5-15
Falcons
American Kestrel 8×8 12-15 3 9-12 8-30
Hawks/Buteos
Red-tailed Hawk* 24×24 platform at least 14
Nuthatches
Brown-headed, Pygmy & Red-breasted 4×4 8-10 1 1/4 6-8 5-15
White Breasted 4×4 8-10 1 3/8 6-8 5-15
Ospreys
Osprey* 48×48 platform at least 15 over water**
Owls
Barn 10×18 15-18 6 4 12-18
Great Horned Owl* 24×24 platform
Screech 8×8 12-15 3 9-12 8-30
Phoebes
Phoebes* 6×6 nest shelf 6 8-12
Swallows
Barn* 6×6 nest shelf 6 8-12
Purple Martin 6×6 6 2 1/4 1-2 6-20
Tree & Violet #0064f0 5×5 6-8 1 1/2 4-6 6-15
Thrushes/Bluebirds
American Robin* 7×8 nest shelf 8 6-15
Eastern Blue Bird 5×5 6-12 1 1/2 4-10 4-10
Western Blue Bird 5×5 6-12 1 1/2 4-10 4-10
Mtn Blue Bird 5×5 6-12 1 9/16 4-10 4-10
Woodpeckers
Downy 4×4 8-10 1 1/4 6-8 5-15
Hairy 6×6 12-15 1 1/2 9-12 8-20
Lewis’s 7×7 16-18 2 1/2 14-16 12-20
Flicker 7×7 16-18 2 1/2 14-16 6-20
Pileated 8×8 16-24 3×4 12-20 15-25
Red-headed 6×6 12-15 2 9-12 10-20
Yellow-bellied 5×5 12-15 1 1/2 9-12 10-20
Warblers
Prothonotory 5×5 6 1 1/8 4-5 4-8
Wrens
House 4×4 6-8 1 1/8 4-6 5-10
Carolina 4×4 6-8 1 1/4 4-6 5-10
Bewick’s 4×4 6-8 1 1/8 4-6 5-10

*These species species use a nesting shelf (3 sides and an open front) or a platform instead of a closed-box design.

**If the Osprey platform is placed inland, the height should always exceed the height of any nearby trees or 20 feet whichever is greater.

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