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Interior Floor Space Diameter of Entrance Hole Center of Entrance Hole to Floor Depth of Cavity Height of Box Placement
BLUEBIRDS (Eastern and Western)
5x5" 1-1/2" 7" 8-9" 5-15'
CHICKADEE (black-capped, Carolina, Boreal, and chestnut-backed)
4x4" 1-1/8" 6-8" 8-10" 8-15'
FINCH (house)
6x6" 2" 4" 6" 8-12'
FLYCATCHERS (great crested, olivacous, Western, and ash-throated)
6x6" 2" 7-8" 8-10" 8-20'
NUTHATCHES (red- and white-breasted)
4x4" 1-1/4" 6" 8" 12'
OWL (barn)
10x18" 6" 7" 15-18" 12-18'
OWL (screech)
8x10" 3-1/4" 12" 16-18" 12-30'
OWL (barred)
13x15" 8" 9-10" 16" 10-30'
OWL (saw-whet)
7x7" 2-1/2" 12" 12-15" 15-20'
ROBIN (American)
7x7" open on three sides 8" 6'
SWALLOWS (barn)
6x6" open on three sides 6" 8-12'
SWALLOWS (purple martin)
6x6" 2-1/2" 2-1/2" 6" 15-20'
TITMICE (plain, tufted, and bridled)
4x4" 1-1/4" 6" 6-8" 6-15'
WARBLER
5x5" 1-1/8 - 1-1/2" 6-8" 8-10" 4-6'
WOODPECKER (downy)
4x4" 1-1/4" 6-8" 8-10" 12-15'
WOODPECKER (flicker)
7x7" 2-1/2" 14-16" 16-18" 6-20'
WOODPECKER (gold-fronted and hairy)
6x6" 1-3/4 - 2" 9-12" 13-15" 8-20'
WOODPECKER (red-headed and red-bellied)
6x6" 2" 9-12" 12-15" 12-20'
WRENS (Bewicks and house)
4x4" 1-1/8" 5-1/2" 7-8" 6-10'
WRENS (brown-throated)
4x4" 1" 3-1/2 - 6" 6-8" 6-10'