Perch Supply
Nest box specifications

Birdhouse dimensions, by bird and by state

40 North American birds nest in boxes. Each one needs a specific hole, floor and height — get the hole wrong and you house sparrows instead of chickadees.

By species

BirdEntrance holeFloorHeight
Eastern Bluebird1 1/2 in round (1 9/16 in for Mountain/Western overlap)5 × 5 in4–6 ft on a baffled pole
Black-capped Chickadee1 1/8 in round4 × 4 in5–15 ft
Carolina Chickadee1 1/8 in round4 × 4 in5–15 ft
Purple Martin1 3/4–2 1/8 in round, or starling-resistant crescent (3 × 1 3/16 in)6 × 6 in minimum (6 × 12 in preferred)10–20 ft on a telescoping pole, 40+ ft from trees
Downy Woodpecker1 1/4 in round4 × 4 in5–20 ft, box packed with wood shavings
Hairy Woodpecker1 1/2 in round6 × 6 in8–20 ft, box packed with wood shavings
Tufted Titmouse1 1/4 in round4 × 4 in5–15 ft
White-breasted Nuthatch1 1/4 in round4 × 4 in5–20 ft
House Wren1 to 1 1/8 in round4 × 4 in5–10 ft near shrubs
Carolina Wren1 1/8–1 1/2 in4 × 4 in5–10 ft
Red-bellied Woodpecker2 1/2 in6 × 6 in12–20 ft
Northern Flicker2 1/2 in7 × 7 in6–20 ft
Red-breasted Nuthatch1 1/4 in4 × 4 in5–15 ft
Brown-headed Nuthatch1 in4 × 4 in5–12 ft
Tree Swallow1 1/2 in5 × 5 in5–10 ft
Eastern Screech-Owl3 in8 × 8 in10–30 ft
Great Crested Flycatcher1 3/4 in6 × 6 in8–20 ft
Mountain Chickadee1 1/8 in4 × 4 in5–15 ft
Chestnut-backed Chickadee1 1/8 in4 × 4 in5–15 ft
Oak Titmouse1 1/4 in4 × 4 in5–15 ft
Juniper Titmouse1 1/4 in4 × 4 in5–15 ft
Black-crested Titmouse1 1/4 in4 × 4 in5–15 ft
Pygmy Nuthatch1 1/4 in4 × 4 in8–20 ft
Western Bluebird1 1/2 in5 × 5 in5–10 ft
Mountain Bluebird1 9/16 in5 × 5 in5–10 ft
Bewick's Wren1 1/4 in4 × 4 in5–10 ft
Violet-green Swallow1 1/2 in5 × 5 in8–15 ft
Barred Owl7–8 in13 × 13 in12–20 ft
American Kestrel3 in8 × 8 in10–30 ft
Wood Duck4 × 3 in oval10 × 18 in6–20 ft
Western Screech-Owl3 in8 × 8 in10–30 ft
Hooded Merganser4 × 3 in oval10 × 18 in6–20 ft
Prothonotary Warbler1 1/8 in4 × 4 in3–6 ft over water
Ash-throated Flycatcher1 1/2 in6 × 6 in5–20 ft
Northern Saw-whet Owl2 1/2 in6 × 6 in10–20 ft
Barn Owl6 in16 × 24 in10–20 ft
Lewis's Woodpecker2 1/2 in7 × 7 in12–20 ft
White-headed Woodpecker1 1/2 in6 × 6 in10–20 ft
Brown-headed Nuthatch1 1/8 in4 × 4 in5–12 ft
Eurasian Tree Sparrow1 1/4 in4 × 4 in6–15 ft

By state & province

Alabama20 box-nesting birdsAlaska11 box-nesting birdsAlberta17 box-nesting birdsArizona19 box-nesting birdsArkansas20 box-nesting birdsBritish Columbia24 box-nesting birdsCalifornia26 box-nesting birdsColorado21 box-nesting birdsConnecticut20 box-nesting birdsDelaware22 box-nesting birdsFlorida20 box-nesting birdsGeorgia21 box-nesting birdsIdaho21 box-nesting birdsIllinois22 box-nesting birdsIndiana21 box-nesting birdsIowa20 box-nesting birdsKansas20 box-nesting birdsKentucky19 box-nesting birdsLouisiana20 box-nesting birdsMaine18 box-nesting birdsManitoba17 box-nesting birdsMaryland22 box-nesting birdsMassachusetts20 box-nesting birdsMichigan19 box-nesting birdsMinnesota20 box-nesting birdsMississippi20 box-nesting birdsMissouri22 box-nesting birdsMontana20 box-nesting birdsNebraska20 box-nesting birdsNevada21 box-nesting birdsNew Brunswick16 box-nesting birdsNew Hampshire18 box-nesting birdsNew Jersey23 box-nesting birdsNew Mexico19 box-nesting birdsNew York20 box-nesting birdsNewfoundland and Labrador9 box-nesting birdsNorth Carolina23 box-nesting birdsNorth Dakota15 box-nesting birdsNorthwest Territories8 box-nesting birdsNova Scotia13 box-nesting birdsOhio21 box-nesting birdsOklahoma25 box-nesting birdsOntario21 box-nesting birdsOregon27 box-nesting birdsPennsylvania21 box-nesting birdsPrince Edward Island11 box-nesting birdsQuebec16 box-nesting birdsRhode Island20 box-nesting birdsSaskatchewan18 box-nesting birdsSouth Carolina20 box-nesting birdsSouth Dakota20 box-nesting birdsTennessee21 box-nesting birdsTexas24 box-nesting birdsUtah20 box-nesting birdsVermont18 box-nesting birdsVirginia23 box-nesting birdsWashington25 box-nesting birdsWest Virginia21 box-nesting birdsWisconsin20 box-nesting birdsWyoming19 box-nesting birdsYukon11 box-nesting birds