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The following birdhouse/nest box size chart for cavity nesting birds has been provided by the US Department of the Interior

Birdhouse Dimensions

from Conservation Bulletin 14

U.S. Department of the Interior

Kind Of Bird

A
FloorSize

B
Depth

C
EntranceHeight

D
HoleDiameter

Height Above Ground (feet)

Bluebird

5 X 5

8

6

1 1/2

5 - 10

Chickadee

4 X 4

8 - 10

6 - 8

1 1/8

6 - 15

Titmouse

4 X 4

8 - 10

6 - 8

1 1/4

6 - 15

Nuthatch

4 X 4

8 - 10

6 - 8

1 1/4

12 - 20

Wren

4 X 4

6 - 8

4 - 6

1 1/4

6 - 10

Bewick's Wren

4 X 4

6 - 8

4 - 6

1 1/4

6 - 10

Carolina Wren

4 X 4

6 - 8

4 - 6

1 1/2

6 - 10

Swallow

5 X 5

6

1 - 5

1 1/2

10 - 15

Purple Martin

6 X 6

6

1

2 1/2

15 - 20

House Finch

6 X 6

6

4

2

8 - 12

Starling

6 X 6

16 - 18

14 - 16

2

10 - 25

Crested Flycatcher

6 X 6

8 - 10

6 - 8

2

8 - 20

Flicker

7 X 7

16 - 18

14 - 16

2 1/2

6 - 20

Golden-fronted
Red-headed
Woodpecker

6 X 6

12 - 15

9 - 12

2

12 - 20

Downy Woodpecker

4 X 4

8 - 10

6 - 8

1 1/4

6 - 20

Hairy Woodpecker

6 X 6

12 - 15

9 - 12

1 1/2

12 - 20

Screech Owl

8 X 8

12 - 15

9 - 12

3

10 - 30

Saw-Whet Owl

6 X 6

10 - 12

8 - 10

2 1/2

12 - 20

Barn Owl

10 X 18

15 - 18

4

6

12 - 18

Sparrow Hawk

8 X 8

12 - 15

9 - 12

3

10 - 30

Wood Duck

10 X 18

10 - 24

12 - 16

4

10 - 20