Members of CARRI have been building and placing nest boxes for a large variety of birds. Below are the dimensions that we use for our nest boxes

Barn Owl Nest Box (6 inch (15.24 cm) entrance hole)

Top       40X15 (101.6 cm x 38.1 cm)

Front   40X18  including door cut into front Door is 13x12 (101.6 cm X 45.72 cm) Door (33.02 x 30.48 cm)

Sides  18x14.25  (X2) (45.72 cm x 36.195 cm)

Back   24x40 (60.96 cm x 101.6 cm)

Bottom  18X40 (45.72 cm x 101.6 cm)

Cover over top so rain can runoff top 42x16 (106.68 cm x 40.64 cm)


Eastern Screech Owl Nest Box (4 inch (10.16 cm) entrance hole)

Front:  12x16 (30.48 cm x 40.64 cm)

L side: 12x16 (30.48 cm x 40.64 cm)

R side: 12x15 cut in half (3.48 cm x 38.10 cm)

Top: 12x16 (30.48 cm x 40.64 cm)

Back: 12x26 (30.48 cm x 66.04 cm)

Bottom: 12x12 (30.48 cm x 30.48 cm)


American Kestrel Nest Box (3 inch (7.62 cm) entrance hole)

Front: 11 x 16 inches (27.94 cm x 40.64 cm)

Back: 11 x 22 inches (27.94 cm x 55.88 cm)

Side : 11 x 16 inches (27.94 cm x 40.64 cm)

Side : 7 x 9 inches  (Door on side of Box) (17.78 cm x 22.86 cm)

Top: 11 x 13 inches (27.94 cm x 33.02 cm)

Bottom: 11 x 9.5 (27.94 cm x 24.13 cm)


Bluebird/Swallow/House Wren Nest Box (1.78 inch (4.52 cm) entrance hole)

Front: 6 x 9 (15.24 cm x 22.86 cm)

Back: 6 x 13.5 (15.24 cm x 34.29 cm)

Side: 6 x 9 (15.24 cm x 22.86 cm)

Side: 6 x 9 (15.24 cm x 22.86 cm)

Top: 7.5 x 6 (19.05 cm x 15.24 cm)

Bottom: 6 x 6 (19.05 cm x 19.05 cm)