By Audrey HayesUpdated November 2026
Blue bird birdhouse plans give you a dimensioned cut list and a build sequence for an eastern or western bluebird nest box. With a single cedar or pine board and basic tools, you can finish one in an afternoon. The key details are the entry hole size, floor height, and ventilation, because bluebirds are picky about all three.
Know the Dimensions Bluebirds Need
Eastern and western bluebirds both nest in cavities about 5 by 5 inches inside, with a floor of roughly 4 by 4 inches. The entry hole should measure 1½ inches in diameter, which keeps out European starlings and most house sparrows. Mount the box 4 to 6 feet off the ground in an open area with short grass, and face the entrance away from prevailing winds.
Shopping for one? See our guide: 5 Best Birdhouses with License Plate Roof Plans for Backyard Builders (2026).
Cut List and Materials
Use ¾-inch rough cedar, pine, or another untreated softwood. Avoid pressure-treated lumber, since the chemicals can harm nestlings. Cut the pieces to these sizes:
| Part | Quantity | Size |
|---|---|---|
| Front | 1 | 10 in × 5 in (entry hole near top) |
| Back | 1 | 12 in × 5 in |
| Sides | 2 | 8 in × 5 in (top edges angled) |
| Floor | 1 | 5 in × 5 in |
| Roof | 1 | 7 in × 7 in |
Build Steps
- Drill the 1½-inch entry hole in the front piece, centered about 6 inches from the bottom edge.
- Drill four to six ⅛-inch drainage holes in the floor and two ventilation holes near the top of each side.
- Join the sides to the floor with 1¼-inch exterior screws, leaving the floor set back slightly from the bottom edge.
- Attach the front and back, making sure the front overhangs the bottom slightly so the box stays dry.
- Fasten the roof with a hinge or screws so you can open the box for cleaning each season.
- Sand the interior smooth and leave the outside unfinished or apply a light exterior stain on the roof only.
Mounting and Maintenance
Attach the box to a post or fence with a predator guard, since raccoons and cats can reach boxes on trees easily. Clean out old nesting material after each brood fledges, and check the box before the next nesting season begins.
Common Mistakes
- Making the entry hole larger than 1½ inches, which lets in starlings.
- Using treated lumber or painting the interior.
- Skipping drainage and ventilation holes, which leads to damp, overheated nests.
- Mounting the box in dense shade or near heavy brush.
- Installing perches, which help predators more than bluebirds.
Recommended Gear
- A forstner bit set in the 1½-inch size gives a clean, accurate entry hole without splintering. View on Amazon
- Exterior-grade wood screws resist rust and split less than nails in softwood. View on Amazon
- A predator guard for the mounting pole keeps raccoons and snakes away from the nest. View on Amazon
For more builds in the same style, see Plans for a Bluebird Birdhouse: Build One in a Weekend and Western Bluebird Birdhouse Plans: Build a Nest Box in One Afternoon. If you want a different species, Wren Birdhouse Plans Free: Build a Cedar House in One Weekend uses a smaller entry and interior.
FAQ
What size hole does a bluebird birdhouse need?
A 1½-inch diameter entry hole suits both eastern and western bluebirds. Larger holes allow starlings and house sparrows to take over the box.
How high should I mount a bluebird box?
Mount it 4 to 6 feet above the ground in an open area. Face the entrance away from prevailing winds and keep it away from dense trees.
What wood is best for bluebird houses?
Untreated cedar or pine at ¾-inch thickness works well. Avoid pressure-treated wood and paint on the interior.
Conclusion
With accurate dimensions, a 1½-inch entry hole, and proper ventilation, these blue bird birdhouse plans produce a box bluebirds will use. Build it from untreated softwood, mount it in an open field, and clean it after each nesting season. Consult a local wildlife or extension office if you are unsure which species nest in your area.
Related reading
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About Audrey Hayes
Audrey Hayes is part of our editorial team and reviews and edits our woodworking guides, checking product details against manufacturer specifications and owner feedback.
