By Audrey HayesUpdated November 2026
Free bluebird birdhouse plans give you everything needed to build a nest box that eastern and western bluebirds will actually use. The key details are a 1-1/2 inch entrance hole, a floor of about 4 x 4 inches, interior depth near 8 inches, and a mounting height of 4 to 6 feet in open ground. This guide walks through those measurements, the cut list, and the build steps.
Core Dimensions Bluebirds Need
Bluebirds are cavity nesters that prefer a small, dry box with a snug opening. Most free bluebird birdhouse plans use nearly identical dimensions because the birds are so consistent in their requirements. Stick close to these numbers rather than changing the design for looks.
Shopping for one? See our guide: 3 Best Free Printable Octagon Birdhouse Plans Frees (2026): Our Picks.
- Entrance hole: 1-1/2 inches in diameter, centered about 6 to 7 inches above the floor. Larger holes let in starlings and sparrows.
- Floor: 4 x 4 inches inside.
- Interior height: 8 to 10 inches from floor to roof.
- Roof overhang: 2 inches at the front to shade the entrance.
- Drainage and ventilation: Four 1/4-inch holes in the floor and a few small vents near the top of the side walls.
Cut List and Materials
Use rough-sawn or dressed 3/4-inch pine, cedar or cypress. Avoid pressure-treated lumber, since the chemicals can harm nestlings. Most free bluebird birdhouse plans call for a single 1×6 board about 6 feet long, which gives enough stock for the whole box.
| Part | Dimensions (inches) | Qty |
|---|---|---|
| Front | 5-1/2 x 10-1/2 (cut entrance later) | 1 |
| Back | 5-1/2 x 12 | 1 |
| Sides | 4-1/2 x 12 (cut top angle to match roof) | 2 |
| Floor | 5-1/2 x 5-1/2 | 1 |
| Roof | 6 x 8 | 1 |
Build Steps
- Cut all parts to length and mark the entrance hole on the front board, 6 to 7 inches above the floor line. Drill it with a 1-1/2 inch spade or Forstner bit.
- Drill four 1/4-inch drainage holes in the floor and cut a shallow notch or two in the front board for cleanout.
- Assemble the sides, floor and back with exterior-grade wood glue and 1-1/4 inch galvanized or stainless exterior screws. Pre-drill to prevent splitting.
- Attach the front with hinges or screws so you can open it for cleaning each season.
- Fasten the roof with a slight overhang, and add a 1-inch ventilation gap under the roof edges on the sides.
- Sand the edges lightly. Leave the interior rough so fledglings can climb out, and do not paint or stain the inside.
Mounting the Box
Place the box 4 to 6 feet off the ground on a post or fence line facing east or southeast, away from prevailing winds. Keep it in an open area with a few feet of clearance from shrubs. A predator guard, such as a metal baffle, helps keep out cats and raccoons.
Common Mistakes
- Making the hole larger than 1-1/2 inches, which lets in competing birds.
- Skipping drainage holes, which leads to damp nests and chilled chicks.
- Using treated lumber or painting the interior.
- Mounting the box in dense shade or too close to feeders that attract house sparrows.
- Forgetting to clean the box after each nesting season.
Recommended Gear
A Forstner bit set makes clean, flat-bottomed entrance holes without splintering the wood, which matters for a small opening. View on Amazon
Exterior stainless or galvanized deck screws resist rust and keep the box together through many seasons outdoors. View on Amazon
Related Plans and Guides
If you want a box for a different species, compare the design in Eastern Bluebird Birdhouse Plans: Free Dimensions and Build Steps or Western Bluebird Birdhouse Plans: Build a Nest Box in One Afternoon. For a simple first project, Plans for a Bluebird Birdhouse: Build One in a Weekend follows the same dimensions with a different build order. Builders looking for other cavity nesters can start with Wren Birdhouse Plans Free: Build a Cedar House in One Weekend.
FAQ
What size hole do bluebirds need?
Bluebirds need a 1-1/2 inch entrance hole. A larger opening allows starlings and house sparrows to enter and take over the nest.
What wood is best for a bluebird house?
Untreated pine, cedar or cypress works well. Avoid pressure-treated wood and do not paint the interior.
How high should a bluebird box be mounted?
Mount it 4 to 6 feet off the ground in an open area, facing east or southeast, with a predator guard if possible.
Conclusion
Free bluebird birdhouse plans are only as good as the measurements behind them, so the 1-1/2 inch hole and proper drainage matter most. Build the box from untreated wood, mount it in an open spot, and clean it after each season. With a single weekend and one 1×6 board, you can have a nest box ready for the next nesting cycle.
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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.
