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Northern cardinal birdhouse plans give you a simple, sturdy box that cardinals will actually use, provided you get the dimensions and features right. This guide walks you through a practical design with a cut list, assembly steps, and placement advice, so you finish with a birdhouse that stays dry, ventilated, and easy to clean. Plan on a weekend build using basic woodworking tools.
Why Northern Cardinals Need a Different Kind of Birdhouse
Most small songbird houses are built around a 1 1/8-inch or 1 1/4-inch entry hole, which suits wrens, chickadees, and bluebirds. Cardinals are a different story. They are larger, around 8 to 9 inches long, and they prefer open, shrubby nest sites over enclosed boxes. In the wild they build cup nests in dense shrubs, vines, and conifers, often a few feet off the ground.
That means a traditional birdhouse with a small hole will usually be ignored. Cardinals sometimes accept an open-front or half-open shelter, or a box with a larger cavity and a wide entry, but success is far from guaranteed. Many backyard builders find that a cardinal-friendly shelter works best as a covered, open-front nest box placed in dense cover. Set your expectations accordingly: you are building a sheltered nesting site, not a guaranteed tenant.
Design Overview: The Open-Front Cardinal Shelter
The design below is a simple open-front shelter, roughly 8 inches wide by 8 inches deep by 9 inches tall at the back, with a sloped roof and a large open side facing the front. The open face lets adults fly in and out easily and gives them a clear view of the surroundings, which cardinals appreciate. A short overhanging roof keeps rain off the nest.
Because the front is open, predators have better access, so mounting location and cover matter a great deal. We recommend fastening the shelter in a dense evergreen, a thick hedge, or against a trellis with climbing vines.
Dimensions and Cut List
Use 3/4-inch cedar, pine, or cypress boards, or 1/2-inch exterior plywood for the back and sides if you want lighter weight. Untreated cedar is the traditional choice because it resists rot without chemicals. All dimensions below are nominal finished sizes.
| Part | Quantity | Dimensions (inches) | Notes |
|---|---|---|---|
| Back panel | 1 | 9 x 8 | Long edge is the top |
| Side panels | 2 | 9 x 8 | Angle top edge to match roof slope |
| Floor | 1 | 8 x 7 1/4 | Leave 1/4-inch gap for drainage |
| Front lip (perch) | 1 | 8 x 1 1/2 | Optional, cuts down on drafts |
| Roof panel | 1 | 10 x 9 | Overhangs 1 inch front and sides |
| Mounting cleat | 1 | 6 x 1 1/2 | Screws to the back for wall or post mounting |
Add a 1/2-inch hole in each side panel near the top for ventilation, and drill four 1/4-inch drainage holes in the floor.
Tools and Materials You Will Need
- Miter saw or hand saw for square cuts
- Table saw or circular saw with a guide for ripping boards
- Drill with 1/4-inch and 3/8-inch bits and a countersink bit
- Random orbit sander, 120-grit paper
- Exterior wood glue (rated for outdoor use)
- 1 1/4-inch exterior-rated deck screws or galvanized wood screws
- Clamps, combination square, tape measure, pencil
- Exterior-grade, non-toxic finish or none at all
Step-by-Step Build Instructions
Step 1: Cut All Parts to Size
Cut each piece from the cut list. Check that the two side panels are identical and that the back is square. A small error here compounds, so test-fit before you drill anything.
Step 2: Angle the Side and Roof Cuts
Mark the top of each side panel so the front edge sits about 7 inches tall and the back edge stays at 9 inches. This gives the roof a gentle slope so water sheds forward. Cut the roof panel and sand all edges smooth to protect birds from splinters.
Step 3: Assemble the Back and Sides
Glue and screw the side panels to the back, using two screws per joint, countersunk slightly. Keep the back flush with the sides at the bottom. Check for square with your combination square before the glue sets.
Step 4: Attach the Floor
Set the floor inside the assembly, leaving the small drainage gap at the front. Glue and screw it through the sides. The floor should be a few millimeters below the front edge so rain does not pool.
Step 5: Add the Roof and Mounting Cleat
Center the roof so it overhangs about 1 inch on the front and sides. Screw it down from the inside through the side panels. Attach the mounting cleat to the back with glue and screws, then check that it sits flat.
Step 6: Sand, Finish, and Dry
Sand all surfaces and round the front corners. If you finish the wood, use a penetrating, non-toxic exterior sealer on the outside only. Never paint or stain the inside. Allow at least 24 hours of drying time before mounting.
Placement and Mounting
Mount the shelter 5 to 10 feet off the ground, facing away from prevailing winds and direct afternoon sun. Attach it to a sturdy post, the trunk of a conifer, or a trellis. The most important factor is cover: place it within a dense shrub, a yew, arborvitae, or a vine-covered fence where adults can approach quickly and hide from hawks and cats.
Avoid high-traffic areas, feeders that attract crowds, and open lawns. Cardinals are territorial, so a quiet corner of the yard with shelter and a water source stands the best chance. If you want to pair the shelter with feeding, our cardinal-friendly plant guide and feeder notes can help you build a complete habitat.
Common Mistakes
- Using a small entry hole. Cardinals will not use a 1 1/8-inch hole. Choose an open or wide-front design.
- Skipping drainage. Without floor gaps and ventilation, moisture builds up and nests rot.
- Placing the shelter in the open. Exposure to hawks and weather reduces use. Always add cover.
- Using treated lumber. Chemical treatments can harm birds. Stick with untreated cedar or other untreated, rot-resistant wood.
- Cleaning in the wrong season. Clean out old nesting material after the breeding season, typically late summer or early fall, and never during active nesting.
Tips for Better Results
- Build two or three shelters and place them at different heights and locations to see which one gets used.
- Add natural nesting material such as pine needles or dry grass to the floor to encourage use.
- Check the shelter once a month during nesting season from a distance, and avoid disturbing an active nest.
- Consider a nearby water source; cardinals use birdbaths year-round.
Recommended gear
A few tools make this build faster and cleaner. A miter saw gives you the square, repeatable cuts this design depends on: View on Amazon. A random orbit sander removes saw marks and rounds edges quickly, which matters for birds: View on Amazon. Exterior-rated deck screws resist corrosion in outdoor conditions, so use galvanized or coated fasteners: View on Amazon. A drill with a countersink bit lets you seat screws flush without cracking cedar: View on Amazon.
FAQ
What size hole do northern cardinals need?
Cardinals are not cavity nesters in the usual sense, so a small round hole will generally be ignored. An open front or a wide entry, roughly 6 inches or more, works far better for this species.
Do cardinals use birdhouses at all?
Occasionally, yes, especially open-front shelters placed in dense cover. Most cardinals still prefer natural shrub nests, so a birdhouse is best seen as a supplementary option.
What is the best wood for a cardinal shelter?
Untreated cedar is a common choice because it resists rot naturally. Cypress and pine also work if left untreated and sealed only on the outside.
When should I clean out the shelter?
Clean it after the breeding season ends, usually late summer or early fall. Avoid cleaning while nests are active, and wear gloves and a mask when removing old material.
Should I paint the inside of the shelter?
No. Leave the interior bare and unfinished. Paint or stain can release fumes and may harm nestlings.
Where should I hang the shelter?
Mount it 5 to 10 feet high in dense shrubs, evergreens, or against a vine-covered trellis, away from direct afternoon sun and heavy wind.
Do I need a predator guard?
Because the front is open, predator protection helps. Dense surrounding cover is the most effective defense, and a baffle on the mounting post can discourage climbing animals.
Is this project suitable for beginners?
Yes. It uses straight cuts, simple angles, and basic screw-and-glue assembly, so it suits anyone with a saw, drill, and a few hours.
Conclusion
A well-built open-front shelter, placed in dense cover and kept clean, gives northern cardinals a chance to nest in your yard. Use untreated cedar, leave the interior bare, and mount the shelter where adults can approach quickly. Pair it with a water source and native shrubs for the best results.
