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Wren birdhouse plans free of charge are easy to find, but many of them give vague dimensions that leave wrens uninterested. This guide gives you a complete, buildable design with a cut list, entrance hole sizing, ventilation and mounting details. By the end, you will have a sturdy cedar house ready to hang, plus the know-how to adjust it for your yard.
What Makes a Good Wren Birdhouse
House wrens, the small brown birds that sing loudly from fence posts and shrubs, are cavity nesters. They want a snug, dark box with a small round entrance and a floor they can line with twigs. They are not picky about looks, but they are picky about size. A house that is too large, too open or too exposed will be ignored or abandoned.
Most of the free plans you will see online share the same core features. The interior floor is roughly 4 inches square, the entrance hole is about 1-1/8 inches in diameter, and the box sits 6 to 10 feet off the ground. Those numbers are the foundation of this design.
Materials and Tools You Will Need
Choose untreated softwood or rough-sawn cedar. Cedar resists rot without chemicals, and untreated wood is safer for birds. Avoid pressure-treated lumber, painted or stained surfaces inside the box, and any wood that has been sealed with a finish containing solvents.
Materials
- One 1×6 cedar board, at least 36 inches long (nominal 3/4 inch thick, actual about 5/8 inch)
- One 1×4 or scrap piece for the roof panel, roughly 8 inches long
- Exterior-grade wood screws, 1-1/4 inch, stainless or galvanized
- Exterior wood glue (optional but helpful)
- Stainless steel or galvanized nails for the roof hinge, if you plan to add one
Tools
- Miter saw or hand saw
- Drill with a 1-1/8 inch Forstner bit or hole saw
- Drill with a 1/8 inch bit for pilot holes and drainage
- Tape measure, square and pencil
- Clamps and a screwdriver or drill driver
- Sandpaper, 120 grit
Cut List for a Wren House
The following dimensions produce a box with a 4 by 4 inch interior floor and a roof that overhangs the front for rain protection. Measurements are for the cedar board after it is ripped to actual thickness.
| Part | Quantity | Dimensions (inches) | Notes |
|---|---|---|---|
| Front | 1 | 4-1/2 x 9-1/2 | Cut entrance hole 1-1/4 inches from top |
| Back | 1 | 4-1/2 x 9-1/2 | Leave solid |
| Sides | 2 | 4-1/2 x 7-1/2 | Angle top edges to match roof slope |
| Floor | 1 | 4 x 4 | Drill four 1/4 inch drainage holes |
| Roof | 2 | 5 x 6 | Slight overhang on front and sides |
Cut the front and back so their bottoms are flush with the floor. The sides should sit between the front and back, which makes the floor fit inside and keeps screws out of the entrance area.
Building the Wren House Step by Step
Step 1: Cut and Mark Your Parts
Cut each piece to the dimensions above. Mark the entrance hole center on the front panel, 6 inches down from the top edge of the front board and centered side to side. Double-check that the marks are square before you drill.
Step 2: Drill the Entrance Hole
Clamp the front panel to a scrap board to prevent tear-out. Drill the 1-1/8 inch entrance hole with a Forstner bit or hole saw. Keep the hole at the marked center. Sand the edges lightly so no splinters could catch a bird’s feathers.
Step 3: Assemble the Box
Apply exterior glue to the edges of the sides and screw them to the back panel first. Attach the front panel next, then add the floor. Use two screws per joint, drilling pilot holes with the 1/8 inch bit to prevent splitting. Keep the floor a fraction of an inch above the bottom edges of the walls so water drains out.
Step 4: Attach the Roof
Fasten the roof panels so they overlap slightly at the peak. Use a hinge or a removable screw on one side so you can open the house to clean it out each autumn. Leave the roof overhang generous on the front to shelter the entrance.
Step 5: Drill Ventilation and Drainage
Drill four 1/4 inch holes through the floor and two small vent holes near the top of each side panel. This keeps the interior dry and reduces overheating in summer.
Step 6: Finish Safely
Sand all exterior surfaces. If you want to protect the wood, apply a water-based exterior sealer to the outside only. Let it cure fully before mounting. Never coat the inside.
Mounting and Placement
Wrens prefer open yards with some shrubs nearby for cover. Mount the house 6 to 10 feet above the ground on a post, fence line or tree trunk. Face the entrance away from prevailing winds and direct afternoon sun. Avoid placing it near busy feeders, where larger birds can crowd out wrens.
Use a single screw or a mounting bracket on the back. Do not nail through the front. If you attach the house to a tree, use a wire or strap that will not girdle the trunk as it grows.
Common Mistakes
- Entrance hole too large. Anything bigger than about 1-1/4 inches invites starlings and sparrows, which will evict wrens.
- No drainage. A flat floor with no holes traps moisture and can harm nestlings.
- Interior paint or varnish. Chemicals can be harmful to birds. Keep the inside bare wood.
- Mounting too low or in full sun. Wrens prefer partial shade and some height.
- Forgetting to clean it. Remove old nesting material in late autumn to prevent parasites from building up.
Tips for Attracting Wrens
- Install the house by early spring so wrens can claim it before they start nesting.
- Add a few brush piles or dense shrubs within 30 feet of the box.
- Hang two or three houses at different spots if you have a larger yard, since male wrens often build several nests.
- Avoid pesticides in the area, because wrens depend on insects for food.
Recommended gear
A few tools make this project cleaner and more accurate. A Forstner bit gives a crisp, flat-bottomed entrance hole that matters for a tidy finish. View on Amazon
A flush-cut or fine-tooth saw keeps cedar edges clean without heavy tear-out. View on Amazon
Stainless exterior screws resist rust and will not stain the cedar over time. View on Amazon
A small square and clamps help you keep the box true during assembly. View on Amazon
FAQ
Are these wren birdhouse plans free to use?
Yes. The dimensions in this guide are offered as free plans you can build for personal use without paying for a download.
What size hole do wrens need?
House wrens generally use an entrance hole about 1-1/8 inches across. Holes larger than about 1-1/4 inches often admit competing species.
What is the best wood for a wren house?
Untreated cedar or pine works well. Cedar lasts longer outdoors without chemical treatment.
How high should I mount a wren house?
Mount it 6 to 10 feet off the ground, in a spot with partial shade and nearby shrubs for cover.
When should I put up the house?
Install it by early spring, before wrens begin scouting nest sites.
Do wrens need a perch?
No. Wrens cling to the entrance without one, and a perch can actually help predators reach nestlings, so most experienced builders skip it.
How often should I clean the box?
Clean it once a year in late autumn or early winter, after nesting season ends, to remove old material and parasites.
Can I use a different design?
Yes, as long as the interior is roughly 4 inches square, the entrance is about 1-1/8 inches and the box drains well. Stick close to these numbers for the best results.
Conclusion
With the cut list, entrance size and placement tips in this guide, you can build a wren house that meets what these birds need. Cedar, a 1-1/8 inch hole and a spot 6 to 10 feet up will give you the best chance of attracting a pair. Clean the box each year, and you may see wrens return season after season.
