Plan it
Board cut schedule
Every panel you'll need to cut, sized to actual milled lumber dimensions. Print this page or download the PDF to take into your workshop.
| Panel | Dimensions | Qty | Notes |
|---|---|---|---|
| Back | 11.25″ × 30″ | 1 | Provides ample space for lag bolt mounting at top and bottom |
| Front | 11.25″ × 16″ | 1 | The 7" gap between the top of this panel and the roof creates the entrance |
| Side | 11.25″ × 23″ | 2 | Angle the top edge from 23" at the back to 16" at the front to match roof slope |
| Roof | 11.25″ × 16″ | 1 | Attach with a slight overhang to protect the entrance from rain |
| Floor | 9.75″ × 11.25″ | 1 | Recess 1/4" up from bottom; drill 1/2" drainage holes and trim corners |
Source board layout
The back, front, sides, and roof are all the full width of the 1x12 board. The floor must be ripped to 9.75" wide so it fits between the two side panels.
Get materials
Shopping checklist
Check off items as you gather them — your progress is saved in your browser so you can come back to this page anytime.
Build it
Construction notes
- Wood: 3/4-inch (19 mm) untreated cedar or cypress for durability. Pine is acceptable but will not last as long.
- Boards: One 1" x 12" x 12' untreated cedar board yields all panels.
- Hardware: 30x 2" galvanized deck screws, 4x 3" stainless steel lag bolts, 4x heavy-duty washers, 2x 3-inch bags of pine wood shavings
- Ventilation: Leave a 1/2-inch gap between the top of the side panels and the roof for cross-ventilation.
- Drainage: Drill at least five 1/2-inch holes in the floor and clip the corners of the floor panel to allow liquid waste to escape.
- Predator guard: Since these boxes are mounted high in mature trees, a 3-foot wide aluminum sheet metal band wrapped around the trunk 4 feet off the ground is the most effective way to stop climbing raccoons and snakes.
Install it
Place it & time it right
Place in a mature forest stand, ideally near a water source like a creek or swamp. Ensure there is a clear flight path to the entrance and avoid areas with high Great Horned Owl populations, as they are significant competitors and predators.
Seasonal timeline
When to install
Install by late autumn or early December; Barred Owls begin scouting nesting sites in mid-winter.
Nesting begins
Nesting begins as early as January in the Southeast and Gulf Coast. In the Midwest and Northeast, expect activity in February or March, while Northwest populations typically begin in late March.
Eggs & incubation
2-3 eggs (occasionally 4) · 28-33 days
Fledging & cleaning
28-35 days after hatching · Clean the box annually in October. Remove all old nesting material and debris, scrub with a weak bleach solution (1 part bleach to 10 parts water), and add 2-3 inches of fresh pine shavings.
Regional considerations
Barred Owls are native to the eastern half of North America, ranging from Florida to southern Canada. They have recently expanded across the Pacific Northwest and into California, where they thrive in older, dense coniferous and deciduous forests.
Nesting occurs earlier in southern latitudes where winters are milder. In higher elevations and northern ranges, the start of nesting is often delayed until the spring thaw increases small mammal activity.
Raccoons are the primary threat to eggs and owlets; the height of the box and a trunk baffle are the best defenses. Great Horned Owls may attack adults or take over the box if it is placed in too open an area.
Add a camera
Watch it happen
Barred Owls are strictly nocturnal and highly light-sensitive, meaning you must use a camera with high-quality infrared (IR) night vision. Avoid any cameras with visible white LEDs, as these will disturb the owl and may lead to nest abandonment. A high-definition interior IP camera with a wide-angle lens is ideal for capturing the large floor area and the height of the box.
The best mounting position is in one of the top rear corners of the box, angled downward toward the center of the floor. Because Barred Owls are powerful birds, ensure the camera is securely housed in a protective bracket and that all cables are routed through the back of the box or protected by metal conduit to prevent the owls from pecking or pulling at them.
Given the size of the box and the bird, a small USB-powered interior camera may struggle with the focal distance; a dedicated bird box camera or a small PoE (Power over Ethernet) security camera is recommended for the best detail. These cameras allow for continuous streaming so you don't miss the dramatic moments when the male brings prey to the brooding female.
For external monitoring, place a cellular or Wi-Fi-enabled trail camera on a neighboring tree approximately 10 to 15 feet away. This provides a secondary view of the 'landing pad' entrance, allowing you to observe the parents' arrival and the owlets as they begin 'branching' out of the nest before they are fully capable of flight.
Off-grid power with a USB solar panel
Nest boxes are almost always far from a power outlet. A 5V USB solar panel with a built-in battery is the cleanest solution — it powers most interior USB cameras, Blink cameras (via their USB port), and many trail cameras indefinitely.
- Panel position: Mount on the same post as the box, 1–2 ft above, angled 30–45° from vertical and facing south.
- Cable routing: Run inside split loom or 1/2″ conduit so squirrels can't chew it. Enter through the same grommeted hole as the camera cable.
- Battery buffer: Pick a panel with a 5–10 Ah battery so the camera runs through cloudy days and overnight for nocturnal species.
- Weatherproofing: Wrap every cable connection in self-amalgamating rubber tape.
Troubleshoot
Common problems & solutions
Squirrels nesting inside
Install the box as late as possible (December) and clean out squirrel nests immediately if they appear before the owls arrive.
Owlets falling out (branching too early)
Ensure the front panel is rough-sawn or has horizontal grooves cut into it to help owlets climb back up.
Box is too heavy to mount alone
Use a pulley system and a 'cleat' mounting bracket where a piece of wood on the box interlocks with one on the tree.
Bees or wasps in the box
Rub a thin layer of unscented bar soap on the interior ceiling of the roof to prevent comb attachment.
Common questions
Frequently asked questions
Barred Owls require a large opening, typically a 7 x 7 inch square or an 8-inch diameter circle. Unlike smaller birds, they prefer the entrance to be at the very top of the front panel, just under the roof.
For safety and high occupancy rates, mount the box between 15 and 30 feet high. It must be high enough to provide a clear flight path over the understory but low enough that you can safely access it for maintenance with a ladder.
Late fall or early winter is best, specifically by December. Barred Owls are non-migratory and start looking for potential nesting sites months before they actually lay eggs in late winter.
Face the box toward the Southeast or East. This protects the interior from prevailing westerly winds and ensures the morning sun warms the box without overheating it in the afternoon.
Use a metal stovepipe-style baffle on the tree trunk below the box. If squirrels still get in, you must manually remove their nesting material until the owls claim the territory.
Barred Owls raise only one brood per year. If a nest fails very early in the season, they may occasionally attempt a second clutch, but this is rare.
Clean the box in late October or early November. It is crucial to replace the wood shavings annually, as owls do not build nests and the owlets produce significant amounts of waste.
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