Every detail has a reason. Not because it looks nicer – but because it works for the birds.
Entry hole: exactly 28mm (just over an inch). "That ain't random," says Earl. "One and a quarter inches – perfect for blue tits, great tits, and coal tits — the small hole keeps starlings and house sparrows from taking over. Big enough that they fly in and out easy. But too small for house sparrows and starlings that bully the little guys out. An eighth of an inch either way makes the difference between a full nest and an empty box."
Solid, untreated American white oak, 19mm wall thickness. "White oak is naturally rot-resistant – no paint, no stain, no chemicals needed. And three-quarter-inch walls insulate. In winter, the nest holds heat. In summer, nothing turns into an oven. That's the difference between a house that works and one that doesn't."
Extended roof overhang. The roof extends well past the entry hole on purpose. "Keeps driving rain out. Blocks direct afternoon sun. And – this is the important part – it stops grey squirrels and cats from reaching down into the hole from above. A flat-roofed birdhouse is an all-you-can-eat buffet for predators."
Ventilation slots in the floor. Small, carefully placed openings allow air to circulate and moisture to drain. "No mold, no standing water, no mite nursery."
Side-opening clean-out panel. "Pop it open in October, pull out the old nest, give it a quick brush – done. The house lasts for decades this way. Season after season. I've got customers still using houses I built in the nineties."
Stainless steel screw eye for hanging. Won't rust, lasts for years, easy to hang on a branch, a post, or a porch beam. "No plastic hooks, no cheap wire. Simple, solid, done."