Nest Box Hole-Size Finder

Pick the bird you want to attract and get the exact entrance-hole diameter, mounting height, and placement tips. Based on BTO and RSPB specifications.

Blue Tit

Entrance hole

25 mm

circular hole

Height from ground

1.5–3 m

Orientation

North to east

Erect by

Nov–Jan

Tips

Avoid south-facing; direct sun overheats chicks.

Track who nests in your box

Log the first time you see a species → it goes in your collection as a card. That's how It's Birds Mate works.

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Data curated from BTO Nest Box Guide + RSPB. Hole sizes are minimum recommended diameters. See /tools for more.