Choose untreated exterior-grade wood
Cut front, back, sides, roof, and landing board pieces
Make the interior rough or add horizontal grooves
Assemble the box tightly with no gaps
Seal all exterior seams with caulk
Paint the outside with dark, non-toxic exterior paint
Leave the inside unpainted
Add a vent or chamber space if building a multi-chamber house
Attach a slanted roof to shed water
Install the bat house at least 12 to 20 feet high
Mount it on a pole or building, not a tree
Face it toward south or southeast in a sunny location
Keep it away from bright lights and heavy human activity
Place it near water and insect-rich habitat
Secure it firmly so it does not sway
Check it periodically for damage or pests