Many thanks to Glaucomys.org for these nest box plans. To see which species you have in your area, visit The Squirrel Almanac and click on Squirrel Finder.

Building Tips:

1. Ensure access hole size is no larger than specified. You may wish to install a sheet metal occluder around entrance to prevent hole enlargement by unwanted species. No sharp edges!

2. Run a bead of silicone caulking along length of top where it meets backing board to prevent water infiltration. Drill (4) 1/4" (6.35mm) holes at corners of bottom for air flow purposes.

3. Use natural (untreated) pine or cedar. Thickness - 3/4" (19mm) to 1" (25mm). DO NOT stain or paint interior or exterior. DO NOT use plywood or chipboard.

4. It is advisable to provide a hinged access door for cleaning purposes. Clean ONLY during winter months as box will be vacant during this period. Front or side door access is preferred over top door access.

5. Optional: include a "ladder" inside box, beneath access hole, to assist nestlings in gaining egress.

6. Optional: install an outside ledge 1" (25mm) below access hole to facilitate ingress.

7. Optional: place strips or clumps of natural (not synthetic) fibre inside box for initial nesting material.

Placement tips for higher occupancy rates

1. Place in your oldest stands of deciduous (preferred) or mixed forest.

2. Min./Max. placement height - 10'/26' (3m/8m). Place so that access hole faces opposite prevailing wind.

3. Preferably, place so that mammalian predators cannot reach box via limbs or other trees.

4. Place so that box DOES NOT receive direct sunlight for extended periods.

5. Install near water (marsh, creek, etc.) or in mesic forest where possible. Install several boxes per acre.

Monitor occasionally for occupancy by rapping tree trunk and watching access hole. DO NOT over-do.