Always use corrosion resistant screws and hardware. Drill countersunk pilot holes in primary work pieces (first piece the screw is inserted into). Drill regular pilot holes in secondary work pieces.
Clean and disinfect nest boxes with a 5% bleach and 95% water mix after the brooding season to prevent spread of disease and parasites. Use rubber gloves, eye protection, spray bottles, and sponges to completely saturate nest box interiors.
Use softwood. Cedar is beautiful, easy to work with, is often rough-cut, or simulated so for fencing, which is good for grip, and it endures. When fresh, it has a repellent effect on some insect pests. Pine is also a good, abundant softwood.
Hardwoods are difficult to work with, heavier and more suited to fine joinery used in furniture. It’s more work and not necessary.
3/4″ wood stock is the most common. 5/8″ stock where called for can be supplied with fencing material from most lumberyards. 5/8″ stock is used on the smaller nest boxes because 3/4″ stock is too thick and makes them look odd.
Phoebe & Flycatcher Bird Houses
Two Flycatcher Bird Houses and Four Phoebe Platforms