The most effective deterrent to carpenter bees is a well painted, finished surface. By maintaining sound, finished wood surfaces, bees can be prevented from establishing nests around your home. Painted surfaces are unattractive to nesting bees. If tunnels are evident, sealing off the tunnel is recommended. Nail holes and cracks should be filled with caulk or putty prior to painting. Pressure treated wood and wood preserved with metallic salts, such as copper naphthanate, are also effective deterrents against carpenter bees.
Carpenter bees are a native species, are not aggressive, and are only noticeable in late spring-early summer.