The cost of a termite chemical barrier treatment to be installed is charged by the lineal metre and it also depends on what is up against your home such as concrete, pavers or garden beds. Prices can also change depending on what chemical barrier you decide to go with as repellent chemicals are the cheapest to use. Where as a termidor chemical barriers is more expensive but has a greater success rate in eradicating termites and lasts 4 times longer.