The average plan checker salary at Stockton was $111,109 , which is 3 percent lower than the average salary for this job in California, but 7 percent higher than the national average for this job . Plan Checker salaries at Stockton typically range from $79,302 to $142,916 (25th to 75th percentile). The highest reported plan checker salary was $147,675. There are 4 employees at Stockton with the job title plan checker.