The average custodian salary at Carlsbad was $65,600 , which is 10 percent lower than the average salary for this job in California, and 8 percent lower than the national average for this job . Custodian salaries at Carlsbad typically range from $53,554 to $73,733 (25th to 75th percentile). The highest reported custodian salary was $94,674. There are 10 employees at Carlsbad with the job title custodian.