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Who We Are

Insource Insurance Agency is a full-service property and casualty insurance agency, serving businesses, individuals and families throughout the state of California. Insource takes a personalized and friendly approach to providing the absolute best insurance protection possible, while looking for every opportunity to maximize savings for our clients.

Founded by 30-year insurance veteran John Colston, Insource was established on the premise that our customers would be attracted to a highly personalized approach to providing affordable insurance protection. The success of this approach has been proven through over 4 decades of interaction with loyal clients.

Our Guiding Principles    


  • Integrity & honesty comes before profitability
  • We are respectful and courteous to everyone
  • We are easy to work with
  • We operate with a attitude of delivering what we promised
  • We seek excellence in everything we do
  • We go the extra mile and we don’t cut corners
  • We seek constant improvement in every area of our agency