Anyone who wishes to engage in the business of installing, repairing, or maintaining security systems must obtain an S-license from the Department of Public Safety. The S-license was formerly known as the "Security Systems Contractor's License." The name was recently changed so as to avoid confusion with a wholly different license of a similar name issued by the Board of State Examiners of Electricians. "Security systems" include any electrical device that is set up to survey or detect intrusion. In order to obtain an S-license, a person must hold a valid electrician's license of any grade and complete the Department's application process. You may obtain an application for an initial issuance or renewal by clicking on the appropriate link below.

Anyone who holds an S-license may employ as many workers as they deem necessary. However, every individual employed by an S-license holder must obtain a Certificate of Clearance prior to engaging in any work for them. In order to obtain a Certificate of Clearance for his or her employees, the S-licensed employer must perform a criminal background check on each prospective worker. The S-licensed employer must then submit an attestation including the results of the background check to the Department. You may obtain the complete Certificate of Clearance application package, including instructions on how to conduct criminal background checks, by clicking on the "Certificate of Clearance application" link below.

Though the S-license program has been enhanced and some changes made to the application process, all existing S-licenses, "Security Systems Contractor's Licenses," and Certificates of Clearance shall remain valid and do not have to be renewed until they expire. Renewals must conform to the new requirements. The laws pertaining to S-licenses and Certificates of Clearance may be found in the Massachusetts General Laws chapter 147, sections 57 through 61. Prior to contacting the Department with any questions, please review the FAQs ("Frequently Asked Questions") link below for further information. All applications, inquiries or suggestions should be mailed to:


Please send all applications and correspondence effective November 18, 2015 to the address below: 

Department of Public Safety (S-License)
50 Maple Street, Suite 1
Milford, MA 01757

Thank you for visiting the S-License website.



S License Application pdf format of appl_s_license_jun_2_2015.pdf

S License RENEWAL Application pdf format of appl_s_renew_license_jun_2_2015.pdf

Certificate of Clearance Application pdf format of appl_s_license_cert_clearance_jun_12.pdf

Certificate of Clearance RENEWAL Application pdf format of renew_appl_s_license_cert_clearance_august_12

Certificate of Clearance Application Instructions pdf format of inf_s_license_appl_instruction.pdf