Where were you in the year of 1968? Were you working? Raising a family? Playing with the original “Hot Wheels” as a child? Or maybe you weren’t even a glimmer in your parents’ eye? Our founder, Leigh J. Johnson, was in his basement in Rochester, MN creating this great company, which we know today as Custom Alarm. A company that started out small and now proudly has more than 65 caring employees committed to taking care of our growing customer base. A company that not only provides security solutions for home and business owners, but offers custom solutions to fit any size, budget, or needs. Custom Alarm teams up with you for all your fire alarm, intrusion, video surveillance, access control, home automation and so much more.


Local, Trusted Partner

All of our dedicated employees take pride in working for Custom Alarm; no one wants to see a neighbor, friend, or family member unhappy with a security decision they made. We live and work in the communities we protect, providing top-notch services is a must, and we are committed to making it right.

While we may not be big in size, we are big at heart; we care about all of our customers and it shows through every interaction. We have created custom solutions for homes and businesses of all sizes; helping us to grow and develop into the very knowledgeable and versatile company we are today.


Melissa Brinkman, eldest daughter of Leigh J. Johnson, officially started her career in the security industry in December 1998. Since starting in the ‘family’ business in 1998, Melissa has held various positions within the company from marketing, to sales manager, business development director, and customer services manager. She was Chief Operating Officer before Leigh J. Johnson, founder and CEO at the time, announced his retirement and Melissa’s promotion to CEO in February 2014. In the 15 years leading up to her promotion she moved throughout various departments and was committed to learning as much as possible about the security industry and Custom Alarm; while focusing on taking care of the customer.

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Your Privacy Is Our Priority


What is doing business without privacy? It’s not business. At Custom Alarm we want you to understand that we greatly respect your privacy and we take pride in preserving the information that you have shared with us. Information that we collect is for communication and to ensure you have the best possible service. We will not share, sell, or otherwise distribute the financial or personal information of our customers. Should you have any questions or concerns regarding our privacy policy, please call us at 507.288.5522.

Named 2022 Dealer of the Year by SDM


Named Best Places to Work in Southeast Minnesota 7 consecutive years. 2017, 2018, 2019, 2020, 2021, 2022 & 2023. 


2022 Best Integrated Installation of the Year by Security Sales and Integration


Received the 2022 Project of the Year award by SDM


Named 2021 Distributor of the Year by Notifier


Named 2020 Installer of the Year (small to midsize company) by Security Sales and Integration


2020 Integrated Installation of the Year Runner-Up by Security Sales and Integration


Named Top 100 Security companies for over 25 years. 


Resideo 2019 Residential Installation of the Year Award 


Resideo Community Service Award for 5+ Years 

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Dealer of the Year 2022
Project of the Year 2022