• Integrated Security Solutions
Are you in need of a security system to keep a watchful eye on your business? Everyone deserves to work in a secure environment. Make sure your business is well-protected with the help of the security…


  • Line Voltage Solutions
Keeping an electrical system up and running is crucial for any business. However, general maintenance and preventative maintenance are often overlooked. That’s why if you’re looking for line voltage…

Data & Fiber

  • Structured Cabling & Fiber Optics
Are you searching for structured cabling and fiber optics solutions for your business? Developing a structured cabling system is conducive to the execution of various types of cable deployments…

Managed Services

  • IT Service Management
Looking for a technology partner committed to modernizing and safeguarding your business as it expands? Let us be your technological backbone…


Charles Strand

John Kerlin

Hamido El-Shafei


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Complex security did a great job installing NVR’s and security cameras at our company. Props to Hamido, Drew, and Charles for prompt and excellent product knowledge and customer service!

Samer Sultan

Very fast, quick and friendly service. Answers all your questions and makes you feel important. Great service overall!

AceCruz Valeriano Jr.

Could not be more impressed with the service offered by Complex Security Solutions. They are extremely professional, timely, and have excellent communication skills. I could not have felt more comfortable allowing them in my house to do a highly skilled job.  Overall, we had a wonderful experience with this company and would highly recommend them 10/10.

Brianne Lynn

Positive: Professionalism, Quality, Responsiveness, Value.

Ellen Del Vecchio

Great company! John and Charles are very professional. They came out to install a 3 camera system and Ring doorbell. The picture quality of the system is amazing. I highly recommend them to anyone in need of a security system!

Waiman Chan


We are located in SE Wisconsin and Madison, Wisconsin, serving Wisconsin, Illinois, and Indiana. Complex Security Solutions, Inc. was founded in 2015 by John Kerlin and Charles Strand.

7:00AM – 5:00PM (M-F)

7:00AM – 5:00PM (M-F)