Access Control Systems

Save Money. Create audit trails & secure areas. Make changes with ease. From one door to large commercial projects. Read more ...

Video Surveillance Systems

Reduce theft and vandalism, as well as your own liability. Let us advise you on issues such as upgrading to IP/Megapixel. Read more ...

Locksmith Services

We handle large commercial projects such as fit-ups and new construction, as well as residential re-keys and lock changes. Read more ...

Burglar & Fire Alarm Systems

Secure your home or business with complete burglar and fire alarm monitoring systems, including environmental monitoring. Read more ... 

At One Source Security, we don't require your home or business to fit our systems. We build a system to fit your situation. Using state of the art equipment, we custom design a security system to meet your needs.

Kara Doberstein


" What a wonderful experience. I needed to have the front locks and door knobs on my front door replaced. Within 24 hours of calling, Paul came over and surpassed my expectations. He made sure he had all the correct hardware that would match the preexisting pieces we would leave in place. He went the extra mile to make sure that the hardware was not only functional, but he also cleaned up our old deadbolt that had years of old paint on it. He was cheerful, courteous, and meticulous. Thank you Paul! I will strongly recommend your services to my friends and family.."

Kara Doberstein 

What our Customers have to say

Merrimack Chamber of Commerce
Associated Locksmith of America
New Hampshire Alarm Association
Massachusetts Systems Contractors Association
 American Society for Industrial Security National Fire Protection Association
 Souhegan Valley Chamber of Commerce

Expert Security Systems integration for New England

There's little difference in the actual equipment from one security system to the next.  What truly distinguishes a security system is how it's designed... how it's implemented... and how it's serviced.

One Source Security 

Our Address: 446 Daniel Webster Highway
                        Merrimack, NH 03054

Hours of Operation:
                        Mon. to Fri. 8am to 5pm

Contact us:      800.570.6478