Keystone Design Build

What this record tells you

Keystone Design Build holds Florida licence CMC1250822, a CMC classification which authorises work as a certified/registered air conditioning or mechanical contractor. A "C" prefix means the licence is certified — valid anywhere in Florida.

This licence was first issued in 2020, which makes it an established licence for the trade in this area. Roughly 66% of the 762 active hvac & ac repair licences based in the Jacksonville area were issued earlier than this one, and the local median sits at 2014. That is 6 years of continuous licensure.

Keystone Design Build is one of 430 active hvac & ac repair licences registered to an address in Jacksonville, so you have local alternatives to compare quotes against. Adis Dzinic additionally holds 1 other active Florida licence in our records, which can indicate a contractor qualified across more than one trade or entity.

The licence is recorded as expiring on 08/31/2028. Florida licences renew on a fixed cycle, and a licence that is not renewed moves to delinquent status — which is why the expiry date matters if you are planning work close to that date. Confirm the current status on the state portal before signing a contract.

Before you hire Keystone Design Build

• Re-check licence CMC1250822 on the DBPR portal — status can change any day.
• Ask for a current certificate of liability insurance and workers' compensation, issued to you directly by their insurer.
• Confirm the name on your contract matches Keystone Design Build or its qualifying agent, Adis Dzinic.
• Compare at least three written quotes from other hvac & ac repair contractors in Jacksonville.
• Confirm in writing that the contractor — not you — pulls the building permit.