Mainstream Construction Corp

What this record tells you

Mainstream Construction Corp holds Florida licence CMC1249838, 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 2008, which makes it a long-held licence for the trade in this area. Roughly 45% of the 73 active hvac & ac repair licences based in the Key West & The Keys area were issued earlier than this one, and the local median sits at 2010. That is 18 years of continuous licensure.

Mainstream Construction Corp is one of 11 active hvac & ac repair licences registered to an address in Tavernier, so you have local alternatives to compare quotes against. Sergio Rubio additionally holds 2 other active Florida licences 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 Mainstream Construction Corp

• Re-check licence CMC1249838 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 Mainstream Construction Corp or its qualifying agent, Sergio Rubio.
• Compare at least three written quotes from other hvac & ac repair contractors in Key West & The Keys.
• Confirm in writing that the contractor — not you — pulls the building permit.