By Adrian Middleton, Sword & Shield, PLLC · Updated Friday, October 9, 2026
Class codes the Division applies to plumbers and mechanical contractors
| Code | Description | Note |
|---|---|---|
| 5183 | Plumbing NOC | Rated per $100 of payroll at the approved Florida rate |
| 5537 | HVAC and ductwork | Rated per $100 of payroll at the approved Florida rate |
The rate for each code is set in the annual NCCI Florida filing and applied per $100 of payroll. The penalty is two times that premium over the lookback period. Moving payroll from a high-rated field code to the correct code, or to a standard exception, is one of the most productive corrections in a penalty worksheet, and it requires records that show who did what.
Where plumbers and mechanical contractors go wrong
- Service technicians who are W-2 and installers who are 1099 is a common split that investigators treat as misclassification.
- Mechanical contractors with lapsed policies after a carrier audit are a frequent source of orders on insured companies.
- Duct fabrication in the shop (3076) is a non-construction code; shop payroll should not be rated as field installation.
Licensing
Certified and registered plumbing (CFC/RF) and mechanical/air conditioning (CMC/CAC/RMC/RAC) contractors are licensed under Chapter 489 and referred to DBPR under section 440.107(14).
The rule that decides most of these cases
Every dollar paid to a worker in the construction industry is uninsured payroll unless that worker held a valid exemption or was covered by a policy on the date of payment. A 1099, a contract, or a handshake agreement that someone is a subcontractor changes nothing (s. 440.02(18)(c)).
What to do if you were served
Stop all work at every site. Do not give the investigator records or a statement. Calendar 21 days from the order and 21 days from the records request. Get coverage. Then audit the records before anything is produced, because for many plumbers and mechanical contractors the choice between the records penalty and the imputed penalty is worth more than any later argument. The do's and don'ts and the penalty audit pages explain each step; the free calculator runs both numbers.
Questions
Are my 1099 plumbers and mechanical contractors really my employees?+
In the construction industry, yes, unless each holds a valid certificate of election to be exempt or is covered by a policy. Section 440.02(18)(c) makes independent contractors and subcontractors in construction employees of the contractor that pays them. The $5,000 per-worker penalty in section 440.107(7)(f) applies if you told the Department or your carrier they were independent contractors.
Will the Division tell DBPR?+
Yes. Section 440.107(14) requires the Department to immediately notify DBPR when a certified or registered contractor fails to secure coverage. That becomes a separate disciplinary case against the qualifier's license.
Can the class code be changed after the penalty is calculated?+
Yes, through records showing the actual work performed and, if needed, a petition under Chapter 120. Amended Orders of Penalty Assessment correcting class codes are common when the evidence supports it.