Class code 5183 is the home code for plumbing — installation, service, and repair work including gas fitting in most states. It’s a meaningful rate class, which makes classification accuracy and payroll splits genuinely valuable to plumbing contractors. Get multiple quotes within minutes.

Who falls under code 5183

Plumbers and helpers performing installation, service, and repair of plumbing systems. Related but distinct: sprinkler installation, sewer construction, and HVAC work each carry their own codes — crossover crews need documented payroll splits.

The misclassification traps

• HVAC or sprinkler work absorbed into 5183 instead of split to its own class
• Clerical and estimating staff not separated into office codes despite qualifying
• Subcontractors without certificates absorbed into your payroll at audit — the classic contractor comp surprise

What drives your 5183 premium

Payroll in the class, your experience mod, state rates for 5183, and carrier appetite — which varies more for this class than owners expect. Plumbing’s rates make the office-payroll split worth doing right — qualifying clerical staff in the office class instead of 5183 is real money. The fix for all of it is the same: accurate payroll split by class, clean documentation, and multiple carriers quoted side by side. See our full class code directory.

Frequently asked questions

What is workers’ comp class code 5183?

Code 5183 covers plumbing installation, service, and repair — including gas fitting in most states. Crews doing HVAC or sprinkler work may qualify for separate codes with documented payroll splits, and uninsured subcontractors get charged to your policy at audit.

Can one business have code 5183 and other class codes?

Yes — most businesses carry multiple class codes with payroll split among them. The rules for when payroll can be divided are strict and state-specific, which is exactly where a comp-focused agency earns its keep at audit time.

Think you’re misclassified — or overpaying? We review classifications as part of every quote. Get multiple quotes within minutes.