Class Code 1711

Plumbing, Heating & Air-Conditioning

The legacy SIC code for mechanical contractors — still requested on some carrier, lender, and government forms even though NAICS replaced SIC in 1997.

Trades that use this code

Related codes

Classification varies by state and carrier — several states use independent bureaus, and carriers file their own GL codes. Confirm your fit with a licensed agent before relying on any code. 🤝

Written by the We Insure Things team — licensed independent insurance agents. Last reviewed July 13, 2026. General references: NCCI · NAICS (Census) · your state insurance department. Codes summarized in plain English; official classification language controls.