Reference the project size, building type, and scope of your plumbing work. 'Roughed-in plumbing for 12-story commercial office building, coordinating with mechanical and structural trades on 200,000 sq ft new construction project' conveys scale. Commercial plumbers working from engineered drawings should note blueprint and isometric drawing reading experience.

Backflow prevention testing certification, gas piping endorsements, and medical gas certification (for healthcare settings) are specialized credentials that may open doors to higher-paying or niche work. List each certification with the issuing body and expiration date. Specialty work commands higher rates and often has less competitive hiring markets.

If you've managed crews, estimated jobs, or handled customer service, include those responsibilities explicitly. 'Led crew of 4 plumbers on commercial new construction project, managing scheduling, material procurement, and daily progress reporting to general contractor' shows readiness for foreman-level responsibility.