Where Michigan's plumbers are
Licensed plumbers cluster where the housing is. By total license records on file: Grand Rapids leads with 1,052, followed by Detroit (980), Kalamazoo (731), Lansing (693), Livonia (609), and Warren (597) — Warren's count is the highest of any Macomb County city and 6th statewide. Active licenses are far scarcer: 345 in Grand Rapids, 233 in Detroit, 197 in Warren. A 20-city Macomb County roll-up holds 2,504 records, 963 of them active. See the full city table in our Michigan Plumber License Statistics.
Why expiration dates matter to homeowners
Michigan plumbing licenses expire on April 30. In the July 2026 state pull, 1,945 licenses carried an April 30, 2026 expiration and had not been renewed, and 10,533 more come due on April 30, 2027 — the single largest renewal date in the dataset. A plumber who was licensed when you last hired them may be between renewals now. Hiring someone with a lapsed license can complicate permits, inspections, and insurance claims. The fix takes one minute: check the license at michigan.gov/lara before signing anything.
What the license classes mean
Michigan licenses plumbing work in classes. Master Plumbers — 3,929 active statewide — hold the senior credential associated with pulling permits; journeymen work under a master's supervision, and apprentices are in training. When you hire for permit-required work (water heaters, repipes, sewer repair), the company behind the quote should be operating under a master's license. Ask for the license number and verify it — reputable plumbers expect the question.
Frequently Asked Questions
How many plumbers are licensed in Michigan?
Michigan has issued 52,419 plumbing license records according to state LARA public records (pulled July 2026), but only 16,751 are currently active — about 32%. Active licenses break down as 5,699 apprentices, 4,210 journeymen, 3,929 master plumbers and 2,891 plumbing contractors. Across a 20-city Macomb County roll-up there are 2,504 records, 963 of them active.
When do Michigan plumber licenses expire?
Michigan plumbing licenses expire on April 30. In the July 2026 state pull, 1,945 licenses carried an April 30, 2026 expiration and had not been renewed, and 10,533 more come due on April 30, 2027 — the largest single renewal date in the dataset. Work by a lapsed license holder can complicate permits and insurance claims, so re-verify before hiring.
How do I verify a Michigan plumber license?
Use the license search at michigan.gov/lara and enter the plumber name or license number. Grade A Plumber also displays license numbers on plumber profiles where on file, so you can cross-check before requesting a quote.