Hiring a plumber in Nashville: the master plumber's certificate, the permit, and what 27,000 plumbing permits show

Nashville plumbing in numbers

Filing peaks in June (index 114) and is lowest in December (87). Prices by job are on the Nashville plumbing cost page.

Which license a Nashville plumber needs

Metro Codes' Mechanical, Plumbing, Electrical Examiners & Appeals Board examines and issues master, journeyman and apprentice plumber's certificates (Metro Codes, read 22 October 2026). The master's certificate is what the trade permit is pulled under, so the name to ask for is the master plumber's, not only the company's.

Tennessee adds a state license by dollar amount: plumbing subcontractors need their own license (CMC-A) when their part is "$25,000 or more", and in Davidson County residential jobs from $3,000 to $24,999 need a home improvement license (Board for Licensing Contractors, read 22 October 2026). Most plumbing jobs stay under $25,000 (the middle half of Nashville plumbers file between $5,000 and $25,000); a whole-house repipe or a new-build rough-in may not.

The five-minute check: search the business or license number on verify.tn.gov and read the status and monetary limit, then call Metro Codes on 615-862-6500 to confirm the master plumber's certificate. The full table of Nashville licenses is in the Nashville contractor license lookup.

The permit rule for plumbing in Nashville

Plumbing is a Metro trade permit. Metro says "Only licensed contractors with an e-permit account can apply for a trade permit using our online system"; anyone else applies in person, and the examiners board tests homeowners before issuing a homeowner permit (Metro Codes, read 22 October 2026). Which repairs need no permit varies by city; the rules in 13 cities are in do I need a permit for plumbing repairs. After booking, search your address on Metro's Parcel Viewer and open Permit History: the plumbing permit should name your plumber.

Red flags in the Nashville record

• A finished share under 72.1%. That is the 10th-percentile line among the 214 plumbers with 10 or more Nashville permits; 16 finish under 70%. A plumbing permit without a final means work no Metro inspector has signed off.
• No master plumber named. 47.5% of plumbing firms had no state license match by name, often because their jobs stay under $25,000. The Metro certificate is then the only license check, so get the name.
• A firm that went quiet. 43 plumbing firms with 5 or more permits filed none in the last 12 months.
• A single-permit history. 191 firms (30.3%) filed exactly one plumbing permit in three years; there is little to read.
• A request that you pull a homeowner permit for work the plumber is doing.

The busiest Nashville plumbers in the last 12 months

Ranked by Nashville plumbing permits in the last 12 months of the window. Volume, not quality: a firm that does a lot of new-construction rough-ins can top this list without doing much repair work.

The busiest firm alone holds 12.1% of the city's plumbing permits and the top five 26.4%. The compare list puts each firm's finished share and license match beside its volume.

See every Nashville plumber by finished share and license match →

What the Nashville record does not tell you

A final means Metro's inspector passed the work; it does not grade the price or the cleanup. We have no days-to-final figure for Nashville, so ask when the inspection is booked. The license match is by business name to the state file; we do not hold Metro's plumber certificates, so unmatched is not unlicensed. Drain cleaning and fixture repairs that need no permit leave no record. The national checklist is in hiring a plumber, and when a handyman will do in plumber vs handyman.