Picking a commercial plumbing contractor in St. Louis is not the same as calling a residential plumber with a bigger truck. The wrong pick shows up as missed underground dates, failed inspections, and change orders nobody budgeted. Here is what to verify before you award the work.
1. Confirm licensing in the jurisdiction you're building in
St. Louis City, St. Louis County, St. Charles County, and Jefferson County each have their own permitting and inspection process. Ask which entity holds the master license, who pulls the permit, and whether the contractor has passed inspection in that jurisdiction recently. A contractor who routes permits through a third party adds a delay you will feel at rough-in.
2. Ask what they self-perform
Every scope that gets subbed out is a schedule handoff. Ask specifically about underground site utilities, medical gas, and process piping.
- Underground sanitary, storm, water service, and grease waste — is excavation in-house?
- Medical gas brazing — are the brazers ASSE 6010 certified on staff?
- Backflow certification testing — in-house or subbed?
- Camera inspection and jetting for existing buildings
3. Look at manpower, not just the bid number
A low number means nothing if the crew cannot be on site when the slab is ready. Ask how many journeymen the contractor can put on your job and where those people come from. Union signatory contractors in St. Louis can draw from UA Local 562 when a general contractor compresses the schedule; non-signatory shops are limited to who they already employ.
4. Read the bid for exclusions
The cheapest bid is usually the one with the most exclusions. Compare scope line by line: trenching and backfill, core drilling, fixture furnish versus install, temporary water, testing and certification documentation, and final inspection coordination. A clear bid that costs more is often the cheaper job.
5. Check the project history that matches your building
A contractor who builds warehouses is not automatically the right pick for a dental suite. Ask for St. Louis metro projects of similar type and size, and call the general contractor who ran them.
What to send when you request a bid
Drawings or a written scope, the target schedule, and the jurisdiction. That is enough for a real number. Legacy Plumbing returns commercial bids in the St. Louis metro within one business day.
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More Resources
- Why Design-Assist Preconstruction Saves Money on St. Louis Commercial Builds
Bringing a plumbing contractor in during design instead of at bid catches conflicts on paper. Here's what preconstruction involvement actually looks like on a St. Louis metro project.
- Commercial Plumbing Emergency? Here's What to Do First
Burst line, sewer backup, or water heater failure in your St. Louis building? The first fifteen minutes decide how expensive the day gets. Here's the order of operations.
- Tenant Build-Out Plumbing Timeline: What to Expect
A week-by-week look at commercial tenant build-out plumbing in the St. Louis metro — permitting, underground, rough-in, trim, and inspection — and where schedules usually slip.