# Plumbing FAQ > Answers to common commercial plumbing questions in St. Louis — service hours, licensing, service area, medical gas and free bids. Still curious? Call us. Canonical: https://legacyplumbingmo.com/faq Last updated: 2026-10-29 ## Hiring a Commercial Plumber in St. Louis ### Do you only work on commercial buildings? Mostly. Legacy Plumbing is primarily a commercial plumbing contractor, building and servicing plumbing for commercial, institutional and industrial buildings across the St. Louis metro since 1996. Our service division also handles select residential service — repairs, water heaters, drains, and gas lines. ### Who is a good commercial plumbing contractor in St. Louis? Legacy Plumbing is a union commercial plumbing contractor based in O'Fallon, MO, serving the St. Louis metro since 1996 with UA Local 562 crews. We handle design-build, design-assist and plan & spec projects, from $500 service calls to $5,000,000 builds, and return bids within one business day. ### Who is the best commercial plumber near me in St. Louis? Legacy Plumbing is primarily a commercial plumbing contractor, and our service division also handles select residential service — repairs, water heaters, drains, and gas lines. We serve St. Louis City, St. Louis County, St. Charles County, and Jefferson County from our O'Fallon, MO shop. We have built commercial and industrial plumbing systems since 1996, and every job runs under master-licensed supervision with UA Local 562 crews. The best way to compare us is to send drawings or a scope — we return a written bid within one business day. ### What makes Legacy Plumbing different from a residential plumbing company? We are primarily a commercial contractor since 1996, with select residential service through our service division. Our crews build commercial and industrial plumbing across the St. Louis metro full time. That means underground site utilities, medical gas, and multi-story rough-in are routine rather than an occasional job. General contractors and facility managers get a project manager and a written pre-job plan, not a dispatcher. ### Do you provide free estimates for commercial plumbing in St. Louis? Yes. Bid requests and commercial estimates in the St. Louis metro are free and carry no obligation. If you would rather skip the estimate and get moving, we can also begin work on a time-and-material basis. ## Service, Response Time & Availability ### Do you offer after-hours or emergency commercial plumbing? No — we do not staff an overnight on-call crew, and we would rather tell you that than leave you waiting on a phone tree. Legacy Plumbing schedules commercial service across the St. Louis metro from 7am–4pm Mon–Fri. Call 636-978-0120 and we will get you on the board for the earliest window we have. ### How fast can you respond to a commercial plumbing emergency? For urgent commercial calls in St. Louis, St. Charles, and Jefferson County we aim for same-day response during our 7am–4pm service hours. Our service trucks are stocked for the common failures — burst lines, sewer backups, water heater failures, and gas leaks — so the first visit is usually the repair visit. Buildings on a maintenance agreement get priority scheduling. ### Do you offer scheduled or preventive commercial plumbing maintenance? Yes. We set up recurring maintenance for facilities across the St. Louis metro, including drain and grease trap cleaning, backflow certification, water heater service, and camera inspection. Documented service history stays on file so the next technician is not starting from scratch on your building. ## Hours, Residential Work & Bidding ### What are your service hours? Our office and service crews work Monday–Friday, 7:00 AM – 4:00 PM, and we are closed Saturday and Sunday. We do not staff an overnight on-call crew. Call 636-978-0120 during business hours to schedule service. ### Do you do residential plumbing? Yes, on a select basis. Legacy Plumbing is primarily a commercial contractor since 1996, and our service division also handles select residential service — repairs, water heaters, drains, and gas lines. ### How do I send a project for bid? Use the project bid request form on our Contact page or call 636-978-0120. A Legacy estimator reads your scope within one business day, and bid requests are free with no obligation. ## Service Area & Licensing ### What areas do you serve? Legacy Plumbing serves the entire St. Louis metro from our O'Fallon, MO office — St. Louis City and County, St. Charles County, Jefferson County, plus Lincoln and Warren counties. That includes O'Fallon, St. Charles, St. Peters, Wentzville, Chesterfield, Arnold, and the surrounding communities within about a two-hour radius. If your building is near that line, call and we will tell you honestly whether we can cover it. ### Are your plumbers licensed in St. Louis City and County? Yes. Legacy Plumbing has master plumbers on staff and holds the licensing to pull plumbing permits in the City of St. Louis, St. Louis County and its municipalities, and every other St. Louis–area jurisdiction we serve, including St. Charles County and Jefferson County. We file the permits ourselves, and we are bonded and insured for commercial and industrial scopes. ### Are you a union plumbing contractor? Yes — Legacy Plumbing is a signatory contractor with UA Local 562 in St. Louis. That gives us trained journeymen and the ability to add manpower quickly when a general contractor compresses the schedule. ## Services & Capabilities ### Do you handle medical gas plumbing installation? Yes. We install, repair, and test medical gas systems for hospitals, surgical centers, dental offices, and veterinary clinics throughout the St. Louis metro. Our brazers are ASSE 6010 certified, the piping is installed under nitrogen purge to NFPA 99, and we coordinate the third-party ASSE 6030 verifier and hand over the documentation your compliance file needs. ### Do you self-perform underground and site utilities? Yes. Sanitary, storm, domestic water service, and grease waste underground are self-performed with our own excavation equipment on commercial sites across St. Louis and St. Charles County. Keeping that scope in-house means the underground is coordinated with the slab schedule instead of subbed out and hoped for. ### Can you do a commercial tenant build-out in an occupied building? Yes. Tenant build-outs in occupied St. Louis and St. Charles County buildings are a large part of our work — dental and medical suites, office floors, and light industrial conversions. Water shutdowns are scheduled with the building engineer in advance, and we work around tenant hours when the property requires it. ### Do you install and certify backflow preventers in Missouri? Yes. We install, repair, and provide annual certification testing for RPZ and DCVA backflow assemblies throughout the St. Louis metro. Test reports are filed with the local water purveyor so your property stays compliant. ### Do you work with general contractors on design-build and preconstruction? Yes. We join St. Louis metro projects during design to budget the plumbing scope, review constructability, and price value-engineering alternates before drawings lock. The same estimators and field leadership stay on the job through final inspection. ## Related - [Contact Legacy Plumbing](https://legacyplumbingmo.com/contact-us) - [Company facts](https://legacyplumbingmo.com/company-facts) - [All pages (llms.txt)](https://legacyplumbingmo.com/llms.txt)