# New Plumbing Systems > Commercial Plumbing System Installation; St. Louis metro; Domestic Water Distribution, Sanitary & Vent Systems. Canonical: https://legacyplumbingmo.com/facility-services/new-plumbing-systems Facility Services Legacy Plumbing installs complete plumbing systems for new commercial buildings, additions, and expansions across the St. Louis metro — underground rough-in through final trim, inspected and turned over on schedule. [Request a System Install Bid](https://legacyplumbingmo.com/contact-us) [636-978-0120](tel:+16369780120) ## Request a New System Bid Tell us about your project — we respond within one business day. What's Included ## What a Full System Install Includes One licensed contractor for every wet system in the building, coordinated with your GC's schedule and the local AHJ. ### Domestic Water Distribution Copper, PEX, and press-fit mains, risers, and branch piping sized to fixture-unit load with insulation and hangers to spec. ### Sanitary & Vent Systems Underslab and above-ground DWV in cast iron and PVC, tested and inspected before cover and again at top-out. ### Storm & Roof Drainage Roof drains, overflow, and interior storm leaders tied to site storm structures with proper slope and cleanouts. ### Natural Gas Piping Black iron and CSST gas distribution for boilers, water heaters, rooftop units, and kitchen equipment with pressure testing. ### Fixtures & Equipment Setting Commercial fixtures, carriers, water heaters, pumps, mixing valves, and specialty equipment set and started up. ### Testing, Inspection & Turnover Chlorination, pressure and hydrostatic testing, AHJ inspections, and O&M documentation delivered at closeout. Our Process ## How We Deliver a New System ### Takeoff & Bid We price from your plan set or design intent, flag long-lead fixtures, and identify value-engineering options up front. ### Coordination & Submittals Shop drawings, fixture submittals, and BIM coordination with mechanical, electrical, and structural before anything is fabricated. ### Underground & Rough-In Underslab DWV and water go in ahead of the pour, then above-ground rough-in sequenced against framing and drywall. ### Trim, Test & Close Out Fixtures set, systems tested and chlorinated, inspections passed, and a documented turnover package handed to ownership. ## New Plumbing System FAQ ### Do you install plumbing systems for additions to occupied buildings? Yes. We phase tie-ins and shutdowns around your operating hours so the existing building keeps water and drainage while the addition is built out. ### Can you work from design intent instead of a finished plan set? Yes. Our design/build team can develop the plumbing design, stamp it through an engineer of record, and carry it through permit and install. ### What areas do you install new systems in? The entire St. Louis metro — St. Charles, St. Louis City and County, Jefferson, Franklin, Lincoln, and Warren counties, plus a 2-hour radius from O'Fallon, MO. For examples of this work, see [Retail Plumbing in South St. Louis County (St. Louis, South St. Louis County)](https://legacyplumbingmo.com/projects/retail-building-plumbing-south-st-louis-county) , [Dental Office Renovation in St. Louis (St. Louis, City of St. Louis)](https://legacyplumbingmo.com/projects/dental-office-renovation-st-louis-city) and [Plant Cafeteria Plumbing in St. Louis (St. Louis, City of St. Louis)](https://legacyplumbingmo.com/projects/pharmaceutical-plant-cafeteria-renovation-st-louis) . For planning guidance, read [Tenant Build-Out Plumbing Timeline: What to Expect](https://legacyplumbingmo.com/resources/tenant-build-out-plumbing-timeline) . ### Related Services - [Ground-Up New Construction](https://legacyplumbingmo.com/services/new-construction) - [Design/Build & Preconstruction](https://legacyplumbingmo.com/commercial/design-build) - [Building Rehab & Repiping](https://legacyplumbingmo.com/facility-services/building-rehab-repiping) - [All Facility Services](https://legacyplumbingmo.com/residential) ### Next Steps - [Request Service](https://legacyplumbingmo.com/request-service) - [View All Commercial Services](https://legacyplumbingmo.com/commercial) - [Request a Free Estimate](https://legacyplumbingmo.com/contact-us) Serving the Greater St. Louis Area ## New Plumbing Systems Across the St. Louis Metro New plumbing systems have to satisfy whichever AHJ holds the permit — and in Greater St. Louis that changes block to block. We install to the adopted code in St. Louis City, St. Louis County, St. Charles County, and the Jefferson County municipalities every week. From a Chesterfield office core to a Wentzville warehouse and a Hazelwood clinic, our crews mobilize from O'Fallon and stay staffed through certificate of occupancy. Don't see your city below? We work the entire metro and a 2-hour radius from O'Fallon, MO. [View full service area →](https://legacyplumbingmo.com/service-areas) ### St. Charles County - [O'Fallon](https://legacyplumbingmo.com/locations/ofallon) - [St. Charles](https://legacyplumbingmo.com/locations/st-charles) - [St. Peters](https://legacyplumbingmo.com/locations/st-peters) - [Wentzville](https://legacyplumbingmo.com/locations/wentzville) - [Lake Saint Louis](https://legacyplumbingmo.com/service-area/lake-st-louis-mo) - [Dardenne Prairie](https://legacyplumbingmo.com/service-area/dardenne-prairie-mo) - [Cottleville](https://legacyplumbingmo.com/service-area/cottleville-mo) - [Weldon Spring](https://legacyplumbingmo.com/service-area/weldon-spring-mo) - [New Melle](https://legacyplumbingmo.com/service-area/new-melle-mo) - [Foristell](https://legacyplumbingmo.com/service-area/foristell-mo) ### Lincoln County - [Troy](https://legacyplumbingmo.com/service-area/troy-mo) - [Moscow Mills](https://legacyplumbingmo.com/service-area/moscow-mills-mo) - [Elsberry](https://legacyplumbingmo.com/service-area/elsberry-mo) - [Winfield](https://legacyplumbingmo.com/service-area/winfield-mo) - [Old Monroe](https://legacyplumbingmo.com/service-area/old-monroe-mo) - [Hawk Point](https://legacyplumbingmo.com/service-area/hawk-point-mo) - [Silex](https://legacyplumbingmo.com/service-area/silex-mo) ### Warren County - [Warrenton](https://legacyplumbingmo.com/service-area/warrenton-mo) - [Wright City](https://legacyplumbingmo.com/service-area/wright-city-mo) - [Marthasville](https://legacyplumbingmo.com/service-area/marthasville-mo) - [Innsbrook](https://legacyplumbingmo.com/service-area/innsbrook-mo) - [Truesdale](https://legacyplumbingmo.com/service-area/truesdale-mo) ### St. Louis County - [Affton](https://legacyplumbingmo.com/service-area/affton-mo) - [Clayton](https://legacyplumbingmo.com/locations/clayton) - [Ladue](https://legacyplumbingmo.com/service-area/ladue-mo) - [Brentwood](https://legacyplumbingmo.com/service-area/brentwood-mo) - [Chesterfield](https://legacyplumbingmo.com/locations/chesterfield) - [Crestwood](https://legacyplumbingmo.com/service-area/crestwood-mo) - [Des Peres](https://legacyplumbingmo.com/service-area/des-peres-mo) - [Fenton](https://legacyplumbingmo.com/service-area/fenton-mo) - [Lemay](https://legacyplumbingmo.com/service-area/lemay-mo) - [Maplewood](https://legacyplumbingmo.com/service-area/maplewood-mo) ### Jefferson County - [Arnold](https://legacyplumbingmo.com/service-area/arnold-mo) - [Festus](https://legacyplumbingmo.com/service-area/festus-mo) - [Crystal City](https://legacyplumbingmo.com/service-area/crystal-city-mo) - [Herculaneum](https://legacyplumbingmo.com/service-area/herculaneum-mo) - [Pevely](https://legacyplumbingmo.com/service-area/pevely-mo) - [De Soto](https://legacyplumbingmo.com/service-area/de-soto-mo) - [Hillsboro](https://legacyplumbingmo.com/service-area/hillsboro-mo) - [Barnhart](https://legacyplumbingmo.com/service-area/barnhart-mo) - [Imperial](https://legacyplumbingmo.com/service-area/imperial-mo) - [High Ridge](https://legacyplumbingmo.com/service-area/high-ridge-mo) ### St. Louis City - [Central West End](https://legacyplumbingmo.com/service-area/central-west-end-mo) - [Compton Heights](https://legacyplumbingmo.com/service-area/compton-heights-mo) - [Lafayette Square](https://legacyplumbingmo.com/service-area/lafayette-square-mo) - [Soulard](https://legacyplumbingmo.com/service-area/soulard-mo) - [Tower Grove South](https://legacyplumbingmo.com/service-area/tower-grove-south-mo) - [Shaw](https://legacyplumbingmo.com/service-area/shaw-mo) - [Benton Park](https://legacyplumbingmo.com/service-area/benton-park-mo) - [The Hill](https://legacyplumbingmo.com/service-area/the-hill-mo) - [Dogtown](https://legacyplumbingmo.com/service-area/dogtown-mo) - [South City](https://legacyplumbingmo.com/service-area/south-city-st-louis-mo) ## Planning a New Plumbing System in St. Louis? Send us your plans or design intent — we'll return a scoped, schedule-aware bid. [Get Free Estimate](https://legacyplumbingmo.com/contact-us) [636-978-0120](tel:+16369780120) ## 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)