Commercial Building Repiping & Plumbing Rehab in St. Louis, MO
Legacy Plumbing handles commercial repiping and building rehab across the St. Louis metro, replacing aging galvanized water risers and corroded cast-iron waste and vent stacks as part of renovations, historic rehabs and adaptive reuse. We investigate the existing system and phase replacement around occupied floors, with new piping tested and inspected as work progresses.
Request a Repipe Bid
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Commercial Repiping: Galvanized & Cast-Iron Replacement
Phased so occupied floors keep service while the failing system comes out.
Domestic Water Repiping
Replacing galvanized and failing copper risers and branches with new copper or press-fit systems.
DWV Replacement
Removing corroded cast iron waste and vent stacks and reinstalling to current code with proper cleanouts.
Adaptive Reuse Conversions
New plumbing infrastructure for warehouse-to-office, church-to-retail, and industrial-to-residential conversions.
Historic-Sensitive Installation
Routing that respects original finishes, masonry, and preservation requirements in historic St. Louis buildings.
Riser & Stack Phasing
Floor-by-floor or stack-by-stack sequencing so tenants keep water and drainage through the project.
Code Upgrades at Renovation
Backflow protection, mixing valves, venting, and accessibility brought current when the walls are already open.
Phasing Commercial Repiping & Building Rehab
Investigate
Camera, cut-and-look, and pressure history to confirm what's failing before a scope gets written.
Plan the Phasing
A stack-by-stack sequence with shutdown windows and tenant notification built into the schedule.
Demo & Install
Old piping out, new risers and branches in, tested and inspected floor by floor.
Restore & Document
Access panels, patching, and as-builts so future service doesn't start with guesswork.
Commercial Repiping & Building Rehab FAQ
Can tenants stay in the building during a repipe?
Usually yes. We phase by stack or floor with scheduled shutdown windows, and most tenants only lose water for a few hours at a time.
How do you handle historic buildings?
We route around original finishes and masonry wherever possible and coordinate with preservation reviews when the project carries historic tax credits.
Do you repipe with copper or PEX?
It depends on the building, the water, and the spec. We install copper, press-fit copper, and PEX and will explain the trade-offs for your specific project.
For examples of this work, see Facility Water Heater & Backflow Program (Regional Portfolio) and Plant Cafeteria Plumbing in St. Louis (St. Louis, City of St. Louis). For planning guidance, read When a Commercial Plumbing Problem Can't Wait and Before the First Hard Freeze: A Plumbing Walk-Through for St. Louis Commercial Buildings.
Building Rehab & Repiping Across the St. Louis Metro
Adaptive reuse is everywhere in St. Louis — warehouse conversions downtown and in Soulard, storefront rehabs in Maplewood and University City, and school and church conversions across South City all inherit plumbing installed before the current code existed.
We repipe occupied and vacant buildings across St. Louis City, St. Louis County, including Valley Park, and St. Charles County, coordinating with each AHJ on renovation permitting.
Don't see your city below? We work the entire metro and a 2-hour radius from O'Fallon, MO. View full service area →
St. Charles County
Warren County
Rehabbing a Building in St. Louis?
We'll assess the existing system and phase the repipe around your schedule.
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