Commercial Plumbing in Affton, MO
Unincorporated Affton gets plumbing permits from St. Louis County, which requires county-licensed contractors. Legacy Plumbing serves Affton with commercial plumbing and select residential service. Affton is unincorporated, with commercial plumbing scope and inspection planning confirmed for each property.
Free Estimate — Affton
Same-business-day response from our O'Fallon office.
Who permits plumbing work in Affton
Public facts from government and utility sources, not Legacy Plumbing project claims.
- Affton is unincorporated, so St. Louis County Transportation & Public Works issues all building, plumbing and occupancy permits; it issues plumbing permits only to contractors holding active St. Louis County licenses. St. Louis County Transportation & Public Works
- Missouri American Water replaced nearly 8,000 ft of 1930s cast-iron main with 12- and 16-inch ductile iron on Gravois Rd, New Hampshire Ave and Weber Rd in Affton. Missouri American Water
- MSD's Lemay No. 3 Pump Station and Force Main project will replace undersized sanitary sewers in Affton with a 15 MGD pump station about 170 ft deep and about 2,750 ft of new 8- to 36-inch sewer. MSD Project Clear
Public sources checked 2026-10-30
Commercial plumbing services in Affton
Tenant improvement & build-out
Suite plumbing scheduled ahead of Affton's occupancy inspection for a new tenant.
Explore tenant improvement & build-outService & repair
Scheduled drain, lateral and water heater repairs in Affton, where MSD has worked on undersized sewers.
Explore service & repairBackflow install & testing
Annual testing and assembly replacement for Affton buildings.
Explore backflow install & testingScheduling commercial plumbing in Affton
Affton sits in St. Louis County, MO, roughly 27 straight-line miles from our O'Fallon shop; the closest towns we also serve are Lemay (about 3 mi), Mehlville (about 3 mi) and Crestwood (about 3 mi). Legacy Plumbing has worked as a UA Local 562 signatory commercial plumbing contractor in St. Louis since 1996, and the St. Louis plumbing hub covers the wider area.
Licensed to pull plumbing permits in Affton
Legacy Plumbing has master plumbers on staff and holds the licensing to pull plumbing permits in St. Louis County, as in every other St. Louis–area jurisdiction we serve — St. Louis City, St. Louis County and its municipalities, St. Charles County and Jefferson County.
Legacy Plumbing projects in and near Affton
Our closest documented work to Affton is in Crestwood, Webster Groves, Richmond Heights, St. Louis, within about 9 straight-line miles — restaurant build-out, dental office in an occupied building, dental surgical center and plant cafeteria and restroom renovation. Distances are straight-line between town centers.
- Near Affton — Crestwood, ~3 mi
Restaurant build-out (2025)
Crestwood
Kitchen drainage, grease interception and water heating for a new restaurant space, plus restroom fixtures and permits within the same interior package.
View project scope - Near Affton — Webster Groves, ~4 mi
Dental office in an occupied building (2026)
Webster Groves
Dental build-out with four water closets, four wall-hung lavatories and a 40-gallon water heater, worked around occupied space below.
View project scope - Near Affton — Richmond Heights, ~6 mi
Dental surgical center (2024)
Richmond Heights
Clinical plumbing with plaster traps, 12 floor drains, hub drains and cleanouts, plus a grinder lift station and sump pump.
View project scope - Near Affton — St. Louis, ~9 mi
Plant cafeteria and restroom renovation (2025)
St. Louis
Renovation scope with 5 water closets, 7 lavatories, 4 showers, a bottle-filling fountain and a recirculating electric water heater with an RPZ.
View project scope
Affton Plumbing Questions
- How do you confirm utility and permit requirements in Affton?
- For an unincorporated Affton property, check your water bill to identify the provider and share the address and scope with us. We confirm the permit and inspection requirements for that property before work begins.
- Who issues commercial plumbing permits in Affton?
- Affton is unincorporated, so St. Louis County Transportation & Public Works issues all building, plumbing and occupancy permits; it issues plumbing permits only to contractors holding active St. Louis County licenses.
Nearby areas we serve
Need a Plumber in Affton?
Call 636-978-0120 or request your free estimate — we respond same business day across St. Louis County.