Your Plumbing Partner From the First Sketch
Legacy Plumbing works alongside general contractors, developers and facility owners as a design-build partner — pricing, engineering and installing complex commercial plumbing systems from early design-assist through final inspection.
How We Work as Partners
Design-build replaces the old bid-then-build routine with one team responsible for both the design and the installation. You bring us in early; we stay through closeout. Here's what that looks like on your project.
Early involvement
We join your project during schematic design or earlier. Bring us a concept, a space plan or an unfinished set — we'll tell you what the plumbing scope really looks like.
Design-assist & budgeting
We model the systems, flag conflicts, price options at each design stage and help write the spec so the budget and the drawings never drift apart.
Coordination & submittals
Fixture selections, equipment cut sheets, shop drawings and routing are locked down before rough-in — so submittals don't stall the schedule.
Build, startup & closeout
We self-perform the install, test and commission the systems, and hand over complete closeout documentation. One contract, one team, one point of accountability.
Why Owners & GCs Choose Design-Build
Budget certainty, earlier
Pricing starts while the design is still on paper — not after it goes out to bid. You get real numbers from real install data at 30%, 60% and 90% drawings, so the budget holds.
Fewer surprises in the field
Our estimators and foremen review the drawings for routing, chase space, penetrations and conflicts before anything is built. Problems get solved on paper instead of on a change order.
A faster schedule
Long-lead equipment is identified early and rough-in starts on time because coordination happens during design. Design-assist removes weeks of back-and-forth between drawings and pricing.
One partner, end to end
The team that helps design your system is the team that installs it. No finger-pointing between designer and contractor — we own the result from concept to final inspection.
Value engineering that actually saves money
We propose alternatives with prices attached: piping materials, fixture packages, water heater sizing, trenching methods. You choose based on cost and long-term ownership, not guesswork.
Buildable from day one
Everything we recommend comes from field experience since 1996 — industrial plants, medical and dental offices, schools, restaurants and tenant finishes across the St. Louis metro.
Bring Us a Set of Drawings
Send us plans at any stage — even a preliminary set. We'll return a conceptual plumbing budget, constructability notes and a list of the decisions that will drive your cost, with no obligation.
Request a ReviewPlumbing Calculators
As part of our preconstruction partnership, we publish these calculators free of charge. Use them to get a head start on your budget, sanity-check a service call, size a water heater or stay on top of backflow testing — then send the result straight to our team to refine it into a real number.
Construction Budget Estimator
Conceptual plumbing budget for tenant finish and ground-up commercial work.
Open calculatorService Call Estimator
Typical price ranges for common commercial service and repair calls.
Open calculatorResidential Quote Builder
Homeowners: pick the job, materials and hours, then download a PDF quote.
Open calculatorWater Heater Sizing Calculator
Peak demand, storage and BTU input for your building type.
Open calculatorBackflow Compliance Checker
See when your annual backflow tests are due and what they typically cost.
Open calculatorNeed a Real Number?
Calculators give you a range. A design-build budget from our estimators gives you a number you can bank on.
Get a project budget