Bid-Spec Plumbing Contractor in St. Louis, MO
Your engineer's drawings, our installation. Legacy Plumbing hard-bids plan-and-spec commercial and industrial plumbing across the St. Louis metro — then self-performs the work with UA Local 562 crews.
Invite Us to Bid
Tell us about your project — we respond within one business day.
Engineered drawings, built right.
We provide competitive bids and complete installation from engineered plans for new construction, additions, and tenant finish. Our estimating is detailed and our field crews are experienced, backed by trained union labor, clean submittals, and on-time closeout documentation.
Request a BidProject types
- Commercial
- Industrial
- Healthcare
- Education
- Retail/restaurant TI
What Our St. Louis Estimating & Field Teams Deliver
A complete plan-and-spec scope — takeoff through closeout — from one self-performing subcontractor.
Plan & Spec Takeoff
Full quantity takeoff from your engineer's drawings — fixtures, carriers, waste, vent, domestic water, and gas.
View Plan & Spec Takeoff detailsHard-Bid Pricing
A complete, scope-clear bid with inclusions and exclusions spelled out so there are no surprise change orders.
View Hard-Bid Pricing detailsConstructability Review
We flag conflicts, missing details, and long-lead items during the bid window instead of during rough-in.
View Constructability Review detailsShop Drawings & Submittals
Fixture submittals, coordination drawings, and spool sheets turned around fast to keep procurement moving.
View Shop Drawings & Submittals detailsSelf-Performed Install
Underground, rough-in, top-out, and trim-out installed by our own UA Local 562 crews — not brokered out.
View Self-Performed Install detailsTesting, Inspection & Closeout
Pressure tests, AHJ inspections, backflow certification, as-builts, and O&M manuals at turnover.
View Testing, Inspection & Closeout details
A Hard Number You Can Carry Into Your Own Bid
General contractors keep Legacy on their bid list because our proposals are complete. We read the specs, ask the questions during the bid window, and price the job we intend to build — then we show up with our own manpower and equipment to build it.
- Bids returned complete — no phantom exclusions
- In-house excavation for underground scope
- O'Fallon prefab shop feeding the field
- UA Local 562 manpower you can schedule
- Missouri & Illinois AHJ inspection experience
- Change orders priced off the same takeoff
How a Plan-and-Spec Bid Moves Through Our O'Fallon Office
- 01
Bid Documents In
Send plans, specs, addenda, and the bid date. We confirm scope and schedule within one business day.
- 02
Takeoff & RFIs
Quantified takeoff plus written questions on anything ambiguous before the number goes in.
- 03
Scope-Clear Proposal
A hard number with clear inclusions, exclusions, alternates, and unit pricing for adds.
- 04
Award & Install
Submittals, procurement, and self-performed installation sequenced to the GC's schedule.
Choosing the Right Delivery Method for Your St. Louis Project
Bid-Spec (Plan & Spec)
The design is complete and competitively bid. Best when the engineer's drawings are fully developed, the budget is fixed, and the owner wants apples-to-apples pricing.
Design/Build & Design-Assist
We join at concept, model the system in BIM, and value engineer before drawings lock. Best for fast-track schedules and complex industrial or healthcare systems. See design/build →
Project Types We Hard-Bid
- Healthcare & dental
- Industrial & warehouse
- K-12 and higher education
- Office & medium commercial
- Municipal & prevailing wage
- Hospitality & special projects
Request a Bid
Tell us about your project — we respond within one business day.
St. Louis Bid-Spec Plumbing — FAQs
- What is a bid-spec (plan and spec) plumbing project?
- Bid-spec means the architect and engineer have already designed the plumbing system. Our role is to price those drawings, then furnish and install the system exactly as specified — coordinating with the general contractor and the other trades to hold schedule and pass inspection.
- How do I get Legacy Plumbing on a St. Louis bid list?
- Send the plans, specs, addenda, and bid date to our estimating team or call 636-978-0120. We bid commercial and industrial plumbing across the St. Louis metro and within a two-hour radius of O'Fallon, MO.
- How much lead time do you need to bid a project?
- Two weeks is comfortable for a mid-size commercial project. We regularly turn around smaller bids faster, and we will tell you honestly if a date is too tight to price responsibly.
- Do you self-perform the underground scope on plan-and-spec work?
- Yes. We own our excavation equipment and self-perform sanitary, storm, domestic water, and fire service from the main into the building, so that scope stays on our schedule instead of a second sub's.
- How are change orders handled on a hard-bid job?
- Changes are priced off the same takeoff and unit rates used in the original bid, submitted in writing with labor and material broken out for your review before we proceed.
Our Process
- 01
Preconstruction
Review drawings, site conditions and schedule with your team.
- 02
Design / Estimating
Size systems, value-engineer and deliver a clear, written number.
- 03
Submittals
Fixture, equipment and material submittals approved before ordering.
- 04
Rough-In
Underground and above-ground piping installed, tested and inspected.
- 05
Trim & Startup
Fixtures and equipment set, water heaters started and balanced.
- 06
Closeout
Final inspection, O&M manuals, as-builts and warranty handoff.
Bid-Spec Plumbing Across the St. Louis Metro
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
Have Plans Out for Bid?
Send the drawings and bid date to our O'Fallon estimating team — we bid commercial and industrial plumbing across the St. Louis metro and a 2-hour radius.