Commercial Plumbing in St. Louis & St. Charles

Landmark Plumbing delivers dependable commercial plumbing services for businesses, restaurants, offices, and multi-unit properties in St. Louis and St. Charles County. We understand downtime costs money — we work efficiently, on schedule, and around your business hours.

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  • Licensed Master Plumbers
  • After-Hours Scheduling
  • Service Contracts Available

Our Approach

What Our Commercial Plumbing Service Includes

Every visit follows a thorough, professional process designed to solve your problem efficiently and leave your home or business in great shape.

  • Commercial Repairs

    Fast, professional repair of any commercial plumbing issue u2014 from restroom fixtures to main line breaks.

  • New Construction & Fit-outs

    Full rough-in and finish plumbing for new commercial builds, tenant improvements, and restaurant fit-outs.

  • Backflow Testing & Prevention

    Certified backflow testing, installation, and annual reporting to keep you compliant.

  • Preventive Maintenance Plans

    Scheduled service agreements that reduce emergency calls and keep your facility running smoothly.

We Solve This

Common Commercial Plumbing Problems We Fix

Not sure if your situation is serious? Here are the issues we handle most often — and how we fix them.

  • Problem

    High-traffic restroom failures

    Our Solution

    Commercial-grade fixture repair and replacement rated for heavy daily use.

  • Problem

    Grease trap blockages

    Our Solution

    Professional grease trap cleaning and maintenance for restaurants and food service.

  • Problem

    Water heater failures impacting operations

    Our Solution

    Emergency commercial water heater repair or replacement, including tankless systems.

  • Problem

    Backflow compliance violations

    Our Solution

    Certified testing and installation to meet St. Louis County municipal requirements.

Why Landmark Plumbing

The Right Team for Commercial Plumbing

  • Licensed & Insured

    Every technician holds a valid Missouri plumbing license. We carry full liability and workers' compensation insurance.

  • On-Time Every Time

    We respect your schedule. Arrive on time, communicate clearly, and finish the job without unnecessary delays.

  • Transparent Pricing

    You get a written estimate before work starts. The price we quote is the price you pay — no hidden fees.

  • Satisfaction Guaranteed

    If you're not completely satisfied with our work, we return and make it right — no questions asked.

Got Questions?

Frequently Asked Questions About Commercial Plumbing

Need a Commercial Plumber?

We work around your schedule to minimize disruption. Call now or request a quote for your business, restaurant, or multi-unit property.

  • Free, no-obligation estimates
  • Same-day appointments available
  • 24/7 emergency response

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