B. F. Mahn & Sons De Soto MO

Business Overview

B. F. Mahn & Sons De Soto MO is a family-owned plumbing and HVAC contractor with more than 150 years of service in Jefferson County and the St. Louis area. The company serves both residential and commercial clients, offering routine maintenance, remodel plumbing, and emergency repairs. Emergency service is available for urgent plumbing and heating issues, and licensed, bonded, and insured technicians handle each job.

Teams include experienced plumbers and HVAC techs who work on jobs ranging from small faucet repairs to full HVAC replacements. Complimentary estimates are provided for major plumbing repairs and HVAC installations.

Key Services

Work is organized around plumbing, heating and cooling, and water heating. Common services include:

• Plumbing repair and installation: sinks, toilets, bathtubs, showers, faucets, and pipes.
• Drain and sewer work: drain installation and repair, sewer installation and service.
• Gas lines: installation and repair for appliances and heaters.
• Water heaters: installation, repair, and hot water recirculation pump service.
• HVAC: installation or replacement, repairs, and seasonal maintenance.
• Inspections and remodel plumbing for new construction or renovations.

Areas Served

The company serves a wide area across eastern Missouri and nearby Illinois towns. Primary markets include Saint Louis, Chesterfield, Oakville, Wildwood, Ballwin, Mehlville, Kirkwood, Webster Groves, Affton, Arnold, Farmington, Manchester, Concord, Festus, Crestwood, Eureka, Ellisville, Murphy, and many others across Jefferson County and beyond.

Company History

Founded more than 150 years ago, B. F. Mahn & Sons began as a small local shop and grew through generations of hands-on work. The business stayed family-run, adding skills for new heating and cooling technology while keeping old-school plumbing know-how for the region’s older homes.

The company weathered economic ups and downs and is known locally for reliable scheduling, accurate estimates, and practical solutions suited to both older brick houses and newer suburban construction in the area.

Leadership

Owner Biff Mahn started in the trade as a child, learning by helping crews in crawl spaces and on job sites. He became a paid apprentice in high school and built a career on practical experience and on-site problem solving. His presence keeps the business connected to the local community and to tradespeople across Jefferson County.

Specialties & Highlights

• Six generations of family ownership with deep local roots.
• Licensed, bonded, and insured technicians.
• Free estimates for major plumbing and HVAC projects.
• Both residential and commercial service, including remodel plumbing and new construction.

Why Locals Choose B. F. Mahn & Sons

B. F. Mahn & Sons De Soto MO has a long history in the region and a practical approach to common St. Louis area issues like winter freezes, humid-summer cooling demands, and aging water systems in older homes. The company is recommended for people who want experienced technicians, clear estimates, and steady follow-through on repairs and installations.

Hours are Monday–Friday, 8:00 AM–4:00 PM, with emergency response for urgent needs. For plumbing, heating, and water heater work across Jefferson County, the business remains a known local choice.