M&M Crane and Heavy Equipment Leading Multi-Trades Mechanical Contractor M&M Welding is your one stop shop for all your mechanical construction needs Our Services welding services at M&M welding 24/7 Emergency Service Any time of the day or night, our team of experienced professionals are only a phone call away Contact Us See Our Latest Work We have a long history of quality work product and satisfied customers. See what we've been up to lately Clients

Mechanical Contractors & Welding Services

Trusted for Over 45 Years in MD, VA, and DC

M&M Welding and Fabricators, Inc. have been providing all phases of mechanical construction for the past 45+ years to the Maryland, Virginia, and Washington, DC areas. We are a complete turnkey, woman-owned, and MDOT Certified Multi-Trade Mechanical Contracting Company that has proudly served its clients since April of 1972. From professional mechanical contracting to quality welding services, we have you covered.

Trust us for all mechanical contracting needs. With 45+ years of success in the industry, we can complete your large or small job with reliability, efficiency, and unbeatable expertise. You can trust us to work to the highest levels of mechanical contracting standards and ethics — we are on time, on budget, and the top experts in our field.

Some of Our Mechanical Contracting Services at a Glance

Repairs, installations, rentals, re-tubings, and more are all included in the boiler services we offer to our clients.

We are R-Stamp Certified and are experienced with steam boilers, hot water boilers, boiler tubes, and more.

If you are undergoing an expansion, shut down, or more, we have boiler rentals to help you along. Our rentals range in size from 220,000 pounds per hour industrial steam boilers to 100 horsepower apartment heating units.

M&M Welding and Fabricators is the go-to installation contractor for several of the largest, most reputable chiller manufacturers in the DC Metro area.

M&M specializes in the retro-fit market for water-cooled, centrifugal, and air-cooled chillers.

We also perform new installations, repairs, maintenance, and rentals as part of our industrial chiller services.

We provide services for all varieties of cooling towers, including water cooling towers, power plant cooling towers, evaporative cooling towers, and more.

Repairs install, and protective maintenance are all part of our promise to you to keep your cooling tower functioning like new.

Trust the experts. We make sure you are in good hands.

The professional welding services we provide at M&M Welding and Fabricators are in compliance with all ASME code quality control standards, and our employees are annually trained in the top safety practices.

We work with carbon steel, stainless steel, aluminum welding, and more on industrial welding jobs.

We are R-Stamp Certified and offer custom fabrications, including catwalks, deck grating, ladders, steps, and more. When you need to be trusted, professional mechanical contractors and welders, give us a call.

For your commercial HVAC systems, whether they utilize boilers, cooling towers, chillers, or other systems, we have you covered.

Our Commercial HVAC services include installations, comprehensive preventive maintenance, rentals, repairs, retrofitting, and more.

No job is ever too complex for us — we show up on time and complete each HVAC service with unbeatable skill and workmanship to keep all your commercial HVAC systems running properly for years to come.

M&M Welding and Fabricators specialize in the installation of new underground HVAC distribution piping as well as the maintenance of existing underground distribution systems.

We work on underground steam and condensate systems, high-temperature hot water, chilled water, and domestic hot water.

M&M Welding and Fabricators has been performing these services at apartment complexes, universities, and various Federal and State government campuses in the greater Washington, DC area for over 45 years.

M&M Welding and Fabricators has a complete fire protection division specializing in the installation, repair, and replacement of dry and wet standpipe systems.

M&M holds NICET Level III Certification and is a member of NFPA.

Unlike most mechanical contractors, M&M Welding has its own insulation division, allowing our company to self-perform pipe and mechanical equipment insulation, along with boiler refractory.

This self-performed service eliminates the need for an insulation subcontractor, giving M&M even better control of its projects.

M&M Welding and Fabricators provides various rentals to commercial properties and companies throughout Maryland and DC.

When you’re in need of a boiler or chiller, contact us to inquire about how we can help you stay running.

Boiler rentals range in size from 220,000 pounds per hour industrial steam boilers to 100 horsepower apartment heating units. If you’re undergoing a shutdown or other maintenance, get in touch to stay at full operating power.

Contact us now for a free quote on your project


“R” Repair Stamp | “PP” Pressure Piping | “H” Heating Boilers | “S” Assembly of Power Boilers | “U” Pressure Vessels.

Minority Certifications

Maryland Department of Transportation (MDOT MBE 03-386) | Washington Metropolitan Area Transit Authority (WMATA DBE 786) | Prince Georges County Government (11-7619) | Prince George's County Public Schools (811)

Commercial Mechanical Contractors & Professional Welding Services Near You

All heating and cooling needs are covered by the experienced employees at M&M Welding and Fabricators. We are ASME-certified multi-trade mechanical contractors offering professional HVAC service, welding servicescommercial HVAC services, and more.

M&M Welding and Fabricators is known as one of the best welding companies in the metro DC area. We provide ASME-code, X-ray, and R Stamp Welding or various other welding services. The majority of our employees have been part of our company for over a decade, both in the field and in the office. Some of our crew have been around for over three decades with M&M Welding and Fabricators.

We own, operate, and service our own fleet of construction equipment, including crane trucks, backhoes, skid steers, and dump trucks. We can supply the tools, experience, and equipment needed for any job.

Get In Touch With Us Today

Our operations team shares decades of experience in mechanical construction, and we are prepared to put that experience and problem-solving ability to use for you. You can expect prompt, competent answers and responses to any inquiries you have. With multiple in-house teams, we have members who know exactly what you need and can serve you without delay.

We haven’t been one of the most requested commercial mechanical contractors for highly complex jobs by coincidence — we’ve proven ourselves time and time again with the right attitude, the right approach, and the right results. Get in touch with M&M today – your mechanical contractors and industrial welders of choice.