Lee Mechanical, originally founded as Lee Plumbing, was established by Bob Lee Sr. and Natalie Lee in the basement of their home. The company focused on plumbing projects often overlooked by larger contractors, building a reputation for reliability, craftsmanship, and customer service.

Ole Jensen and Bob Lee Jr. joined the business, expanding services to include plumbing for new home construction and remodeling projects.

The company began securing larger commercial and municipal work throughout southeastern Wisconsin, including projects associated with improvements at Petrifying Springs Golf Course in Kenosha, demonstrating its growing capabilities and reputation.

Bob Lee Jr. and Mike Lee assumed leadership of the company, with Bob serving as President and Mike as Vice President. During this period, the company secured a significant opportunity with AMC during its merger with Renault, helping establish Lee as a trusted industrial contractor.

Lee Plumbing continued expanding its commercial portfolio, earning contracts for public and municipal projects, including work associated with the Randall Fire Station in Bassett, Wisconsin.

The company’s reputation continued to grow throughout southeastern Wisconsin. Lee Plumbing was recognized as a full-service residential, commercial, and industrial contractor known for quality workmanship and exceptional customer service. That same year, Bob Lee’s leadership extended beyond the business community when he became General Manager of the Kenosha Twins professional baseball team, further strengthening the company’s connection to the community.

Lee Plumbing demonstrated its commitment to community investment by supporting local youth athletics and contributing to efforts to develop the Nash Park baseball complex in Kenosha.

As commercial development accelerated throughout Kenosha County, Lee Plumbing became a trusted partner on numerous commercial construction projects, helping support regional growth and development.

The company continued expanding its commercial presence, participating in major private-sector developments and securing public-sector contracts for for educational facility improvements, including work at Reuther Central High School.

During one of the wettest springs on record in southeastern Wisconsin, Lee Plumbing became a trusted local resource for drainage and sump pump solutions, helping homeowners and businesses protect their properties from flooding.

Lee Mechanical was selected for the Chrysler expansion project, marking a major milestone in the company’s involvement in large-scale industrial and manufacturing projects throughout Wisconsin.

Electrical services were added, allowing Lee Mechanical to provide integrated Mechanical, Electrical, and Plumbing (MEP) solutions through a single trusted partner.

Mike Lee departed the company, and Frank Ruffolo joined ownership, becoming an instrumental leader in growing and strengthening the company’s MEP capabilities.

Strategic discussions began regarding a company rebrand that would better reflect the organization’s growth and expanding service offerings.

Lee Mechanical opened its Oak Creek office and completed a rebranding initiative that reflected its evolution from a plumbing contractor into a full-service commercial and industrial systems provider.

The company consolidated operations into its Franklin headquarters, improving efficiency, enhancing customer service, and creating greater collaboration among teams.

In 2024, Lee Mechanical expanded its capabilities through the acquisition of Wisconsin Fire Sprinkler, adding a dedicated Fire Protection Division.

Lee Mechanical celebrated the grand opening of its Caledonia Fabrication & Logistics Facility at 4321 Carol Road. The facility significantly expanded fabrication capabilities, logistics operations, and support for projects throughout Wisconsin and the Midwest.