• Featured Projects


    Pride of workmanship and delivering on our commitments defines each and every project we undertake. While winning industry awards is a satisfying achievement, what truly drives us is the knowledge that we’ve delivered above and beyond for our clients.

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  • Our Services


    With five specialized divisions, we offer a broad spectrum of services, including plumbing and HVAC repair and maintenance, sheet metal fabrication, large commercial mechanical systems installation and…

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  • Company Divisions:

    Warner Construction

    A "go-to" contractor in Frederick and the surrounding areas.

    Warner Mechanical

    A one stop shop for all mechanical services – plumbing, heating, ventilation, air-conditioning and fire protection.

    Warner Service

    Dependable plumbing and heating service since 1937.

    Kaempf and Harris

    A state-of-the-art, full-service sheet metal company offering exceptional craftsmanship.