McGowan Building Company is owned and operated by Matt McGowan, a native of Gaithersburg who was born to build. Our Handyman Potomac services include home remodeling, home renovation, Rockville bathroom remodeling, Bethesda kitchen remodeling, North Potomac handyman service, Silver Spring sunrooms, Olney room additions, basement finishing, design build, construction company, building company, Maryland construction, and general contractor Potomac.