E.H. Duncan is a proud member of:

- Mahoning Valley Chamber of Commerce
- Mahoning County Better Business Bureau
- Youngstown Assoc. of Plumbing & Heating Contractors
- Poland Business Association
- National Federation of Independent Businesses
- National Kitchen & Bath Association
- Guild of Professional Kitchen/Bath Planners
- Guild of Accredited Cabinetry Space Designs
- National Association of the Remodeling Industry (NARI)
- Drug-Free Workplace
- Mahoning Valley Safety Council
- Valley Remodelers Association