The William's Group is also listed under the following categories: Standard Yellow Pages Heading (SYPH) Categories:

• Heating & Air Conditioning Contractors
• Home & Building Inspection
• Painting Contractors
• Roofing Contractors & Consultants

North American Industry Classification System (NAICS) Categories:

• Roofing Contractors > Roofing Work > Roofing Consultants
• Roofing Contractors > Roofing Work > Roofing Contractors & Consultants
• Plumbing, Heating, And Air-Conditioning Contractors > Heating Contractors
• Painting And Wall Covering Contractors > Painting Contractors
• All Other Business Support Services > Inspection & Testing Services > Building & Land Inspection Service

Standard Industry Classification (SIC) Categories:

• Plumbing, Heating And Air Conditioning > Heating Contractors
• Painting & Paper Hanging > Painting Contractors
• Roofing, Siding, And Sheet Metal Work > Roofing Work > Roofing Consultants
• Roofing, Siding, And Sheet Metal Work > Roofing Work > Roofing Contractors
• Business Services, Nec > Inspection & Testing Services > Building & Land Inspection Service