Based in Billings, Mont., C's Exterior Designs has expertise in residential and commercial exterior remodeling. It provides services related to windows, patio doors, siding, garage doors, entry doors, roofing and siding windows. The company has replaced windows in small family dwellings and installed siding on large apartment complexes. C's Exterior Designs has worked with over 3,000 homeowners and over 30 local home builders in the Billings area. The company is a member of the Billings Home Builders Association.