Overhead Door Company of Portsmouth™ Portsmouth, New Hampshire Overhead Door Company of Portsmouth™ provides garage door installation, service and repair in Portsmouth and the surrounding areas of Eastern New Hampshire. Their product offering consists of both residential garage door and industrial - commerical door products. If you are a home owner, you can select from a large selection of garage door designs, styles and options. Overhead Door Company of Portsmouth™ makes working with architects, builders and business easy with a design service; a group of door experts assisting you to find the perfect commercial door system for your industrial application. Contact them today to work with their team of highly trained installers, technicians and service professionals.