Just about all of them. Almost every door out there now is a sectional — steel, aluminum, wood, or carriage-style — and I work on all of those. The only exception is the older one-piece wood tilt-up-style doors, the type that swing out as a single slab. Unfortunately, for these types of doors, replacement parts aren't available anymore, so the only real option is to upgrade to a modern sectional. That also usually means a new opener, too and under current California regulations, any new opener has to include a battery backup so the door still works during a power outage. If you've got an older door and aren't sure what you have, give me a call, and I'll tell you your options.