Northampton's median year built sits at 1956, a decade older than the wider service area's 1965 median. That decade matters on a garage door: openings from the mid-1950s were often framed before manufacturers standardized on the 8-foot and 9-foot widths that dominate today's stock doors. A new install here more often means shimming, re-framing the jamb, or resetting the header than it does in a house built in the 1970s.
The cold-severe climate band is the other driver. A door that's original or near-original to a 1956 build has been through seven decades of freeze-thaw cycling on its track and hardware, whether or not the panel itself has failed. Track brackets pull loose from studs that have shifted, and the concrete slab at the threshold has heaved enough that a new door needs a bottom seal built for a gap that didn't exist when the house was framed.
We see this pattern across the older pockets of the service area, but Northampton's 1956 median puts it on the older side of that range, which is why we scope openings here individually instead of quoting off a standard size sheet.