New Hampshire has the oldest housing stock of any state we serve outside of neighboring Massachusetts and Vermont. Roughly 25% of New Hampshire's housing was built before 1940 — the classic 18th and 19th century cape, colonial, and saltbox pattern. Portsmouth, Exeter, Hanover, Keene, and Dover stock routinely predates 1850, with staircase geometry tighter than modern code allows. Tread widths of 28-32 inches and riser heights of 8.5+ inches are standard. We ship narrow-gauge rails as a default for any pre-1900 New Hampshire address, and we measure stair angle on the intake call because many of these stairs exceed 42 degrees.
The Manchester, Nashua, and Concord corridor runs a mix of mill-house colonials built for textile and shoe workers between 1870 and 1930, post-war ranch tracts, and modern split-levels. Mill-house stairs in Manchester's Millyard neighborhoods, Nashua's French Hill, and the Amoskeag-adjacent housing stock need narrow-gauge rails. Post-war Merrimack County ranch homes are routine straight-rail installs.
Northern New Hampshire and the White Mountains — Coos, Grafton, Carroll, upper Sullivan — bring true mountain winter. Berlin, Lancaster, Colebrook, Pittsburg, and the North Country routinely see -25°F January lows with -40°F windchill. Every install north of Franconia Notch ships with cold-pack batteries rated to -30°F as a baseline spec, plus a battery blanket for any unheated space. Ski-country lakefront retirement homes on Winnipesaukee, Newfound, and Squam Lake add seasonal conversion work where summer cottages are being winterized for year-round living.
Built for the New Hampshire climate
New Hampshire winters are severe but uneven. Southern tier — Nashua, Manchester, Salem, Portsmouth — sees January lows around 10°F, manageable with standard batteries. The White Mountains, North Country, and upper Connecticut River Valley are different: Berlin, Lancaster, Colebrook, Pittsburg, and Errol routinely hit -25°F with -40°F windchill, and Mount Washington holds the Western Hemisphere wind record. Every install north of Franconia Notch ships with cold-pack batteries rated to -30°F standard, plus a battery blanket for any unheated space. Coastal Portsmouth and Rye installs ship with marine-grade rail coating standard due to salt air exposure.