Arizona is the fastest-aging state in the Southwest — 18.4% of residents are over 65, and Maricopa, Pinal, and Yavapai counties are absorbing retirees from every colder state in the country. The Valley of the Sun housing stock is dominated by single-story stucco-over-frame homes on slab foundations, which sounds like a dream for accessibility until you hit the 1980s and 1990s two-story production homes in Chandler, Gilbert, Scottsdale, Peoria, and Surprise. Those are our highest-volume installs — a 13-to-15-step straight staircase built into a lightweight wood frame, not a masonry wall.
Northern Arizona is a completely different install. Flagstaff, Prescott, Prescott Valley, Sedona, and Payson sit between 4,500 and 7,000 feet of elevation, which means real winters (Flagstaff averages 100+ inches of snow per year) and a much older housing stock with more split-levels, basements, and two-story mountain cabins. The altitude also changes which battery chemistry we spec — sealed lead-acid cells lose roughly 3% capacity per 1,000 feet above sea level, so any Flagstaff or Prescott install gets a lithium cell standard.
The retirement-community story dominates three corners of the state. Sun City, Sun City West, and Sun City Grand in the northwest Valley; Green Valley and Sahuarita south of Tucson; and the Lake Havasu City / Bullhead City retiree belt along the Colorado River. These communities have specific HOA architectural review processes we have already been through dozens of times — in Sun City and Sun City West, for example, the Recreation Centers of Sun City (RCSC) has a documented accommodation-approval path that takes about 10 days.
Built for the Arizona climate
Arizona wrecks stairlifts two ways: heat and dust. Phoenix-metro summer highs above 110°F for 100+ days per year push interior attic-adjacent staircases to 95-100°F ambient, which thins standard lubricants and accelerates plastic-component aging. Every Valley install gets a high-temperature synthetic lubricant rated to 125°F continuous and a UV-stable seat fabric on any rail exposed to a skylight or west-facing window. Fine desert dust (monsoon haboobs) gets into the rail gearing — every Arizona install gets sealed gear housings and a 6-month dust-check service visit built into the first-year plan. Flagstaff and Prescott altitude installs swap sealed lead-acid for lithium as standard.