Illinois is defined by its housing stock. In Chicago, the dominant house is the three-flat or two-flat brick walkup — narrow staircases with 7.5-inch risers, tight landings, and ornate balusters you cannot drill into without dust-containment because pre-1978 paint contains lead. In the collar counties (DuPage, Kane, Lake, Will, McHenry), the dominant home is the 1980s-1990s two-story colonial with a straight 13-step flight. In central and southern Illinois — Peoria, Springfield, Decatur, Champaign — you get 1920s bungalows and 1940s Cape Cods with short, steep staircases that do not take standard-length rail mounts without a custom cut.
Chicago is the only Illinois jurisdiction with its own building code. Chicago Building Code Chapter 18 governs any alteration inside a multi-unit building, and condo or co-op approval in high-rise buildings along Lake Shore Drive, Streeterville, and the Gold Coast can add 3-6 weeks to the timeline. Our Chicago crew files the paperwork on your behalf and coordinates with the building engineer. Outside city limits, the Illinois Energy Conservation Code and IRC 2021 govern, and permits for interior stairlifts are not required.
The Illinois winter drives the third consideration nobody mentions in the initial quote. Chicago and the collar counties see 4-8 weeks of sub-freezing temperatures each winter, and garages in McHenry, Lake, and Kane counties routinely dip to 10°F. Off-the-shelf stairlift batteries lose roughly 20% of rated capacity below freezing. Our Illinois fleet ships every install north of I-80 with a cold-weather battery spec standard. Southern Illinois (below I-70 — Carbondale, Marion, Mount Vernon) gets the standard spec because winters rarely cross below 20°F for more than a day or two.
Built for the Illinois climate
Illinois winters are the primary hardware stressor. Chicago and the collar counties see 4-8 weeks of sub-freezing temperatures and occasional polar-vortex events below -10°F, and the swing between a humid 95°F August and a -5°F January creates expansion-contraction cycles that loosen standard rail mounts over 2-3 years. Our Illinois fleet ships three standing upgrades: cold-weather-rated batteries on every install north of I-80, thread-locked rail fasteners to resist cyclical loosening, and a 12-month tension check built into the service plan. Southern Illinois installs (below I-70) use the standard spec because winters rarely push hardware into thermal failure.