Clarendon Hills, Illinois
Quiet village, serious houses. Clarendon Hills' teardown-era rebuilds stand on tall, dry foundations that hold recovery suites beautifully, and the expectations here mirror Hinsdale next door: clear cedar sauna interiors, a cold plunge integrated into stone rather than sitting on it, steam rooms sealed and vented to disappear into the home's finish level.
ONIT builds those suites with the below-grade engineering that keeps them healthy, dedicated circuits, planned drainage, and ventilation designed for humid rooms underground. Every project begins with a free in-home design consultation and a fully itemized quote, with permits handled and financing available on larger projects.
It starts with a free in-home design consultation. We measure your basement, check moisture and mechanicals, and talk through how you want the space to live. You get a design and an itemized quote, we handle permits and inspections, and one team runs the build from the first cut to the final walkthrough. Most projects take 6 to 12 weeks of construction.
The same level as the rest of your home, which in this village is high. Vertical-grain cedar, honed stone and large-format tile, frameless glass, warm layered lighting, and heated floors are typical selections. We document every material in the itemized quote before construction, so the finished suite matches what was designed rather than what was substituted.
By being built as a sealed system inside a ventilated zone. The enclosure gets a continuous vapor barrier and a ceiling sloped so condensation sheds, the suite gets dedicated mechanical exhaust, and surrounding assemblies use materials that tolerate humidity. That engineering is invisible in the finished room, which is exactly the point.
Rebuilds are the easy case: tall, dry foundations with clean access for circuits, drains, and duct runs. Older Clarendon Hills homes are evaluated honestly first, checking moisture behavior, headroom, and panel capacity before design. Many support a sauna and plunge comfortably even where steam is not advisable. Either way you get a straight answer up front.
Tell us about your basement and we will follow up within one business day to set up an in-home visit.