Willowbrook, Illinois
Homeowners in Willowbrook's upscale single-family pockets shop the same luxury corridor as Burr Ridge next door, and their lower-level wishlists read similarly: a bar, a theater, and increasingly a recovery suite alongside them. Cedar sauna, cold plunge, steam shower, heated floors, built into the floor plan rather than squeezed in after.
The wet zone is where engineering matters most, and it is where ONIT concentrates: dedicated circuits, real drainage, vapor-sealed steam enclosures, and mechanical ventilation that keeps below-grade air healthy. Free in-home design consultations, itemized quotes, permits handled, licensed and insured, 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.
Yes, when the floor is zoned deliberately. Humid rooms are grouped and contained, the steam enclosure sealed as its own vapor envelope and the suite exhausted separately, so moisture never drifts toward theater acoustics or bar millwork. Willowbrook lower levels are large enough to hold all three zones when they are planned together from the first drawing.
It means the wellness zone gets its own mechanical exhaust sized for the steam generator and plunge evaporation, ducted to move humid air out of the basement entirely. Combined with vapor sealing at the steam room and moisture-tolerant finishes nearby, it keeps the suite and everything around it dry. Basement air does not manage itself, so we manage it.
Every project gets a fully itemized quote, so you see the sauna, plunge, steam, and mechanical scope priced line by line rather than buried in an allowance. Typical builds run 6 to 12 weeks depending on how much of the floor we are finishing. Financing is available on larger projects, and the design consultation is free.
Tell us about your basement and we will follow up within one business day to set up an in-home visit.