Biggest House In Illinois: Stunning 30,000 Massive Mansion

This Mokena mansion holds the title of one of the biggest homes in Illinois. It sits at roughly 30,000 square feet of finished living space, built in 2010.

The Biggest House in Illinois has 7 to 9 bedrooms (reports vary by listing year) and 17 total bathrooms. Chandeliers, a winding staircase, and a two-story foyer greet you at the door. It last sold in October 2023 for $2,250,000. Even with all that space, the layout still feels made for slow mornings, movie nights, and long walks around the grounds.

Biggest House in Illinois Location

Full Address: 20105 Alison Trail, Mokena, Illinois 60448.

Biggest House in Illinois is a suburb in Will County, southwest of Chicago. The town has around 20,000 residents and sits near the Old Plank Road Trail and Hickory Creek Preserve, according to [@properties Chicago]. It’s a quiet, tree-lined area. You’d never guess a 30,000 sq ft mansion sits behind those trees.

Biggest House in Illinois House Tour

As Stefano Schiavon from RivonHome, I explored this remarkable Biggest House in Illinois through its listing photos and video, and the scale immediately stood out. A friend in luxury real estate shared the listing with me, insisting I see the extraordinary kitchen, and she was right.

Every room reveals another impressive space, from the grand staircase to expansive living areas and the indoor pool. The thoughtful design and exceptional craftsmanship make the home feel more like a luxury resort than a private residence.

Inside Biggest House in Illinois: Interior and Other Features

Step inside the Mokena mansion’s interior — grand foyer, oversized bedrooms, spa-style baths, home theater, and a kitchen built for real life.

Grand Entrance

You step in through a two-story foyer. A winding staircase curves up toward the second floor. A large chandelier hangs above, catching light from tall windows. The brick exterior gives way to a warmer, neutral palette inside. Every material choice reads as classic rather than trendy. It sets the tone before you’ve even reached the first room.

Bedrooms

Biggest House in Illinois has 7 to 9 bedrooms, depending on the listing year and how rooms get counted. The master suite includes a private “glamour bath,” a term the listing itself uses. Guest suites come with their own private bathrooms, so no one has to share a hallway bath. Each room stays large enough to fit a full furniture set without feeling cramped.

Bathrooms

Seventeen total bathrooms sit across the Biggest House in Illinois, a mix of full and half baths. The master bath shower earned its own mention in local coverage for being bigger than most full bathrooms, per WGN-TV. Materials lean toward stone and tile finishes. Guest bathrooms match the same luxury standard, not a scaled-down version.

Living Spaces

Formal and casual living areas spread across the main floor. A home theater room includes a 4K projector and wet bar for movie nights. The indoor pool and hot tub sit in their own dedicated wing. Every entertaining space connects easily to the next, so guests can move from room to room without backtracking.

Kitchen

The kitchen carries custom cabinetry and a walk-in pantry built for real cooking, not just show. Local coverage pointed out a 14-seat table in the eating area, built to match the oversized theme of the house. The layout keeps prep space, storage, and seating close together, so the room still works for daily life.

Special or Unique Spaces

Biggest House in Illinois office wing could double as a private study or work-from-home setup. The attached garage fits 6 or more cars and includes radiant heat and epoxy flooring. Zoned heating runs on Nest thermostats throughout. It’s the kind of house where even the garage gets a climate system nicer than some apartments.

Security and Privacy

A 32-camera security system covers the grounds. A fire sprinkler system runs throughout the home. A Vantage control system manages lighting across the property. Mature trees surround the lot, blocking sightlines from the road. The setup reads more like a private resort than a typical suburban lot.

How Much Is the House Worth Now?

Biggest House in Illinois last sold for $2,250,000 on October 16, 2023. It had been listed earlier, in 2022, for $3,699,900, or about $123 per square foot at the time. The final sale price came in well under that original ask. It’s currently off-market.

Other Notable Big Houses in Illinois

Illinois hides more giants beyond Mokena — a governor’s estate, a Lincoln Park showpiece, and a century-old Decatur mansion with history.

Illinois Governor’s Mansion

Built in 1855, the Governor’s Mansion in Springfield sits at roughly 45,000 square feet, making it the largest governor’s residence in the country. It has hosted every Illinois governor since Joel Matteson.

The Lincoln Park Mansion, Chicago

A French-inspired mansion at 1932 N Burling St spans 25,000 square feet across eight city lots. It once listed near $50 million and later dropped to just under $30 million.

Frequently Asked Questions About biggest house in Illinois

Is this the biggest house in Illinois?

It’s one of the largest homes ever listed for sale in the state, at around 30,000 square feet. The Governor’s Mansion in Springfield is larger overall, but it isn’t a private home on the market.

Who owns the Mokena mansion now?

Public records show it sold in October 2023 for $2,250,000. Current owner details are part of the public sale record but aren’t confirmed here beyond that transaction.

Why did the price drop from $3.7 million to $2.25 million?

Large, highly custom homes often take longer to sell and finish below the original ask, since the buyer pool for a 30,000 sq ft house is small.

Conclusion

This Mokena mansion earns its reputation as one of the biggest houses in Illinois. Thirty thousand square feet, 17 bathrooms, an indoor pool, and a home theater make it stand out even among luxury listings. It sold for $2,250,000 in 2023, well below its original asking price.

Touring it through photos alone is enough to make your jaw drop. Our clients regularly ask for this same kind of scale and detail in their own home designs, from oversized kitchens to spa-style bathrooms.