9

O'Fallon, MO Homes for Sale with In-Law Suite

Section Image Section Image
  • 8265 Mexico Rd Unit 36676877, O'Fallon, MO 63376
    8265 Mexico Rd Unit 36676877, O'Fallon, MO 63376
    8265 Mexico Rd Unit 36676877, O'Fallon, MO 63376
    /42

    $543,000 New Construction

    • 3 - 4 Beds
    • 2.5 - 3.5 Baths
    • 2,369 Sq Ft

    Madison Plan at Strawberry Farms - Liberty Series, O'Fallon, MO 63376

    The Madison is a charming 1-1/2 story home offering 2,369 square feet of living space. Upon entering, youll find a spacious Dining Room off the Foyer, setting the tone for this open-concept layout. The kitchen, Breakfast Room, and Great Room flow seamlessly, creating an ideal space for entertaining and family gatherings. The kitchen features a large walk-in pantry, with an optional butler's

    McKelvey Homes Builder
    8265 Mexico Rd Unit 36676877, O'Fallon, MO 63376
  • 8265 Mexico Rd Unit 36676814, O'Fallon, MO 63376
    8265 Mexico Rd Unit 36676814, O'Fallon, MO 63376
    8265 Mexico Rd Unit 36676814, O'Fallon, MO 63376
    /30

    $574,500 New Construction

    • 4 - 5 Beds
    • 2.5 - 3.5 Baths
    • 2,956 Sq Ft

    Washington Plan at Strawberry Farms - Liberty Series, O'Fallon, MO 63376

    The Washington is a 2-Story 2,956 s.f. The Living Rm or Study and Dining Room are off of the Foyer. This home has a wonderful open flow with Kitchen, Breakfast Rm and Family Room. The Guest Bedroom and Bath could be built on the first floor in lieu of the Dining Room. The 2nd Floor includes the Owners Suite with 2 Walk in Closets, Private Commode, 2 sinks and Linen Closet. 3 Bedrooms and Hall

    McKelvey Homes Builder
    8265 Mexico Rd Unit 36676814, O'Fallon, MO 63376
  • 434 Smithton Blvd, O Fallon, MO 63368
    434 Smithton Blvd, O Fallon, MO 63368
    434 Smithton Blvd, O Fallon, MO 63368
    /47

    $665,000

    • 5 Beds
    • 4 Baths
    • 2,762 Sq Ft

    434 Smithton Blvd, O Fallon, MO 63368

    This beautiful 1.5-story home is packed with charm, style, and space. The moment you walk in, the grand open staircase and soaring living room ceilings take your breath away. The open main level is perfect for entertaining, flowing effortlessly into the chef’s kitchen with a gorgeous backsplash, granite countertops, and tons of windows filling the space with natural light. Enjoy the rare luxury

    Brian Wyatt Nettwork Global

    434 Smithton Blvd, O Fallon, MO 63368
  • 201 Randlin Dr Unit 36674309, Lake Saint Louis, MO 63367
    201 Randlin Dr Unit 36674309, Lake Saint Louis, MO 63367
    201 Randlin Dr Unit 36674309, Lake Saint Louis, MO 63367
    /42

    $496,500 New Construction

    • 3 - 4 Beds
    • 2.5 - 3.5 Baths
    • 2,369 Sq Ft

    Madison Plan at Sommerlin - Liberty Series, Lake Saint Louis, MO 63367

    The Madison is a charming 1-1/2 story home offering 2,369 square feet of living space. Upon entering, youll find a spacious Dining Room off the Foyer, setting the tone for this open-concept layout. The kitchen, Breakfast Room, and Great Room flow seamlessly, creating an ideal space for entertaining and family gatherings. The kitchen features a large walk-in pantry, with an optional butler's

    McKelvey Homes Builder
    201 Randlin Dr Unit 36674309, Lake Saint Louis, MO 63367
  • 201 Randlin Dr Unit 36674333, Lake Saint Louis, MO 63367
    201 Randlin Dr Unit 36674333, Lake Saint Louis, MO 63367
    201 Randlin Dr Unit 36674333, Lake Saint Louis, MO 63367
    /19

    $539,000 New Construction

    • 3 - 4 Beds
    • 2.5 - 3.5 Baths
    • 2,369 Sq Ft

    Madison 3 Car Garage Plan at Sommerlin - Liberty Series, Lake Saint Louis, MO 63367

    The Madison is a charming 1-1/2 story home offering 2,369 square feet of living space. Upon entering, youll find a spacious Dining Room off the Foyer, setting the tone for this open-concept layout. The kitchen, Breakfast Room, and Great Room flow seamlessly, creating an ideal space for entertaining and family gatherings. The kitchen features a large walk-in pantry, with an optional butler's

    McKelvey Homes Builder
    201 Randlin Dr Unit 36674333, Lake Saint Louis, MO 63367
  • 201 Randlin Dr Unit 36674351, Lake Saint Louis, MO 63367
    201 Randlin Dr Unit 36674351, Lake Saint Louis, MO 63367
    201 Randlin Dr Unit 36674351, Lake Saint Louis, MO 63367
    /25

    $623,615 New Construction

    • 4 Beds
    • 2.5 Baths
    • 3,302 Sq Ft

    Madison II Plan at Sommerlin - Liberty Series, Lake Saint Louis, MO 63367

    The Madison II is a spacious 1-1/2 story home offering 3,300 sq. ft. of living space. Upon entry, a versatile Flex Room is located off the foyer, with a Dining Room nearbythese rooms can be connected with elegant French doors. The home features an open flow through the Kitchen, Breakfast Room, and Great Room, perfect for entertaining. The Family Room is highlighted by a large window wall and an

    McKelvey Homes Builder
    201 Randlin Dr Unit 36674351, Lake Saint Louis, MO 63367
  • 201 Randlin Dr, Lake Saint Louis, MO 63367
    201 Randlin Dr, Lake Saint Louis, MO 63367
    201 Randlin Dr, Lake Saint Louis, MO 63367
    /31

    $889,975 New Construction

    • 5 Beds
    • 4.5 Baths
    • 3,554 Sq Ft

    201 Randlin Dr, Lake Saint Louis, MO 63367

    MOVE-IN READY! This exquisite 5-bedroom, 4.5-bathroom Madison Display in the Sommerlin community blends elegance, function, and luxury finishes at every turn. The first floor opens with a spacious dining room, perfect for hosting family gatherings or dinner parties. The gourmet kitchen is the heart of the home, anchored by a large quartz island with seating for four. A microwave and oven combo,

    McKelvey Homes Builder
    201 Randlin Dr, Lake Saint Louis, MO 63367
  • 201 Randlin Dr Unit 36674336, Lake Saint Louis, MO 63367
    201 Randlin Dr Unit 36674336, Lake Saint Louis, MO 63367
    201 Randlin Dr Unit 36674336, Lake Saint Louis, MO 63367
    /21

    $559,300 New Construction

    • 4 - 5 Beds
    • 3.5 Baths
    • 2,956 Sq Ft

    Washington 3 Car Garage Plan at Sommerlin - Liberty Series, Lake Saint Louis, MO 63367

    The Washington is a 2-Story 2,956 s.f. The Living Rm or Study and Dining Room are off of the Foyer. This home has a wonderful open flow with Kitchen, Breakfast Rm and Family Room. The Guest Bedroom and Bath could be built on the first floor in lieu of the Dining Room. The 2nd Floor includes the Owners Suite with 2 Walk in Closets, Private Commode, 2 sinks and Linen Closet. 3 Bedrooms and Hall

    McKelvey Homes Builder
    201 Randlin Dr Unit 36674336, Lake Saint Louis, MO 63367
  • 201 Randlin Dr Unit 36674301, Lake Saint Louis, MO 63367
    201 Randlin Dr Unit 36674301, Lake Saint Louis, MO 63367
    201 Randlin Dr Unit 36674301, Lake Saint Louis, MO 63367
    /26

    $527,900 New Construction

    • 4 - 5 Beds
    • 3.5 Baths
    • 2,956 Sq Ft

    Washington Plan at Sommerlin - Liberty Series, Lake Saint Louis, MO 63367

    The Washington is a 2-Story 2,956 s.f. The Living Rm or Study and Dining Room are off of the Foyer. This home has a wonderful open flow with Kitchen, Breakfast Rm and Family Room. The Guest Bedroom and Bath could be built on the first floor in lieu of the Dining Room. The 2nd Floor includes the Owners Suite with 2 Walk in Closets, Private Commode, 2 sinks and Linen Closet. 3 Bedrooms and Hall

    McKelvey Homes Builder
    201 Randlin Dr Unit 36674301, Lake Saint Louis, MO 63367
Missouri St. Charles County O'Fallon

Homes for Sale with In-Law Suite in O'Fallon, MO

Home Trends in O'Fallon, MO

On average, homes in O'Fallon, MO sell after 29 days on the market compared to the national average of 53 days. The median sale price for homes in O'Fallon, MO over the last 12 months is $370,000, up 2% from the median home sale price over the previous 12 months.

Housing Trends

Median Sale Price
$370,000
Median Single Family Sale Price
$412,222
Median Townhouse Sale Price
$280,000
Median 2 Bedroom Sale Price
$205,000
Average Price Per Sq Ft
$188
Number of Homes for Sale
317
Last 12 months Home Sales
1,139
Months of Supply
3.30
Median List Price
$395,000
Median Change From 1st List Price
0%
Median Home Sale Price YoY Change
2%
How to Buy a Home How to Finance a Home How to Sell a Home

In O'Fallon, there are currently 9 homes for sale with in-law suites. These properties offer a flexible and practical housing solution, featuring in-law suites that provide separate living quarters complete with a bedroom, bathroom, and occasionally a kitchenette. This setup ensures privacy and autonomy for both residents and guests. Whether it's a generous family home with a detached guest house or a contemporary townhouse featuring an attached in-law suite, these residences accommodate a range of needs and preferences. Browse the selection of homes for sale with in-law suites in O'Fallon, MO that allow for accommodating extended family or hosting guests.

Disclaimer: Certain information contained herein is derived from information provided by parties other than Homes.com. All information provided is deemed reliable, but is not guaranteed to be accurate and should be independently verified.

Homes.com Licensing Information

§ 442-H New York Standard Operating Procedures

New York Fair Housing Notice

TREC: Information about brokerage services, Consumer protection notice

California DRE #01937601

Contact Homes.com Brokerage

Copyright © 2026 CoStar Group