Gateway Realty Group
Aerial view of Fischer Homes new construction at Streets of Caledonia in O'Fallon, Missouri

New Construction Homes for Sale in O'Fallon, MO

A builder's contract is not the standard resale contract, and the sales agent in the model home represents the builder, not you. The upgrade and lot-premium decisions are usually where the money is won or lost.

Listings Shown
167
Median List Price
$460,400
Avg Price / Sqft
$226
Range
$249.9K–$939.3K

Homes for sale in New Construction in O'Fallon

There are two O'Fallons, and this one spans three school districts

There is an O'Fallon in Missouri and an O'Fallon in Illinois, on opposite sides of the river, and search results mix the two constantly. This page is the Missouri one, in St. Charles County. If you are comparing against prices you have read somewhere else, it is worth checking which O'Fallon they were describing.

The second thing to know is that the city spans three school districts, Wentzville, Fort Zumwalt and Francis Howell, and their boundaries follow neither the city limits nor the subdivision names. Which one a house is assigned to is a question about that specific address, not about O'Fallon.

Buying in O'Fallon?

We represent buyers here every week. That means a straight answer on what a home is actually worth, early word on what is about to come up, and somebody negotiating for you instead of for the seller.

Aerial view of the ballfields at Dames Park in O'Fallon, Missouri in autumn

What is O'Fallon actually like to live in?

This page is the inventory. Our guide to moving to O'Fallon is the other half: it covers the neighborhoods, the parks, the commute and what daily life is actually like here.

We filmed it, we sell in it, and we wrote it down.

Read the guide

Can't find what you're looking for?

We hear about homes before they hit the market, and we show plenty that are never advertised at all. If nothing above is right, tell us what you want and we will bring you options that are not on this page.

New Construction in O'Fallon, by the numbers

New construction homes for sale in O'Fallon carry a median list price of $460,400 and run roughly $226 per square foot. The typical listing goes under contract in about 133 days. Asking prices run from $249,900 to $939,322.

Where the prices sit

Of what is active today, 5% under $300,000, 59% $300,000 to $500,000, 34% $500,000 to $750,000 and 2% above $750,000. About 81% are single-family houses; the rest are condos, villas or townhomes. The median year built is 2026.

Where the listings actually are

A handful of subdivisions account for much of the current inventory, and the spread between them is wide enough that a single median for O'Fallon is not a useful number on its own:

Schools

These listings fall across 2 school districts, led by Wentzville R-IV, which covers about 87% of them. Confirm the assigned elementary and middle schools address by address rather than by subdivision, since attendance boundaries move.

Based on information from Mid America Regional Information Systems, Inc. for the period September 21, 2026 through September 21, 2026.

Where homes for sale in O'Fallon MO actually sit

Homes for sale in O'Fallon, MO are spread across two main postal codes, 63366 on the north and east side of the city and 63368 to the south and west. O'Fallon, MO touches St. Peters and St. Charles on one side and Lake Saint Louis, Wentzville, and Dardenne Prairie on the other, so a search that stops at the city line misses homes only a few minutes away. Which part of the city a house sits in affects the commute and the school district more than it affects the asking price.

What you are choosing between

O'Fallon is one of the larger housing markets in this part of Missouri, and the range of property types reflects that. Alongside detached single-family houses, you will find villas, townhouses and condominiums, which is what lets the city serve both a first purchase and a move down. The three school districts are Wentzville, Fort Zumwalt and Francis Howell, and the one attached to an address is worth confirming on that address. Listings move through coming soon, active, active under contract and pending, and the filters above let you keep or exclude each of those.

Thinking about the area itself?

This page is about what is for sale. If you are still deciding whether O'Fallon is the right place for you, our guide to moving to O'Fallon covers the neighborhoods, the parks, the commute and what daily life is actually like here. To see everything for sale here rather than just new construction, go to all homes for sale in O'Fallon.

Keep looking

St. Louis County guides

St. Charles County guides

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St. Louis City guides

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O'Fallon by feature

MLS GRIDMARIS MLS

Listings courtesy of MARIS as distributed by MLS GRID

Some IDX listings have been excluded from this website.

Based on information submitted to the MLS GRID as of September 21, 2026 at 12:40 PM CDT. All data is obtained from various sources and may not have been verified by broker or MLS GRID. Supplied Open House Information is subject to change without notice. All information should be independently reviewed and verified for accuracy. Properties may or may not be listed by the office/agent presenting the information.

IDX information is provided exclusively for consumers’ personal, non-commercial use and may not be used for any purpose other than to identify prospective properties consumers may be interested in purchasing. Any other use or search of this data, including by anyone other than a consumer looking to purchase real estate, is prohibited. Data is deemed reliable but is not guaranteed by MLS GRID.