Gateway Realty Group
Aerial view of new construction homes in the Harvest neighborhood of O'Fallon, Missouri

New Construction Homes for Sale in St. Charles County, 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.

Homes for Sale
481
Median List Price
$464,900
Avg Price / Sqft
$237
Range
$255K–$1.7M

Homes for sale in New Construction in St. Charles County

New Construction in St. Charles County

New construction is happening all over St. Charles County, but most of it is on the western half, in Wentzville, Lake St. Louis, O'Fallon, Dardenne Prairie and Foristell. You'll see finished spec homes, homes under construction and to-be-built plans on this page. Out in Defiance and New Melle, new construction usually means a custom or semi-custom home on several acres, which is a very different process than picking a floor plan in a subdivision.

Buying in St. Charles County?

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 over New Town in St. Charles, Missouri

What is St. Charles County actually like to live in?

This page is the inventory. Our St. Charles County region guide is the other half: it covers the cities inside the county, how they differ and what daily life is actually like across it.

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 St. Charles County, by the numbers

New construction homes for sale in St. Charles County carry a median list price of $464,900 and run roughly $237 per square foot. The typical listing goes under contract in about 147 days. Asking prices run from $255,000 to $1,699,000.

Where the prices sit

Of what is active today, 3% are priced under $300,000, 56% between $300,000 and $500,000, 29% between $500,000 and $750,000 and 12% above $750,000. About 87% are single-family houses; the rest are condos, villas or townhomes. The median year built is 2026.

Where the listings actually are

Here is where the current inventory sits by town. Prices vary enough from one town to the next that a single median for St. Charles County is not a useful number on its own:

Schools

These listings fall across 5 school districts, led by Wentzville R-IV, which covers about 69% 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 28, 2026 through September 28, 2026.

Where homes for sale in St. Charles County MO actually sit

Homes for sale in St. Charles County MO are spread across a few big cities and a long list of small ones. O'Fallon, St. Charles, Wentzville and St. Peters carry most of the inventory, with Lake St. Louis, Dardenne Prairie, Cottleville, Weldon Spring, Foristell, Defiance, Augusta and New Melle behind them. St. Charles County, MO sits between the Missouri and Mississippi rivers, just across the Missouri from St. Louis County, and most commutes toward St. Louis run on Interstate 70, Interstate 64 or Route 364.

What you are choosing between

You can find just about every type of home in this county: detached houses, villas, townhomes, condos, and homes on acreage out west. It's one of the few places in the St. Louis area where each of those is easy to find rather than the exception. The listings above run through coming soon, active, active under contract and pending, and the filters let you show or hide each one.

Thinking about the area itself?

This page is about what is for sale. If you are still deciding whether St. Charles County is the right place for you, our St. Charles County region guide covers the cities inside the county, how they differ and what daily life is actually like across it. To see everything for sale here rather than just new construction, go to all homes for sale in St. Charles County.

Keep looking

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St. Louis County guides

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St. Charles County by feature

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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 28, 2026 at 9:41 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.