By the usual measures, St. Charles County resale homes look like they are holding firm. In August 2026, detached homes across the county sold for 100.8% of list price on average, went under contract in a median of 25 days, and sat on 2.9 months of supply. Those figures come with an exclusion printed at the bottom of the same report.
The Asterisk Under the Price
The August 2026 Local Market Update from MARIS, posted by the St. Charles County Association of REALTORS, marks its price figures with this note:
"Does not account for sale concessions and/or downpayment assistance."
That note covers the median sale price, the average sale price, and the percent of list price received. Say a seller accepts full price and then hands back a credit toward the buyer's closing costs. The report records a full-price sale. The seller nets less. In a market where builders openly compete on credits and rate buydowns, the gap between a recorded price and what a seller actually walks away with is where the competition shows up.
So the 100.8% figure is accurate, but it measures only list against sale. It says nothing about what changed hands after the price was agreed. For anyone selling a resale home in St. Charles this fall, the useful question is no longer how close you can get to list. It is what a buyer can get from a builder a few miles away for the same monthly payment.
What Sits Beside a $389,950 Resale
The county's median detached sale price in August 2026 was $389,950, up 0.8% from August 2025. Now look at the new construction priced around that number inside the City of St. Charles.
McBride Homes' Elm Crossing is a 33-homesite community on a single private cul-de-sac off Elm Street, a few minutes from New Town. McBride lists six quick-move homes there, priced from $389,900 to $489,900. The cheapest of the six is priced within $50 of the county's median resale sale.
At New Town at St. Charles, Houston Homes is advertising a move-in-ready home at 237 Arpent Alley, a three-bedroom, 2.5-bath plan of 1,772 square feet, at $409,900 under the banner "Price Reduced $90K." The builder's Grove townhome plan in New Town starts at $289,900. Nearby, Lombardo Homes lists 106 Cottle Creek Way in Crooked Creek at Cottleville Trails, which carries a St. Charles address, at $410,000, marked "Price Reduced" and "Immediate Occupancy."
These are finished houses. A buyer can close on them about as fast as on a resale, with no inspection repair list and no aging furnace to haggle over. A resale seller at $390,000 to $410,000 is competing against them directly.
Builders Are Selling Terms, Not Just Prices
The list prices above are only the starting point. Several builders working in St. Charles and the surrounding county are advertising incentives that go after a buyer's cash to close and monthly payment. MARIS price figures can't show either of those.
| Builder | Advertised offer | Stated deadline |
|---|---|---|
| McBride Homes | "Extended Blue Tag Sale": up to $69,139 off select quick-move homes; $2,000 to $10,000 off base price on a home built from scratch | Quick-move purchase by October 31 |
| Rolwes | Up to $30,000 in Flex Cash on select to-be-built homes, usable toward a rate buydown, eligible closing costs, upgrades, or a mix | Through October 31, 2026 |
| T.R. Hughes, Charlestowne Landing | Fall Inventory Sale: up to $40,000 in savings plus up to $5,000 toward closing costs | No date stated |
| Houston Homes, New Town | $90,000 price reduction on 237 Arpent Alley | No date stated |
A few details sharpen the picture. McBride bills its promotion as an extended sale, so the deal is running past its original window. Neither McBride nor Rolwes names the participating communities on its offer page, so a buyer has to ask, home by home, whether a given house qualifies. T.R. Hughes' only move-in-ready home at Charlestowne Landing, 312 Summer Glen Lane, is listed at $659,900, well above the median. That puts its incentive in competition with the county's upper bracket of resales.
Rolwes' Flex Cash shows how this works. A builder can put $30,000 toward a rate buydown, and the sale price on the contract never moves. Comparable-sales data then records a full-price new-home sale, and the buyer's monthly payment comes out lower than an identically priced resale would allow. The October 31 deadlines on the McBride and Rolwes offers fall just after this post goes live, but builders that extend one sale often follow it with another.
Townhomes Show the Pressure First
If builder terms are pulling buyers away from resales, the effect should show first where new and resale product overlap most. In St. Charles County, that is the townhouse and condo segment, and the August 2026 numbers fit.
Compared with August 2025, county townhouse and condo sales in August 2026 showed:
- Days on market: up from 26 to 44
- Percent of list price received: down from 99.8% to 98.0%
- Inventory: up from 213 to 238 units, an 11.7% increase
- Months of supply: up from 2.5 to 2.8
Demand did not fall. Pending townhouse and condo sales rose 33.7%, from 83 to 111. Buyers are still signing contracts. Each sale is just taking longer and closing further below list, even before any concessions the report leaves out. Meanwhile, the August median townhouse sale was $259,315, and Houston Homes' new Grove townhomes in New Town start at $289,900. A $30,000 gap is small enough for a buydown or closing credit to cover, at least as far as the monthly payment goes.
Detached sellers have the same exposure on a slower clock. Detached new listings in the county rose 13.5% year over year in August, to 546, and inventory grew 8.2%, to 1,152 homes. Prices held anyway, with more homes available for buyers to choose from.
More New Supply Is Already Coming
The builders' inventory is not shrinking. St. Charles County issued 79 single-family detached permits in August 2026 and 788 for the year through August. On October 17, McBride, McKelvey Homes, and Fischer & Frichtel were scheduled to open display homes at Post Farms in O'Fallon, a 119-homesite community. In mid-October, McBride also listed quick-move homes across the three villages of Wilmer Crossing in Wentzville, priced from $379,900 to $538,444.
That Wentzville range lines up with the price band where most St. Charles County resales trade. A buyer relocating into the area who tours a resale on a Saturday morning can tour a finished spec home with a buydown that same afternoon.
Pricing a Resale Against a Spec House
For a resale seller in the City of St. Charles, all this changes the comparison. Recent neighborhood sales still set the base. But the buyers most likely to walk through your door have probably been in a builder's sales office, and they arrive comparing three numbers:
- Effective price. List price minus any discount or credit. A $409,900 new home with a $90,000 reduction already built in sets a different benchmark than the sticker suggests.
- Cash to close. Closing-cost credits from builders, like T.R. Hughes' up to $5,000, shrink the amount a buyer needs at the table.
- Monthly payment. Builder money spent on a rate buydown changes the payment without changing the price, and the payment is where many buyers decide.
Buyers can use the same list from the other side. A resale that matches a spec home on effective price and monthly payment may come with something the spec home lacks, and a seller who knows what nearby builders are offering can put a concession where it does the most good. How buydowns and credits apply to a specific loan depends on the lender and the buyer's situation. Treat this as general market information, not financial advice, and confirm the details with your lender.
A Few Quick Questions
Are St. Charles home prices falling? Not by the recorded figures. The county's median detached sale price in August 2026 was up 0.8% from a year earlier, and year-to-date through August it was up 5.3%, to $400,000. Those figures leave out concessions, so net proceeds may be telling a different story.
Which builder homes qualify for the October promotions? McBride and Rolwes both describe their offers as applying to select homes and don't publish a list of qualifying communities on their offer pages, so eligibility has to be confirmed home by home.
Does this apply to historic homes in St. Charles? The pressure is strongest where a resale and a new home look alike to a buyer: similar size, similar price, similar layout. The further a home sits from what a builder can deliver, the less direct the comparison.
If you are deciding how to price a St. Charles resale this fall, or whether a builder's incentive really beats the house you love, The Warner Hall Group can walk through the effective price, credits, and payment math on the specific homes you are weighing. Request a private consultation.
