Question 1

Does St. Charles County tax a spec home before it sells?

Accepted Answer

Not as an improved property, as long as it stays unoccupied. St. Charles County has adopted RSMo 137.082, so a newly constructed residential property is assessed and taxed as improved real estate starting the first day of the month following occupancy, not on the statewide January 1 date. An unsold, unoccupied spec home carries land-only assessment until it is occupied, or until January 1 of the fourth year after construction finished, whichever comes first. That is a lighter carry than most other Missouri counties see. The assessor can also deem a property occupied on personal verification, or when any two of an occupancy permit, a deed transfer, a utility transfer, or an address change with a government agency are on file, so turning the utilities on starts the clock even before a sale closes.

Question 2

What does a Wentzville building permit actually cost?

Accepted Answer

Around 0.70% of the ICC valuation, combined. Wentzville prices its building permit fee at a 0.0050 multiplier and its plan review fee at a 0.0020 multiplier, both applied to construction cost from the ICC Building Valuation Data table, for 0.70% combined. On a $400,000 valuation that is about $2,800 in city fees (400,000 x 0.0070 = 2,800). A permit expires if no inspection occurs within 180 days of issue or of the last inspection, so a build that stalls needs an inspection on the books before that window closes. Plan review turnaround in business days for Wentzville, O'Fallon, or St. Peters is not published, so do not lock a start date to a specific review window; we size the term to your real permit path.

Question 3

How much of St. Charles County is in a floodplain, and what does that mean for a new build?

Accepted Answer

About 43% of the county is FEMA flood-vulnerable, and the county's density-floodway rule caps what you can build on an affected lot. Roughly 13% of that vulnerable land sits along interior creeks such as Dardenne, Femme Osage, Peruque and Belleau, and 30% sits along the Missouri and Mississippi rivers, so a lot can be miles from either river and still be inside a mapped floodplain. In the county's density floodway, the maximum developable surface area is capped at 18% of the lot, the structure must sit on the higher ground, and it must be elevated at least one foot above the base flood elevation. A separate county Floodplain Development Permit is required on top of the city building permit. Pull the FEMA map on the specific parcel before you finalize a site plan, not after.

Question 4

Does building in the city of St. Charles come with extra review?

Accepted Answer

Yes, if the lot sits in one of the city's historic districts. The city of St. Charles has designated 26 individual landmarks and 6 historic districts covering more than 3,000 properties, including South Main, Historic Downtown, and Frenchtown. Any construction, alteration, or demolition touching a landmark or a structure inside a district needs a Certificate of Appropriateness from the Historic Landmarks Preservation and Architectural Review Board, judged against the district's design guidelines. That board meets once a month, generally the third Monday, so a submittal that misses the cutoff adds roughly four weeks of hold before the building permit process even starts. Confirm your lot's district status with the city before you set a construction schedule.

Question 5

Which impact or capacity fees should I budget for outside Wentzville?

Accepted Answer

None are published for O'Fallon, St. Peters, or the rest of the county, so do not assume a number. No impact fee, capacity fee, or park fee schedule for any St. Charles County city other than Wentzville's ICC-based permit fee was located, and no published plan-review turnaround in business days exists for O'Fallon or St. Peters either. Budget the permit process on the timeline the city gives you at submittal, and confirm any fee schedule directly with that city's building division before you finalize your draw budget.

Question 6

How much do I need to bring to a St. Charles County ground-up build?

Accepted Answer

About 15% of total cost. We go up to 85% LTC and 70% LTV, whichever binds first, up to $5M. On a $2M St. Charles County project that is up to $1.7M from us against cost (2,000,000 x 85% = 1,700,000), with the 70% LTV test applied against finished value. On a spec build where your exit price is uncertain, the LTV test is usually the one that binds, not the cost test. Subject to underwriting.

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