Florissant, MO Building Setbacks & Zoning: Setback Rules (2026)
Key Facts
- Front yard setback
- 30 feet minimum
- Rear yard setback
- 35 feet minimum
- Side yard setback
- 15 feet minimum, each side
- Minimum lot area
- 1 acre
- Minimum lot frontage
- 120 feet
- Minimum lot depth
- 150 feet
Summary
In Florissant's 'R-1' Single-Family Dwelling District, a house must sit at least 30 feet back from the front lot line, 35 feet from the rear, and 15 feet from each side yard, on a lot of at least one acre with 120 feet of frontage.
Height, Area And Bulk Regulations. The height, area and bulk requirements for permitted uses shall be as follows: ... ... 4. Minimum depth (front yard). Thirty (30) feet. 5. Minimum depth (rear yard). Thirty-five (35) feet. 6. Minimum width (side yard). ... Fifteen (15) feet. 7. Minimum lot frontage width. One hundred twenty (120) feet. 8. Minimum lot depth. One hundred fifty (150) feet.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: rev 4989395; v43 updated 2026-05-26; through 05-26-2026).
Full Breakdown
085(E) sets the Height, Area and Bulk Regulations for the 'R-1' Single-Family Dwelling District. Beyond the yard depths, the same subsection requires a minimum lot area of one acre, caps buildings at two-and-one-half stories and 35 feet in height, and sets a minimum lot frontage of 120 feet and minimum lot depth of 150 feet; lots on a cul-de-sac turnaround get a reduced 40-foot minimum frontage measured along the turnaround and 60-foot minimum width along the building line. 085(G), which cap most rear- and side-yard fencing at six feet and generally exclude front-yard fencing from the required front yard. 085(A)(7).
Violations & Fines
Building or expanding a structure within the required front, side or rear yard in the R-1 district violates § 405.085(E) and is enforced under § 405.480 as a Zoning Code violation: a misdemeanor fine of $10 to $100 per day the encroachment continues, or $25 to $100 per day (or up to 10 days' imprisonment) if willful, plus potential civil liability to a neighbor harmed by the violation. An owner ordered to remove an encroaching structure who fails to comply within 10 days after service of the order remains subject to continuing daily penalties.
Frequently Asked Questions
How far must a house sit from the front property line in R-1 Florissant?
What are the side and rear yard setbacks in an R-1 Florissant lot?
What's the minimum lot size for a house in Florissant's R-1 district?
Sources & Official References
Other rules in Florissant
Compare Florissant to another location·View the Missouri building setbacks & zoning overview
See something wrong?
Help us keep this page accurate. If you notice an error or outdated information, let us know.