Building Setbacks & Zoning in Florissant, MO

If you live in Florissant or are thinking about moving there, building setbacks & zoning are one of those things you probably won't think about until they affect you directly. Florissant has 2 specific rules on the books covering different aspects of building setbacks & zoning, and some of them might surprise you.

Structure Height Limits

Florissant caps single-family homes in the R-1 Single-Family Dwelling District at two and one-half stories and thirty-five feet under the zoning code's height, area and bulk table. The same table sets a one-acre minimum lot, a 30-foot front yard and a 35-foot rear yard. The Building Commissioner enforces the limit through the building permit process before construction begins.

Key details: Max height, R-1 district: 35 feet. Max stories, R-1 district: 2½ stories. Min front yard depth: 30 feet. Min rear yard depth: 35 feet. Enforcing office: Building Commissioner, City of Florissant.

Building without a permit or exceeding the 35-foot/two-and-a-half-story cap violates Florissant's Zoning Code, enforced by the Building Commissioner's office, which reviews plans before issuing a building permit and can order corrective changes or halt construction found out of compliance during inspection. Repeat or uncorrected violations of the Zoning Code are prosecuted as ordinance violations in Florissant Municipal Court, and a builder denied a permit or cited for exceeding the limit can appeal to the Board of Adjustment.

Setback Rules

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.

Key details: 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.

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.

The Bottom Line

Florissant's building setbacks & zoning rules are a mixed bag. Some areas are strict, others are relaxed, and the details matter. The best approach is to check the specific rule that applies to your situation rather than assuming Florissant is broadly strict or permissive.

These rules come from Florissant's publicly available municipal code. For complete penalty schedules, exemption details, and answers to common questions, see the individual ordinance pages throughout this guide.