Before You Build in Florissant, MO: Permit & Rule Checklist (2026)
Everything you need to know before starting a home improvement project
Building a fence, installing a pool, or adding a shed? Each project has its own set of local permits and rules in Florissant. This guide consolidates fence, pool, ADU, shed, fire pit, and landscaping regulations into one checklist so you know what to expect before you start.
Quick Permit Checklist
At-a-glance overview of permit categories in Florissant. Click any card for details.
Fences & Walls
2 rules on file
Swimming Pools
1 rule on file
ADUs & Granny Flats
1 rule on file
Sheds & Outbuildings
1 rule on file
Fire Pits & Outdoor Structures
1 rule on file
Landscaping & Tree Removal
1 rule on file
Fences & Walls
Some RestrictionsHeight limits, materials, permits, and shared fence rules.
Height Limits
Some RestrictionsFlorissant's Zoning Code (Chapter 405) caps residential fences at 6 feet in side and rear yards in all R districts. No fence is permitted in the required front yard except by Planning and Zoning Commission review. A fence permit from the Building Commissioner is required before construction.
Neighbor Fence Rules
Some RestrictionsMO Rev. Stat. §272.010 provides partition fence cost-sharing for rural/agricultural land. Urban residential: each owner responsible for their own fence.
Swimming Pools
Some RestrictionsPool permits, safety fencing, and drainage requirements.
Fencing Requirements
Some RestrictionsFlorissant requires a permit for any pool 25 inches or deeper. Outdoor pools must be surrounded by a barrier complying with Chapter 305 of the 2021 International Swimming Pool and Spa Code, at least 48 inches high. All gates must be self-closing and self-latching from a 6-inch open position.
ADUs & Granny Flats
Heavy RestrictionsAccessory dwelling unit rules and garage conversion permits.
ADU Rules
Heavy RestrictionsMissouri has no statewide ADU mandate. Florissant's Zoning Code (Chapter 405) does not authorize accessory dwelling units in single-family R-1 through R-4 districts. Section 405.085 limits R-1 to single-family dwellings plus customary accessory buildings. A duplex requires R-5 zoning.
Sheds & Outbuildings
Some RestrictionsShed permits, setback limits, and outbuilding size rules.
Shed Rules
Some RestrictionsFlorissant treats sheds and storage buildings as accessory structures under the Zoning Code (Chapter 405) supplementary district regulations and the Building Code (Chapter 500). The published Public Works guideline caps shed height at 18 feet, and not exceeding the height of the residence; structures within 6 feet of the house must match the house setback, and any shed of 200 square feet or more requires construction plans submitted with the building permit application.
Fire Pits & Outdoor Structures
Some RestrictionsFire pit placement, outdoor burning restrictions, and permits.
Fire Pit Rules
Some RestrictionsRecreational fire pits are permitted in Florissant following St. Louis County Air Pollution standards: dry seasoned firewood only, base area ≤9 sq ft, smoke must not cross property line. No yard waste or garbage allowed.
Landscaping & Tree Removal
Some RestrictionsTree removal permits, heritage tree protections, and water rules.
Tree Removal & Heritage Trees
Some RestrictionsFlorissant requires a Land Disturbance Permit (Ordinance No. 8748, Chapter 505, Article IX) for land disturbance activities. Disturbances of 1+ acre require a Major Land Disturbance Permit; disturbances under 1 acre require an Ordinary Land Disturbance Permit. Tree removal tied to land disturbance requires this permit.
General Permit Tips
When do you typically need a permit?
Most cities require permits for structural work, including fences over a certain height, pools, ADUs, and sheds above a size threshold. Even projects that seem minor can trigger permit requirements, so it is always best to check first.
How to apply for a building permit
Visit your local building department or their website. Most jurisdictions accept online applications. You will typically need a site plan, project description, and may need contractor information. Processing times vary from same-day for simple projects to several weeks for larger builds.
Common permit violations to avoid
Building without a permit, exceeding approved dimensions, and ignoring setback requirements are the most common violations. Penalties can include fines, required removal of the structure, and complications when selling your home.
Permit Guides for Nearby Cities
Looking for rules beyond permits? View all ordinances we track for Florissant.