Ballwin Zoning & Land Use Guide
Official references and local checks
Use the official references below to identify the rules that apply to your address, then confirm parcel-specific requirements with the local authority before filing an application.
Official references
- Population:
- 31,805
- County:
- St. Louis County
- State building code:
- No mandatory statewide building code; local adoption(statewide default)
- State ADU law:
- No statewide override; local rules apply
- FEMA flood map:
- Search flood zones
- Planning department:
- Ballwin Planning & Zoning Commission
- Municipal code:
- View code online
Before you apply
- Call the Ballwin Planning & Zoning Commission: (636) 227-8950
- Search the municipal code for the chapter that covers your zoning district and proposed use.
- Check FEMA flood zone for your parcel — flood-zone status changes setbacks, foundation requirements, and insurance.
- Check your HOA CC&Rs and recorded deed restrictions — they are common in Ballwin and frequently restrict ADUs, fences, and exterior changes beyond what zoning allows.
Key Zoning Facts
Ballwin is a city of approximately 31,800 residents in St. Louis County, Missouri. Land use and development are regulated through the city's zoning ordinance, codified in Chapter 405 of the Ballwin Municipal Code. The code divides the city into seven primary zoning districts -- five residential (R-1 through R-5) and two commercial (C-1 and C-2) -- each with specific standards for lot size, setbacks, height, and permitted uses.
Residential Zoning Districts
Ballwin's residential districts are all single-family except for R-5, which permits multi-family development. Lot size requirements range from 30,000 square feet in the R-1 district down to 6,000 square feet in R-5. All residential districts share a maximum building height of 35 feet.
| District | Type | Min Lot Size | Front Setback | Side Setback | Rear Setback | Max Height |
|---|---|---|---|---|---|---|
| R-1 | Single-Family | 30,000 sq ft | 50 ft | 15 ft | 40 ft | 35 ft |
| R-2 | Single-Family | 15,000 sq ft | 35 ft | 10 ft | 30 ft | 35 ft |
| R-3 | Single-Family | 10,000 sq ft | 30 ft | 8 ft | 25 ft | 35 ft |
| R-4 | Single-Family | 8,000 sq ft | 25 ft | 6 ft | 25 ft | 35 ft |
| R-5 | Multi-Family | 6,000 sq ft | 25 ft | 6 ft | 25 ft | 35 ft |
Commercial Zoning Districts
The C-1 (Commercial) and C-2 (General Commercial) districts accommodate retail, office, and service uses. The C-2 district allows a broader range of uses and permits buildings up to 45 feet in height, compared to 35 feet in C-1. Both commercial districts require a 25-foot front setback, 10-foot side setbacks, and a 20-foot rear setback.
ADUs (Accessory Dwelling Units)
Ballwin does not currently have a specific ordinance authorizing ADUs (Accessory Dwelling Units). Missouri has no statewide ADU mandate, so local jurisdictions set their own rules. While accessory structures like detached garages and sheds are permitted under general zoning provisions, constructing a separate dwelling unit within an accessory building is not expressly allowed. Property owners interested in adding a secondary dwelling should contact the Planning & Zoning Commission for guidance.
Development Process
Development in Ballwin generally requires obtaining the appropriate permits from the city's planning and building departments. The process typically involves:
- Zoning Verification -- Confirm that your proposed use is permitted in the applicable zoning district by reviewing Chapter 405 of the municipal code or contacting the Planning & Zoning Commission
- Site Plan Review -- For commercial and multi-family projects, submit a site plan for review by the Planning & Zoning Commission
- Building Permit -- Apply for a building permit with construction documents that comply with the 2018 IBC/IRC as locally adopted
- Inspections -- Schedule required inspections during construction
- Certificate of Occupancy -- Obtain final approval before occupying the structure
For projects that do not conform to existing zoning, property owners may need to seek a variance or rezoning through the Board of Adjustment or Planning & Zoning Commission.
Key Considerations
Before starting any development project in Ballwin, property owners should:
- Verify the zoning classification of their property through St. Louis County GIS or by contacting the city
- Review setback, height, and lot coverage requirements for their specific zoning district
- Check for any overlay districts or special regulations that may apply
- Determine if the property is in a flood zone using FEMA's Flood Map Service Center
- Confirm whether HOA covenants or deed restrictions apply -- many Ballwin subdivisions have active HOAs
- Contact the Planning & Zoning Commission at (636) 227-8950 for pre-application guidance
Disclaimer: This guide provides general information about zoning in Ballwin and should not be relied upon as legal advice. Zoning codes are subject to change. Always verify current regulations with the Ballwin Planning & Zoning Commission or the municipal code before making development decisions.
Regulatory Layers That Apply in Ballwin
Your property is subject to ALL of these regulatory layers. Each one can impose additional requirements beyond the others.
Federal
- FEMA flood mapping: check parcel-specific flood-zone status
- View FEMA Flood Map
State — Missouri
- Building Code: IBC/IRC (locally adopted with amendments)
County — St. Louis County
- Role: County-level property records, tax assessment, and GIS mapping services. St. Louis County GIS covers Ballwin parcels.
City / Municipal
The municipality's zoning ordinance, building-code enforcement, and local permits form the primary local layer of land-use regulation for your property.
Overlay Districts
No overlay districts identified.
Private Restrictions
- Private covenants, deed restrictions, condominium rules, or association rules can impose requirements beyond zoning.
- Many Ballwin subdivisions have active HOAs with CC&Rs that may impose restrictions beyond city zoning, including architectural review requirements.
Statewide Context (Missouri)
Local data for Ballwin is limited. The following state-level facts apply across Missouri and are inherited by this page until city-specific details are verified.
- State Building Code
- No mandatory statewide building code; local adoption
- State ADU Preemption
- No statewide override
- Coastal Zone
- No
- Wildfire Zones
- No
Permit Costs & Timelines
Check Current Permit Fees & Timelines
Permit fees and review times can vary by project type, scope, valuation, and required approvals. Check the current schedule with the local permitting authority before filing.
Check current Ballwin permit information →Official Sources
City-specific