Landscaping is more than curb appeal—it’s also a matter of compliance. In St. Louis County, Missouri, property owners, builders, and landscape contractors must adhere to a variety of landscaping regulations set forth by local municipalities and the St. Louis County Department of Transportation and Public Works.
Whether you’re installing a new patio, designing a retaining wall, or updating a commercial property’s green space, it’s essential to understand and follow local codes to avoid fines, project delays, or costly do-overs. This guide outlines key landscaping requirements in St. Louis County and offers tips for maintaining both beauty and legal compliance.
Why Landscaping Regulations Matter
Landscaping ordinances are designed to protect public safety, prevent erosion, enhance stormwater control, and preserve the community’s visual character.
Regulations apply to both residential and commercial landscaping projects and often cover areas such as:
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Tree planting and removal
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Setbacks and property lines
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Drainage and erosion control
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Retaining wall construction
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Fencing and screening
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Landscaping in easements and rights-of-way
By following these rules, property owners not only stay in compliance but also improve their property’s functionality and long-term value.
Zoning and Permitting for Landscape Projects
In St. Louis County, landscape design and installation must comply with the Unified Development Ordinance (UDO), which governs land use, setbacks, and stormwater management. Before beginning any major landscaping project, it’s crucial to check whether a land disturbance permit, grading permit, or building permit is required.
You can access these guidelines on the St. Louis County Planning Department website: https://stlouiscountymo.gov/st-louis-county-departments/planning
When Permits Are Typically Required
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Retaining walls over 3–4 feet in height
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Any structure (patios, outdoor kitchens, fire pits) connected to utilities
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Drainage modifications impacting neighboring properties
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Land disturbance over 30,000 square feet, per county ordinance
Failing to obtain the correct permits can result in stop-work orders and administrative penalties.
Tree Preservation and Native Plant Guidelines
Tree protection is a key concern in many municipalities across St. Louis County. Subdivisions like Kirkwood, Webster Groves, and Clayton have strict tree preservation ordinances.
Property owners may be required to:
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Maintain a minimum number of canopy trees
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Submit a landscape plan showing species and placement
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Replace trees removed due to construction or damage
Native plants are increasingly promoted as part of sustainable landscaping practices. The Missouri Botanical Garden’s PlantFinder encourages the use of drought-tolerant, pollinator-friendly species like purple coneflower, prairie dropseed, and serviceberry, which require less water and support local ecosystems.
Stormwater Management and Drainage Compliance
Improper drainage is one of the most common landscaping violations in St. Louis County. Any project that alters natural water flow may need to meet Storm Water Management Plan (SWMP) standards, especially near easements or public rights-of-way.
According to the St. Louis Metropolitan Sewer District (MSD), improper grading can lead to soil erosion, basement flooding, and foundation damage. Drainage improvements—such as French drains, dry creek beds, and rain gardens—must be properly engineered and often reviewed for approval.
Professional landscapers like Big Bend Landscaping specialize in designing drainage systems that not only solve water problems but meet county inspection requirements.
Hardscape Compliance: Patios, Walls, and Outdoor Kitchens
Hardscape elements such as patios, walkways, retaining walls, and fire features must follow building codes and setback rules, particularly near property boundaries or utility lines.
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Retaining walls must be structurally sound and may require a certified engineer’s design.
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Outdoor kitchens and fire pits must be located safely away from structures and often require gas line permits.
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Decks and patios may be subject to impervious surface limits, particularly in environmentally sensitive areas.
Using a professional landscape design-build company ensures that materials, grading, and installation techniques all conform to local and state codes.
Need Help Navigating Landscaping Requirements in St. Louis County?
Big Bend Landscaping offers professional, code-compliant landscaping solutions throughout St. Louis and surrounding communities.
Contact us today to schedule a consultation and ensure your next landscaping project meets every local requirement—beautifully and legally.
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