Do I Need a Permit for Landscaping in Boise?

When Landscaping Permits Are Required

The City of Boise requires permits for certain landscaping projects to ensure safety, compliance with building codes, and environmental protection. Understanding permit requirements helps avoid costly fines and ensures your project is done safely and legally.

General landscaping like planting shrubs, installing flower beds, and creating pathways typically don't require permits. Structural improvements and modifications to drainage or grading often do. When in doubt, contact the City of Boise Development Services Department.

Projects That Require Permits

Retaining Walls

Retaining walls over 4 feet tall typically require structural permits. Walls under 4 feet that are set back from property lines may not require permits, but check with the city.

Permit requirements exist because improperly designed or constructed retaining walls can fail catastrophically, endangering people and property. Walls require engineering to account for soil type, water drainage, and load factors.

Landscape Grading and Fill

Significant changes to your property's grade or adding fill material may require permits, particularly if it affects drainage or neighbors' properties. The city wants to ensure proper drainage and erosion control.

Irrigation System Installation

New irrigation systems may require permits from Boise's Utility Department, particularly if they connect to municipal water lines or affect property drainage. A permitted system is safer and more likely to comply with water conservation requirements.

Tree Removal

Removing certain trees may require permits, particularly protected species or heritage trees. Boise has regulations protecting mature trees on private property. Contact the city arborist before removing large or older trees.

Storm Drain Work

Any work affecting storm drains, detention ponds, or wetlands requires permits and environmental review. These features protect water quality and prevent flooding.

Property Line Work

Projects near property lines, including walls, fences, and drainage modifications, often require permits to ensure they don't encroach on neighbors' property or cause problems.

Projects That Typically Don't Require Permits

• Planting trees, shrubs, and perennials
• Installing simple flower beds and raised planters
• Installing ground-level pathways and stepping stones
• Applying mulch to existing beds
• Minor landscaping improvements and seasonal maintenance
• Installing drainage rock or gravel

The Permit Process in Boise

Step 1: Determine if You Need a Permit

Contact the City of Boise Development Services Department or visit their website. Describe your project and ask if a permit is required. They can provide guidance on permit requirements and fee estimates.

Step 2: Prepare Project Plans

Complex projects like retaining walls may require engineering plans or drawings showing the scope of work, materials, and construction details. A landscape contractor or engineer can prepare these.

For simpler projects, a site plan sketch showing what you're planning may be sufficient, along with project description.

Step 3: Submit Permit Application

Submit your application and plans to Development Services, along with the applicable permit fee. Fees vary based on project scope. The city will review your application for code compliance.

Step 4: Plan Review and Approval

The city may request modifications or additional information. Work with Development Services to address any concerns. This process typically takes 5-10 business days for simple projects.

Step 5: Receive Permit and Begin Work

Once approved, you receive a permit. Keep it on-site during work. For projects requiring inspections, the city will schedule inspection appointments at specified completion stages.

Step 6: Final Inspection

Once your project is complete, request final inspection. The city will verify that work complies with the permit and building codes. Once approved, your permit is closed.

Retaining Wall Permit Requirements

Wall Height Thresholds

• Under 4 feet: May not require permit if meets setback requirements (check with city)
• 4-8 feet: Requires structural design and permit
• Over 8 feet: Requires professional engineering and drainage design

Retaining Wall Design Considerations

Boise's clayey soil and freeze-thaw cycles require careful wall design. Proper drainage behind the wall is essential to prevent water pressure buildup. Wall materials must resist the pressure from the retained soil. Professional design accounts for these factors.

A structural engineer calculates required wall thickness, reinforcement, and drainage based on soil type, wall height, and loads. This engineering is required for permits and ensures the wall will be stable and durable.

Irrigation System Permits

New irrigation systems connecting to municipal water lines typically require permits. This ensures proper cross-connection prevention and compliance with water conservation standards. Permitted systems must have backflow preventers and proper metering.

Contact Boise Water (the municipal water utility) to understand permit requirements for your specific system design.

Tree Removal Regulations

Boise protects certain trees on private property. Trees over 24 inches in diameter may require a permit for removal. Heritage trees (older specimens with historical significance) have additional protections.

The City Arborist can advise whether a specific tree is protected. If protected, you'll need a permit to remove it and may need to submit a tree care plan for preservation.

Cost of Permits

Permit fees vary based on project scope. Simple projects may cost $50-200. Complex projects with engineering may cost $500-2,000+. Contact Development Services for specific fee estimates.

Permit costs are typically small compared to project costs, and obtaining permits protects you legally and ensures proper construction.

Working with Licensed Contractors

Professional landscaping contractors are familiar with Boise permit requirements and handle permit acquisition as part of their service. Using a licensed contractor ensures your project meets code requirements and is permitted properly.

Some homeowners do DIY landscaping projects. If you do, understand your permit obligations. Unpermitted work can create problems when selling your home or if something goes wrong.

Boise Development Services Contact Information

For permit questions and applications, contact the City of Boise Development Services Department. They can answer questions about your specific project and guide you through the permit process.