High for basic aesthetic applications; moderate for projects involving significant grading, complex drainage, or working near utilities.
Installation of decorative stone and river rock for typical residential landscaping is generally low in complexity. Higher complexity may arise with significant grading changes, extensive drainage systems, or proximity to structural elements requiring specific engineering.
Project Guidelines & Rules
Site Preparation & Grading
5 Rules
Ensure positive drainage away from building foundations and property lines. Finished grade shall slope a minimum of 6 inches in the first 10 feet.
2024 IRC R401.3
Prevent water ponding or accumulation against foundations or in areas that could lead to saturation of soil adjacent to footings.
2024 IRC R401.3
Any retaining wall exceeding 4 feet in height (measured from the bottom of the footing to the top of the wall) requires a permit and engineered design.
2024 IRC R404.1 and local municipality requirements
Footings for frost-susceptible structures (e.g., retaining walls) must extend to DuPage County's prescribed frost depth.
2024 IRC R403.1.1 (DuPage County frost depth: 42 inches below grade)
Prior to any excavation, contact JULIE (Joint Utility Locating Information for Excavators) to identify and mark underground utilities.
Illinois Underground Utility Facilities Damage Prevention Act
Proximity to Building Structures & Materials
3 Rules
Maintain a minimum 6-inch finished grade slope away from the foundation for a minimum of 10 feet, regardless of decorative stone placement.
2024 IRC R401.3
Do not place decorative stone or river rock directly against untreated wood-framed structural components, siding, or stucco without proper moisture barrier and termite inspection clearance. A minimum 6-inch clear space to finished grade is recommended for termite inspection.
2024 IRC R317.1, R406.1
Ensure proper ventilation and moisture control around foundation walls, especially where stone might impede drying or trap moisture.
2024 IRC R406.1
Electrical System Safeguards
3 Rules
All underground electrical conductors covered by decorative stone or river rock must comply with proper burial depth, conduit requirements, and warning tape installation.
2023 NEC 300.5
Maintain clear access and adequate working space around all outdoor electrical panels, disconnects, junction boxes, and outlets.
2023 NEC 110.26
Ensure grounding electrodes and their connections are accessible or properly protected and identified if covered.
2023 NEC 250.68(A)
Plumbing & Drainage System Protection
3 Rules
Maintain clear access to cleanouts for building sewers and drainage systems. Decorative stone or river rock shall not obstruct access.
Illinois Plumbing Code Section 890.130 (Accessibility of Cleanouts)
Protect buried water service lines, sewer lines, and storm drainage piping from damage due to the weight, impact, or shifting of decorative stone or river rock.
Illinois Plumbing Code 890.310, 890.1410 (General protection, bedding, and backfill for buried piping)
Design and install drainage systems (e.g., French drains, dry creek beds using river rock) to effectively convey storm water away from foundations and property lines, preventing erosion or saturation.
2024 IRC R401.3
Permitting & Local Requirements
3 Rules
Projects involving significant grading (e.g., exceeding 50 cubic yards), retaining walls over 4 feet, or modifications to existing storm water management systems may require a permit.
Consult your local municipality's building department for specific requirements.
All decorative stone and river rock installations must adhere to local zoning ordinances, setback requirements, and storm water management regulations.
Consult your local municipality's planning and zoning department.
Certain projects may require inspections by the local building department to ensure compliance with adopted codes.
Contact your local building department for inspection scheduling and requirements.
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