Moderate for experienced DIYers with heavy equipment access, but professional consultation for excavation, drainage engineering, and code compliance is highly recommended due to potential complexities with soil, water management, and safety.
Requires significant excavation, proper drainage design to prevent water accumulation, and adherence to structural safety standards for the pit and trampoline frame. Consideration of DuPage County's 42-inch frost depth is critical for any permanent structural supports.
Project Guidelines & Rules
1. Planning & Permitting
4 Rules
Permit Application
Your local municipality requires a building permit for significant site alterations and structural elements, including excavation for in-ground structures. (IRC R105.1, Local Ordinance)
Utility Locates
Contact JULIE (Joint Utility Locating Information for Excavators) at least 48 hours (two working days) prior to any excavation. (IL Statute 220 ILCS 50/1 et seq.)
Property Setbacks
Verify setback requirements from property lines, principal structures, and accessory structures with your local zoning department. (IRC R302.1, Local Zoning Ordinance)
Site Plan
A detailed site plan showing the proposed trampoline location, dimensions, setbacks, and existing structures must be submitted with the permit application to the local building department. (Local Building Department Requirement)
2. Site Preparation & Excavation
6 Rules
Excavation Depth and Size
Pit dimensions must safely accommodate the trampoline structure and allow for adequate drainage and air circulation around the jumping surface. (IRC R102.1, R104.1)
Frost Depth Compliance
Any structural elements supporting the trampoline frame or pit walls that bear directly on soil must extend to the minimum frost depth of 42 inches below grade for DuPage County, or be adequately protected from frost heave. (IRC R403.1.1 - Footings and Foundations)
Soil Bearing Capacity
Foundation or support structures must be placed on undisturbed soil or engineered fill with adequate bearing capacity, suitable for the intended load. (IRC R401.4, R403.1 - Soil and Footings)
Drainage System
A robust drainage system (e.g., gravel base, French drain, sump pump system) must be installed within the pit to prevent water accumulation, ensuring the pit remains dry. Discharge should be directed away from foundations and neighboring properties, preventing erosion. (IRC R405.1 - Foundation Drainage, adapted for pit)
Pit Wall Stability
Excavated pit walls must be stable, either through natural soil integrity, or by utilizing retaining walls or shoring designed to withstand anticipated lateral earth pressures. (IRC R404.1 - Foundation Walls, adapted for pit walls)
Clearances
Maintain adequate clearance from overhead utility lines, trees, and other structures as per manufacturer recommendations and local zoning ordinances. (2023 NEC 230.9, IRC R302.1)
3. Structural & Safety
4 Rules
Manufacturer's Specifications
The trampoline must be installed strictly according to the manufacturer's written installation instructions and specifications. (IRC R104.1 - General, R301.1 - Design)
Anchoring
The trampoline frame, if required by the manufacturer or deemed necessary for stability, must be securely anchored to prevent movement or uplift due to wind or use. (IRC R301.1 - General Structural Integrity)
Safety Surfacing (Recommendation)
While not universally mandated for in-ground installations, surrounding the trampoline perimeter with resilient surfacing (e.g., rubber mulch, sand, wood chips) is strongly recommended to mitigate injury risk from falls. (Good Safety Practice)
Barriers/Fencing
Consult your local municipality regarding any requirements for safety barriers or fencing around the trampoline area, especially if local ordinances classify it as an 'attractive nuisance.' (Local Zoning/Ordinance, IRC R301.1 - General Safety)
4. Electrical Requirements (If Applicable)
4 Rules
Underground Wiring Depth
All underground wiring for any trampoline accessories (e.g., lighting, pumps) must comply with 2023 NEC Article 300.5 for minimum cover requirements based on wiring methods and conditions. (2023 NEC 300.5)
GFCI Protection
All 120-volt, 15- and 20-ampere receptacles installed outdoors or in damp/wet locations serving the trampoline area must be Ground-Fault Circuit-Interrupter (GFCI) protected. (2023 NEC 210.8(A), 210.8(B))
Wiring Methods for Wet/Damp Locations
Conductors and electrical equipment installed in damp or wet locations within or around the trampoline pit must be suitable for such environmental conditions. (2023 NEC 300.6)
Equipment Grounding
All non-current-carrying metal parts of electrical equipment associated with the trampoline must be properly bonded and grounded in accordance with 2023 NEC Article 250. (2023 NEC 250)
5. Specific Plumbing Considerations (If Storm Drain Connection)
1 Rules
Storm Drainage System Connection
If the trampoline pit's drainage system is designed to connect to a public or private storm sewer system, such connections must comply with the requirements for storm drainage systems. (Illinois Plumbing Code 890.130 - Storm Drainage, 890.1310 - Subsurface Drains)