High, suitable for competent DIYers, particularly for sheds under 200 square feet, provided all code requirements for foundations and structural integrity are met.
Simple accessory structure, typically exempt from extensive structural permits if under 200 sq. ft., but requires strict adherence to DuPage County's 42-inch frost depth for foundations and local zoning setbacks.
Project Guidelines & Rules
General Requirements & Permits
3 Rules
Permit Requirement for Accessory Structures
One-story detached accessory structures, provided the floor area does not exceed 200 square feet (18.58 m2), are often exempt from a building permit per IRC R105.2(1). However, zoning compliance, setbacks, and potential electrical permits (if applicable) are still required. Always confirm with your local building department.
Site Plan Submission
A scaled site plan detailing property lines, existing structures, proposed shed location, and distances to property lines/other structures is typically required for zoning review, even if a building permit is not.
Compliance with Zoning Ordinances
All accessory structures must comply with local municipal zoning ordinances regarding setbacks from property lines, easements, and principal structures, as well as maximum allowable height and impervious surface coverage. Consult your local building department.
Foundations & Footings
4 Rules
Frost Protection Depth for Permanent Supports
All foundation walls, piers, and other permanent supports for structures shall extend a minimum of 42 inches (1067 mm) below finished grade to protect against frost heave, reflecting DuPage County's established frost line. IRC R403.1.4.1
Foundation Material & Construction
Foundations shall be constructed of materials such as concrete, treated wood, or masonry, designed to support the shed's loads without settlement. Skids directly on grade are permissible for non-permanent or small, exempt structures, but for longevity in DuPage County, proper frost-protected foundations are highly recommended. IRC R403
Anchorage of Structure to Foundation
Where a foundation system is used, the shed structure must be adequately anchored to the foundation to resist uplift and lateral forces (e.g., wind). This typically involves anchor bolts embedded in concrete or approved connectors for treated wood foundations. IRC R403.1.6
Protection Against Decay and Termites
Wood members that are in contact with the ground or concrete that is in contact with the ground, or within 6 inches (152 mm) of the ground, shall be approved pressure-preservative-treated wood. IRC R317.1
Structural Framing
3 Rules
Lumber Species, Grade, and Dimensions
All structural lumber shall be of a species and grade suitable for its intended use and sized according to engineering principles or prescriptive tables in the IRC (e.g., floor joists IRC Table R502.3.1(1), wall studs IRC Table R602.3(1), roof rafters IRC Table R802.5.1(1) for typical applications) considering DuPage County's snow and wind loads.
Fastening Schedule
Connections between framing members shall follow the minimum fastening schedule specified in IRC Table R602.3(1).
Load Design (Snow and Wind)
The structure must be designed to withstand DuPage County's specific climatic loads, including a minimum ground snow load (e.g., 30 psf) and basic wind speed (e.g., 115 mph 3-second gust exposure B or C). IRC R301.2
Roofing
2 Rules
Roof Sheathing
Roof sheathing (e.g., plywood or OSB) shall be of adequate thickness and fastened according to IRC R803.1 and Table R803.1 for the intended roof covering and design loads.
Roof Covering Materials
Roof coverings shall meet the requirements of IRC Chapter 9. Common materials like asphalt shingles or metal roofing are acceptable if installed according to manufacturer's instructions and code standards.
Electrical (If Applicable)
4 Rules
Permit for Electrical Work
Any installation of electrical wiring, fixtures, or receptacles within the shed requires a separate electrical permit and inspection from your local building department. NEC 90.1(B)
Wiring Methods for Detached Structures
Wiring to a detached accessory structure, whether underground or overhead, must conform to NEC Article 225 (Outside Branch Circuits and Feeders) and Article 300 (Wiring Methods). Underground wiring must meet depth requirements. NEC 300.5
Grounding and Bonding
All electrical installations, including panels, circuits, and equipment, shall be properly grounded and bonded according to NEC Article 250.
GFCI Protection for Receptacles
All 125-volt, 15- and 20-ampere receptacles installed outdoors or in damp/wet locations within the shed must be ground-fault circuit-interrupter (GFCI) protected. NEC 210.8(B).
Fire Safety & Clearance
2 Rules
Separation from Main Dwelling and Property Lines
Accessory structures are subject to fire separation distances from property lines and other buildings as defined by your local municipality's zoning code and IRC R302.1 for exterior walls, to limit fire spread.
Storage of Combustible Materials
While firewood is combustible, a properly constructed and ventilated shed for typical residential quantities does not generally trigger specific additional fire code requirements beyond proper setbacks. Ensure good air circulation to prevent excessive moisture and decay.
Plumbing (Not Typically Applicable)
1 Rules
Plumbing Fixtures
Basic firewood storage sheds typically do not include plumbing fixtures. If any plumbing (e.g., a utility sink or hose bib) is desired, it must comply with the Illinois Plumbing Code, requiring a separate permit and inspection. Refer to Illinois Plumbing Code Section 890.
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