Codes, exemptions & field inspections
This guide translates the available agency record into a preconstruction checklist for structural scope, minor work, and inspection release. The adopted code and the issuing official control when a field condition is disputed.
Regulatory framework
For new building permit applications, effective January 1, 2023: 2021 International Residential, Building, Fire, Mechanical, Fuel-Gas, Existing Building, and Swimming Pool and Spa codes; 2020 National Electrical Code; Illinois State Plumbing Code; Illinois Energy Conservation Code; and Illinois Accessibility Code, with county amendments.
Inspection lane
Apply and manage permits and inspection results through the county SmartGov portal. The Building Division conducts field inspections; contact Planning and Development at 815-334-4560 or plandev@mchenrycountyil.gov for scheduling questions.
Minor-work playbook
Permits are generally required for privacy fences, decks, sheds, pools, garages, driveways, patios, and wind turbines. The county FAQ lists no permit for re-shingling a roof, siding, same-size replacement windows, non-privacy fences that are at least 50% open, wooden play sets or swing sets, and sheds under 150 square feet that meet setbacks.
Field rule
A permit exemption generally addresses one narrow construction trigger. It does not automatically waive zoning, land-use, floodplain, shoreline, fire, energy, electrical, utility, septic, or right-of-way requirements. Obtain written confirmation when the project involves a new structure, structural alteration, change in occupancy, or concealed work.
Inspection pipeline
Request with lead time
Apply and manage permits and inspection results through the county SmartGov portal. The Building Division conducts field inspections; contact Planning and Development at 815-334-4560 or plandev@mchenrycountyil.gov for scheduling questions.
Preserve access
Do not cover framing, reinforcement, wiring, piping, damp-proofing, or life-safety work until the required inspection has been completed and documented.
Close the record
Retain the approved plans, inspection approvals, correction responses, and final certificate or occupancy release with the property file.
Contractor verification
Use the state licensing system to verify active registration, trade credentials, bond status, and liability coverage where available. Match the legal business name to the proposal and permit application.
Planning reference
A building permit is only one part of statutory compliance. Check the local zoning, ordinance, map, or land-use reference before finalizing setbacks, height, lot coverage, access, drainage, or accessory structure placement.
Open planning reference ↗Source trail
Use these direct agency or licensing links to confirm current instructions before you file, pay, or schedule work. External pages control if their information differs from this directory.
Project questions
McHenry County Department of Planning and Development, Building Division is the identified county-level authority for this profile. Confirm that the property is in its service area before filing.
Begin with the online permit gateway listed in the application guide. If the portal does not recognize the address or project type, contact 815-334-4560.
The Building Division strives to complete building-permit reviews within 10 business days of application when the submission is complete. Zoning, stormwater, and plan review may extend the time.
Apply and manage permits and inspection results through the county SmartGov portal. The Building Division conducts field inspections; contact Planning and Development at 815-334-4560 or plandev@mchenrycountyil.gov for scheduling questions.
For new building permit applications, effective January 1, 2023: 2021 International Residential, Building, Fire, Mechanical, Fuel-Gas, Existing Building, and Swimming Pool and Spa codes; 2020 National Electrical Code; Illinois State Plumbing Code; Illinois Energy Conservation Code; and Illinois Accessibility Code, with county amendments. Permits are generally required for privacy fences, decks, sheds, pools, garages, driveways, patios, and wind turbines. The county FAQ lists no permit for re-shingling a roof, siding, same-size replacement windows, non-privacy fences that are at least 50% open, wooden play sets or swing sets, and sheds under 150 square feet that meet setbacks.
Field sequencing matters
Code compliance is not only a plan-review exercise. Footings, reinforcement, framing, fireblocking, wiring, piping, insulation, weather protection, and life-safety systems each have points where the work must remain accessible. Build the inspection calendar into the trade schedule instead of treating it as a final administrative step.
When a project qualifies for a narrow minor-work exemption, keep a written explanation of why it qualifies and confirm that related zoning, utility, fire, energy, or environmental rules do not create a separate approval requirement.
Closeout file
Keep the approved plan set, inspection approvals, correction responses, contractor license verification, final certificate, and any occupancy release together. A clean record protects the owner, builder, lender, insurer, and future buyer.