Do I need a building permit
in Chatham, IL?

Do I need a permit in Chatham, Illinois?

What's specific to Chatham permits

Chatham's frost depth of 36 inches is the baseline for any footing or foundation work. Illinois Building Code Section 403.1 requires deck footings and shed foundations to extend below the frost line — so plan on digging to at least 36 inches plus 12 inches of gravel base. This applies to free-standing structures (sheds, detached garages) and attached decks alike. Inspectors will measure the footing depth at framing inspection, so guess-and-check doesn't work. If you're replacing an old structure and want to reuse the existing footings, the inspector will likely require them dug out and verified before approval — glacial till is stable, but a shallow old footing won't meet current code.

The city allows owner-builders to pull permits for owner-occupied residential work, but there are limits. Electrical work requires a licensed electrician to pull the subpermit and sign the inspection card, even if you're doing the labor yourself. Gas work (furnace, water heater, range) must be installed by a licensed gas fitter. Plumbing is similar — a licensed plumber must be listed on the permit. Structural work (additions, roof framing, deck posts) can often be done by an owner-builder if you pull the permit, but the inspector will expect professional-grade work and workmanship. Don't assume "owner-occupied" means "no license required." Call the Building Department before starting; they'll tell you exactly what requires a license for your specific project.

Chatham's online permit portal exists but may require in-person or phone confirmation depending on project type. As of this writing, some routine permits (fences, sheds, water-heater replacements under certain thresholds) might be filed over-the-counter at City Hall or by mail, while more complex work (additions, garage builds, electrical panel upgrades) may require a site visit or formal plan submission. The Building Department phone line is the fastest way to clarify whether your project is simple enough for over-the-counter filing or if it needs full plan review. Bring a sketch or photo when you call — ten seconds of visual description beats three minutes of explanation on the phone.

Plan-review turnaround in Chatham typically runs 2–4 weeks for residential work, faster for minor permits (fences, sheds). If the inspector finds code violations during plan review, you'll get a 'deficiency letter' listing what needs to change. Resubmitting corrections usually takes another week. Framing and electrical inspections are scheduled after the permit is issued; expect 2–3 business days to book an inspection appointment. Final inspection happens after all work is complete, including verification that any required work by licensed trades (electrical, plumbing, gas, HVAC) is signed off. Don't cover walls, bury conduit, or backfill footings before the framing inspector signs off — re-inspection fees apply if you do.

Permit fees in Chatham are typically calculated as a percentage of project valuation plus a base fee. A fence permit usually runs $50–$100 depending on materials and length. A deck permit is usually $150–$400 depending on size and whether electrical or plumbing is involved. A room addition or garage build can be $300–$1,000+ depending on square footage and scope. Always ask for a fee estimate when you call; some projects have fixed fees while others slide with valuation. Plan-check fees are usually bundled into the base permit fee, so you won't see a separate bill for review time.

Most common Chatham permit projects

Chatham homeowners and contractors most commonly pull permits for decks, fences, sheds, room additions, garage builds, water-heater replacements, electrical panel upgrades, and HVAC changes. A few small projects (like interior repaints or appliance swaps) don't need permits. The list below covers the projects we write about most often — each has its own Chatham-specific permit guide on this site. If your project isn't listed, call the Building Department with a description; most will tell you yes or no in under a minute.

Illinois context for Chatham permits

Illinois adopted the 2021 International Building Code (IBC) with state amendments, effective in 2023. This is the code the City of Chatham enforces, though some provisions are modified at the state level. Illinois Department of Labor, Office of Boiler and Pressure Vessel Safety, also oversees HVAC, plumbing, and gas work — meaning certain trades require state licensure in addition to city permitting. Illinois does not have a state electrical licensing board, so electrical work is governed by the National Electrical Code (NEC) and enforced locally; Chatham requires a licensed electrician to pull the electrical subpermit. Illinois allows owner-builders to pull permits for owner-occupied residences, but this does not exempt them from hiring licensed trades for work that requires licensure. Deck and shed projects follow the 2021 IBC Chapter 4 (Foundations, Soils, and Frost Protection) with the state's 36-inch frost-depth requirement for Sangamon County. If your project involves an old property or you're concerned about prior code violations, the Building Department can do a title search or historical inspection to clarify what's already on file — this is free and sometimes worth the phone call if you inherited a property with a sketchy building history.

Common questions