Most kitchen updates around Chicago's northwest suburbs fall into one of two buckets: like-for-like swaps, which usually need no permit, and anything that moves or adds plumbing, wiring, or walls, which almost always does. The line between the two is drawn by your municipality — not the state — so the final answer is always one phone call to your local building department. We work across dozens of these towns, and here is the pattern.

The like-for-like rule

Replacing finishes in the same footprint is generally treated as cosmetic: new countertops on existing cabinets (our bread and butter — the typical countertop swap we do needs no permit), repainting or replacing cabinets without touching wiring or pipes, backsplash tile, flooring, and paint. Chicago, for example, does not require a permit for repairs that use the same materials and configuration, cabinet and countertop installation with no electrical or plumbing connections, or replacing sinks, faucets, and water heaters in buildings of four or fewer units.

Three common triggers flip a "cosmetic" job into a permitted one:

Moving anything wet. Relocating the sink or dishwasher, adding an island prep sink, or rerouting drains is a plumbing alteration. In Illinois this work must also be done by a state-licensed plumber under the Plumbing License Law, wherever you live. When a countertop project of ours grows a new prep sink, this is the conversation we start early.
New circuits. Modern kitchen code expects two dedicated 20-amp small-appliance circuits and GFCI protection at countertop receptacles, so layout changes and appliance upgrades frequently require electrical permits and a licensed electrician.
Walls. Opening or removing any wall — especially load-bearing — puts you into structural review, often with architect-prepared drawings.

Municipal rules, county registration

Permitting is municipal, and the suburbs are often stricter than the city. Buffalo Grove, a representative northwest suburb, requires a permit to replace or modify a kitchen — cabinet replacement typically triggers it because plumbing and electrical get disturbed — with plan review in about 7–10 business days and fees around $200–$350 for a kitchen-only project (as of mid-2026). Unincorporated Cook County requires drawings, signed letters of intent from every contractor, and Cook County contractor registration — including homeowners doing their own work. Chicago runs an expedited "Easy Permit Process" for repair-scope work that needs no architectural plans, with electrical and plumbing sub-permits pulled by licensed trades. Your own village will have its own quirks; ask before demolition, not after.

Shopping across state lines?

Some of our readers compare notes with family in Wisconsin or Indiana, so one honest aside: the rules genuinely differ there. Wisconsin runs a single statewide Uniform Dwelling Code with state-certified contractor credentials; Indiana has no statewide general-contractor license and leaves permitting entirely to cities and counties. Neither state's habits transfer to Illinois — and an Illinois quirk that surprises out-of-state relatives is that plumbing work here requires a state-licensed plumber no matter which town you live in. If your project is outside Illinois, call that jurisdiction's building department; the like-for-like principle travels well, the paperwork does not.

Who should pull the permit?

The permit holder is the party the inspector holds responsible. A contractor who asks you to pull the permit "to save time" is usually dodging registration, licensing, or accountability — treat it as a red flag everywhere. When permitted trades are on a project we are part of, the licensed contractor pulls their own permit. That is how it should work on your job too.

What skipping permits really costs

Unpermitted work surfaces at the worst times: Chicago fines run $1,000 for a first offense up to $10,000 for repeat violations; insurers can contest claims tied to unpermitted systems; and at resale, buyers and lenders ask for permit history, forcing retroactive permits or price cuts. Rough-in inspections also protect you — they check the plumbing and wiring before drywall hides them. A permit is cheap insurance that someone independent looked at the riskiest parts of your remodel. We would rather lose a week to plan review than have your kitchen become a fine with cabinets.

Sources

Illinois Plumbing License Law (225 ILCS 320) — Illinois General Assembly
Interior Remodel Minimum Requirements — Cook County Department of Building and Zoning
Kitchen, Bathroom & General Remodel (Residential) — Village of Buffalo Grove, Illinois
What Are the Different Types of Renovation Permits in Chicago? — City Bureau
One- & Two-Family Uniform Dwelling Code — Wisconsin Department of Safety and Professional Services
Indiana Code Title 24, Art. 5, Ch. 11 — Home Improvement Contracts — Indiana General Assembly via Justia

Kitchen Remodel Permits in Chicago's Suburbs: When You Actually Need One