CHICAGO · CHIMNEY CODES & PERMITS GUIDE

The Chicago-Area Chimney Permit Process — Explained Before the Project Starts, Not After

Which chimney projects need a permit, and who issues it — in plain language. Chicagoland is more than 200 municipalities, so the answer depends on your address as much as your project. ChimTech identifies the authority having jurisdiction, files there directly, and delivers a passed inspection record at close-out, so the documentation travels with your home.

WHAT REQUIRES A PERMIT

Every Chimney Permit Trigger in Plain Language

Four categories of chimney work normally require a permit. The categories hold across the metro; the office you file with changes with the municipality.

New Liner Installation

The most common trigger — connecting a heating appliance to a modified flue. It is normally classified as a mechanical permit, required before the liner goes in, not after. See chimney liner installation.

New Fireplace Construction

Building a new wood-burning or gas fireplace — the unit, firebox, and chimney system serving it. Structural framing work adds a separate building-permit layer. See fireplace installation.

Chimney Removal Affecting Roofline or Framing

Removing a chimney to the roofline, or one that ties into structural framing — both require a permit, and the scope depends on how far the removal goes. See chimney removal.

Fuel-Type Conversion With Resizing

Wood-to-gas or oil-to-gas often requires resizing the liner — and that resizing triggers a mechanical permit, even when the appliance swap alone may not. See chimney relining.

What doesn’t require a permit: routine cleaning, standard Level 1 and Level 2 inspections, mortar repointing, crown repair, flashing repair, cap replacement, and waterproofing. The detail most homeowners miss is that the category for most liner installs is a mechanical permit, not a standard building permit — a distinction that matters when a title company confirms permit status at closing.

4 Categories

Require a Permit

Mechanical Permit

Not a Standard Building Permit

Filed Direct

To Your Authority Having Jurisdiction

Two Documents

Permit + Passed Inspection

IT SURFACES AT CLOSING

Homeowners Who Skip the Permit Pay for It When They List

In Illinois, a known unpermitted change to a home’s fire systems can be a material defect a seller has to disclose.

The Illinois Residential Real Property Disclosure Act (765 ILCS 77) requires sellers to disclose known material defects on a standard form — conditions with a substantial adverse effect on value, or that would significantly impair the health or safety of future occupants. Unpermitted work on a chimney or flue can meet that bar. Here’s how it surfaces: a buyer’s inspector flags the liner — materials fine, install fine — but there is no permit on file with the municipality. The agent asks for documentation, there is not any, and the deal stalls. We are not attorneys and this is not legal advice; your real estate attorney is the right person to advise on a specific disclosure.

Resolving it after the fact isn’t simple. The city may require an as-built inspection with camera access to a liner already inside the flue; if the work can’t be confirmed without opening a wall, the cost of reaching passed-permit status multiplies fast.

The permit itself — filed before the project — is straightforward. ChimTech files directly with whichever office has jurisdiction over your property, with no third-party expediter, and you receive a permit copy and the passed inspection record at close-out. Those two documents travel with the home and answer the disclosure question before it becomes a problem.

THE FULL PICTURE

What the Permit Process Actually Involves

Filing a chimney permit is a three-step process wherever the property sits — the difference is which counter it goes to.

Filing the Permit Application

The application goes to the authority having jurisdiction before work begins — the City of Chicago Department of Buildings inside city limits, or your village or city building department outside it. It identifies the property, scope of work, the appliance (type, BTU output, fuel type), and the liner specification, and is broader for new fireplace construction. Inside Chicago, masonry chimney work runs under the Chicago Construction Codes and normally requires a licensed mason contractor; suburban codes are typically based on the International Residential Code with local amendments. Either way NFPA 211 governs liner sizing, so the calculation happens before installation — oversizing on an exterior run produces condensation.

The City Inspection

After the work is completed, a municipal inspector confirms it matches the approved scope and meets code — typically with camera access to verify liner continuity and connection points. It's a required step: a permit that never receives a passed inspection is an open permit, and open permits show up on title searches and create the same closing problems as no permit at all. ChimTech schedules the inspection as part of close-out.

Documentation Delivery

After the inspection passes, the homeowner receives the permit copy and the passed inspection record — formatted to attach to a property file, share with a real estate attorney, or submit to an HOA property manager. They don't expire. For HOA-managed properties — and Chicagoland has a lot of them — ChimTech produces documentation that satisfies both the municipal record requirement and the association file requirement in a single close-out.

WHERE IT COMES UP

Common Scenarios Where the Permit Question Arises

Three situations Chicago-area homeowners encounter most often.

SCENARIO 1

Liner Install Before a Home Sale

An oil-to-gas conversion needs a smaller liner; the work gets done, no permit pulled. Two years later the buyer's inspector flags it as unpermitted and the title company holds the transaction. The homeowner is now filing retroactively and inspecting a liner already in the flue — weeks and significant cost the original permit would have avoided.

SCENARIO 2

Fireplace Addition in a Bungalow

A 1905–1930 bungalow in Portage Park or a greystone in Logan Square adds a fireplace to an existing furnace-flue chase — new firebox, smoke chamber, and connection. That's new fireplace construction; it triggers a permit (and a structural review if framing changes). Using an existing chase does not make it permit-exempt — the fireplace is the trigger.

SCENARIO 3

Removal, or Work in a Landmark District

Removing a chimney serving a decommissioned furnace: to the roofline requires a permit; below the roofline with attic-framing patching requires a permit and a structural review. And if the property sits in a Chicago landmark district — Beverly/Morgan Park, Pullman, Old Town, the Logan Square boulevards — exterior work on a visible chimney can add a Commission on Chicago Landmarks review on top of the permit. Confirming scope before demolition prevents mid-project surprises.

FROM THE FOUNDER

What Brian Dobuis Has Seen When the Permit Step Gets Skipped

The permit conversation goes two ways — and only one of them is calm.

“The permit is the documentation that travels with your home. It’s the difference between a clean disclosure and a title hold.”

— BRIAN Dobuis, FOUNDER, CHIMTECH

The straightforward version: the homeowner asks before the project, we confirm what’s required, we file the permit, the municipality inspects, and the homeowner gets the documentation — nothing interesting happens. The harder version: I’ve talked to homeowners three days from closing who had just learned their liner install has no permit on file. The work was done correctly — right liner, right sizing, right materials — but no permit was pulled, and now they are trying to determine whether there is any path to a passed inspection before the closing date. Sometimes there is; sometimes there is not. ChimTech files permits for every project that requires one. That is how the work is supposed to be done.

BRING US IN EARLY

When to Bring ChimTech Into the Permit Process

Contact ChimTech before the project begins — not after the liner is already in.

If you’re planning a liner installation for a new gas appliance, a new fireplace build, or a full chimney removal, the permit question should be answered at the estimate stage. ChimTech confirms which code applies to your address and what it requires for your specific scope before any work is scoped or scheduled. If work was already done and you are unsure whether a permit was pulled, a permit status check is a straightforward call to the building department — and knowing your status before you list gives you time to resolve gaps without a closing deadline.

For properties under HOA or condo board management, ChimTech’s documentation package covers both the municipal permit record and the association fire-code compliance requirement — one project, one close-out document set, two filing requirements satisfied.

WHERE WE WORK

Where ChimTech Files Permits Across Chicagoland

Give us the address and we will confirm which building department has jurisdiction and what your project needs before anything is scheduled.

City of ChicagoOak ParkBerwynEvanstonCiceroNapervilleElmhurstArlington HeightsSchaumburgSkokieLa GrangeWilmette

Get Your Permit Status Confirmed Before the Project Starts

Planning chimney liner installation, fireplace construction, or chimney removal? ChimTech confirms which code applies at your address, files the permit with the correct building department, schedules the inspection, and delivers your passed inspection record at close-out. Email office@chimtech.org with your address, the work you are considering, and a brief description of your current system — you will get a clear answer, not a form letter.