CHICAGO · FIREPLACE INSTALLATION

Fireplace Installed, Permitted, and Inspected by the Same Crew

Permit and passed inspection record delivered to the homeowner — documentation that travels with the home. We assess the structure before we specify the fireplace.

STRUCTURE DECIDES THE TYPE

What a Chicago Home Can Actually Support Determines the Fireplace Type

Adding a fireplace starts with one question: what can the structure hold?

Masonry Build

Brick, firebrick, and a poured or cast firebox — heavy, permanent, and sized to a dedicated footing that ties into the foundation.

Zero-Clearance

A factory-built unit set inside a framed chase with minimal clearance to combustible framing — a fraction of the weight, and no separate footing.

Insert

Goes into an existing opening — whether from a previous fireplace or a purpose-built surround.

Each path has different structural requirements, different flue-sizing calculations, and a different permit process depending on the municipality. The right choice isn’t the one that looks best in a product catalog — it’s the one the specific room, floor structure, and wall layout can actually support. ChimTech assesses the installation space first: room dimensions, ceiling height, floor-system load capacity, and available exterior wall or chase access. The fireplace type comes after the assessment, not before it.

3 Install Paths

Masonry · Zero-Clear · Insert

Permit Filed

Before Work Begins

Same Crew

Assessment → Inspection

4–8 Weeks

Assessment to First Fire

OLDER HOMES, REAL CONSTRAINTS

Chicago Housing Stock Sets Real Limits on Fireplace Options

Homes built before 1960 present structural constraints that most product specifications don’t account for.

The floor joists in older Chicago homes were sized for the original load — not for the weight of a full masonry build added decades later. A masonry fireplace requires a dedicated footing that ties into the foundation, and in many homes that footing doesn’t exist; adding one is a significant structural undertaking. It is a recurring reality in the dense bungalow corridors of Portage Park (60641) and Jefferson Park (60630), and on the two-flats of Avondale and Logan Square, where original floor systems were built to carry furniture loads, not masonry.

A zero-clearance fireplace solves that — it weighs a fraction of a masonry build, its framing clearances are specified by the manufacturer, and a new chase can be built against an exterior wall without touching the existing floor structure.

Zero-clearance installs have their own constraints, though. The flue sizing — the required cross-sectional area of the vent, calculated against the firebox opening — must match the manufacturer’s spec for that specific unit. An undersized vent produces draft problems; an oversized one produces condensation in the liner. The assessment exists precisely because no two spaces produce the same answer.

WHAT I EVALUATE FIRST

What Brian Dobuis Evaluates Before Making a Recommendation

Every installation assessment starts at the floor, not the wall. — Brian Dobuis, Founder, ChimTech

Brian Dobuis

Founder, ChimTech

I’m looking at the floor system first. In a main-floor living room of a pre-war Chicago home, I want to know whether the subfloor and joists can carry a hearth extension — the non-combustible surface required by code in front of every fireplace opening — plus the unit itself. For a standard opening that’s a minimum of 16 inches in front and 8 inches on each side, and on older homes that surface has to be built up from non-combustible material, which adds weight.

Then wall access: where does the chase or flue exit the building? On a main-floor install in a two-story, the flue runs through or alongside the upper-floor framing before it exits the roof, and a chase inside the exterior wall has different clearance requirements than one built outside the envelope.

Finally, ceiling height. A masonry build carries its own proportioning rules — the flue cross-section is typically one-tenth of the fireplace opening area. Get that wrong and the fireplace smokes; get the hearth wrong and the job fails inspection. ChimTech sizes and installs that liner as part of the build (the same flue work covered on our chimney liner installation page). The written assessment documents every measurement — dimensions, recommended type, and permit timeline — before any work is authorized.

STANDARD, NOT AN ADD-ON

The Permit and Inspection Record Come Standard

Every new fireplace installation requires a building permit. ChimTech files it.

The permit covers the structural work, the hearth extension, the framing clearances, and the chimney system. Which office issues it depends on the address: the City of Chicago Department of Buildings inside city limits, or your village or city building department outside it. ChimTech identifies the right jurisdiction and files there. Beyond the legal requirement, it matters for the home’s record: under the Illinois Residential Real Property Disclosure Act, an unpermitted installation can become a disclosure item when the home is sold.

ChimTech pulls the permit before construction begins, in the homeowner’s name. When the work passes city inspection, the homeowner receives a copy of both the permit and the inspection record, and that documentation stays with the property. The city inspection is scheduled as part of the project timeline — it’s the close-out step that completes the job, not an afterthought.

OUR STANDARD

ChimTech's Standards for Every Fireplace Installation

Based on what the applicable building code requires — and what each structure demands.

Hearth extension — built to code dimensions for the specific firebox opening; no undersized shortcuts.

Framing clearances — verified against manufacturer specs for zero-clearance units, against the applicable local code for masonry builds.

Flue sizing — calculated for the appliance type: the one-tenth rule for masonry, manufacturer vent spec for factory-built units.

Chase construction — framed for the full flue run from firebox to rooftop cap, with proper clearances at every floor penetration.

Permit documentation — filed before work begins; passed inspection record delivered at close-out.

Single crew — assessment, construction, and chimney work by the same ChimTech crew; no subcontracted flue or masonry portions.

THE TIMELINE

From Assessment to First Fire

A defined, documented sequence — typically four to eight weeks end to end.

Space Assessment & Authorization

An in-person assessment of the installation space: ChimTech measures the room, evaluates the floor structure, confirms exterior wall or chase routing, and calculates flue-sizing requirements. The visit produces a written recommendation — fireplace type, installation path, and estimated timeline — which the homeowner reviews and authorizes before anything is ordered.

Permit Filing & Construction

Once the permit is filed and approved by the authority having jurisdiction, construction begins. For zero-clearance: frame the chase, install the unit, build the hearth extension to code, run the flue to the rooftop. For masonry: start at the footing and move up through firebox, smoke chamber, and flue. The cap is installed at the rooftop, and the flue is confirmed clear and correctly sized before the damper is set.

Inspection & Close-Out

ChimTech schedules the municipal inspection as the final step. The inspector reviews hearth dimensions, framing clearances, and the chimney system before issuing a passing record, which goes to the homeowner. First use of the fireplace follows inspection close-out — not before.

WHERE WE INSTALL

Where ChimTech Schedules Fireplace Installations Across Chicagoland

ChimTech installs fireplaces throughout Chicago and the surrounding suburbs — every project handled by the same crew from assessment through inspection.

The work spans the metro. Homes in Portage Park (60641), Jefferson Park (60630), Avondale (60618), Logan Square (60647), Beverly (60643), Hyde Park (60615), Norwood Park (60631), Lincoln Square (60625), Oak Park, Berwyn, and Evanston are all within the service area. The older housing stock — bungalows, two-flats, and greystones — is exactly where structural assessment matters most before a fireplace type is selected.

No work is dispatched from an out-of-market hub. The crew that conducts the initial assessment is the crew that completes the installation and attends the city inspection.

Portage ParkJefferson ParkAvondaleLogan SquareBeverlyHyde ParkNorwood ParkLincoln SquareOak ParkEvanston

Call (312) 768-8940 to schedule your installation assessment.

Ready to Add a Fireplace to Your Chicago Home?

The first step is an in-person assessment — not a product selection. ChimTech evaluates your space, recommends the right installation type, and handles the building permit from filing through passed inspection, delivering a complete written record at close-out. Have your address and a brief description of the room ready. Prefer email? Reach us at office@chimtech.org.

FAQ

Frequently Asked Questions — Fireplace Installation

Can I add a fireplace to a Chicago home that has never had one?

Yes, in most cases — the installation path depends on the structure. Homes with adequate floor systems and exterior wall access are good candidates for zero-clearance installation, which doesn’t require a dedicated masonry footing. Older homes with complex framing or limited chase routing may have constraints that affect the fireplace type. ChimTech’s in-person assessment determines what each specific home can support before any product is specified.

What's the difference between a zero-clearance fireplace and a masonry fireplace?

A masonry fireplace is built on-site from brick, firebrick, and cast components, starting at a dedicated footing in the foundation — heavy and permanent. A zero-clearance fireplace is a factory-built metal unit designed to install inside a framed chase with manufacturer-specified clearances to surrounding combustible framing. Zero-clearance units are far lighter and need no separate footing, which makes them the more practical choice in most older Chicago homes that lack the original structural support for masonry.

Does ChimTech pull the building permit, or is that the homeowner's responsibility?

ChimTech files the Chicago building permit before construction begins, taken out in the homeowner’s name. When the installation passes city inspection, ChimTech delivers a copy of both the permit and the inspection record to the homeowner. That documentation stays with the property and confirms the installation is code-compliant.

How long does a fireplace installation take from first contact to first fire?

The full timeline from initial assessment to passed city inspection typically runs four to eight weeks. Variables include permit processing time through your municipal building department, the complexity of the chase routing, and the installation type — a straightforward zero-clearance install on a single-story home runs faster than a masonry build in a two-story two-flat with multi-floor flue routing.

What happens if my floor system can't support a masonry fireplace?

The assessment identifies that constraint before any work is authorized. In most cases a zero-clearance fireplace is the practical alternative — it achieves the same function at a fraction of the weight, without structural modifications to the existing floor system. ChimTech documents the assessment findings in writing so the homeowner understands exactly why the recommendation was made.

Do I need a chimney liner with a new fireplace installation?

Yes. Every new fireplace requires a correctly sized flue system from firebox to rooftop. For masonry builds that means a clay tile or cast-in-place liner sized to one-tenth of the firebox opening area; for zero-clearance units the manufacturer specifies the vent category and diameter. ChimTech sizes, installs, and documents the liner as part of every installation — it’s not a separate add-on, though the dedicated chimney liner installation service covers liner work on its own when that’s the scope.