Chimney repair in Chicago comes down to one decision: fix what is failing, or take the failing part down and rebuild it. Most brick chimneys are repair candidates. They have open joints, a cracked crown, or a few bricks at the top that have let go. Others are leaning, spalled through, or pulling away from the building, and those get rebuilt. This article gives you the signs for each, the permit and license picture, and the questions to ask before anyone sets up scaffolding on your roof.
What usually goes wrong with a brick chimney?
A chimney is the most exposed piece of masonry on the building. It is surrounded by weather on all four sides and sits above the roof where nobody looks at it. Water is the common thread. The Brick Industry Association says flashing belongs where a chimney meets the roof, and that caps and copings exist to channel water away from the structure, with brick caps full of mortar joints a weak choice at an exposed location (BIA, BIA).
When water gets in, brick that stays saturated can spall or delaminate from freeze-thaw cycling, or from salts crystallizing inside the brick (NPS and BIA). So the pattern is predictable: open joints and a leaking top let water in, the upper courses go first, and the damage works its way down.
Can your chimney be repaired, or does it need a rebuild?
This is the real question. A rule of thumb that holds up: repair when the structure is sound, rebuild when it is not.
| What you see | Usually points to |
|---|---|
| Open or sandy mortar joints, bricks still solid | Repair (repointing) |
| Cracked or crumbling cap at the top, wall below is sound | Repair (cap or crown) |
| A few spalled or loose bricks near the top | Repair (replace those bricks) |
| Deep spalling across many courses | Rebuild the affected section |
| Chimney leaning, bowed or separating from the house | Rebuild, and treat it as urgent |
| Bricks shifting or missing at the roof line | Rebuild that section |
These are general patterns. A mason has to look at it, and a chimney that looks fine from the ground can be worse above the roof. If yours is leaning or you see pieces on the roof or yard, read leaning chimney: is it about to fall first.
What does a chimney repair include?
Repointing. If the joints are open but the bricks are sound, repointing is the repair. The mortar has to be right: softer and more vapor-permeable than the brick, and no harder than the original (National Park Service). Old mortar should be taken out to about two to two and a half times the joint width (National Park Service). Our chimney tuckpointing article covers when that alone is enough.
Crown or cap repair. The top of the chimney is what keeps water out of the stack. If the cap is cracked or missing, repointing the shaft alone treats the symptom. See chimney crown repair for what to look for.
Replacing bricks. Individual spalled or loose bricks can be cut out and replaced with matching brick, usually after the water source is fixed.
Partial rebuild. Taking the top courses (or the part above the roof) down to sound brick and laying it back up. It is the middle path between a repair and a full rebuild.
Full rebuild. Taking the stack down and building it again. Ask your mason to show you exactly why a full rebuild is needed before you agree to one.
If you no longer use the chimney at all, removal is a separate topic: see can you remove a chimney in Chicago.
Do you need a permit for chimney repair in Chicago?
The City does not give chimneys their own line in the masonry rules we reviewed, so treat this as a call to the Department of Buildings, with these pieces as guidance.
- Small repairs. The City exempts in-kind replacement of up to 50 square feet of masonry on residential buildings up to four stories (City of Chicago). A few replaced bricks on a chimney can fit that. The general repair exemption still excludes work that cuts away part of an exterior wall or removes a load-bearing support (City of Chicago).
- Repointing and routine masonry repair. The Express Permit masonry category lists routine maintenance and repair of masonry walls, such as tuckpointing, as eligible work (City of Chicago).
- Big rebuilds. Express does not cover rebuilding all layers of an exterior wall or building new masonry structures (City of Chicago). A chimney rebuild is not named in either list, so ask the Department of Buildings whether yours uses Express or another review. Do not guess.
- Emergencies. If a chimney is an immediate hazard, emergency work can go first, with the permit application due the next business day and emergency scaffolding applied for within 3 business days (City of Chicago).
Scaffolding or a dumpster on the sidewalk, alley or parkway needs a separate permit from CDOT (City of Chicago). On a lot-line building, expect to need it.
Who is allowed to do the work?
Masonry permits require a City-licensed mason contractor, unless an owner qualifies as owner-contractor (City of Chicago). The mason license covers work in stone, concrete and clay brick, and the business must have at least one person who passed the City's mason exam (mason contractor license). Repairs that do not need a permit, and owner-occupied residences of three stories or fewer and six units or fewer (one property per year), are among the license exceptions (City of Chicago).
Your relationship with the contractor is also covered by Illinois law. The Home Repair and Remodeling Act applies to residences of one to six units and lists chimneys among its examples (State of Illinois). For work over $1,000 the contractor must give you a written contract or work order stating the total cost (State of Illinois). If you do not get one, ask for it before work starts.
Our work is the brick. Whether the flue is lined, whether it is safe for the heating appliance connected to it, and whether carbon monoxide can get into the house are separate questions. A masonry repair does not answer them. Ask your heating contractor or a chimney professional to inspect the flue.
Why does the City care about a chimney?
Because a chimney that sheds brick is a falling hazard, and the owner is responsible for the exterior. Chicago's code requires the exterior of a structure to be in good repair and structurally sound, and lists masonry joints that are not weather resistant or water tight, and facings that are not properly anchored, as unsafe conditions (City of Chicago). A chimney can be cited after a neighbor or passerby calls 311.
On older two-flats and three-flats, the chimney is often the last thing anyone has touched. The top courses lose their mortar first, then water gets in around the flashing or through a cracked cap, and the stack spalls from the top down. Owners usually discover it after a brick lands in the yard, or an inspector, insurer or home buyer's inspector flags it.
What should you ask a mason about chimney repair?
- Is this repair, partial rebuild or full rebuild, and why?
- How far down does the damage go? Can you show me?
- What happens to the cap, flashing and mortar?
- Who pulls the permit and who gets the sidewalk or alley permit for the scaffolding?
- Is the contract in writing, with the total cost and scope?
For the whole brick picture, see our Chicago brick and masonry repair guide. If you want a mason to go up and tell you straight whether your chimney is a repair or a rebuild, our masonry crew will take a look and write it up.
Common questions
Open joints, a cracked cap or a few loose bricks near the top usually mean repair. A leaning or bowed chimney, deep spalling across many courses, or bricks shifting at the roof line point toward a rebuild. A mason has to inspect it above the roof.
Small in-kind brick replacement up to 50 square feet on a residential building up to four stories is exempt, and tuckpointing is listed under Express masonry. A chimney rebuild is not named, so ask the Department of Buildings which route applies.
Masonry permits require a City-licensed mason contractor unless you qualify as owner-contractor on your primary residence. Ask who holds the mason license, and get the scope and total cost in a written contract.
No. Brick repair addresses the stack's masonry. Whether the flue is lined and safe for the connected appliance is a separate inspection by a heating or chimney professional.
It can be. Leaning, bowing or separating from the house, or bricks coming off, are reasons to keep people away from the area and call a mason right away. Emergency work can go ahead before the permit if the application follows the next business day.
Sources
- City of Chicago: Guide to Building Permits: What Types of Work Do Not Require a Building Permit?
- City of Chicago: Express Permit Program: Masonry Work
- City of Chicago, Department of Buildings: Mason Contractor License
- City of Chicago: Guide to Building Permits: Mason Contractor License FAQ
- Illinois General Assembly: Home Repair and Remodeling Act, 815 ILCS 513/15
- Illinois General Assembly: Home Repair and Remodeling Act, 815 ILCS 513/10
- City of Chicago: Code Modernization Ordinance, including Title 14X Minimum Requirements for Existing Buildings (PDF)
- Brick Industry Association: Technical Note 7: Water Penetration Resistance, Design and Detailing (PDF)
- Brick Industry Association: Technical Note 36A: Caps and Copings, Corbels and Racking (PDF)
- National Park Service: Preservation Brief 2: Repointing Mortar Joints in Historic Masonry Buildings (PDF)
Facts last checked: October 7, 2026.
This article explains general rules and common situations in Chicago. It is not legal advice, and City rules change. For a specific property, check with the Chicago Department of Buildings or a licensed professional.