Concrete Repair in Chicago, IL
Chicago Concrete Repair: Steps, Sidewalks, Balconies, Lintels and Facade Concrete
What concrete repair means in Chicago depends less on the concrete than on the building it sits on. On the Near North Side, which holds River North, Streeterville, the Gold Coast and the Magnificent Mile, 89.4 percent of housing units sit in buildings of 20 or more and the median unit dates to 1989, so most of the concrete is balcony slabs, garage decks, canopy soffits and vaulted walks. In the Loop those figures are 96.2 percent and 2002. In Lincoln Park both jobs run at once: 34.0 percent of units predate 1940 and 42.8 percent sit in buildings of 20 or more. Citywide the median unit dates to 1953 (CMAP Community Data Snapshots, 2020 to 2024 American Community Survey).
North Shore Masonry is a Chicago masonry and concrete firm, in the trade since 1978. ACI 546R-14, the Guide to Concrete Repair, says an assessment should determine the cause of deterioration and not focus only on the symptoms, and that depending on the cause and extent of the damage, repair is not always warranted. We work in that order, and where the condition belongs with a licensed design professional, we say so before quoting.
Three sets of rules decide what concrete repair and restoration on a given slab involves, and which concrete contractor in Chicago may carry it out: your own property, common elements in a multi-unit building, and the public way, which usually includes the walk in front of you and anything vaulted under it. The section below takes them in that order. Call (847) 864-5990 for a free on-site estimate.
How Concrete Repair Is Done in Chicago, and the ACI Practice Behind Each Step
The published practice behind each step, and the Chicago rule on top of it, so you can hold any bidder to the same numbers, us included.
ACI 364.1R-19 splits a full assessment into document review, condition survey, material testing and structural evaluation, two of which belong to the licensed design professional, not a repair crew. Our crews do the survey end: sounding for delamination per ASTM D4580, and chloride testing where contamination is suspected, against the FHWA working figure of more than 0.71 kg per cubic meter, 1.2 lb per cubic yard, of chloride ion. On a building more than 80 feet in building height the review starts from the report required under Municipal Code 14A-6-603.2.
Four checks on a failed patch: a perimeter saw cut 1/2 inch deep and no deeper than the cover over the reinforcement, with edges perpendicular to the surface so the repair is never feather-edged, a square cavity with no reentrant corners, concrete removed all round a corroded bar with about 3/4 inch clearance, and no jackhammer over 30 lb, which damages the bar and its bond (ACI RAP-6 and RAP-7).
The prepared face is roughened to an amplitude of 1/8 to 1/4 inch (ACI RAP-6, referencing ICRI Technical Guideline 310.1R), abrasive blasting preferred and at least 5000 psi water to remove the microcracking chipping hammers leave. Dust generating work must also meet city, state and federal dust control practices and may need a Chicago Department of Public Health air quality permit.
ACI RAP-8 is blunt that patching only the spalled areas of chloride contaminated concrete can make things worse: corrosion activity rises in a ring just outside an electrochemically incompatible patch. The fix is an embedded galvanic zinc anode at the perimeter tied to the steel inside the patch. It matters most on a Chicago Category III building, whose walls are reinforced with or touch corrodible metal.
On a concrete step repair, ACI RAP-7 specifies a water to cementitious ratio of not more than 0.40, compressive strength not less than 4000 psi, and curing under wet burlap and polyethylene for at least 7 days on concrete brought to saturated surface dry. A salted Chicago walk sits in ACI exposure class F3, the most severe, the class for pavements receiving deicing chemicals (FHWA-HIF-17-009, after ACI 201.2R-16). In the public way the specification is CDOT’s: IDOT Standard Specifications Sections 423 and 424, protected until it reaches 3,500 psi at 14 days.
NRMCA advises keeping deicing chemicals off new concrete through its first winter and states outright that repair material will not match the color and characteristics of the original concrete. We match as closely as the available material allows and show you a trial area first, and on a designated Chicago Landmark the Historic Preservation Division reviews the permit.
What Actually Destroys Concrete in Chicago, and What Concrete Repair Has to Undo
Freeze-thaw and salt is the usual explanation. Here is what the published research actually says.
The mechanism
Salt scaling is not the salt attacking the concrete. It is the ice.
O’Hare averages 74 days a winter that cross freezing, range 47 to 91 across the winters 2015-16 to 2024-25, from NOAA daily summaries for station USW00094846. Valenza and Scherer (Journal of the American Ceramic Society, 2006) showed the ice sheet shrinks faster than the concrete and cracks in tension, tearing flakes of binder off the surface: no scaling in pure water, worst damage at about 3 percent salt, none above 6 percent. Three percent is what a dosed Chicago step passes through as it thaws.
Calcium hydroxide in hardened paste reacts with calcium chloride or magnesium chloride to form calcium oxychloride, an expansive phase that forms between 32 F and 122 F, so brine damages concrete with no freeze at all (FHWA-HIF-17-008). Chicago Streets and Sanitation treats a route system of more than 9,400 lane miles, and cars track that brine onto concrete nobody ever salted.
That figure is FHWA-RD-00-081, and on pre-war stock the chloride was often in the mix from day one, because calcium chloride was a common set accelerator (NPS Preservation Brief 15), which is why an unsalted two-flat in Lincoln Park, where 12,752 units predate 1940, spalls.
Entrained air only became normal in the second half of the twentieth century (NPS Preservation Brief 15), so Bridgeport’s 1939 median unit has no built in defense against cyclic freezing where the Loop’s 2002 median does (both medians from CMAP Community Data Snapshots, 2020 to 2024 American Community Survey), and past about 86 percent saturation damage happens in one cycle whatever the air content (FHWA-HIF-17-009).
Section 14B-18-1809.5 of the Chicago Building Code extends foundations at least 42 inches below final grade for frost protection, and 14B-18-1809.4 sets a minimum footing depth and width of 12 inches.
NRMCA Concrete in Practice CIP 2 grades it by depth. Light scaling does not expose the coarse aggregate. Moderate scaling exposes it and takes 1/8 to 3/8 inch of surface mortar with it. In severe scaling the aggregate stands out. All six causes NRMCA lists are about specification, placement, finishing, curing or treatment, not how cold the winter was.
When Concrete Repair Is Enough, and When Chicago's Code Calls the Condition Unsafe
Chicago does not leave this to opinion. The code names the conditions that stop being cosmetic, says who signs off, and puts three maintenance duties on the owner.
Section 14X-3-305.1.1 item 2 makes concrete unsafe where deterioration, fractures, fissures, spalling, exposed reinforcement or failing connections put the component beyond its limit state, and the way out is a condition report signed and sealed by a registered design professional (14X-1-104.1), licensed in Illinois as an architect or structural engineer.
Foundation walls plumb and free from open cracks and breaks (14X-3-303.5). Exterior stairways, decks, porches and balconies structurally sound and properly anchored (14X-3-303.11). Sidewalks, walkways, exterior stairs and driveways free from unsafe conditions (14X-3-302.4).
Brick Industry Association Technical Note 46 lists cracks exceeding 0.075 inch, cracks through multiple units, stepped or diagonal patterns, widespread spalling, accumulated rust on lintels or shelf angles and out of plane movement, and says these warrant an investigation performed by “a professional engineer”. ACI RAP-7 says the same for any loss of cross section in a corroded bar. We do not make that call.
Rust staining is often a precursor to spalling, and delamination runs parallel to the surface where it does not show (NPS Preservation Brief 15), so concrete is sounded with a hammer or chain drag per ASTM D4580 before anyone quotes a quantity.
Call 311 with the location and your concerns and the City sends a building inspector, working from the Porch and Deck Supplemental Check Sheet.
ACI 546R-14 says access should be limited below loose concrete on an overhead or vertical surface until the hazard is removed or stabilized, and Municipal Code 14A-6-603.2.3 gives a registered design professional who finds imminent harm 24 hours to notify the building official.
Call (847) 864-5990 for a free on-site estimate. Where the condition belongs with a licensed structural engineer, we say so before we quote.
Where Concrete Repair Stops Being Yours: Private Property, Common Elements and the Public Way
Steps, stoops, patios, private walkways, driveways, foundation walls and areaway floors. The City’s permit exemption for a private concrete or brick sidewalk, patio or walkway carries three conditions, not one: not in or on the public way, not more than 30 inches above adjacent grade, and not over any basement or story below. That third condition rules out many walks in Lincoln Park, Old Town and the Loop, where flatwork sits over vaults. Permit needs depend on scope, and we confirm them before work starts.
Balcony slabs, garage decks, podium terraces, canopy soffits, shared entry stairs and facade concrete. Your building’s declaration decides which of these is a common element, and where it does, the Illinois Condominium Property Act, 765 ILCS 605/18.4(a), puts care, maintenance and replacement on the board of managers. An Express Permit Program masonry application on condominium property needs an association approval letter and an existing condition photograph. For cost guidance see our pricing page.
The walk in front of your building is usually in the public way rather than on your land. Where it is, CDOT requires a public way work license before anyone opens or repairs pavement there, carrying general liability cover of at least $1,000,000 per occurrence naming the City of Chicago as an additional insured. The line is not always your property line: CDOT’s Shared Cost Sidewalk Program excludes private property sidewalk except where a transition requires it.
Where the walk is built over a vault or areaway, replacing it is not ordinary flatwork. Section 6A.4 of CDOT’s public way regulations calls for a special permit application, describing the structural members and any special surface treatment or aggregate composition, and the Shared Cost Sidewalk Program excludes vaulted and custom sidewalks outright. On a driveway apron, a CDOT driveway permit comes first.
How to Check Any Concrete Contractor in Chicago, Including Us
Before you hire a concrete contractor in Chicago, check the license class against the work. The City’s mason contractor licensing page describes three classes: Class A covers all mason work, Class B covers all mason work except site formed concrete, and Class C covers site formed concrete only. On those descriptions site formed concrete falls outside Class B and brickwork falls outside Class C, so on a job that is part concrete and part brick the class tells you which half a bidder’s license covers. The same page lists seven exceptions where no mason contractor license is called for at all, including brick or concrete sidewalks, concrete paving and, in the City’s words, repairs of a type that do not call for a building permit. What needs a permit depends on the scope.
It also states that the license authorizes work by the licensed business and its employees under its supervising mason, not people it pays as independent contractors, and that any other business on your site must hold its own license and be listed on the permit. Check any bidder, including us, on the City’s mason contractor register.
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"Committed to preserving and promoting the masonry industry by providing continuing education, advocating fair codes and standards, fostering a safe work environment." - MCAA
Chicago Neighborhoods and Suburbs We Cover for Concrete Repair
Our own address is on the north side, at 2111 N Kenmore Avenue in Lincoln Park, and the blocks our concrete crews are on most are the Near North Side, the Loop and West Loop, Lincoln Park, Old Town and Lake View, where pre-war entry steps and areaway floors sit beside post-war balcony slabs on the next building. Brick, tuckpointing and waterproofing sit on the Chicago masonry contractor page.
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Concrete Repair in Chicago: Common Questions
Does a concrete patch on my Chicago building need a permit?
Permit needs depend on the scope, and we check with the Department of Buildings before work starts. The City’s exemption carries three conditions, not one: the concrete or brick sidewalk, patio or walkway must not be in or on the public way, not more than 30 inches above adjacent grade, and not over any basement or story below. Municipal Code 14A-4-402.3 waives the permit, not the code, and 14A-4-402.2.1 calls for a permit for work affecting the exterior of a Chicago Landmark. See Chicago permit exemptions for masonry and concrete.
Why does sidewalk patching in Chicago mean replacing the whole slab?
Because CDOT does not allow a partial patch. Under Sections 6A.1 and 6A.2 of the public way regulations, when any portion of a sidewalk slab has to come out the entire slab is removed and replaced, and on a driveway the concrete goes to the nearest construction joint. That is why a public way quote covers more square footage than the damage you see.
Who pays to repair the sidewalk in front of my Chicago building?
It depends where the walk sits and what is under it. In the public way, CDOT requires a public way work license before anyone opens or repairs pavement, and replacing a vaulted walk needs a CDOT special permit under Section 6A.4. The City’s voluntary Shared Cost Sidewalk Program, applied for through 311 in a one day annual opening, excludes vaulted and custom sidewalks and water meter vaults. If your building uses the space under the walk, Municipal Code 10-28-540 puts the duty to keep it in good and safe condition and repair on the person using that space.
Who does concrete facade repair in Chicago, and when does the facade ordinance apply?
Concrete facade repair on a tall building is a two party job. Municipal Code 14A-6-603.2 requires the owner of a building more than 80 feet in building height to obtain written condition assessment reports on the exterior envelope, and names balconies expressly alongside roofs, exterior walls, fire escapes, chimneys and canopies. Those assessments are performed by or under the direct supervision of an Illinois licensed architect or structural engineer. The professional writes the scope and we do the concrete work: facade repair, restoration, lintel repair and balcony repair.
My condo balcony is spalling. Who pays for balcony repair, and what happens first?
Start with the declaration, because that decides whether the slab is a common element or a limited common element. Where it is a common element, the Illinois Condominium Property Act, 765 ILCS 605/18.4(a), puts upkeep, maintenance and replacement on the board of managers. If the building is more than 80 feet in building height the facade ordinance also applies, and its exterior envelope expressly includes balconies, so balcony repair follows a professional’s report rather than preceding it. The permit needs an association approval letter and a condition photograph.
Is my spalling cosmetic or structural?
Chicago answers this directly. Section 14X-3-305.1.1 item 2 makes concrete unsafe where deterioration, fractures, fissures, spalling, exposed reinforcement or failing connections put the component beyond its limit state, and the way out is a condition report signed and sealed by a registered design professional and accepted by the building official (14X-1-104.1). We do not make that call: we sound the concrete and work from the engineer’s report.
What does concrete restoration in Chicago involve, and how is it different from concrete repair?
Repair puts back what has failed. Restoration takes the whole element or elevation back to a serviceable condition, which on Chicago’s older stock means entry steps, cheek walls, areaway floors, vaulted walks, lintels and facade concrete surveyed together rather than one spall at a time. ACI 546R-14 puts the cause of deterioration ahead of the symptoms, which is why a restoration scope starts by sounding a whole face.
Chicago Rules, Permits and Programs, With the Links
These are the City pages the answers above come from.
The three conditions on private flatwork, the 50 square foot in kind limit, the landmark caveat, and the rule that an exemption waives the permit, not the code.
Concrete repair up to 100 square feet qualifies; 100 to 5,000 square feet needs drawings by an Illinois licensed architect or structural engineer.
The live register of active mason contractors. Run every bidder through it, us included, and check the class against the work.
The public way work license, the whole slab rule (6A.1 and 6A.2), the 3,500 psi at 14 days protection requirement (6A.5), and the special permit application needed to replace a vaulted sidewalk, describing the structural members and any special surface treatment or aggregate composition (6A.4).
The voluntary program for public walks, applied for through 311 during a one day annual opening. Read the exclusions first: vaulted and custom sidewalks, water meter vaults and stairs in the right of way are all out.
For buildings more than 80 feet in building height, where Municipal Code 14A-6-603.2 names balconies as part of the exterior envelope. Short forms are due by 1 November and critical examination reports by 1 December; the 2026 short form is Form EW-1, due on or before 1 November 2026.