Monthly archive · Cook County, Illinois
Chicago Building Permits — September 2026
Every building permit issued by the City of Chicago in September 2026: counts, reported value, permits by trade, and the month's biggest projects.
Source: City of Chicago open data — building permits. Source last updated: October 17, 2026 · Our last pull: October 17, 2026 · Figures are as reported by the City of Chicago.
Coverage: this report covers building permits issued by the City of Chicago, the largest jurisdiction in Cook County. Suburban Cook County permits are published by separate municipalities and are not in this feed yet, so county totals here are Chicago totals — labeled as such, never blended.
PermitsByCounty data, Cook County (Chicago), September 2026 · Source: City of Chicago
Questions, answered from the data
What was the largest building permit issued in Chicago in September 2026?
The largest was permit #101084518 at 400 S La Salle St, with a reported project value of $151,112,046, issued in September 2026, as reported by the City of Chicago.
Permits by trade — September 2026
| Trade | Permits issued | Reported value |
|---|---|---|
| Electrical | 744 | $32,479,062 |
| General & Other | 741 | $341,842,188 |
| Plumbing | 271 | $48,652,240 |
| Masonry | 238 | $25,686,828 |
| Solar | 237 | $5,194,591 |
| Signage | 204 | $776,514 |
| Roofing | 161 | $26,377,019 |
| New Construction | 157 | $156,149,374 |
| Elevator | 97 | $8,304,682 |
| Fencing | 90 | $674,460 |
| Fire Alarm | 86 | $0 |
| HVAC | 84 | $35,171,596 |
| Demolition | 69 | $2,952,940 |
Biggest projects issued in September 2026
| Project (permit #) | Trade | Reported value | Issued |
|---|---|---|---|
| 400 S La Salle St #101084518 PHASE 3 OF 3: INTERIOR ALTERATIONS TO EXISTING 7-STORY OFFICE BUILDING TO CONVERT TO A DATA CENTER. WORK TO… | General & Other | $151,112,046 | 2026-09-16 |
| 136 N Kedzie Ave #101078161 DDS 2019 CBC: FULL BUILDING PERMIT FOR A 5-STORY MIXED-USE BUILDING WITH GROUND FLOOR COMMERCIAL AND OFFICE… | New Construction | $28,795,046 | 2026-09-16 |
| 4717 S Calumet Ave #101081360 SPR 2019 CBC - PBC/DFSS/2FM - #10030: PILES (VERTICAL PENETRATION) ONLY FOR NEW CONSTRUCTION OF A 2-STORY … | New Construction | $21,000,000 | 2026-09-29 |
| 4717 S Calumet Ave #101084232 SPR 2019 CBC - PBC/DFSS/2FM - #10030: FOUNDATION, GRADE BEAMS, UNDERGROUND UTILITIES, AND LANDSCAPE. FOR N… | General & Other | $21,000,000 | 2026-09-30 |
| 5215 N California Ave #101086549 SELF CERT 2019 CBC: INTERIOR ALTERATIONS TO EXISTING MERCANTILE SPACE ON THE GROUND FLOOR OF THE FOSTER MED… | General & Other | $20,690,000 | 2026-09-18 |
| 1651 E 95Th St #B200513144 REPAIR/REPLACEMENT AFFECTING 1 SYSTEMS : 3 PACKAGED TERMINAL DX SYSTEM(CARRIER 48GEEMO8A2M5-8W3C0 ROOF) .… | HVAC | $18,230,600 | 2026-09-30 |
| 5339 S State St #101071666 DDS 2019 CBC: NEW 2 STORY DANCE STUDIO BUILDING (OCCUPANCY GROUP B; CONSTRUCTION TYPE IIIA) V3 COMPANIES OF IL | New Construction | $15,600,000 | 2026-09-02 |
| 673 W Wrightwood Ave #101083639 DDS 2019 CBC: FULL BUILDING PERMIT FOR NEW CONSTRUCTION OF A 3-STORY CULTURAL EXHIBIT BUILDING WITH ROOFTOP… | New Construction | $15,000,000 | 2026-09-17 |
| 9 W Walton St #101085805 SPR 2019 CBRC: INTERIOR RENOVATION OF EXISTING LL2, AND 37TH AND 38TH FLOOR CONDO UNIT, IN EXISTING HIGH RI… | General & Other | $10,930,864 | 2026-09-02 |
| 810 E Hyde Park Blvd #101081675 DDS 2019 CBRC. RENOVATION OF THE SUNNYDALE COMMONS APARTMENTS CONSISTS OF ONE HUNDRED FOUR (104) SENIOR LIV… | General & Other | $10,600,000 | 2026-09-17 |
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