Preview Preview: 11,176 permits loaded from Chicago, Austin and Seattle. More cities are being added. Sourced from city open-data portals. Data as of 2026-09-16.

420 W ONTARIO ST

Chicago, IL

1 permit on record, mostly addition work — general/building.

Permits on record1
Declared value
Contractors1
Most recent2026-08-18

Work here was permitted by BUFF CONSTRUCTION, INC..

  1. 2026-08-18

    Porch,Deck,Balcony,or Fire Escape — PERMIT – EXPRESS PERMIT PROGRAM

    REPAIR (26% TO 50%) FOR STEEL EXTERIOR BALCONY (QUANTITY: 1, LOCATION: SOUTH SIDE OF BUILDING).

    Declared value Contractor BUFF CONSTRUCTION, INC.Status ACTIVEPermit B200474373

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Permit records published by the City of Chicago. Each entry links to the city's own record where the city provides one.