Do I Need a Permit to Replace Windows in Chicago, IL?
Chicago window replacement permits offer meaningful homeowner relief at the low end — in-kind replacements in existing openings on residential buildings up to 4 stories above grade require no building permit at all — while the Express Permit Program provides a fast online path for window replacements in buildings up to 7 stories, with Chicago's most distinctive local requirement being the window opening control device: any replacement window in a residential building with a sill less than 36 inches above the floor must include a device that limits the opening to less than 4 inches until a child-safety need is overridden.
Chicago window replacement permit rules — the basics
Chicago's building code creates three distinct tiers for window replacement work. The first and most homeowner-friendly tier is the permit exemption for in-kind window replacement: repairing or replacing an exterior window or skylight in the same existing opening on a residential building up to 4 stories above grade, where the replacement is the same type, size, and shape as the existing window, does not require a building permit. Chicago's code defines "in-kind replacement" as using new materials of the same type, size, and shape as what is being replaced — so a standard double-hung window in the same dimensions replacing an aging double-hung qualifies. The exemption covers both the window unit itself and a storm window installation or removal, as well as insect screen installation. Replacing an existing ground-level window including the frame without cutting into any exterior wall is also permit-exempt on any building.
The second tier is the Express Permit Program (EPP) for exterior window replacement in existing openings. The EPP covers installation of replacement windows and skylights in existing exterior wall and roof openings on buildings generally up to 7 stories above grade — a broader coverage than the permit-exempt tier's 4-story limit. The EPP also covers installing new storm windows over existing windows, and replacing windows with different dimensions than the existing unit (provided the opening itself is not enlarged). The EPP is applied for online at ipi.cityofchicago.org and is typically issued within one to two business days. For buildings over 7 stories, or for window replacements in fire-rated openings, an Illinois-licensed architect or structural engineer must prepare the drawings submitted with the application. The EPP expressly excludes window replacements that create new openings in the exterior wall — that scope requires Standard Plan Review.
The third tier is Standard Plan Review for any work that creates new window openings, enlarges existing openings through structural wall modification, or involves fire-rated window assemblies in complex multi-story buildings. Creating a new window in a wall that has no existing window requires an architect-prepared permit package because the new opening must be sized and framed to carry the structural loads from the removed wall framing, and the opening must comply with light, ventilation, and egress requirements for the space served.
Chicago's Energy Transformation Code (the local adoption of the International Energy Conservation Code with Chicago-specific amendments) requires all replacement windows installed under any permit to meet minimum energy performance standards. The code specifies maximum U-factor values (measuring the window's insulating effectiveness) and maximum Solar Heat Gain Coefficient (SHGC) values (measuring how much solar heat the window transmits) for residential and commercial replacement windows. These requirements apply to all Chicago replacement windows in permitted projects; non-compliant windows cannot be approved by the DOB inspector at final inspection. Most modern double-pane Low-E windows readily meet Chicago's energy code requirements, but single-pane windows and non-Low-E double-pane units commonly fail the U-factor threshold.
Why the same window replacement in three Chicago buildings gets three different outcomes
| Variable | How it affects your Chicago window replacement permit |
|---|---|
| 4-story threshold for permit exemption | In-kind window replacement in existing openings on residential buildings up to 4 stories above grade: no building permit required. The same in-kind replacement on a 5-story or taller building requires an Express Permit Program application. "In-kind" means the same type, size, and shape — a double-hung for a double-hung of identical dimensions, for example. Changing window style (double-hung to casement), size, or location requires at minimum an EPP permit regardless of building height. |
| Chicago Energy Transformation Code requirements | All replacement windows installed under any Chicago building permit must meet the U-factor and SHGC (Solar Heat Gain Coefficient) requirements of the Chicago Energy Transformation Code. Even permit-exempt replacements must comply with these standards, though they are not verified by an inspector. Most modern double-pane Low-E windows sold in the Midwest meet Chicago's requirements; confirm the U-factor and SHGC on the product specification sheet before ordering. Single-pane windows and non-Low-E double-pane windows typically do not comply. |
| Window opening control devices (child safety) | Chicago Building Code Section 14R-7-702.4 requires that any replacement window in a residential building with an openable sash located within 42 inches above the floor, where the windowsill is less than 36 inches above the floor, must include a window opening control device (WOCD) that limits the opening to less than 4 inches. This requirement protects children from falls through low windows. WOCDs are standard on most Chicago-market residential windows; confirm with the manufacturer that the selected window includes a compliant WOCD for all applicable locations. |
| Insect screens required | Any openable replacement window installed at 50 feet or less above the ground must include either permanent insect screens or removable insect screens under Chicago Building Code requirements. This applies to EPP-permitted window replacements. Screens must be provided at the time of the permit inspection. Standard residential screen kits from window manufacturers satisfy this requirement. |
| Safety glazing in hazardous locations | Chicago Building Code Chapter 24 requires safety glazing (tempered or laminated glass) in specific "hazardous locations" including: glazing within 18 inches of a door's strike edge in a hazardous pattern; glazing within 18 inches of the floor in doors; glazing in tub and shower enclosures; glazing at stairways and landings less than 36 inches above the floor. Any replacement window in these hazardous locations must use safety glazing regardless of what the original window used. Inspectors verify safety glazing compliance at the final inspection. |
| Condo association approval letter | Any permitted window replacement in a condominium unit or on a condominium building requires a condo association approval letter before the EPP or Standard Plan Review permit will be issued. The letter must be signed by an authorized association representative and describe the work. For whole-building window replacement projects managed by the association (not individual units), the association files the permit as the permit applicant and the letter requirement is internal to the association's authorization process. |
Chicago's window opening control device requirement — a uniquely Chicago safety code
Chicago Building Code Section 14R-7-702.4 requires that replacement windows in residential buildings include opening control devices (WOCDs) when the window's sill is less than 36 inches above the finished floor and the window's openable sash is within 42 inches above the floor. The WOCD limits the window's opening to less than 4 inches to prevent children from falling through partially or fully opened windows. This requirement specifically targets the window configuration common in Chicago's residential building stock: double-hung windows where the lower sash opens to a low sill height in street-level or second-floor units where children might access the window opening.
WOCDs are standard equipment on most residential windows sold in Illinois and the Midwest — reputable window manufacturers include them as a standard feature or as an easy add-on. The WOCD typically consists of a hardware-mounted restrictor on the window frame that physically prevents the sash from opening beyond 4 inches, with a release mechanism that allows adults to override the restriction for emergency egress or cleaning. Under Chicago's code, the WOCD must be included even on replacement windows replacing older windows that did not have WOCDs, bringing the installation into current code compliance. The inspector verifies WOCD installation at the final inspection for EPP-permitted window replacements.
The 4-inch opening limit is consistent with life safety codes throughout the country that recognize 4 inches as the maximum opening through which a young child's head cannot pass. The fall-prevention rationale is supported by injury data showing window falls as a significant cause of childhood injuries and deaths, particularly in multi-story urban buildings where fall distance is greater. Chicago's code addresses this risk through the WOCD requirement on all replacement windows at applicable heights rather than only on new windows — making every permitted window replacement an opportunity to bring the building's windows into current child safety compliance.
What the inspector checks on a Chicago window replacement
For EPP-permitted window replacements, one final inspection is required after all windows covered by the permit are installed. The inspector verifies that the windows are installed in the existing opening locations described in the permit application; that the installed units' specifications (U-factor, SHGC) match the energy performance requirements of the Chicago Energy Transformation Code (the contractor should have product specification sheets available on site); that window opening control devices are installed at all applicable locations (sill less than 36 inches above the floor, openable sash within 42 inches of the floor); that insect screens are installed on all openable windows at or below 50 feet above grade; and that safety glazing is in place at all hazardous locations required by Chapter 24.
For new window openings permitted through Standard Plan Review, a framing inspection occurs before any drywall or interior finish is installed around the new opening, verifying that the header is installed per the approved structural drawings. The final inspection confirms the window installation and all the same compliance items checked in EPP inspections. For fire-rated window assemblies in multi-story buildings near lot lines, the inspector verifies the fire rating documentation of the installed window unit.
What window replacement costs in Chicago
Window replacement costs in Chicago reflect the premium labor market and the additional considerations of working in the city's dense urban environment (limited truck access, parking coordination, waste disposal). Standard vinyl double-pane Low-E replacement windows for in-kind installation: $250–$500 per window installed for standard residential sizes. Fiberglass or aluminum-clad wood windows: $450–$800 per window. Larger architectural windows or specialty shapes: $800–$2,500 each. A whole-house replacement of 14–20 standard-size windows in a Chicago bungalow or two-flat: $8,000–$18,000 for standard vinyl. A condo building whole-building replacement project costs vary widely by the number of units and window configurations.
Permit fees for EPP window replacements are modest — $75–$200 for standard residential projects. Standard Plan Review for new openings: $150–$400. Structural engineering for a new opening header: $500–$1,500. The permit-exempt path (in-kind on ≤4-story residential) has no permit fee. Senior homeowners (65+) who meet income eligibility criteria may qualify for permit fee waivers for window replacement work in 1-to-3 unit residential buildings they reside in.
What happens if you skip the permit
For in-kind replacements on residential buildings up to 4 stories above grade that genuinely qualify for the permit exemption, there is no permit to skip — these are legitimately permit-exempt. The issue arises when a contractor characterizes a non-exempt project as exempt to avoid the permit process. Window replacements on buildings over 4 stories performed without EPP permits leave the installation uninspected for energy code compliance, window opening control device installation, and insect screen compliance. At resale, permit records are public and a recent whole-building window replacement with no corresponding permit may trigger questions. For condo buildings where the association is subject to reserve fund audits and lender requirements, unpermitted window work can create complications with lender due diligence on the association's compliance history.
Phone: (312) 744-3449 · Mon–Fri 8:00am–4:30pm
chicago.gov/buildings → · Online permits: ipi.cityofchicago.org →
Common questions about Chicago window replacement permits
Do I need a permit to replace windows in my Chicago home?
It depends on your building height and the scope of replacement. In-kind replacement of exterior windows in existing openings on residential buildings up to 4 stories above grade requires no building permit. For residential buildings 5 to 7 stories, an Express Permit Program permit is required for in-kind replacements in existing openings. For buildings over 7 stories, or where windows have changed sizes, a more detailed permit process is required. All replacement windows must meet Chicago Energy Transformation Code performance requirements regardless of permit status.
What is the window opening control device requirement in Chicago?
Chicago Building Code Section 14R-7-702.4 requires that any replacement window in a residential building with a sill less than 36 inches above the finished floor, where the openable sash is within 42 inches above the floor, must include a window opening control device (WOCD) limiting the opening to less than 4 inches. This child-fall-prevention requirement applies even when replacing windows that did not previously have WOCDs. Most modern residential windows sold in Illinois include WOCDs as a standard feature. The inspector verifies WOCD installation at the final inspection for permitted window replacements.
What U-factor and SHGC are required for Chicago replacement windows?
The Chicago Energy Transformation Code specifies maximum U-factor and SHGC values for replacement windows. Specific requirements depend on the climate zone and building type; Chicago is in Climate Zone 5A. For most residential replacement windows, the code requires a maximum U-factor of approximately 0.30 and SHGC limits that depend on orientation. Most modern double-pane Low-E windows sold in the Midwest meet these requirements. Confirm the product's NFRC-labeled U-factor and SHGC values against current code requirements before ordering. The DOB inspector verifies compliance at the final inspection.
Do condo windows need association approval in Chicago?
Yes. Any permitted window replacement in a condominium unit or on a condominium building requires a written condo association approval letter before the DOB will process the permit application. The letter must be signed by an authorized association representative (property manager or association officer) and briefly describe the work to be performed. For whole-building window replacement projects initiated by the association itself, the association typically serves as the permit applicant and the internal authorization documentation serves as the required letter. Get association approval before finalizing installation timelines.
Can I replace my windows with a larger size in Chicago?
Yes, but enlarging the rough opening requires a permit regardless of building height. The Express Permit Program only covers replacements within existing openings — it does not authorize structural modification of the wall to create a larger opening. Adding a new window where none existed, or enlarging an existing opening by cutting into the surrounding wall framing, requires Standard Plan Review with a structural engineer's design for the enlarged header and drawings prepared by an Illinois-licensed professional. Budget for engineering fees of $500–$1,500 per opening and three to five weeks of plan review time.
How long does a Chicago window permit take?
For in-kind replacements on ≤4-story residential buildings: no permit required, no processing time. For Express Permit Program applications: typically approved within one to two business days. For Standard Plan Review (new openings, larger openings): three to five weeks for initial plan review. Inspections for EPP permits: one final inspection schedulable within three to seven business days after installation. Total timeline for an EPP whole-house window replacement: one to three weeks from permit application to final inspection, with installation itself taking one to three days.
This page provides general guidance based on publicly available municipal sources as of April 2026. Chicago Energy Transformation Code requirements are periodically updated; verify current U-factor and SHGC requirements with the Chicago Department of Buildings before ordering replacement windows for a permitted project. For a personalized report based on your exact address and project details, use our permit research tool.