Do I need a permit for window replacement in
Edwardsville, Illinois?

Edwardsville window replacement permits — the key details

Illinois Residential Code (adopted from the 2021 IRC) exempts window replacements when they maintain the original opening size, frame type, and egress compliance. Section R612.4 of the code states that windows in sleeping rooms and basements must have an emergency escape opening with a minimum sill height of 44 inches from the floor, a minimum net area of 5.7 square feet (or 5 square feet if the window is the sole egress from the room). When you replace a bedroom or basement window with a new one in the same opening, the new window's sill height must meet this standard — if the old window was installed too high (sill at 50 inches), you cannot simply drop in a new window of the same dimensions without a permit and framing inspection to lower the sill. Edwardsville's Building Department interprets this strictly: they require homeowners to submit a photo comparison (existing window and proposed replacement with dimensions noted) to confirm like-for-like status before exempting the work. If you cannot verify the opening size within 1/4 inch or if the sill height is unclear, the department will require a full permit application and a pre-work framing inspection (typically $75–$150). This verification step takes 3–5 business days via email to the department's permit coordinator.

Historic-district homeowners face a separate, parallel process. Edwardsville's Historic Preservation Ordinance requires all exterior window replacements in designated historic areas to receive Architectural Review Board (ARB) approval before any work begins. This is a design-review gate, not a building permit, but it is mandatory and often overlooked. The ARB requires photographs of the existing window, a detailed specification sheet for the proposed replacement (including frame material, profile, muntin pattern, and color), and a written justification if the replacement differs from the original in any way. Approval typically takes 2–3 weeks and costs nothing, but denial (or a request for modifications) can add another 1–2 weeks. Many window manufacturers (Andersen, Pella, Marvin) now offer "historic-match" product lines with true divided lites or simulated divided-lite designs that match period aesthetics; if you deviate from those, the ARB will likely ask for revisions. The ARB approval letter must be included in your permit application or exemption request, even if the window replacement itself is otherwise exempt from the building permit.

Outside the historic district, like-for-like replacements are truly exempt — no fee, no inspection, no paperwork. However, if you are enlarging the opening (common when replacing old, undersized casement windows with modern double-hung units), you will need a permit and a framing inspection. Opening enlargement falls under structural alteration and requires a certified plan that shows header sizing, load calculations, and proper flashing details. Edwardsville's Building Department charges $200–$350 for an opening-enlargement permit, depending on the number of windows. The inspection is typically done before installation (framing stage) and after installation (final). The timeline for opening-enlargement permits is 7–10 business days for plan review if the applicant submits accurate drawings; if details are missing, review can extend to 14 days. For comparison, a standard (no opening change) permit in nearby Belleville (5 miles south) costs $100 flat for up to 5 windows, making Edwardsville slightly higher but in line with similar downstate communities.

Energy code compliance adds another layer. Illinois has adopted the 2021 IECC (International Energy Conservation Code), which requires replacement windows to meet a U-factor of 0.32 or lower in Climate Zone 5A (northern Illinois, including Edwardsville). A U-factor is a measure of heat loss; lower is better. Most modern double-hung and casement windows from major manufacturers (Andersen, Pella, Marvin, Jeld-Wen) meet this standard, but older stock or budget-line products may not. The Edwardsville Building Department does not typically inspect U-factor values during a final inspection for exempt (like-for-like) replacements, but if a permit is required (opening change, egress adjustment), the department will request the NFRC (National Fenestration Rating Council) label from the window box to verify compliance. If you cannot provide documentation, the permit will be denied or conditional upon upgrading to a compliant window. This is a common hold-up; budget 3–5 additional business days if the window you chose does not meet the U-factor and you need to select a different product.

Tempered glass is required for windows within 24 inches of doors, above bathtubs, and in wet areas. IRC R612.3 mandates this for safety, and Edwardsville enforces it during inspections. When replacing a window adjacent to a sliding glass door or above a toilet, you must specify tempered glass (often called safety glass or 'tempered' on the label). Many replacement window kits include a specification sheet that notes whether the glass is tempered; verify this before purchase. If you order a window without tempered glass and the location requires it, you'll receive a failed final inspection and be required to replace the glass (labor $150–$250 per window) or return the entire unit. For like-for-like replacements where the original window was non-tempered (and thus installed pre-2006 when the code changed), you must upgrade to tempered glass during the replacement; this is not a code variance, it's a mandatory upgrade as part of permitting any change. Edwardsville's Building Department publishes a brief FAQ on its website (check the permit portal under 'Residential FAQ') that clarifies tempered-glass locations.

Three Edwardsville window replacement (same size opening) scenarios

Edwardsville's online permit portal and historic-district overlay — how they intersect

Edwardsville uses a single online portal (accessed via the City of Edwardsville website under 'Permits & Services') for both building permits and historic-district design review. This integration is helpful but creates confusion: many homeowners submit a building permit application without first obtaining ARB approval, then receive a rejection citing the historic-district overlay. To avoid delay, verify your address against the city's historic-district map (available as a PDF on the Community Development page) before you begin. If you are in the district, prioritize the ARB step — submit design-review photos and specs 3–4 weeks before you plan to install the windows. The ARB typically meets on the third Thursday of each month; if you miss a deadline, your review gets bumped to the following month.

Once ARB approval is obtained, attach the approval letter to your building-permit exemption request or permit application. The Building Department will not formally review a historic-district application without proof of ARB clearance. This sequential process adds 2–4 weeks to the overall timeline if you are not careful about scheduling. Some homeowners expedite by calling the Community Development Department before ordering windows and asking whether the style and material they're considering will likely pass the ARB — this is unofficial guidance, but it can save money and time if you discover a preference for true divided lites versus simulated ones before you've already purchased simulated-lite windows.

The portal itself is not particularly user-friendly; it requires an account login and a scanned or high-resolution photo upload. If you are over 65, the city offers in-person assistance at the Building Department office (located in City Hall, 118 Hillsdale Avenue). Calling the permit coordinator is often faster than navigating the online portal, especially for straightforward exemption requests. The coordinator's direct line is typically listed on the city website; if not, call the main city number (618-656-0600 during business hours) and ask for Building & Planning.

Energy code compliance and U-factor verification in Edwardsville

Edwardsville's adoption of the 2021 IECC sets a U-factor maximum of 0.32 for replacement windows in Climate Zone 5A. This is more stringent than older editions of the code and eliminates many budget-line window products from compliance. When you shop for windows, look for the NFRC (National Fenestration Rating Council) label on the box or the manufacturer's spec sheet; it will list the U-factor prominently. For reference, a typical vinyl double-hung from Andersen 200 series has a U-factor of 0.27; Andersen 400 is 0.25. Pella Impervia (fiberglass) is around 0.28. Budget windows from big-box retailers sometimes fall in the 0.35–0.40 range and will not pass Edwardsville's requirement. If you are purchasing windows for a permit-required project (opening change, egress adjustment), ask the supplier to print or email the NFRC label before you finalize the order. The Building Department will request this label during plan review, and if the window does not meet the U-factor, the permit will be conditional: you must either upgrade to a compliant window or obtain a variance (rare and often requires a hearing).

For like-for-like exempt replacements, energy-code compliance is not formally enforced by the Building Department — no inspector will check the label during a final inspection that doesn't exist. However, best practice (and long-term value) is to upgrade to current-code-compliant windows anyway; modern windows with lower U-factors will reduce heating costs by 10–20% compared to older windows. Some homeowners install older-stock or non-compliant windows in exempt replacements to save money, then later discover that if they apply for a permit for any other reason, the Building Department will flag the non-compliant window and require an upgrade or variance. Plan for compliance to avoid this hassle.

Common questions