Independent. We do not sell windows.
Most Chicago window replacements need no building permit at all
If you are replacing windows in kind in the existing openings of a house up to four stories, Chicago's own list of work that does not require a building permit covers you. That single fact is worth knowing before a salesperson quotes you for permit handling, and almost nobody publishes it.
chicago.gov, read 2026-08-11
What the city requires
No building permit for in-kind window replacement in the existing opening in a residential building up to four stories, and none in any building for repairing a window, replacing glass in an existing sash, or fitting a storm window. Landmark properties are the exception and are reviewed separately.
chicago.gov, read 2026-08-11
What it costs you
The cost pillar is live, and every figure on it names the publication, the author, the date that publication carries and the date we read it. One Chicago figure clears that bar: a standard vinyl double-hung at $650 to $1,200 per window installed. The same source's Illinois whole-home range, for 10 to 15 windows, is $6,000 to $16,000. Where no attributable Chicago number exists, we say so rather than substitute a national one.
Modernize, "Window Replacement Cost and Pricing in Illinois (2026)", Isabella Andersen, reviewed by Catie Bonner, updated March 18, 2026, read 2026-08-11. What window replacement costs in Chicago
The six guides
Everything on this site, in six places
- 01
Permits and Rules
When Chicago requires a building permit, when it does not, and what landmark status changes.
- 02
Cost
What the work costs, with every figure carrying the publication, the author and the date.
- 03
Window Types
Double-hung, casement, slider, bay, picture and storm, and which suits which opening.
- 04
Materials and Glass
Vinyl, wood, clad and fiberglass, plus what a U-factor actually tells you.
- 05
Chicago Homes
Bungalow, two-flat, three-flat, greystone and condo, each with its own window problem.
- 06
Hiring a Contractor
Licensing and insurance in Chicago, the questions to ask, and the red flags.
What this site is
An independent reference for Chicago homeowners replacing windows. We do not sell windows, we do not install them, and we have no stake in whether your answer is repair, replace, or wait. That is exactly why we can tell you when you do not need something.
The rules here are Chicago's, not general advice, and they are quoted with the date we read them:
- In-kind replacement is defined by the city, as using new elements "of the same type, size, and shape". That definition is what the whole permit exemption turns on.
- The exemption does not automatically carry to landmark property. Chicago states that these exceptions "may not apply" on a designated or proposed Chicago Landmark or in a landmark district.
- New openings and fire-rated glass are different jobs. Neither is eligible for the streamlined Express Permit Program route.
All three read at chicago.gov, 2026-08-11.
What we will not do
- Publish a price we cannot attribute. Every figure names its source and the date.
- Call anyone the best. We cannot document a ranking, so we do not claim one.
- Pretend a quote is an answer. Two quotes for different scopes are not comparable, and we will show you why.
Chicago housing stock
The window question is not the same in every Chicago house
A bungalow's art-glass transom, a greystone's landmark district, a three-flat's stacked sash, a high-rise unit's association approval letter. Four different jobs, four different answers.
Bungalow
Tawny common brick, a wide front window group, and a leaded transom that in-kind replacement has to reckon with.
Greystone
Rock-faced limestone and a projecting bay, and the housing type most likely to sit in a landmark district.
Two-flat and three-flat
Stacked bays of sash across two or three floors, which turns a per-window price into a large number quickly.
Condo
Where the association approval letter, not the city, is usually the first document you need.
Photographs are illustrative of the building type. They are not photographs of a job this site arranged.
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A marketing service, not a licensed contractor. Window work is performed by independent licensed local contractors.
Straight answers
Questions Chicago homeowners ask
- Do I need a permit to replace my windows in Chicago?
- Usually no, if you are replacing them in kind in the existing openings. Chicago lists work that does not require a building permit, and it includes, in a residential building up to four stories above grade, "Repairing or replacing (in-kind) an exterior window or skylight in the existing opening". In any building it also includes repairing a window, replacing the glass in an existing sash, installing a storm window, and replacing an existing ground-level window in kind where no part of the exterior wall is cut away. The city defines in-kind replacement as using new elements "of the same type, size, and shape". Read at chicago.gov 2026-08-11. Landmark properties are the exception, below.
- What if my building is a landmark or in a landmark district?
- Then do not assume the exemption applies. Chicago states plainly that "These exceptions may not apply to work on a property that is a proposed or designated Chicago Landmark or part of a proposed or designated Chicago Landmark district." The Historic Preservation Division "reviews all permit applications for work involving designated and proposed Chicago landmarks and landmark districts", and it encourages a pre-permit submission before you file. Chicago Landmark districts cover a great deal of the city's housing, and two-flats and greystones sit inside them. No bungalow district appeared among the Chicago Landmark districts we reviewed, which is our reading of the city's alphabetical landmarks listings page rather than an all-clear, because that page says it shows just a portion of the designations. So check your own address before you order windows. Read at chicago.gov 2026-08-11.
- When do I actually need a permit?
- When the job changes the opening or the glass type. Cutting a new opening in an exterior wall or roof for a new window is not eligible for the streamlined route, and neither is a window that has or is required to have fire-rated glass. Where a permit is needed for a straightforward replacement, the city's Express Permit Program "offers a streamlined way to obtain a building permit for replacement of doors, windows, and skylights in existing exterior wall and roof openings", and covers a building up to seven stories tall, or taller with drawings from an Illinois-licensed architect or structural engineer.
- A contractor quoted me for permit handling. Is that legitimate?
- It depends entirely on your job, which is why it is worth knowing the rule before the sales visit. If you are replacing windows in kind in the existing openings of a house up to four stories, and your property is not a landmark or in a landmark district, the city's own list says a building permit is not required. Ask which specific part of your job triggers a permit. A contractor who can answer that clearly is telling you something useful; one who cannot may be charging you for paperwork nobody needs.
- Do you sell or install windows?
- No. We are a marketing service. We publish what Chicago actually requires and what the work actually costs, and if you want quotes we pass your details to an independent licensed window contractor working in your part of the city. We are paid a referral fee by that contractor, and it never increases what you pay.