Do You Need a Permit for Glass Repair in Toronto or the GTA?
Replacing the glass or sealed unit in an existing window frame doesn't change the opening, so it is generally treated as a repair rather than a window replacement. In Toronto, even a full same-size window replacement in a detached, semi-detached or row house with one dwelling unit needs no building permit; permits apply to window replacement in other building types (condos, multiplexes, mixed-use) and to new, enlarged or moved openings. Heritage districts have separate rules, and Markham and Newmarket exempt repairing broken panes to original specifications.
Glass-only work, a new pane or sealed unit in the existing sash, doesn't change the opening's size, location or structure. Toronto's permit list doesn't mention it separately, and in a house it is generally treated as repair.
Toronto: no building permit even for a same-size, same-location window or door replacement in a detached, semi or row house containing a single dwelling unit.
Toronto: a permit is required to replace whole windows or doors in any other building type, and to add, enlarge or relocate an opening anywhere. In a condo or multi-unit building, check before booking any glass work.
Mississauga and Newmarket publish the same basic rule (no permit for same-size replacement; permit for new or enlarged openings); other GTA rules could not all be confirmed, so check with your municipality's building department.
Markham and Newmarket both exempt repairing broken window panes to original specifications from heritage permits. Replacing whole windows needs a Minor Heritage Permit in Markham, and a heritage permit for visible windows in Toronto's 27 heritage conservation districts.
No permit does not mean no rules: replacement glass must still be safety glass wherever the Ontario Building Code requires it.
On this page
Replacing the glass in an existing window, whether a single pane or a sealed unit, doesn't change the opening, its size or its structure, so it is generally treated as a repair, not a window replacement. In a detached, semi-detached or row house with one dwelling unit in Toronto, the question hardly arises: the City doesn't require a building permit even to replace a whole window in the same opening. Permits come into play for window replacement in other building types, including condos and multiplexes, and for adding, enlarging or moving an opening anywhere.
Two things complicate that simple answer. Rules outside Toronto are set by each municipality, and not all of them publish clear guidance. And if your home is in a heritage conservation district, a separate heritage permit may apply to visible windows, although several GTA districts explicitly exempt repairing broken panes. This guide covers what we could confirm, what we couldn't, and how to check your own case.
Glass repair vs window replacement: why the difference matters
A glass repair keeps the frame and sash in the wall and swaps only the glass. A window replacement removes the frame and installs a new window in the opening. Permit rules are written around the second, which is why most glass work sits outside them.
| Job | Changes the opening? | Toronto house, one unit | Condo, multiplex or mixed-use (Toronto) |
|---|---|---|---|
| New pane or sealed unit in the existing sash (glass repair) | No | No permit; generally treated as repair | Not addressed separately; check with your condo corporation or Toronto Building |
| Whole window replaced in the same-size opening | No | No permit | Permit required |
| Opening enlarged, added or moved | Yes | Permit required | Permit required |
The glass-repair row is our reading of a list that doesn't mention glass-only work; we'd rather you confirm than assume.
Toronto's rules, word for word
The City of Toronto's "When do I need a building permit" page is explicit about window and door replacement:
- No permit for "Replacing a window or door in an existing opening in a detached house, semi-detached house, or row house containing a single dwelling unit", provided there is no change to the location or size, the structural support for the opening is not altered, and no new exit is created.
- Permit required for "new windows or doors where there were none before" and for "enlarging or relocating existing windows or doors".
- Permit required for "Replacing windows or doors in buildings other than a detached house, semi-detached house, or row house containing a single dwelling unit".
If a frame has failed and the whole window has to go, that's a window-replacement job rather than a glass repair, and this is how Toronto's rules play out:
| Your situation (Toronto, whole window replaced) | Building permit? |
|---|---|
| Detached, semi or row house, one unit; same-size window in the same opening | No |
| Same house, but you're making the opening bigger (e.g. a larger basement window) | Yes |
| Same house, cutting a new window or door where there wasn't one | Yes |
| Same house, moving a window or changing the header or structural support | Yes |
| Duplex, triplex or house with a second unit | Very likely yes (more than one dwelling unit); confirm with Toronto Building |
| Condo apartment building | Yes (plus condo approval; see below) |
| Condo townhouse | Check with Toronto Building and your condo corporation |
| Mixed-use building, storefront with apartments above | Yes |
Replacing just the glass
The City's list is written about replacing windows and doors. It doesn't separately mention replacing only the glass or sealed unit inside an existing frame, which is what a glass-only repair does. That work doesn't change the opening, its size or its structure, and in a house it is generally treated as repair. In a condo or other multi-unit building, check with your condo corporation or property manager first and, if there's any doubt, ask Toronto Building.
Outside Toronto: what we could and couldn't confirm
Each municipality administers the Ontario Building Code locally and publishes its own guidance. We checked official sources for the GTA municipalities we serve. None of them addresses glass-only work separately; here is what they say about window replacement as of September 2026:
| Municipality | What official sources say about window replacement | What to do |
|---|---|---|
| Toronto (incl. North York, Scarborough, Etobicoke) | Clear rules, above | Follow the tables above |
| Mississauga | An undated City permit guide lists "Windows – replace existing with same size" and the same for doors as not requiring a permit; adding or enlarging does. The guide doesn't say whether it applies to every building type. | Confirm with Mississauga Building, especially for condos and multi-unit buildings |
| Brampton | The City's "When a Permit Is Not Required" page does not mention windows or doors | Check with your municipality |
| Vaughan | Not confirmed from an official page | Check with your municipality |
| Markham | Not confirmed from an official page (heritage rules below are confirmed) | Check with your municipality |
| Richmond Hill | Not confirmed from an official page | Check with your municipality |
| Newmarket | The Town's building and renovating page lists "Replacing doors and/or windows that are the same size as existing" as not needing a permit, while "New or enlarged windows/doors" do. Heritage rules below are also confirmed. | Confirm with Newmarket Building Services for condos, multi-unit buildings and heritage properties |
When you call, ask three questions: Is replacing only the glass in an existing frame treated as a repair for my building type? Does a same-size window replacement need a permit? Is my property designated or in a heritage conservation district?
Heritage districts: where repair is written into the rules
A heritage permit is not a building permit. It's a separate approval under the Ontario Heritage Act, and it can apply even where no building permit is needed. It generally depends on whether your property is individually designated or sits in a heritage conservation district (HCD). The good news for glass repair is that heritage rules consistently favour repairing what's there.
Markham
Markham has four HCDs: Buttonville, Markham Village, Thornhill and Unionville. "Repair of broken window panes to original specifications" does not require a heritage permit, while "Removal and replacement of windows or doors" requires a Minor Heritage Permit. The City's district guidance sums up its philosophy: "It is better to maintain than to repair / It is better to repair than to restore / It is better to restore than replace".
Newmarket
Newmarket's Lower Main Street South HCD has 72 designated (Part V) properties. "Repairing broken window panes to original specifications" is exempt from heritage permits.
The Markham and Newmarket exemptions are useful after a break: you can get the glass replaced to match without waiting on a heritage approval, as long as it is to original specifications. "Original specifications" is the key phrase. If you want to change the glass type, divided-light pattern or frame, ask the heritage staff first.
Toronto
Toronto has 27 HCDs, designated since 1985. They include Cabbagetown, Rosedale, Riverdale, Harbord Village, the East Annex, the West Annex (Phase 1), Yorkville-Hazelton, Wychwood Park, Kensington Market, St. Lawrence, Weston and Teiaiagon-Baby Point, among others. West Queen West was under appeal and West Toronto Junction was in development at the time we checked.
The City's HCD guidance says:
- Routine maintenance, interior changes and exterior changes not visible from the street do not need a heritage permit.
- Owners are not required to replace existing windows.
- "If you choose to replace your existing windows and doors that are visible from the sidewalk, you will need a heritage permit."
Toronto's guidance doesn't say in so many words whether replacing a broken pane counts as routine maintenance, so if the window is visible from the street and you're changing anything about the glass, ask heritage staff first. Designated properties can also apply to Toronto's Heritage Grant Program, which covers repairing original windows and doors; the next deadline listed is 7 November 2026. Hardware repairs on original sashes, like the ones in our window balance guide, fit that repair-first approach.
Vaughan and Mississauga
Vaughan has HCDs at Kleinburg-Nashville, Maple, Thornhill-Vaughan and Woodbridge. Mississauga has HCDs at Meadowvale Village, Old Port Credit Village and Streetsville, and states that "All properties that are within a Heritage Conservation District are designated heritage properties". We could not confirm window-specific heritage permit rules or pane-repair exemptions for either city, so check with heritage staff before changing visible windows or glass.
Condos: the building permit is only half of it
In Toronto, replacing whole windows in a condo needs a building permit, because it isn't a single-unit house, and glass-only work isn't addressed separately. But condo owners usually hit a different gate first. Windows are often common elements, and "Most owner-proposed changes require board approval and a formal agreement under section 98 of the Condo Act". The board must approve by resolution before the change, and the registered agreement sets out who repairs, maintains and insures the new work. A like-for-like glass repair is a much smaller ask than an owner-proposed change, but the declaration still decides who books it. Our guide to condo window and balcony door glass covers responsibility in detail. This is general information, not legal advice.
No permit doesn't mean no rules
Even when no permit is required, the finished work still has to meet the Ontario Building Code. The 2024 code took effect on 1 January 2025, so confirm the current wording before you rely on a specific clause.
- Safety glass (applies to glass repair). Glass in sliding doors, storm doors, some entrance-door glass, larger sidelights that could be mistaken for doors, and shower and bathtub enclosures must be safety glass under the Ontario Building Code. Replacing a pane in those locations with ordinary annealed glass is a problem, permit or not. See tempered vs laminated safety glass.
- Bedroom egress (applies if a whole window is replaced). A bedroom window relied on for emergency exit needs an unobstructed opening of at least 0.35 m² with no dimension under 380 mm, must open without tools, and (except in basements) has a sill height limit of 1,000 mm. New glass in the existing sash leaves the opening as it was, but a replacement window with a smaller opening or a fixed pane can fail that, even in the same rough opening.
What we'd do
For almost all of our work, the permit question doesn't come up: we replace the glass or sealed unit in your existing frame, so the opening doesn't change. Where a job involves a condo, a multi-unit building or a heritage property, we'll tell you before we start what approvals to check, and we match glass to original specifications where a heritage exemption depends on it. If the frame itself has failed, that's a window-replacement job, not a glass repair, and we'll tell you so; the building-permit rules above are then the ones to check.
Next step
If you're replacing glass in an existing frame, you can usually go ahead once you've checked your building type and heritage status. See our window glass replacement service or ask us for a free quote and mention your municipality and building type.