Short answer: you do not need a building permit in Barrie when a window or exterior door goes back into the existing opening at the same size. The City’s residential permit list puts “replace doors and/or windows that are the same size as the existing” in the no-permit column, and “create new openings for, or increase the size of, doors and windows” in the permit-required column. Change the hole in the wall and you need a permit. Fill the same hole with a better unit and you do not.
That one line settles the large majority of replacement jobs. Everything below covers the cases where it settles nothing — enlarged openings, new openings, basement egress, structural headers and heritage properties — plus how the process actually runs in Barrie and in the municipalities around it.
Permit at a glance
Use this as a first filter, then confirm with the building department that has jurisdiction over your address.
| Work | Building permit? | Who to talk to |
|---|---|---|
| Window replaced in the same rough opening | No | Your installer — no municipal application |
| Entry door replaced, same opening and swing | No | Your installer |
| Garage door replaced in the same opening | No | Your installer |
| Opening widened or heightened by any amount | Yes | Municipal building department |
| New opening cut in an exterior wall | Yes | Building department; engineer if load-bearing |
| Basement bedroom egress window added or enlarged | Yes | Building department |
| Window converted to a patio or garden door | Yes | Building department |
| Single door widened to a double, or sidelites added | Yes | Building department |
| Exterior change to a heritage-designated property | Heritage permit, plus a building permit if the opening changes | City planning / heritage staff first |
When you do not need a permit
Like-for-like replacement is treated as maintenance, not construction. In practice that covers:
- New units in the existing rough openings at unchanged dimensions — including a change of operation inside the same frame size, such as a fixed picture unit becoming a casement.
- A new entry door and frame in the existing opening, at the same slab width and height.
- A sectional garage door replacement where the header, jambs and opening stay as built.
Two cautions. “No permit” is not “no code”: opening limiters or guards are required on some upper-storey windows where the sill sits low and the drop outside is significant, and your installer should flag that before the order goes in.
Municipal permits are also not the only approvals in play. Condominium declarations, architectural control agreements in newer subdivisions and some lakefront covenants restrict frame colour, grille pattern and glass style. Read your paperwork before you sign a contract.
When you do need a permit
Enlarging an opening or cutting a new one
Any change to the framed opening is construction. Widening a window by 150 mm to gain light, dropping a sill to floor level, moving a door 600 mm along a wall — all of it needs an application, because all of it changes how load travels down that wall.
Expect the building department to want the header (lintel) size and span, the wall assembly, and confirmation that the structure above can carry the new arrangement. On a load-bearing wall that usually means engineered drawings and a commitment to general review by the engineer who sealed them.
Basement egress windows
This is the most common permit trigger we see in Barrie. If you are finishing a basement with a bedroom, the window in that room must meet Ontario Building Code egress rules: an unobstructed opening of at least 0.35 m² with no single dimension less than 380 mm, openable from the inside without tools, keys or special knowledge.
Both conditions apply at the same time. A 380 × 380 mm opening satisfies the dimension rule and fails the area rule badly — it gives roughly 0.14 m². Where the window discharges into a window well, the well must leave about 550 mm of clear space in front of the opening so a person can get out and turn.
Reaching those numbers in an existing foundation means saw-cutting concrete or block, installing a new lintel and excavating a well. That is a permit job in every municipality we work in, and one where the framing inspection genuinely matters.
Headers and load-bearing walls
Removing a section of a load-bearing wall to fit a wider unit changes the load path all the way down to the footing. Even a modest widening can push the existing header past its allowable span. The drawings, not the window, are usually the long pole in these projects.
Glass close to a property line
Less obvious: the Building Code limits the area of unprotected openings — glass, essentially — in an exterior wall based on its limiting distance from the property line. On a narrow infill lot, adding or enlarging a window on a side wall can hit that limit even though the structure is fine. Raise it early rather than after the order is placed.
Window-to-door conversions
Turning a dining-room window into a garden door is a new opening in code terms, header and all. Our patio and garden door projects are frequently permit jobs for exactly this reason.
Heritage properties and conservation districts
Barrie maintains a Municipal Heritage Register, and the properties on it fall into two groups. The difference matters.
Listed (non-designated) properties are flagged as being of potential cultural heritage value. Owners can generally paint, renovate, restore and add to the property as normal, although demolition triggers notice requirements.
Designated properties — designated under Part IV of the Ontario Heritage Act, or located inside a Part V heritage conservation district — are different. The designating by-law names specific heritage attributes, and original windows, door surrounds and façade proportions are among the most commonly listed. Altering a named attribute requires a heritage permit from the municipality on top of any building permit.
On timing: the Ontario Heritage Act gives council 90 days from the date a notice of complete application is served to decide. If council does not decide within that period and no extension has been agreed, the permit is deemed approved. Many municipalities delegate routine window work to staff, which is faster. Speak to planning staff before you specify anything — a sympathetic replacement agreed in principle at the start beats a refusal after you have paid a deposit.
How the application works in Barrie
Barrie accepts building permit applications online through its APLI portal at eservices.barrie.ca, where you can start an application, save it and resume later.
Expect to submit:
- Drawings, legible and to scale, establishing compliance with the Ontario Building Code, the Building By-law and the Zoning By-law.
- A floor plan and elevation marking the existing and proposed opening, dimensioned in both directions.
- A section or detail showing the new header size, bearing and any point loads.
- Engineered drawings plus a commitment to general review where the work is structural.
- The permit fee, calculated under the current Fees By-law, Schedule K.
Service Barrie handles questions: 705-726-4242, ServiceBarrie@barrie.ca, 70 Collier Street.
How long it takes
The Building Code Act sets prescribed review periods once an application is complete: 10 business days for houses and other Part 9 buildings. That clock covers the first technical review, not the whole file.
In practice, budget two to four weeks for a straightforward opening change, and add a similar block for each round of comments the reviewer returns. Incomplete or unscaled drawings are the leading cause of delay — which is the argument for having them prepared properly the first time.
What working without a permit costs
The Building Code Act, 1992 carries fines of up to $50,000 for an individual on a first conviction and up to $100,000 on subsequent convictions. For a corporation the maximums are $500,000 and $1,500,000. Those are ceilings, and prosecution is not the usual outcome.
The usual outcome is worse in slow motion: an order to comply, finished work opened back up for inspection, a retroactive application at a higher fee, and a disclosure problem when you sell. Insurers also take an interest in unpermitted structural work after a claim.
The rules shift across municipal lines
Neither Simcoe County nor York Region issues building permits. Every application goes to the local municipality, and the portals, fees and submission checklists differ.
- Barrie — APLI portal; Service Barrie at 705-726-4242.
- Innisfil and New Tecumseth — applications through Cloudpermit, each with its own fee schedule and required-documents list.
- York Region — Newmarket, Aurora and the other local municipalities each run their own building department. The Region does not issue permits at all.
The underlying Ontario Building Code is the same everywhere: the 2024 edition, O. Reg. 163/24, in force since 1 January 2025. What changes locally is the paperwork, the fee, the zoning by-law and how heritage approvals are administered. Our full coverage map is on the service areas page.
How we handle it
On like-for-like work there is nothing to file and we get on with the install. On opening changes we measure, prepare the drawings, coordinate the engineer where structure is involved and book the inspections. The application itself is filed in the property owner’s name, because the owner is the applicant under the Act — we do the legwork behind it and build the review time into the schedule before you commit to a date.
If you are weighing a bigger opening against a better window in the same one, our guide to energy-efficient windows for Barrie winters covers where the money actually goes. For a site visit anywhere in Simcoe County or York Region, get in touch or call (647) 448-8439.
