
The way in
Separate entrance
A new exterior door cut into the foundation, with the stairwell, guard and drainage designed so the opening does not weaken the wall.
- Foundation opening design
- Stairwell & drainage
- Guards & lighting
- Frost & waterproofing
Legal Basements · Barrie
Legal basement apartments in Barrie, where a house in a residential zone can take up to three additional units and a basement unit uses one of them. We check headroom and exits on site, draw the entrance, the separation between the two homes and their heating, and file the set with the City of Barrie Building Services through APLI.

What’s included
A legal unit is a list of code items, and the inspector checks each one. We design to that list, build to it, and book the inspections in the order the city wants them. In Barrie the package goes to the City of Barrie Building Services, and it is drawn to that department’s checklist.
The package
Find your situation below. If it’s there, this is the service, and the card underneath is everything you get from our one office.
06 common situations
07
items in your package, all from one P.Eng and BCIN team.
Drawn & stamped in-house
How it runs
Four steps from a bare basement to a closed permit, with the inspections built into the schedule.
We measure the ceiling, look at the windows, the entrance options and the mechanical room, and tell you whether the basement can be made legal and what it will take.
Layout, separations, the structural opening and HVAC are drawn in one office and filed with the municipality. City comments are answered at no extra charge.
Entrance, framing, rough-ins, insulation and rated assemblies go in, inspected at each stage.
Kitchen, bathroom, flooring and doors, then the final inspection and the closed permit.
Case files
Open any file for the scope, the disciplines involved, what we delivered and what the owner came away with.

A compact two-storey suite in a Toronto backyard. Architectural and structural drawings, zoning review and a framing package that makes every square foot count.
Delivered
New living space on a lot the owners already had.
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Structural walls came out and rooms were added to open the plan. Beam and column design, permit drawings and renovation coordination through to final inspection.
Delivered
An open layout where the load-bearing walls used to be.
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A code-compliant second unit with its own entrance, fire separations between the units, HVAC design and the full permit package.
Delivered
A legal second unit that brings in rent and adds property value.
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A new build taken from the client’s sketch to occupancy, with the architectural, structural and mechanical design done by one team.
Delivered
Built to the client’s own plan, with one team answering for every discipline.
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A two-storey garden suite laid out to get the most usable space from the footprint, designed and permitted as a rentable unit.
Delivered
Rental income and a higher property value.
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A dental office converted into a supermarket. Interior renovation, a new plumbing system and fire separations upgraded to the Ontario Fire Code.
Delivered
A dental office reopened as a supermarket, compliant with the Ontario Fire Code.
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A custom covered porch that turns the front of the house into usable outdoor space. Addition design and structural drawings for the permit.
Delivered
More usable outdoor space and added home value.
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Site grading to manage drainage and prepare the land for a new driveway, drawn as a grading plan for the site alteration permit.
Delivered
Drainage handled and the land ready for a new driveway.
Start a project like thisPhoto plates
Additions, basements, kitchens, new builds and commercial fit-outs. Drag a row to scrub through it, or open any photo full size.Tap any photo to see it full size.
21 platesResidential, commercial & new build
The drawing set
Framing schedules, wall assemblies, dimensions and a city review stamp, as issued. Client title blocks are trimmed off to protect the people we drew them for.
Drawing set
Sheets in this set
Sheet title
Existing basement plan
The existing house recorded before any design: beams, joists and bearing walls.
Drawing no.
2 of 5
Service area
From the office we cover the whole GTA, north to Barrie and Orillia, east to Peterborough and Cobourg, west to Kitchener and Brantford, and down through Niagara.
46 across 8 regions
York Region
Toronto & Peel
Halton
Durham
Simcoe & Dufferin
Waterloo, Wellington & Brant
Hamilton, Niagara & Haldimand
Kawarthas & Northumberland
Past the 90-minute line
We've also completed projects in London and Strathroy. Farther out than that? Call (416) 990-9179 and ask.
Permits filed with municipalities including
Before you call
Anything we haven’t answered here, we’ll answer on a call. The first consultation is free.
(416) 990-9179A building permit for the unit, applied for with drawings. Barrie is a single-tier municipality, so there is no regional office in the process. Barrie also has a site alteration by-law, and we check it whenever the stairwell for a new entrance changes the grade beside the house. We prepare and file the set and deal with the examiner’s comments.
Only where the lot is inside Lake Simcoe Region Conservation Authority (LSRCA) regulation, near a watercourse, a valley or a floodplain. Digging a stairwell down to the basement changes the grade there, and the LSRCA permit may be needed before Barrie issues the building permit. The west of the city is under the Nottawasaga Valley Conservation Authority. For a lot there, we read that authority’s mapping instead, before the entrance is drawn.
Barrie allows up to four residential units per lot in residential zones, so an owner can add up to three additional residential units to an existing home. These units can be inside the main house, attached to it, or detached from it, and accessory buildings such as coach houses or garages are eligible, provided the units meet the zoning standards for the property’s zone. That can leave room for more than one extra unit, so we plan the basement layout with any later unit in mind before anything is filed.
Yes. We take on legal basements across Barrie, including Allandale and Painswick, within an hour of our Richmond Hill office. The first consultation is free, by phone or on site.
Three things to start: property address; basement ceiling height, measured floor to joist; and photos of the basement, the mechanical room and the outside wall where an entrance could go. Send those and we tell you what the City of Barrie Building Services will ask for before we quote.
Yes, and we have done it in Barrie: a review on our site is from an owner whose basement apartment we legalized through the City, preparing the drawings and dealing with its requirements. On site we look at the ceiling height, the bedroom windows, what separates the unit from the floor above and how it is heated, and the drawings then show each change the Building Code calls for. The application goes to the City of Barrie Building Services through APLI, and the unit becomes one of the three additional units the lot can hold.
Yes. Under O. Reg. 299/19 the person in an additional unit can be anyone, family or not, and Barrie permits up to three such units on a residential lot. The unit still needs its building permit from the City of Barrie Building Services, and we prepare that application and file it in APLI.
Usually one. O. Reg. 299/19 asks for a single space for whoever lives in the unit, and it can sit in tandem in the driveway, unless the zoning requires no space for the main home or rules out a space for the unit. Where it can go depends on the lot’s zone, under By-law 2009-141 for most of Barrie, so we fit it on the site plan before choosing the entrance, and the City of Barrie Building Services checks both.
Rarely. By-law 2014-115 is aimed at woodlots, so it reaches a tree only when the tree belongs to one of half an acre or more, and a typical tree beside a Barrie house is outside it unless the work is tied to a development application. The stairwell can still cut roots, so the trees near the house go on the site plan for the City of Barrie Building Services, and we put the entrance on the side that spares the ones you want to keep.
Through APLI, which shows the application’s status and emails you when it changes. The update to wait for is the permit closing after the final inspection: the unit is legal from then, not from the day the City of Barrie Building Services issues the permit. We book each inspection with the City as the work reaches it.
Usually. Under Ontario’s Planning Act a zoning by-law cannot rule out three units on a serviced urban lot with a detached, semi-detached or rowhouse on it, and Barrie allows more, up to three additional units in its residential zones, within each zone’s standards. In a semi or a townhouse the shared wall and the side yard, if there is one, decide where the entrance and the fire separation go, so we look at those first and then file with the City of Barrie Building Services.
Searched & answered
Short answers to the legal basements questions people search most, and the broader topics they lead to.
Not covered here? Book a free consultationA legal basement is a basement apartment that meets the Building Code and the local zoning: a self-contained second unit with its own kitchen and bathroom. The code calls it a secondary suite, and Ontario’s planning rules call it an additional residential unit. Fine Engineering designs and permits these units across the GTA and coordinates the build.
At least 1.95 m, about 6 ft 5 in, under Ontario’s 2024 Building Code, with 1.85 m of clear height allowed under beams and ducts. The measurement runs from the finished floor to the finished ceiling, so new flooring and drywall count against it. Fine Engineering measures the height at the first site visit, before any layout is drawn.
It needs a safe way out, which is usually its own exterior door. In a house that has stood for five years or more, the 2024 Building Code’s renovation rules also accept an exit route through the other unit, as long as the suite gets an extra escape window that opens from inside without tools and the smoke alarms are linked. Fine Engineering works out which route suits the layout.
Yes. Once a house has a secondary suite, its smoke alarms must be interconnected, by wire or wirelessly, so one sets off the rest, and shared spaces need them too. A suite with a fuel-burning appliance, or one sharing a wall, floor or ceiling with such an appliance or a garage, also needs carbon monoxide alarms by its bedrooms. Fine Engineering marks every alarm on the permit set.
For many homeowners, yes. A legal second unit can earn rent and add property value, and because it was built under a permit, it avoids the trouble an unpermitted suite causes when the house is sold. The return depends on how much the basement needs, whether that is more headroom, a new exit or fire separation. Fine Engineering prices that work before any drawing starts.
Usually because the heat reaching the room does not match the heat it loses. A room over a garage, or one with more glass and outside wall, loses heat faster, and a long or undersized duct delivers less air than the room needs. A room-by-room heat-loss calculation and a duct design show where the gap is. Fine Engineering does both for existing houses as well as new ones.
Good to know
In Barrie the reviewer is the City of Barrie Building Services. Every Barrie lot sets its own terms: the spare capacity in the electrical panel and the size of the water service the two units will share decide how much work a basement unit needs.
We walk the site with the survey on a scheduled visit before anything is drawn, then file the legal basements package to the City of Barrie Building Services’s own checklist.
Barrie’s housing runs to high-density waterfront condos built since the 1980s beside established suburban neighbourhoods. In the houses, the exit settles most basement layouts: a new door where the side yard has room for a stair, or a shared exit or escape window where it does not. On a visit in Holly or Ardagh Bluffs, that is the first thing we look at.
Barrie allows additional units only where they meet the standards of the property’s zone. For most houses those standards are in Comprehensive Zoning By-law 2009-141, and inside the Allandale Major Transit Station Area they come from the Community Planning Permit System that replaced it there.
Some lots carry another municipality’s by-law. Secondary Plan land transferred from Innisfil in 2009 may still be zoned under Innisfil By-law 054-04, and land added on January 1, 2026 under Springwater By-law 5000 or Oro-Medonte By-law 97-95, so on those addresses we read the unit’s standards from that by-law.
The set we upload to APLI draws the basement existing and proposed, with the ceiling height under beams and ducts marked, the fire separation between the two units detailed, the exit from the unit and any escape window drawn to size, and the interconnected smoke alarms located. The heating and plumbing for the second household go in the same application.
The City of Barrie Building Services reviews that one set. When the examiner asks for a change, the request reaches us through APLI, and the revised sheet goes back into the same file rather than a new one.
Contact us
Send us the ceiling height and a few photos and we’ll tell you whether the basement can be made legal, on a free first call.
First consultation free(416) 990-9179