Legal Basements · Oakville, Halton Region

Legal Basements in Oakville

Legal basement apartments in Oakville, designed, permitted and built by one team: the separate entrance, fire separation, egress windows and heating for two units. We draw the unit to section 4.1.2 of Zoning By-law 2014-014, or to By-law 2009-189 between Dundas and Highway 407, and file it with the Town of Oakville Building Department through ePlan.

Building
designs
200+
Years of
practice
10
Trusted
partners
20+
Separate entrance stair down to a basement suite beside an enlarged window
Recent project
Vaughan · 1,100 sq ft
Municipality
Oakville, Halton Region
Permit office
Town of Oakville Building Department
From our office
Within an hour
Fig. 01 · Separate entrance stair down to a basement suite beside an enlarged windowRichmond Hill, ON

What’s included

Scope: what we take on, and what each part includes.

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 Oakville the package goes to the Town of Oakville Building Department, and it is drawn to that department’s checklist.

  • Finished legal basement apartment in Vaughan

    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
  • Basement conversion with exposed steel beams

    What the inspector checks first

    Fire separation & egress

    Rated ceilings and walls between the units, interconnected smoke alarms, and bedroom windows or doors large enough to get out through.

    • Fire-rated assemblies
    • Egress windows
    • Interconnected alarms
    • Sound separation
  • Kitchenette in a legal basement unit

    The wet side

    Kitchen & bathroom

    Plumbing for a second kitchen and bathroom, tied into drains that were never meant for them, with venting and hot water sized for two units.

    • Kitchen & bath layouts
    • Drain & vent tie-ins
    • Hot water for two units
    • Bathroom ventilation
  • Basement suite with a kitchenette and a living area

    Through to occupancy

    Inspection scheduling

    The inspections the permit calls for, booked as each stage is ready, and the paperwork closed so the unit is legal on paper as well as in fact.

    • Framing & insulation inspections
    • Plumbing & electrical inspections
    • HVAC & final
    • Permit close-out

The package

When you need it, and what you get.

Find your situation below. If it’s there, this is the service, and the card underneath is everything you get from our one office.

You need this when

06 common situations

What you get

07

items in your package, all from one P.Eng and BCIN team.

Drawn & stamped in-house

  1. Site visitHeight, egress and entrance checked
  2. Permit drawingsLayout, fire separations, structure, HVAC
  3. Building permitFiled and followed to issue
  4. Entrance & fire assembliesFramed, insulated and fire-rated
  5. Plumbing, electrical, HVACInstalled and inspected
  6. Kitchen & bathroomAnd the finishes
  7. A legal unitPermit closed, ready to list and insure

How it runs

Process: 4 steps from first call to sign-off.

Four steps from a bare basement to a closed permit, with the inspections built into the schedule.

  1. Site visit & code check

    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.

  2. Design & permit

    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.

  3. Build

    Entrance, framing, rough-ins, insulation and rated assemblies go in, inspected at each stage.

  4. Finish & close out

    Kitchen, bathroom, flooring and doors, then the final inspection and the closed permit.

What we need to start

Send what you have. We fill in the rest on the first call.

Book a free call
  • Property address
  • Basement ceiling height, measured floor to joist
  • Photos of the basement, the mechanical room and the outside wall where an entrance could go
  • Any existing drawings or a previous permit
  • Whether the unit is for family or for rent

Case files

Our Projects: real permits, real builds, real value added.

Open any file for the scope, the disciplines involved, what we delivered and what the owner came away with.

Files
08
Municipalities
07

Two-storey garden suite framing under construction in a Toronto backyard
Interior framing

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.

Location
Toronto
Area
700 sq ft
Sector
Residential
Disciplines
Architectural · Structural

Delivered

  • Architectural drawings
  • Structural framing design
  • Zoning review
  • Building permit application

New living space on a lot the owners already had.

Start a project like this

Richmond Hill home exterior after a full-home interior renovation
Home exterior

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.

Location
Richmond Hill
Area
2,700 sq ft
Sector
Residential
Disciplines
Structural · Architectural

Delivered

  • Load-bearing wall removal
  • Beam & column design
  • Permit drawings
  • Renovation coordination

An open layout where the load-bearing walls used to be.

Start a project like this

Finished legal basement apartment kitchen and living area in Vaughan
Basement kitchen

A code-compliant second unit with its own entrance, fire separations between the units, HVAC design and the full permit package.

Location
Vaughan
Area
1,100 sq ft
Sector
Residential
Disciplines
Architectural · Mechanical · Fire safety

Delivered

  • Separate entrance
  • Fire separations
  • HVAC design
  • Full permit package

A legal second unit that brings in rent and adds property value.

Start a project like this

Newly completed custom home exterior in Haldimand County
Finished bungalow

A new build taken from the client’s sketch to occupancy, with the architectural, structural and mechanical design done by one team.

Location
Haldimand County
Area
1,750 sq ft
Sector
Residential
Disciplines
Architectural · Structural · Mechanical

Delivered

  • Architectural design
  • Structural design
  • Mechanical design
  • Permit drawings

Built to the client’s own plan, with one team answering for every discipline.

Start a project like this

Completed two-storey garden suite with a double garage, Richmond Hill
Suite over garage

A two-storey garden suite laid out to get the most usable space from the footprint, designed and permitted as a rentable unit.

Location
Richmond Hill
Area
1,250 sq ft
Sector
Residential
Disciplines
Architectural · Structural

Delivered

  • Layout planning
  • Architectural drawings
  • Structural design
  • Permit application

Rental income and a higher property value.

Start a project like this

Kitchener plaza storefront converted from a dental office to a supermarket
Plaza storefront

A dental office converted into a supermarket. Interior renovation, a new plumbing system and fire separations upgraded to the Ontario Fire Code.

Location
Kitchener
Area
Dental → grocery
Sector
Commercial
Disciplines
Architectural · Plumbing · Fire safety

Delivered

  • Change-of-use permit
  • Interior renovation drawings
  • New plumbing design
  • Upgraded fire separations

A dental office reopened as a supermarket, compliant with the Ontario Fire Code.

Start a project like this

New covered porch addition under construction, London, Ontario
Porch framing

A custom covered porch that turns the front of the house into usable outdoor space. Addition design and structural drawings for the permit.

Location
London
Area
570 sq ft
Sector
Residential
Disciplines
Architectural · Structural

Delivered

  • Addition design
  • Structural drawings
  • Permit application

More usable outdoor space and added home value.

Start a project like this

Grading plan for a driveway extension and site alteration in Guelph
Grading plan

Site grading to manage drainage and prepare the land for a new driveway, drawn as a grading plan for the site alteration permit.

Location
Guelph
Area
11,700 sq ft
Sector
Site
Disciplines
Site engineering

Delivered

  • Grading plan
  • Drainage design
  • Driveway extension layout
  • Site alteration permit

Drainage handled and the land ready for a new driveway.

Start a project like this

The drawing set

Drawing Samples: sheets from real permit sets.

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.

Sector
Residential
Discipline
Architectural · Structural
Location
London, ON
Scale
—

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

Client reviews

  • Engineering

    Alexander is everything you could possibly hope for in a professional engineer: exceptionally knowledgeable, meticulous, honest, reliable … If you are looking for an engineer you can trust completely, Alexander is the person you want on your project.

    Karl Sarkadi

  • Legal Basement

    I used them to get a permit from the City of Barrie to legalize my basement apartment … they took care of all the drawings and dealt with the city's requirements so I didn't have to stress about it. … what could've been a huge headache turned out to be smooth and painless.

    Anatoly Dobrovinsky

  • Basement + Entrance

    We had an outstanding experience working with Alexander on the legalization of our basement apartment, including obtaining approvals for a separate entrance. … His expertise in dealing with permits, building code requirements, and municipal approvals gave us complete confidence throughout the project.

    Robert Grin

  • Triplex HVAC Design

    Fine Engineering helped us with the mechanical and HVAC design for our triplex project in Barrie. The design included a boiler system for the 3 units and radiant floor heating … I’m very happy with the final result, it’s a really comfortable system during winter seasons.

    Vanessa L.

  • Duplex Conversion

    They converted my house into a duplex and did the permit drawings for demolishing walls for our open concept in the living room. Alex was nice to explain the zoning bylaws and the construction process during the renovation.

    Cristian Chan

  • New Build Permit

    Alex did an amazing job with our new build permit in Haldimand county. Very fair price, excellent service, will recommend to others

    Aepex Electric

  • Garden Suite

    We hired Fine Engineering & Development to design our garden suite in Toronto … He recommended keeping our garage space and having heat pumps instead of gas furnace to reduce utility bills. During the city permit review, he also handled all the paperwork.

    Pia Bourjeily

  • Ongoing Projects

    Alex and his business has been a very valuable asset to our team and business. He is very resourceful, attentive, has great costumer service and amazing attention to detail.

    Harrisson Cabrera

  • Front Porch Permit

    Reviewed my drawings for a front porch and helped me get the proper documentation the city requested. Everything was done professionally and on time. Great to work with!

    Andre Teixeira

Service area

Where We Work: within 90 minutes of Richmond Hill.

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.

Our office
Service area
Completed project
Drive time, off-peak

Municipalities we serve

46 across 8 regions

  • York Region

  • Toronto & Peel

  • Halton

  • Durham

    • Pickering
    • Ajax
    • Whitby
    • Oshawa
    • Clarington
    • Uxbridge
    • Scugog
  • Simcoe & Dufferin

    • Barrie (completed project)
    • Innisfil
    • Bradford
    • New Tecumseth
    • Orillia
    • Wasaga Beach
    • Collingwood
    • Orangeville
  • Waterloo, Wellington & Brant

    • Guelph (completed project)
    • Kitchener (completed project)
    • Waterloo
    • Cambridge
    • Brantford
  • Hamilton, Niagara & Haldimand

    • Hamilton
    • Grimsby
    • St. Catharines
    • Niagara Falls
    • Haldimand County (completed project)
  • Kawarthas & Northumberland

    • Peterborough
    • Kawartha Lakes
    • Port Hope
    • Cobourg

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

  • City of Toronto
  • City of Richmond Hill
  • City of Brampton
  • City of London
  • City of Waterloo
  • City of Oshawa

Before you call

FAQ: legal basements in Oakville, answered.

Anything we haven’t answered here, we’ll answer on a call. The first consultation is free.

(416) 990-9179
  • A building permit for the unit, applied for with drawings at Oakville’s own building department rather than Halton Region. Oakville 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 Conservation Halton regulation, near a watercourse, a valley or a floodplain. Digging a stairwell down to the basement changes the grade there, and the Conservation Halton permit may be needed before Oakville issues the building permit. On a lakefront lot the shoreline is regulated too where it is at risk of flooding or erosion, so we check the mapping there even with no creek nearby.

  • Under Oakville’s Zoning By-law 2014-014, attached additional residential units are permitted in detached, semi-detached, linked and townhouse dwellings, and detached additional residential units are permitted in an accessory building associated with those dwellings. A property may have a maximum of two attached additional residential units, or one attached unit and one detached unit. A basement apartment counts as one of those units, and it still needs a building permit of its own.

  • Yes. We take on legal basements across Oakville, including Old Oakville and Bronte, 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 Town of Oakville Building Department will ask for before we quote.

  • That depends on where the lot sits against Dundas Street. South of Dundas, and north of Highway 407, it is Zoning By-law 2014-014, whose section 4.1.2 holds the additional unit rules we draw to; between Dundas and the highway, including most of the 2000s neighbourhoods north of Dundas, it is Zoning By-law 2009-189, and we read that by-law’s own provisions for your address. The Town of Oakville Building Department then checks the unit against the same by-law.

  • It may. Under O. Reg. 299/19 an additional unit needs one parking space, and a tandem space counts, unless the zoning by-law requires none for the main house or says none is to be provided for the unit. We read the parking rules in Zoning By-law 2014-014 or 2009-189, whichever covers your lot, and show the space on the site plan the Town of Oakville Building Department reviews.

  • It can. Digging a stairwell cuts roots, and Oakville’s Private Tree Protection By-law 2017-038 needs a permit before a private tree 15 cm or more across at breast height is injured, and the same goes for any tree an approved site plan requires. We plot those trees from the survey and put the entrance where it misses them; if no side does, we apply for the tree permit while the Town of Oakville Building Department reviews the unit.

  • Possibly, and where it goes is the first question. Old Oakville is one of the Town’s four heritage conservation districts, with First and Second Street, Trafalgar Road and Downtown Oakville, and a stairwell changes the outside of the house, so we look at a side or rear entrance before the front and confirm with the Town what the district asks. With the entrance settled, the rest of the unit goes to the Town of Oakville Building Department.

  • Through the Town’s Online Services, with the drawings reviewed in ePlan, which runs on ProjectDox. Whoever applies can sign in with a Town of Oakville account and follow the file’s tasks and status, and we answer each round of comments on the fire separation, exits or headroom in the same place until the Town of Oakville Building Department issues the permit.

  • Yes, and before the offer is firm is the time to do it. We check whether the lot falls under Zoning By-law 2014-014 or 2009-189 and whether Conservation Halton’s regulated area reaches it, then measure the basement’s floor-to-joist height and look for a side of the house where a stairwell could go. Our director is a real estate broker, so the findings come with a view on what a permitted unit would mean for the price.

Searched & answered

People Also Ask: what Oakville searches about legal basements.

Short answers to the legal basements questions people search most, and the broader topics they lead to.

Not covered here? Book a free consultation
  • A 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

Legal basement permits in Oakville

In Oakville the reviewer is the Town of Oakville Building Department. Every Oakville 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 Town of Oakville Building Department’s own checklist.

Legal basement apartments in Old Oakville and Bronte

Oakville’s housing runs to lakefront and older Oakville lots being rebuilt, 1980s Glen Abbey subdivisions and 2000s neighbourhoods north of Dundas. On a lot being rebuilt, a basement unit is easiest planned before the foundation goes in, with ceiling height and drain depth set on the drawings. In an existing house in Kerr Village or Glen Abbey, floor-to-joist height decides whether underpinning is needed.

Rebuilt houses and the five-year rule for second units

Once a house has stood for five years, the Building Code’s renovation rules accept a 30-minute fire separation around a second unit, and an exit through the other unit if an extra escape window is added. Basements in the 1980s Glen Abbey subdivisions and in the 2000s houses north of Dundas qualify on age.

The exception in Oakville is the rebuilt lot. A replacement house on a lakefront or older street can be under five years old, and then its basement unit follows the rules for new construction. We note the year the house was finished on the first site visit, and the separation and exits we draw for the Town of Oakville Building Department follow from it.

Leaving room for a garden suite later

Section 4.1.2 of Zoning By-law 2014-014 gives an Oakville property two patterns: two attached units in the house, or one in the house and one in an accessory building such as a garden suite. A second unit in the house uses up the allowance, and a suite could no longer follow.

If a suite is a possibility, we draw the basement as the only unit in the house, keep a side yard open for the service route to the back, and check the rear yard against Oakville’s tree by-law early. Our broker can talk through which arrangement suits the property before either is drawn.

Contact us

Entrance cut. Separation rated. Permit closed.

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