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 · Milton, Halton Region
Legal Basements in Milton
A legal basement apartment in Milton starts with two checks: that your house is a type the Town’s additional unit rules cover, and that the lot has municipal water and sewer. Then we design the separate entrance, fire separation, egress windows and heating for two households, file the set with the Town of Milton Building Division through the Amanda Permit Portal and build the unit.
- Building
designs - 200+
- Years of
practice - 10
- Trusted
partners - 20+
- Recent project
- Vaughan · 1,100 sq ft
- Municipality
- Milton, Halton Region
- Permit office
- Town of Milton Building Division
- From our office
- Within an hour
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 Milton the package goes to the Town of Milton Building Division, and it is drawn to that department’s checklist.
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
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
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
- Rental incomeFrom an empty basement
- Space for familyA place of their own
- Buying a houseLegalize the basement before you close
- City noticeAbout an unpermitted unit
- Low ceilingIs underpinning worth it?
- One contractorDrawings, permit and build
- Not sure it applies?Tell us about it on a free call and we’ll say whether this is the right service.
What you get
07
items in your package, all from one P.Eng and BCIN team.
Drawn & stamped in-house
- Site visitHeight, egress and entrance checked
- Permit drawingsLayout, fire separations, structure, HVAC
- Building permitFiled and followed to issue
- Entrance & fire assembliesFramed, insulated and fire-rated
- Plumbing, electrical, HVACInstalled and inspected
- Kitchen & bathroomAnd the finishes
- 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.
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.
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.
Build
Entrance, framing, rough-ins, insulation and rated assemblies go in, inspected at each stage.
Finish & close out
Kitchen, bathroom, flooring and doors, then the final inspection and the closed permit.
- 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
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
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 thisA 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
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
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
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
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
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 thisPhoto plates
Project Gallery: from the framing to the finished room.
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
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
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
- Richmond Hill (completed project)Office
- Vaughan (completed project)
- Markham (completed project)
- Aurora
- Newmarket
- King
- Whitchurch-Stouffville
- East Gwillimbury
- Georgina
Toronto & Peel
- Toronto (completed project)
- Mississauga
- Brampton
- Caledon
Halton
- Oakville
- Burlington
- Milton
- Halton Hills
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
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
Before you call
FAQ: legal basements in Milton, answered.
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 at Milton’s own building department rather than Halton Region. The stairwell for a new entrance changes the grade beside the house, and Milton’s site alteration by-law reaches house lots too, past its exemptions for minor landscaping, so we check the stairwell against it. 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 Milton issues the building permit. We check the regulation mapping before the entrance is drawn.
In Milton’s urban area, a property with municipal water and sewer connections that has a detached house, semi-detached house, semi-link house or townhouse (not stacked or back-to-back townhouses) can have up to three additional residential units, with no more than one of them in a detached building on the same lot. In January 2026 the Town updated its Official Plan and Zoning By-law to allow additional residential units in rural areas, with limits that vary by zone. The house type matters as much as the basement here, so we confirm yours is one the rule covers before any drawing starts.
Yes. We take on legal basements across Milton, including Old Milton and Timberlea, 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 Milton Building Division will ask for before we quote.
The one for the area the house is in: Zoning By-law No. 016-2014 in the urban area, or No. 144-2003 on a rural property. In January 2026 the Town changed its Official Plan and zoning so rural properties can have additional units too, within limits that depend on the zone, so for a rural house we read that zone’s limits before anything is drawn for the Town of Milton Building Division.
On a serviced urban lot, the count allows it: a qualifying house in Milton can have up to three additional units, and one of those may stand in a detached building. A basement unit plus a garden suite fits that, so we draw the basement with the side yard kept clear for the suite’s water and sewer route. The Town of Milton Building Division reviews the suite as a new building when you go ahead with it.
Yes. We start the application in the Amanda Permit Portal, the Town of Milton’s online permit service, and whoever is signed in as the applicant can see the file and its status there. If the examiner at the Town of Milton Building Division comes back on the fire separation, the exit or the headroom, we answer each comment and upload revised sheets until the permit is issued.
That depends on two sets of rules. Ontario’s O. Reg. 299/19 asks for one space per additional unit, and a tandem space behind the main household’s car is allowed, unless the zoning by-law needs no space for the main unit or says none is to be provided for the extra one. We check the parking rules in Zoning By-law No. 016-2014 for your lot and show the space on the site plan the Town of Milton Building Division reviews.
It can, since digging the entrance stairwell cuts roots close to the house. The Town of Milton advises getting a certified arborist’s opinion before you remove a tree that stands wholly on your property, and on a lot over 0.5 hectares or wholly inside the Regional Greenlands System it points owners to Halton Region’s tree removal regulations. We plot the trees from the survey and pick the side for the entrance that leaves them standing, before the set reaches the Town of Milton Building Division.
Yes, and before the offer is firm is the time. We confirm that the house is a type Milton’s unit rules cover and that the lot has municipal water and sewer, check whether Conservation Halton’s regulated area reaches it, and measure the basement from floor to joist. Our director is also broker of record at our sister real estate company, so he can tell you how a legal unit might change what the house is worth.
Searched & answered
People Also Ask: what Milton 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 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
Legal basement permits in Milton
In Milton the reviewer is the Town of Milton Building Division. Every Milton 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 Milton Building Division’s own checklist.
Legal basement apartments in Old Milton and Timberlea
Milton’s housing is mostly single- and semi-detached houses built since the early 2000s, around mature neighbourhoods such as Old Milton. On a semi the side yard is often the only place a separate entrance can go, so the stair, guard and drainage are drawn to fit it, or the unit takes the escape-window route instead. We measure it on the first visit, whether the house is in Dorset Park or Mountainview.
Newer Milton houses and the five-year rule
The 2024 Building Code’s renovation rules for a second unit apply once a house has stood for five years. They allow a 30-minute fire separation between the units, and they let one unit’s exit pass through the other if an additional escape window is provided. Milton’s housing is mostly single and semi-detached houses built from the early 2000s on, so many basements qualify on age alone.
The exception is a house completed within the last five years on one of Milton’s newest streets. Its basement unit follows the rules for new construction instead, so we confirm the completion date from the original permit or the closing papers on the first visit, and the separation and exits we draw for the Town of Milton Building Division follow from that date.
Basement units in Milton townhouses and semi-links
Milton’s unit rules name the semi-link house and the townhouse alongside detached and semi-detached houses, as long as the lot has municipal water and sewer, and they leave out stacked and back-to-back townhouses. We confirm which type the house is before anything else, because the type decides whether a unit is allowed at all.
An inside townhouse shares both side walls, so its separate entrance has to go at the front or the back, and both households’ parking has to fit on the one driveway. We draw the entrance, the escape window and the parking together on the site plan, and the Town of Milton Building Division reviews them with the rest of the unit.
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