Willowdale, Downsview and Bathurst Manor were built out in the postwar bungalow boom of the 1950s and 60s, mostly on wide lots with driveway access, and today they sit closer to a subway line than almost any other bungalow belt in the city. That combination, easy digs and strong rental demand from two subway corridors, makes this stretch of North York one of the better underpinning cases in Toronto, with one added wrinkle the rest of the city does not have: land value pressure from the Yonge corridor high-rises pressing in from the east.
Rather just talk?
(289) 207-6470Tell us your basement perimeter and current ceiling height and we can give you a realistic range on the call.
- A firm, itemized price up front
- Permits and engineering in the number
- The real timeline, honestly
Get a real range
Not a brochure. Tell us the basics and we will come back with numbers that reflect your actual foundation.
A bungalow belt built for exactly this
North York's postwar subdivisions look a lot like Scarborough's on paper: detached bungalows, generous frontages, a driveway and a side yard on most lots. That is genuinely useful for underpinning, because the excavated soil comes out to a bin the easy way instead of being wheelbarrowed through the house.
Bathurst Manor, developed through the 1950s as one of the city's classic postwar bungalow subdivisions, still has a high share of original one-storey houses on lots wide enough for comfortable side access. Willowdale, further east toward Yonge Street, has the same bungalow stock but under more pressure, since its proximity to the Yonge subway and the Sheppard line has made the land underneath these houses worth more than it was when they were built. Downsview, to the west, mixes the same era of bungalow with newer infill on the former airfield lands, so the housing stock here is less uniform block to block than in Bathurst Manor.
All three sit on the same glacial clay till that underlies most of the old City of North York, which behaves predictably for underpinning excavation compared with sandier lakeshore soil. That is one less variable than a Beaches job has to account for.
The second-suite conversion wave
The reason underpinning conversations are happening across this belt right now is not really about basements. It is about subway proximity.
A basement apartment within walking distance of the Yonge-University line or the Sheppard line rents differently than one that requires a car, and Willowdale, Bathurst Manor and Downsview all sit inside or near that walkshed. Toronto has permitted second suites as-of-right in detached, semi-detached and row houses since 2019, and the province's more recent as-of-right multiplex rules pushed the door open further for adding units to an existing house. Zoning is rarely what stops these projects now.
What still stops them is the same thing it stops everywhere: ceiling height. A 1950s North York bungalow basement typically sits in the 6 foot to 6 foot 8 inch range, and a legal secondary suite needs meaningfully more than that. The full height math, the commonly applied minimum and the gap between legal and genuinely liveable, is covered in detail on the legal basement apartment page. Underpinning is the way a North York bungalow closes that gap, not a renovation trick above grade.
None of this is a judgement on your specific basement. Whether your footing needs four inches or four feet of additional depth is a question for a licensed engineer who has actually measured it, not a general description of the neighbourhood.
What the numbers look like on a North York bungalow
The Toronto-wide rate applies here exactly as it does everywhere else in the city: $500 to $750 per linear foot, the same permit fee structure, the same requirement for a licensed engineer's stamped drawings before anything is dug. Nothing about being in North York changes the per-foot math.
What changes is the dig, in the bungalow belt's favour:
| Factor | North York bungalow belt | Downtown row house |
|---|---|---|
| Site access | Driveway and side yard on most lots | Often no side access, spoil carried through the house |
| Structure | Mostly detached, no party wall | Attached, party wall on one or both sides |
| Typical perimeter | Larger footprint, more linear feet | Smaller footprint, fewer linear feet |
A typical Bathurst Manor or Downsview bungalow running about 130 linear feet of perimeter lands in roughly the same $65,000 to $97,500 underpinning-only range as a comparable Scarborough bungalow, before engineering, permit, waterproofing and slab bring a fully scoped job to somewhere around $85,000 to $135,000. Run your own footprint through the cost calculator rather than assuming a neighbourhood average, since perimeter and starting height are what actually move the number. The full breakdown of what makes up that total is on the cost page, and the process and timeline page covers the alternating-section sequence and the honest disruption timeline.
When the lot is worth more than the basement
To keep this honest, underpinning is not automatically the right call in every part of this belt.
- Close to Yonge Street in Willowdale, where land value has climbed hardest, some owners are better served financially by the lot itself than by a renovated basement, especially on a property that could support redevelopment. That is a real estate and financial planning question, not a construction one, and it deserves its own advice before a contractor is even in the picture.
- If the house needs work elsewhere first (roof, service upgrade, structural issues) address that before spending on the basement.
- If you are selling within a year or two, you carry the full cost and disruption and capture only a fraction of it back.
The subway proximity that makes a North York basement apartment rent well is the same force that makes some of these lots worth more empty than improved. Underpinning is the right answer for most owners who plan to stay. It is not automatically the right answer for every lot in Willowdale.
Common questions
Is North York a good candidate for underpinning?
Often, yes. The bungalow belt across Bathurst Manor, Downsview and Willowdale has wide lots with driveway access, which keeps excavation costs at the friendlier end of the citywide range, and subway proximity gives a converted basement genuine rental value.
What makes Willowdale and Bathurst Manor bungalows different from Scarborough ones?
Not much structurally. Both were built in the same postwar era with similar footings and lot shapes. The real difference is land value: Willowdale in particular sits close enough to the Yonge corridor that redevelopment economics enter the conversation in a way they rarely do further east.
Does subway proximity actually affect a basement apartment's value?
It affects the rent a legal suite can command and how quickly it fills, which is a genuine factor in whether the conversion pays for itself. It does not change the construction cost or the permit process.
Should I underpin or consider redeveloping the lot in Willowdale?
That depends on your specific property, the current zoning permissions, and your own financial goals, and it is a real estate and legal question that should be answered before a construction budget is set. We coordinate the underpinning side once that decision is made; we do not advise on land value.
Do Downsview's former-airfield-adjacent lots need special engineering?
Every lot gets its own engineering regardless of history. Downsview's mix of postwar bungalows and newer infill means the housing stock varies more block to block than in a uniform subdivision like Bathurst Manor, so a site-specific assessment matters more here than a neighbourhood generalization.
Rather just talk?
(289) 207-6470Tell us your basement perimeter and current ceiling height and we can give you a realistic range on the call.
- A firm, itemized price up front
- Permits and engineering in the number
- The real timeline, honestly
Get a real range
Not a brochure. Tell us the basics and we will come back with numbers that reflect your actual foundation.