Spacious detached homes in the Thornhill area of Markham, with Thornlea Secondary, Highway 407 and Viva on Highway 7 close by. Here is what daily life and housing look like in Thornlea.
Thornlea is a residential pocket in the Thornhill area of Markham, centred around Green Lane near Leslie Street, north of John Street and south of Highway 407. Aileen-Willowbrook sits to its west, closer to Bayview Avenue. Nearby Thornlea Secondary School, which opened in 1968 at Bayview Avenue and Willowbrook Road, shares its name.
Most homes are spacious detached houses, including two-storey executive family homes, with a few condo buildings nearby. Many homes here have Thornhill mailing addresses.
Thornhill Community Centre and Library is at Bayview Avenue and John Street, Thornlea Pool sits behind the high school, and Highway 407 and Viva rapid transit on Highway 7 are a short trip north.
Most homes are detached family houses on established streets.
Thornlea Secondary School offers French immersion and arts programs, and St. Robert Catholic High School is on Leslie Street. Always confirm catchments.
Thornlea Pool, plus Thornhill Community Centre and Library with a fitness centre, gymnasium and indoor track.
Highway 407 runs along the north edge, and Highway 404 is a few minutes east.
YRT buses run on Green Lane, Bayview Avenue and Leslie Street, and Viva Purple rapid transit runs along Highway 7.
The Yonge North Subway Extension, now under construction, will add stations along Yonge Street, including near Highway 7, a short drive west.
Detached homes make up most of Thornlea, with a few condo buildings nearby.
| Home Type | Where You’ll Find It | Who It Suits |
|---|---|---|
| Detached Homes | Two-storey family and executive homes on established streets | Families, move-up buyers |
| Homes With Separate Entrances | Some detached homes with walk-up or separate-entrance basements | Buyers who want flexible space or a possible second suite (check City rules) |
| Condos | A few buildings in and near the area | Downsizers, first-time buyers, investors |
Prices vary by street, lot size and condition. Want to know what homes like yours are selling for? Request a free home valuation.
School boundaries change. Always confirm them with the school board for a specific address.
Thornlea is in the Thornhill area of Markham, centred around Green Lane near Leslie Street, north of John Street and south of Highway 407. Aileen-Willowbrook sits to its west.
Yes. Thornlea is a neighbourhood within the broader Thornhill area on the Markham side, and many homes here have Thornhill mailing addresses. Read our Thornhill guide.
Mostly spacious detached family homes, with a few condo buildings nearby.
Many families look at Thornlea for its detached homes, recreation and nearby schools, including Thornlea Secondary School and St. Robert Catholic High School. Confirm school catchments for any specific address.
Highways 407 and 404 are close, and Viva Purple runs along Highway 7. Actual times depend on direction and time of day.
It depends on your property, timeline and goals. Book a call and we will walk through current activity on your street and what it means for your plan.
Source: Government of Canada, Yonge North Subway Extension milestone (July 2026).
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