Second units and garden suites
64% of the 93,713 residential lots in Markham screen as likely to allow a garden suite; 89% a second unit in the house.
Residential lots by second-units screen| Likely allows additional units | 0 | 0% |
|---|
| Likely, with constraints | 87,570 | 93% |
|---|
| Check zoning / further investigation | 6,143 | 7% |
|---|
| Unlikely | 0 | 0% |
|---|
- Garden suite likely: 60,297 lots (64%).
- Third unit likely: 83,792 lots (89%).
Ontario's Planning Act (s. 35.1) and O. Reg. 462/24 allow up to three units on most serviced urban house lots; the municipal by-law sets the rest. Lot depth is estimated from lot lines, not a survey.
Source: Province of Ontario and the municipality, Planning Act s. 35.1, O. Reg. 462/24 and the municipal by-law, screened lot by lot by LSG Realty (2026-11-01); York Region, Regional Official Plan 2022, Map 1 (Urban Area, Towns and Villages) (2026-11-01); Statistics Canada, 2021 Census census subdivisions (cartographic boundary file) (2026-11-01); York Region, Parcel (property boundaries across York Region) (2026-11-01). Screened 2026-11-01.
Lot sizes
Median lot 388 m² (4,176 sq ft); half of the lots are between 269 m² and 585 m² (93,713 lots).
Source: York Region, Parcel (property boundaries across York Region) (2026-11-01).
Flood, Oak Ridges Moraine and Greenbelt
- Partly or wholly in a conservation authority regulated area (flood and erosion hazards): 3,772 lots (4%).
- In the Oak Ridges Moraine countryside, natural core or linkage areas: 1 lots (0%).
- In the Greenbelt's protected countryside or urban river valleys: 623 lots (1%).
Source: Toronto and Region Conservation Authority, TRCA Regulated Area (Regulation Limit 2025, O. Reg. 41/24) (2026-11-01); Lake Simcoe Region Conservation Authority, Regulation Limit (O. Reg. 41/24) (2026-11-01); Province of Ontario, Oak Ridges Moraine land use designations (2017 Plan) (2026-11-01); Province of Ontario, Greenbelt designations (2017 Plan) (2026-11-01).
Active development applications
971 active applications (rezonings, site plans, subdivisions, minor variances, consents) in Markham.
- Address not published · Site Plan · In Progress · Regional review: Intake, Geo-Referencing · 2026-10-07 · 26.134020.000.00.SPC (York Region file SP.26.M.0143)
- 8005 Kennedy Road · Site Plan · In Progress · Regional review: Approvals, SP/ENG Approval · 2026-10-05 · SPM01001 (York Region file SP.01.M.0051)
- 10228 McCowan Road · Site Plan · In Progress · Regional review: Intake, Cursory Evaluation · 2026-09-09 · 26.129948.000.00.SPC (York Region file SP.26.M.0122)
- 45 Stollery Pond Crescent · Local Official Plan Amendment (Approval) · In Progress · Regional review: Approvals, Data Processing · 2026-08-27 · 26.120569.000.00.PLAN (York Region file LOPA.26.M.0026)
- 193 Main Unionville Street, 189 Main Unionville Street · Site Plan · In Progress · Regional review: Intake, Geo-Referencing · 2026-08-07 · 26.128404.000.00.SPC (York Region file SP.26.M.0093)
Source: York Region, Active Development Application Boundaries (York Region's review of applications in its nine municipalities) (2026-10-27).
Building permits, last 12 months
Markham does not publish building permits as open data that we can show.
Upcoming residential projects
234 proposed, approved or under-construction projects with about 76,781 units published.
- South of Highway 7, East of Warden Avenue · Approved: 4,777-unit residential subdivision
- East of Ninth Line and North of Hwy 7 · Proposed: 33-storey, 3,771-unit apartment building
- 110 Clegg Road, 100 Clegg Road · Proposed: 2,666-unit mixed-use building, up to 46 storeys
- 10379 Kennedy Road (and 6 more addresses) · Approved: 2,305-unit residential subdivision
- 10536 McCowan Road (and 5 more addresses) · Proposed: 2,305-unit residential development
From municipal open data. Not a listing or an offer to sell; details change.
Source: York Region, Planning applications and building permits (residential projects) (2026-10-27).
Rapid transit within 800 m
- Bridge (planned) · Planned station · Planned subway
- Centennial GO · GO station · Stouffville
- Clark (planned) · Planned station · Planned subway
- Markham GO · GO station · Stouffville
- Mount Joy GO · GO station · Stouffville
- Unionville GO · GO station · Stouffville
Source: TTC, Metrolinx and York Region Transit, Rapid transit stations (the map's transit layer) (2026-10-31).
Public schools
YRDSB school locator (York Region District School Board)YCDSB school locator (York Catholic District School Board)
Source: Ontario Ministry of Education, Ontario public school contact information (placed by Statistics Canada ODA addresses) (2026-10-29). School catchments change; confirm with the board's school locator.
Water and sewer servicing
Regional capacity assigned; local figure not published · Markham (urban area)
Served by the York Durham Sewage System. York Region assigned about 88,348 persons of new capacity to the cities and towns on the York Durham Sewage System (Dec 11, 2025), bringing total available capacity to 286,992 persons, up to 13 years of growth. The City's own remaining allocation: Not published in the reports we could read. Report.
Source: Province of Ontario (Land Information Ontario), Municipal Boundary – Lower and Single Tier (2026-11-01); York Region, Regional Official Plan 2022, Map 1 – Regional Structure: Urban Area (2026-11-01); York Region, Regional Official Plan 2022, Map 1 – Regional Structure: Towns and Villages (2026-11-01). York Regional Council highlights, Dec 11, 2025: 2025 Servicing Capacity Assignment (2025-12-11).
Neighbourhood profile (2021 Census)
- Population (2021)
- 350,698
- Median age
- 42.9
- Median household income (2020)
- $111,700
- Owner households
- 84%
- Households with children
- 48%
Source: Statistics Canada, Census of Population 2021, Census Profile (dissemination areas) (2021-05-11). 339 dissemination areas; medians and shares averaged by population.
