Second units and garden suites
86% of the 109 residential lots on Henderson Ave screen as likely to allow a garden suite; 86% a second unit in the house.
Residential lots by second-units screen| Likely allows additional units | 0 | 0% |
|---|
| Likely, with constraints | 107 | 98% |
|---|
| Check zoning / further investigation | 2 | 2% |
|---|
| Unlikely | 0 | 0% |
|---|
- Garden suite likely: 94 lots (86%).
- Third unit likely: 94 lots (86%).
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 2026-11-02.
Lot sizes
Median lot 704 m² (7,578 sq ft); half of the lots are between 600 m² and 850 m² (109 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): 13 lots (12%).
- In the Oak Ridges Moraine countryside, natural core or linkage areas: 0 lots (0%).
- In the Greenbelt's protected countryside or urban river valleys: 0 lots (0%).
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
9 active applications (rezonings, site plans, subdivisions, minor variances, consents) near Henderson Ave.
- 148 Steeles Avenue East, 4 Henderson Avenue · Zoning By-law Amendment · In Progress · Regional review: Intake, Cursory Evaluation · 2026-05-07 · 26.117562.000.00.PLAN (York Region file ZBA.26.M.0047)
- Address not published · Local Official Plan Amendment (Approval) · In Progress · Regional review: Intake, Geo-Referencing · 2025-01-02 · 24.197840.000.00.PLAN (York Region file LOPA.25.M.0001)
- 155 Henderson Avenue, 151 Henderson Avenue · Zoning By-law Amendment · In Progress · Regional review: Intake, Cursory Evaluation · 2025-01-02 · 24.197840.000.00.PLAN (York Region file ZBA.25.M.0002)
- 151 & 155 Henderson Avenue · Zoning By-law Amendment · In Progress · Regional review: Review, Awaiting Response · 2023-09-25 · 23.120286.000.00.PLAN (York Region file ZBA.23.M.0094)
- 157 Henderson Avenue · Zoning By-law Amendment · In Progress · Regional review: Approvals, Awaiting Approval · 2022-02-03 · PLAN 21 145538 (York Region file ZBA.22.M.0018)
Source: York Region, Active Development Application Boundaries (York Region's review of applications in its nine municipalities) (2026-10-27). Within 150 m of the street's lots.
Building permits, last 12 months
Markham does not publish building permits as open data that we can show.
Upcoming residential projects
3 proposed, approved or under-construction projects with about 10 units published.
- 157 Henderson Avenue · Proposed: residential development (units not published)
- 148 Steeles Avenue East, 4 Henderson Avenue · Proposed: townhouse development (units not published)
- 155 Henderson Avenue, 151 Henderson Avenue · Proposed: 10-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). Within 300 m of the street's lots.
Rapid transit within 800 m
No subway, GO, LRT or rapid bus station within 800 m.
Source: TTC, Metrolinx and York Region Transit, Rapid transit stations (the map's transit layer) (2026-10-31).
Everyday needs
Everyday Needs score 73/100 · walking 58 · driving 87 (average over 109 residential lots)
- 32% of lots within a 10-minute walk of a grocery store
- 43% of lots within a 10-minute walk of a transit stop
Nearest from the middle of Henderson Ave:
- Grocery store: 12 min walk (Tavazo Dried Nuts & Fruits) · 3 min by car
- Pharmacy: 20 min walk (Pharmasave) · 4 min by car
- Transit stop: 11 min walk (Yonge St. @ Clark Ave. E. (GO))
- Shopping centre: 16 min walk (Shops on Yonge) · 3 min by car
- Emergency department: over 60 min walk · 21 min by car (North York General Hospital)
- Hospital: 21 min walk (Shouldice Hospital) · 5 min by car
Source: LSG Realty, Everyday Needs score (LSG's own travel-time estimate) (2026-11-02); © OpenStreetMap contributors, ODbL, OpenStreetMap (Geofabrik Ontario extract): roads, footpaths, supermarkets and grocery stores, pharmacies, shopping centres and department stores, hospitals and emergency departments — Open Database Licence (ODbL) 1.0 (2026-11-02); Ontario Ministry of Health, Ministry of Health Service Provider Locations (MOHSERLO): hospital sites — Open Government Licence – Ontario (2026-11-02); City of Toronto (TTC), Merged GTFS – TTC Routes and Schedules (stops) — Open Government Licence – Toronto (2026-11-02); Metrolinx (GO Transit), GO Transit GTFS (stops) — Metrolinx Open Data Licence (2026-11-02); Metrolinx (UP Express), UP Express GTFS (stops) — Metrolinx Open Data Licence (2026-11-02). LSG estimate from open data: walking on mapped streets and paths at 4.8 km/h; driving at typical weekday rush-hour road speeds (not live traffic). Times are for the 200 m square around each address. Places can open, close or move; check before you rely on one. Places and paths © OpenStreetMap contributors, ODbL.
Public schools
- Henderson Avenue Public School · Elementary · York Region DSB · 20 m
- E J Sand Public School · Elementary · York Region DSB · 90 m
- Brebeuf College School · Secondary · Toronto CDSB · 300 m
- St Agnes Catholic School · Elementary · Toronto CDSB · 410 m
- Lillian Public School · Elementary · Toronto DSB · 480 m
- Thornhill Secondary School · Secondary · York Region DSB · 580 m
- Woodland Public School · Elementary · York Region DSB · 610 m
YRDSB school locator (York Region District School Board)TCDSB school locator (Toronto Catholic District School Board)TDSB school locator (Toronto 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)
- 7,365
- Median age
- 44.6
- Median household income (2020)
- $96,700
- Owner households
- 71%
- Households with children
- 39%
Source: Statistics Canada, Census of Population 2021, Census Profile (dissemination areas) (2021-05-11). 9 dissemination areas; medians and shares averaged by population.
