Ontario · area guide · 21 communities · checked October 8, 2026
Home energy audits, radon and well water testing in York Region
The six towns and townships on this page are home to 309,475 people (2021 Census), and 11% of their houses were built before 1961. This guide covers 21 communities, from Newmarket, Aurora, Stouffville, Georgina and King to the smallest hamlets, with the local numbers that shape an energy audit or a home health test.
Population (2021)
309,475
Communities listed
21
Houses built before 1961
11%
Heating degree-days
4,243
King Smoke Tree
How York Region is built
- Before 1961 11%
- 1961–1990 34%
- 1991–2000 15%
- 2001 or later 40%
This page covers the York Region towns and townships we don't have separate city pages for: King, East Gwillimbury, Georgina, Whitchurch-Stouffville, Newmarket and Aurora. Vaughan, Markham and Richmond Hill have their own pages, which also cover their hamlets.
Six local guides for York Region
Energy audits and heat pump sizing
York Region at a glance
People and homes
309,475 people and 111,229 private dwellings in 2021, up 10.8% in population since 2016.
Housing
Of the 96,970 houses in York Region (single-detached, semi-detached, row houses, duplexes and mobile homes), 11% were built before 1961 and 45% before 1991, according to the 2021 Census. The typical house dates from 1991–1995.
Climate
Environment and Climate Change Canada's 1981–2010 climate normal at King Smoke Tree (11.9 km from the middle of the area) is 4,243 heating degree-days a year, with a January mean of −7.4°C. The building code's 2.5% January design temperatures for the area run from −20°C to −22°C.
Radon
In Health Canada’s 2012 survey, none of the 95 homes tested in the York Regional Health Unit were above the guideline, a small sample that doesn't rule radon out. The larger 2024 Cross-Canada survey reports 12.4% (1 in 8) of homes at or above the guideline for Ontario as a whole.
Wells
Free bacteria testing for owners of private drinking-water wells, analyzed by Public Health Ontario for total coliforms and E. coli. Pick up bottles weekdays from 8:30 a.m. to 4:30 p.m. and drop samples off Monday to Thursday before each site's cut-off: in Georgina at 20849 Dalton Road, Sutton (10 a.m.), 24262 Woodbine Avenue, Keswick (11 a.m.) and the Georgina Civic Centre, 26557 Civic Centre Road (10 a.m.); in Newmarket at 17150 Yonge Street (10 a.m.); in Richmond Hill at 50 High Tech Road (11 a.m.); in Vaughan at 9060 Jane Street (11 a.m.); and in Unionville at 4261 Highway 7 (11 a.m.). The Public Health Ontario lab at 81 Resources Road in Etobicoke takes drop-offs only, weekdays 8 a.m. to 2 p.m.
Energy advisors
NRCan's list (checked October 8, 2026) shows 27 service organizations registered for postal codes in Newmarket, Aurora, Stouffville, Keswick, Holland Landing and King City. Confirm they travel to your community.
Heating
Province-wide, 58% of Ontario households heat mainly with natural gas, 18% with electricity, 4% with propane and 1% each with oil and wood (Statistics Canada, 2023); there's no published breakdown for this area alone.
Every community in York Region
Grouped by municipality, with 2021 Census populations. Names come from Natural Resources Canada's geographical names database and Statistics Canada's population centres.
- Town of Newmarket 87,942
- Town of Aurora 62,057
- Town of Whitchurch-Stouffville 49,864Ballantrae, Gormley, Stouffville
- Town of Georgina 47,642Elmhurst Beach, Jacksons Point, Keswick, Pefferlaw, Sutton
- Town of East Gwillimbury 34,637Holland Landing, Mount Albert, Queensville, River Drive Park
- Township of King 27,333King City, Nobleton, Schomberg
Covered on city pages
- Vaughan 323,103Vaughan's page covers Kleinburg, Maple, Concord and Woodbridge.
- Markham 338,503Markham's page covers Unionville and Locust Hill.
- Richmond Hill 202,022Richmond Hill has its own pages.
Who does the work in York Region
- Energy evaluations and heat loss calculations: NRCan's list (checked October 8, 2026) shows 27 registered service organizations for postal codes in Newmarket, Aurora, Stouffville, Keswick, Holland Landing, King City. See them with phone numbers; confirm they travel to your community.
- Radon: certified measurement and mitigation professionals are listed in the C-NRPP directory ↗.
- Wood stoves and chimneys: WETT-certified professionals are listed in the WETT directory ↗; see wood-burning inspections in York Region.
- Well water: free bacteria tests through the local public health unit; chemistry through a licensed private lab. Details for York Region.
Rebates and financing for York Region homes
Nearby city pages and guides
Sources
- Statistics Canada — 2021 Census population and dwelling counts (table 98-10-0002-01)
- Statistics Canada — 2021 Census, households by period of construction and dwelling type (table 98-10-0233-01)
- Statistics Canada — 2021 Census population centres (table 98-10-0011-01)
- NRCan — Canadian Geographical Names Database (official place names)
- Environment and Climate Change Canada — Canadian Climate Normals 1981–2010
- National Research Council — National Building Code of Canada 2020, Appendix C, Table C-2 (climatic design data)
- Health Canada — Cross-Canada Survey of Radon Concentrations in Homes, final report (2012), Table 5
- NRCan — Service organizations for existing homes (list checked October 8, 2026)
- Land Information Ontario — municipal boundaries (lower and single tier)
- Evict Radon National Study with Health Canada — 2024 Cross-Canada Survey of Radon Exposure (report v1.1)
- York Region Public Health — private well water testing
- Statistics Canada — Households and the Environment Survey 2023, primary heating systems (table 38-10-0286-01)
Planning upgrades in York Region?
Tell us where you are and what you’re planning. We’ll connect you with a registered service organization for your area — no spam, no shared lead lists.