Ontario · 16 local services · checked September 28, 2026

Home energy audits and home testing in Markham

Markham gets about 3,863 heating degree-days a year, 3% of its houses were built before 1961, and 28 NRCan-licensed service organizations list its postal codes. Pick a service for the local details.

Energy audits in Markham → All 16 services
A Victorian red-brick semi-detached house with a front porch in autumn

How Markham is built

Markham's houses by when they were built Ten house shapes, one for each tenth of Markham's 91,305 houses. Before 1961: 3%, 1961–1990: 38%, 1991–2000: 17%, 2001 or later: 43%. Older houses glow hotter.
  • Before 1961 3%
  • 1961–1990 38%
  • 1991–2000 17%
  • 2001 or later 43%
Each house stands for one in ten of Markham's 91,305 houses (single-detached, semi-detached, row and duplex), drawn by when it was built. The glow shows the usual pattern: older houses tend to be leakier and less insulated. Snowfall scales with heating degree-days. Sources: Statistics Canada 2021 Census (table 98-10-0233-01), NRCan HOT2000 climate data.

Markham at a glance

Climate

Markham gets about 3,863 heating degree-days a year and has a winter design temperature of −19.8°C, according to NRCan's HOT2000 climate data for Toronto Buttonville.

Housing

Of Markham's 91,305 houses (single-detached, semi-detached, row houses and duplexes), 3% were built before 1961 and 40% before 1991, according to the 2021 Census. The typical house dates from 1996–2000.

Heating

In the Toronto area, 59% of households heat mainly with a forced-air furnace, 8% with a boiler and radiators, 5% with electric baseboards and 4% with a heat pump; natural gas is the main heating energy for 52% of households and electricity for 18% (Statistics Canada, 2023).

Radon

In Health Canada's 2012 survey, none of the 95 homes tested in the York Regional Health Unit health region were above the guideline, a small sample that doesn't rule radon out. The larger 2024 Cross-Canada survey reports 4.5% (1 in 22) of houses at or above the guideline for Toronto Metro Area (Toronto CMA).

Local service guides for Markham

Energy audits and tests

An energy advisor’s kit on a front-hall bench: infrared camera, pressure gauge with tubing, tape measure, headlamp and a floor sketch

Home energy audit

28 licensed organizations
A red blower-door panel with a large fan fitted into the front doorway of a brick bungalow, a pressure gauge on a stool inside

Blower door test

3,863 degree-days
Hands holding an infrared camera aimed at a ceiling corner beside a frosty window; the screen shows a cold streak

Thermal imaging inspection

3,863 degree-days
A kitchen table with a house floor plan, a laser measure, a tape measure and a laptop showing the plan

Heat loss calculation

Design temp −19.8°C
A duct-testing fan on a basement floor connected by flexible duct to a furnace, a pressure gauge hanging from a joist

Duct leakage testing

59% forced-air
A gloved hand inserting a combustion analyzer probe into a furnace flue pipe in a basement

Combustion safety test

52% heat with gas
A heat recovery ventilator on a basement wall with four insulated ducts running up between the joists

Ventilation and humidity assessment

43% built since 2001
Loose-fill insulation between attic joists, a yellow ruler showing its depth and frost on the roofing nails above

Attic insulation inspection

40% built before 1991
Utility bills and a phone showing a monthly energy-use chart on a kitchen table

Energy bill analysis

Alectra Utilities

Home health tests

A small digital radon monitor on a bookshelf in a finished basement family room

Radon testing

4.5% at or above guideline (2024)
A carbon monoxide alarm on an upstairs hallway wall outside the bedrooms at night

Carbon monoxide testing

Required by law
A moisture meter pressed into water-stained basement drywall, an air-sampling pump on a tripod nearby

Mold and air quality testing

40% built before 1991
A gloved hand holding a sealed sample bag above vermiculite insulation between attic joists

Asbestos and vermiculite testing

40% built before 1991
A gloved hand swabbing layers of cracked old paint on a wooden window sill

Lead paint testing

3% built before 1961
Filling a water-sample bottle at a farmhouse kitchen tap with the aerator removed, snowy fields and a barn outside

Well water testing

Wells in some areas

For businesses and buildings

An auditor walking between rooftop heating and cooling units on a snowy commercial roof

Commercial energy audit

5 incentive programs

Who does energy evaluations in Markham

28 NRCan-licensed service organizations list Markham postal codes. See the list with phone numbers and coverage →

Ontario directory: verified advisor profiles for York Region, with prices where published.

City programs in Markham

MyHEAT Thermal Map (Enbridge Gas)

Free aerial rooftop heat-loss map and rating for residential homes. Burlington's City page says Enbridge Gas and MyHEAT mapped Burlington, Vaughan, Richmond Hill and Markham. Markham itself has no City rebate or loan; Markham and Richmond Hill are studying a future home energy retrofit program.

Rebates and financing for Markham homes

Provincial · needs an evaluation Home Renovation Savings — Home Energy Assessment path Up to $10,000 per home for insulation, windows and air sealing, plus $600 back on your assessments — if the follow-up assessment is done by December 31, 2026 Open · deadline Provincial Home Renovation Savings — direct rebates (no assessment) Heat pumps up to $7,500 ($12,000 ground-source), solar with battery up to $10,000, plus attic, thermostat and appliance rebates — no assessment needed Open Federal CMHC Eco Improvement premium refund 25% back on your CMHC mortgage insurance premium after $20,000 of energy renovations Open

Cities near Markham

Richmond Hill10 kmPickering15 kmVaughan18 kmToronto19 kmAjax22 kmWhitby28 km All 70 cities →

Sources

Checked September 28, 2026.

Planning upgrades in Markham?

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Email us what you’re planning, your postal code and the type of building (a house, a duplex or triplex, or a larger multi-unit building) — we’ll reply with registered service organizations for your area and which rebates apply.

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