How much you get
Local financing note for Whitby
Whitby homes sit in Elexicon Energy territory, and Durham Greener Homes runs on top of the provincial program here — it isn't available everywhere in Ontario. Durham Greener Homes adds a Deep Retrofit Rebate of up to $10,000, loan financing through local credit unions, and an extra $5,000 incentive specific to Whitby residents, plus a free energy coach to help sequence the work. Check whether this upgrade counts toward the Deep Retrofit Rebate before assuming the provincial number is all you'll get.
No assessment needed: attic & cathedral ceiling
Attic, from ≤R-12
Attic, from R-12–25
Attic, from R-25–35
Cathedral ceiling / flat roof
Assessment required: walls, foundation, crawlspace
Exterior wall
Foundation / basement wall
Basement slab
Foundation header
Crawlspace wall
Crawlspace ceiling
Exposed floor
The attic pays more here than on the no-assessment path
If you're already booking an assessment for other upgrades, do attic insulation through this tier instead, up to $1,500 (vs. $1,250) and $780 for cathedral ceiling (vs. $750).
How to claim it
- For attic: confirm eligibility, pick a participating contractor, get it installed, contractor submits the application
- For walls/foundation: book an energy assessment first, then follow the assessment-path steps
Browse HVAC, solar, and electrical installers near Whitby →
Common questions
What insulation rebates are available in Whitby?
The provincial rebate tiers apply here the same as elsewhere in Ontario, but Whitby homeowners doing a larger insulation project should check whether it qualifies for Durham Greener Homes' Deep Retrofit Rebate (up to $10,000) and the extra $5,000 incentive specific to Whitby residents — those stack on top of the provincial numbers on this page.
Do I need an energy audit first in Whitby?
Yes for wall, foundation, and crawlspace work under the provincial program. Durham Greener Homes' energy coaching is a separate, free service that can help plan the sequence of a bigger retrofit alongside that required audit.
Elexicon Energy: a newer name behind Whitby's power bill
Elexicon Energy was formed a few years back when Whitby Hydro merged with the utilities serving Oshawa, Ajax, and other parts of Durham Region, so if the name feels less familiar than "Whitby Hydro" used to, that's why. For insulation specifically, it barely matters which utility issues your bill: the rebate tiers on this page are set by the province, and insulation work doesn't add electrical load the way a heat pump or EV charger does. The genuinely useful Whitby-specific stacking opportunity isn't from Elexicon at all, it's the Durham Greener Homes program mentioned below, which is municipal, not utility-run.
Lake Ontario keeps Whitby's winters milder, but the math still favours insulation
Sitting on Lake Ontario moderates Whitby's cold somewhat compared to inland Durham towns, with a 10-year (2015-2024) average January low of -7.6°C and a coldest night of -28.3°C. That's less extreme than the northern cities on this site, but it's still five-plus months a year where an under-insulated attic or wall is bleeding heat you paid to generate. Combined with the Durham Greener Homes stacking option below, Whitby homeowners doing a larger insulation project often have more total rebate available than the base provincial numbers suggest, worth factoring into how fast the upgrade pays for itself.
Next steps
View all Whitby rebate programs → or check the official Home Renovation Savings Program site → for the current source of truth.