How much you 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
Route the attic through the assessment tier if you're already booking one
Attic and cathedral-ceiling insulation don't require an assessment on their own (up to $1,250 / $750), but the same work pays more, $1,500 attic, $780 cathedral ceiling, if it's bundled into an assessment you're already booking for wall or foundation insulation.
What's different about doing this in Greater Sudbury
Greater Sudbury Hydro serves electricity here and Enbridge Gas serves heat, and there's no live municipal retrofit-financing program yet, the City received a $170,000 grant to study financing models, but as of this page's last check nothing has launched. Colder average winters than southern Ontario also mean the assessment-required tier (which covers exterior wall and foundation insulation, the parts of a house that lose the most heat in a Sudbury winter) is where most of the real savings show up, not just the attic top-up.
How to claim it
- Attic/cathedral ceiling: pick a participating contractor, complete the install, contractor handles the application, no assessment needed.
- Wall/foundation/crawlspace: an assessor visits first, you complete the work, then a follow-up assessment confirms it.
Browse HVAC, solar, and electrical installers near Greater Sudbury →
Common questions
What insulation rebates are available in Greater Sudbury?
The same provincial HRSP amounts as everywhere in Ontario: up to $1,250 for attic top-ups with no assessment, and up to $3,600 for exterior walls plus smaller foundation/crawlspace amounts once you've booked an assessment. Greater Sudbury's own retrofit-financing study (funded by a $170,000 grant) hasn't produced a live local program yet, so there's no city top-up to add on.
Do I need an energy audit first in Greater Sudbury?
Only for the wall, foundation, and crawlspace tier, attic and cathedral-ceiling insulation can be done through a participating contractor without one. Given Greater Sudbury's colder winters, an assessor will often flag attic top-ups even if you only booked for wall insulation, so it's worth asking about while they're on site.
Greater Sudbury Hydro won't touch your rebate, but call them anyway
The province, not Greater Sudbury Hydro, decides what your insulation rebate is worth, so nothing on your electricity bill changes what you qualify for. Where the utility does matter is upstream of the paperwork: if an assessor recommends bundling in air sealing or a ventilation upgrade alongside the wall or attic work, and that pushes your home's electrical load higher, Greater Sudbury Hydro is the outfit that signs off on service capacity before an installer can proceed. It's a five-minute call worth making before you book anything, and it's also worth asking whether they've added any incentive of their own on top of the provincial numbers since this was last checked.
Why -35.9°C makes insulation math different here than almost anywhere else in Ontario
Most Ontario cities argue their insulation rebate over a few degrees of difference. Greater Sudbury isn't in that conversation, a decade of records (2015-2024) puts its average January low at -15.2°C, roughly six to nine degrees colder than the cities further south this rebate program also covers, and its coldest recorded night hit -35.9°C. Heat loss through an under-insulated attic or wall scales with that temperature gap between inside and outside air, so the same gap in your insulation that costs a Toronto homeowner a modest amount over a winter costs a Greater Sudbury homeowner substantially more, night after night, for months. That's the actual reason the payback clock runs faster here than the provincial average this program was built around.
Next steps
View all Greater Sudbury rebate programs → or check the official Home Renovation Savings Program site → for the current source of truth.