What Home Renovation Savings pays for insulation in Guelph
We re-read the program's pages and both eligibility documents on October 3, 2026. There are two ways in: an attic-only stream with no assessment, and the assessment stream, where insulation, windows, air sealing and a heat pump water heater are bundled.
Attic, no assessment
The attic stream pays half of the after-tax cost, up to $1,250 for an attic from R-12 or less to R-50, $1,000 from R-25 or less and $800 from R-35 or less. A participating insulation contractor must do the work.
Attic, with assessment
In the assessment stream an attic brought to at least R-50 pays $1,500, $1,200 or $900 by starting R-value, pro-rated by the share of the roof you insulate (minimum 50%).
Cathedral ceiling or flat roof
$750 in the attic stream and $780 in the assessment stream. Any combination of attic, cathedral and flat roof counts as one measure, capped at $1,500 in the assessment stream.
Exterior walls
$1,200 for R-7.5 to R-12 added, $2,100 for more than R-12 to R-20 and $3,600 for more than R-20. Minimum 20% of wall area, pro-rated.
Basement walls, slab and headers
Walls up to $1,500, a slab $500 and a header $300. Wall plus slab is capped at $2,000, and all three at $2,300.
Crawl space and exposed floors
Crawl space walls $600 or $1,200, ceiling $1,200, header $300, combined up to $2,700. An exposed floor over a garage earns $300 at R-20 or more.
Semis and row homes
Semi-detached and end-unit row homes get 75% of the walls and basement maximums. Middle-unit rows get 50%.
Audit rebate and cap
The assessment stream returns $600 for the audits and caps insulation rebates at $7,700, inside an overall $10,000 limit, or $5,000 for Enbridge gas homes.
Attic stream work must be finished by November 30, 2026 and entered in the system by December 31. In the assessment stream, the post-audit must be scheduled by November 30 and completed by December 31, 2026, or within 180 days of your first assessment.
Guelph's housing mix
The 2021 Census counts 49% of households in detached houses, 69% in an eligible type, 66% owning and 4.7% reporting a home needing major repairs. Tall apartment buildings account for 12% and low-rise buildings 14%, none of which are eligible.
Choose by what your attic has
The attic rebate has three tiers by starting R-value: $1,500, $1,200 or $900 in the assessment stream and $1,250, $1,000 or $800 in the attic stream. If your house is the typical mid-century build, find out where it falls before you choose a stream, since the difference between the top and bottom tier is $600.
Alectra is not the program
Guelph's electric utility is Alectra Utilities, which took over Guelph Hydro. Alectra does not run the insulation rebates. Ask Alectra whether it has any conservation offers and ask your advisor whether they can be combined.
A realistic bundle
An older Guelph house might do the attic ($1,200 or less), basement walls and a slab, and air sealing. Three measures earn the $500 bonus on top. Air sealing needs the home to reach a target set in your upgrade report, so the program suggests doing it last.
How to claim in Guelph
- Confirm your heating fuel and the age of the house.
- Choose a stream: pre-register for the attic stream, or book a home energy assessment for the full bundle.
- Get quotes that state the R-value you start with, the R-value you reach and the share of each surface you will insulate.
- Do not start any work until the in-home visit or first assessment has happened.
- Keep invoices and your property tax bill for the paperwork, and finish before the November 30 and December 31, 2026 dates.
Common questions
Who supplies electricity in Guelph?
Alectra Utilities.
What is the spread between attic tiers?
$600 in the assessment stream.
What is the three-upgrade bonus?
$500.
Are tall apartments covered?
No.
What to do next
See Guelph window and door rebates and the Ontario rebate calculator.
By Sam Menard. Sources, last read October 3, 2026: Home Renovation Savings: assessment upgrades, Home Renovation Savings: attic insulation, Home Renovation Savings eligibility requirements (PDF), Attic stream requirements (PDF), Statistics Canada 2021 Census, table 98-10-0233-01. All Guelph rebates → Every Home Renovation Savings rebate →
