What Home Renovation Savings pays for insulation in London
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.
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- Up to $10,000
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- $2,000
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Read everything we know so far Official page: canada.ca
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.
London's older stock
The 2021 Census counts 52% of London households in homes built before 1981. 49% live in detached houses, 66% in an eligible house type and 58% own, a lower owner rate than most Ontario cities. 5.5% report needing major repairs. Low-rise apartments account for 10% and tall buildings 21%, none of which the program covers.
Start with the attic
The attic pays the most per dollar of work. From R-12 or less to R-50 it earns up to $1,250 in the attic stream (half the after-tax cost, capped) or up to $1,500 in the assessment stream. Both need a participating or professional contractor and a written R-value before and after. If your attic already has R-25 to R-35, the figures drop to $800 and $900.
Cathedral ceilings and flat roofs
Some London bungalows and additions have a cathedral ceiling or flat roof. These pay $750 in the attic stream (R-12 or less to R-20, or up to R-25 to R-28) and $780 in the assessment stream. Any combination of roof types counts as one measure. If the house has an attic and a flat-roofed addition, the rebate for the whole roof is capped at $1,500 in the assessment stream.
Crawl spaces under additions
Crawl space walls pay $600 for R-10 to R-22 and $1,200 above R-22, and a crawl space ceiling pays $1,200 above R-24. Basement and crawl space wall rebates share a $1,500 ceiling when both exist. The crawl space combinations top out at $2,700. A crawl space is rarely the first job, but it can complete a bundle.
How to claim in London
- Confirm the house is an eligible type and find the attic's current R-value.
- 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
Does London have many older homes?
52% of households live in homes built before 1981.
How much does a flat roof pay?
$750 in the attic stream and $780 in the assessment stream.
Can I combine basement and crawl space rebates?
Yes, up to a combined $1,500 for the walls.
Do renters qualify?
No. The owner must apply.
What to do next
See London 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 London rebates → Every Home Renovation Savings rebate →
