Attic & Spray Foam Insulation Contractors in Ottawa

This guide compares 13 insulation contractors serving Ottawa with contact details, service areas, and public review history. 13 carry a sourced public rating, averaging 4.6 stars; the highest-rated is Ottawa Insulations at 5.0 stars from 342 Google reviews.

Insulation contractors in Ottawa usually start in the attic because it is easy to reach, though Natural Resources Canada notes that basements and uninsulated walls lose more heat than a typical attic. Seal the air leaks first, then add insulation. Ontario's Home Renovation Savings program offers a rebate on attic insulation without a home energy assessment. The contractors below insulate attics, walls and basements across Ottawa.

13 companies compared13 rated on Google4.6 avg ratingLast reviewed October 2026

Also covers: Attic insulation · Spray foam insulation · Blown-in insulation · Basement insulation · Wall insulation · Insulation removal · Air sealing

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  1. Ottawa Insulations

    5.0(342)on GoogleChecked Oct 2026Insulation

    Ottawa Insulations is an insulation contractor in Ottawa. Rated 5 from 342 Google reviews.

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  2. Strukt Solutions

    5.0(176)on GoogleChecked Oct 2026Insulation

    Strukt Solutions is an insulation contractor in Ottawa. Rated 5 from 176 Google reviews.

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  3. Panda Insulation

    4.9(231)on GoogleChecked Oct 2026Insulation

    Panda Insulation is an insulation contractor in Ottawa. Rated 4.9 from 231 Google reviews.

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  5. O'Reilly Brothers Ltd

    Nepean

    4.9(133)on GoogleChecked Oct 2026Insulation

    O'Reilly Brothers Ltd is an insulation contractor in Nepean, Ottawa. Rated 4.9 from 133 Google reviews.

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  6. Stewart Roofing Ltd.

    Nepean

    4.8(116)on GoogleChecked Oct 2026Insulation

    Stewart Roofing Ltd. is an insulation contractor in Nepean, Ottawa offering roofing. Rated 4.8 from 116 Google reviews.

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  7. Kovar Contracting INC.

    4.8(83)on GoogleChecked Oct 2026Insulation

    Kovar Contracting INC. is an insulation contractor in Ottawa offering bathroom renovation, heating and cooling and kitchen renovation. Rated 4.8 from 83 Google reviews.

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  8. Veritas Insulation & Home Performance

    Nepean

    5.0(28)on GoogleChecked Oct 2026Insulation

    Veritas Insulation & Home Performance is an insulation contractor in Nepean, Ottawa. Rated 5 from 28 Google reviews.

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  9. Great Northern Insulation

    Nepean

    4.7(411)on GoogleChecked Oct 2026Insulation

    Great Northern Insulation is an insulation contractor in Nepean, Ottawa. Rated 4.7 from 411 Google reviews.

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  12. INSO-TEC Inc.

    3.9(30)on GoogleChecked Oct 2026Insulation

    INSO-TEC Inc. is an insulation contractor in Ottawa. Rated 3.9 from 30 Google reviews.

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  13. Comfort Insulation

    Nepean

    3.4(18)on GoogleChecked Oct 2026Insulation

    Comfort Insulation is an insulation contractor in Nepean, Ottawa. Rated 3.4 from 18 Google reviews.

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Attics, walls and basements

Why air sealing comes before insulation in an Ottawa attic

Natural Resources Canada's Keeping the Heat In guide puts air sealing ahead of insulation in the attic, and is wary of adding ventilation as a fix. Ontario's Home Renovation Savings program covers attic insulation as a single upgrade.

Why the attic is first, and when it should not be

Easy access has made the attic the favourite place for homeowners to start. Natural Resources Canada also notes that basements and uninsulated walls lose more heat than the typical attic, so in an older house with a bare basement the attic is not always the biggest saving.

Air sealing comes before insulation

It is essential to air seal the attic so moist indoor air cannot get in. Mould or rot in an attic is a sign of advanced condensation, and the cause is corrected before any insulation is added. Wet insulation is not covered until the moisture source is gone and it has dried.

Ice dams have the same cure. Natural Resources Canada's advice is to seal all attic air leaks and insulate thoroughly.

If an ice dam has already damaged shingles or flashing, start with Ottawa roofing companies before the attic work.

What to check before work starts

  1. The insulation already there: its type, condition, average depth and coverage, which give its insulating value.
  2. Vermiculite. Natural Resources Canada and Health Canada both say not to disturb it, because it may contain asbestos.
  3. Ventilation. It is the second line of defence after air sealing. Do not increase it automatically, and do not use electric exhaust fans in the attic, which can pull house air into it.
  4. The rebate. Home Renovation Savings, from Save on Energy and Enbridge Gas, lists attic insulation as a single upgrade with no home energy assessment, for homes heated by electricity, natural gas, oil, propane or wood, subject to its terms.

Sources, checked 2026-10-21:

Buyer guide

Hiring an insulation contractor in Ottawa

What separates a great insulation contractor from a cheap quote, and the questions worth asking before you sign.

  • Air seal before you insulate

    Natural Resources Canada calls it essential to air seal the attic so moist indoor air cannot get in. Leaks around hatches and ceiling openings carry warm, damp air into the attic, and its advice for ice dams is the same: seal every attic air leak and insulate thoroughly.

  • Have the old insulation checked first

    Natural Resources Canada asks for the existing insulation's type, condition and depth before anything is added, and says wet insulation is not covered until it is dry. Vermiculite is the exception to adding on top: Health Canada says not to disturb it or remove it yourself.

  • More vents is not the fix

    Natural Resources Canada calls ventilation the second line of defence after air sealing, warns against increasing it automatically, and advises against electric exhaust fans in the attic, which can pull house air up into it.

  • Ask about the rebate before you sign

    Home Renovation Savings, delivered by Save on Energy and Enbridge Gas, offers rebates on single upgrades such as attic insulation with no home energy assessment, and larger rebates on bundled upgrades. Terms apply, so ask whether the contractor handles the claim.

Before you hire

What should you check before hiring an insulation contractor in Ottawa?

Home Renovation Savings, delivered by Save on Energy and Enbridge Gas, publishes which insulation upgrades qualify for a rebate and on what terms, which is worth reading before a contractor quotes the job. Ottawa Service Directory is a listings site, not a regulator: we publish what a business reports about itself, so confirm what applies to your job with the source below and with the business before work starts.

Source: Save on Energy: Home Renovation Savings program. Checked 2026-08-24. Rules and thresholds change, so confirm before work starts.

Common questions

Insulation in Ottawa, answered

Is there a rebate for attic insulation in Ontario?
Yes. Home Renovation Savings, delivered by Save on Energy and Enbridge Gas with support from the Ontario government, lists attic insulation as a single upgrade you can claim without a home energy assessment. Homes heated by electricity, natural gas, oil, propane or wood can apply, subject to the program's terms. Check the current amount on the program's site before you book.
How much insulation should be in my attic?
Natural Resources Canada's method is to measure the depth of what is there, work out its insulating value, and compare it with the level its Keeping the Heat In guide recommends. Ask the contractor to measure on site and state the R-value before and after in writing.
Should I insulate the attic or the basement first?
The attic is the usual starting point because it is easy to reach. Natural Resources Canada points out that basements and uninsulated walls lose more heat than a typical attic, so in an older Ottawa house with a bare basement the basement may be the bigger saving. An energy assessment tells you which.
Is old attic insulation dangerous?
Vermiculite can be. Health Canada says not to disturb vermiculite insulation or try to remove it yourself, because it may contain asbestos. Have it tested before anyone works in that attic.

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