How to Hire an Insulation Contractor in Ontario (2026): The Questions, the CUFCA Card for Spray Foam, WSIB and Insurance, References, Deposits and the Rebate Participating List

Insulation & Air Sealing

Hiring an Insulation Contractor: You Are Buying Two Hours of Care You Will Never See, So Pick the Man, Not the Price

Insulation is the only trade where the finished job looks the same whether it was done right or done at a run. A blown attic at R-60 and one at R-38 with the corners missed are both a white field of fluff from the hatch. Spray foam at 2 in. and at 1.25 in. are both yellow and both say “closed cell” on the invoice. So the hiring decision carries more weight than in a trade you can look at afterward. Here is how I sort them, what paperwork a foam crew must have before a hose comes off the truck, and the one list that decides whether the attic rebate is real for you.

Ontario, checked October 2026. I build ICF houses and hire spray foam and blown insulation subs for the parts of a house that ICF does not cover; this is what I ask them, and what you should.

What you are actually hiring

The product is not the insulation. Cellulose is cellulose and 2 lb foam is 2 lb foam. What you are buying is the care of the two people in your attic for a morning: whether they dam around the hatch, box the non-IC pot lights, keep the insulation 3 in. clear of the chimney, push baffles into every rafter bay before the blower starts, and leave depth cards. None of that is on the quote. All of it is in whether the company has a foreman who checks.

A batt in a leaky wall is a wool sweater in the wind. Fibrous insulation does not stop air any more than the sweater does, so the contractor who sells R-60 without a line for air sealing has sold you the sweater and left the window open. The first sorting question is whether they talk about air sealing before you do.

The ten questions

  1. What is the existing R, and how did you measure it? A number from a ruler in the attic, not a glance from the hatch. If they did not go up, they are guessing at the biggest line on the quote.
  2. What product, what brand, what settled depth, how many bags? Bag count against the coverage chart on the bag is the only honest R check; a 1,200 sq ft attic from R-20 to R-60 in cellulose is roughly 70 to 100 bags depending on the bag. Ask for the number on the quote and the empties on the lawn.
  3. Is air sealing a separate line, and what is on it? Top plates, plumbing stacks, wire holes, duct boots, pot light covers, the hatch gasket. $0.75 to $1.50 a square foot, $600 minimum. “Included” with no list means not done.
  4. What happens at the pot lights, the chimney and the bathroom fans? Non-IC lights get a $45 airtight cover or a new IC fixture. The chimney keeps 3 in. of clearance behind a metal dam. The fans go out through the roof or the wall, not into the fluff.
  5. Did you look for vermiculite and knob-and-tube? The right answer to either is “we stop”. Vermiculite is left alone until a lab test says what it is, and nobody blows anything over it. Insulation is never placed over or against knob-and-tube wiring. A contractor who shrugs at either has told you everything.
  6. Who is in the attic, and how long have they been with you? Five years with the same two installers means a foreman. Hiring for the season means a van.
  7. What do I get on paper when you leave? Depth cards visible from the hatch, a bag count, photographs of the baffles and the pot light covers before the blow, and for foam the daily work sheet with lift thickness and density. If the answer is “an invoice”, keep calling.
  8. Are you on the Home Renovation Savings participating list? For the standalone attic rebate the answer must be yes or the rebate does not exist, however good the work. More below.
  9. WSIB clearance, liability insurance and the business licence, please. Three pieces of paper, five minutes to produce. The men who cannot produce them are the ones whose fall from your attic becomes your claim.
  10. What is the deposit and when is the balance due? 10% to 20% on signing for an attic job, no more than the material on a foam job, and the balance after you have looked. Never 50% up front for a one-day job.

Spray foam has its own paperwork, and you should see it

Spray foam is manufactured in your basement. Two drums of chemical meet in a gun and the result depends on drum temperature, ratio, substrate temperature and the thickness of each lift. That is why Canada regulates the installer and not just the product: CAN/ULC S705.1 is the material standard, S705.2 is the installation standard, and the installer allowed to spray under S705.2 carries a photo ID card from a quality assurance program, CUFCA being the common one in Ontario.

Ask to see the card before the first pass, not the certificate on the office wall. The licensed installer has to be the one holding the gun, and I have had a card-holder show up at 8 a.m., leave at 9, and a helper spray the rest of the day. The daily work sheet is the second thing: temperatures, lift thickness, the density test and batch numbers, which is what the manufacturer asks for if the foam shrinks off the studs in two years. The spray foam problems page covers what goes wrong when that sheet was never filled in.

One more foam question: where does the thermal barrier go? Spray foam left exposed inside a living space, a basement, a finished attic, a garage ceiling with a room above, needs 1/2 in. drywall or an intumescent coating over it, OBC 9.10.17. A foam quote that leaves foam bare in a living space is either unfinished or wrong.

WSIB, insurance and the licence

Every insulation company with employees in Ontario must be registered with WSIB, and a clearance certificate is a free document from the WSIB site with the company name and a date on it. It says the company is in good standing on the day it was printed, so ask for one dated the week of the job. Without it, a worker hurt on your property can look to you. Commercial general liability of $2 million is the usual number. A sole proprietor with no employees can legally work without WSIB coverage, fine for a one-man batt installer and not fine for a spray foam job, which needs two men by the nature of the rig.

References and deposits

A siding reference can walk you around the house. An attic reference can tell you the crew was polite and swept the hallway; nobody goes back up in February to check whether the R-60 settled to R-40 over the back bedroom. So ask a different question: can I speak to a homeowner whose attic you did three or more winters ago, about ice dams and the heating bill?

On deposits, Ontario consumer law gives you ten days to cancel a contract signed in your home, and a contractor cannot bill more than 10% over a written estimate without your sign-off. 10% to 20% down is normal; 50% for a $5,000 one-day attic is a company that needs your money to buy the bags. The lines that belong in writing are on the insulation contract checklist, and the inspection checklist is what you check before the balance moves.

The participating list, which decides the rebate before the quote does

The standalone attic rebate under Home Renovation Savings, up to $1,250 if the attic is at R-12 or less and goes to R-50, up to $1,000 from above R-12 to R-25, up to $800 from above R-25 to R-35, is paid only when the work is done by a contractor on the program’s participating list. There are six names on it, including Great Northern Insulation and Home Depot, and enrolment for new contractors is closed. Your excellent local installer who is not on it cannot get you the rebate however well he blows the attic. The rebate is 50% of the after-tax cost up to the cap, paid afterward, if you qualify; check the program site before you sign, because funding is reported to run through November 30, 2026 and the program publishes no end date.

So the hiring decision has a fork in it. If the rebate matters, you are choosing among six companies; if the best local crew is not on the list, you are paying full price for better work, which on a $5,000 attic is a $1,000 question. The insulation rebates page has the conditions and the program page the mechanics. The walls and basement have no standalone rebate at all.

We do not have a contractor network and I will not pretend to. In Simcoe, Muskoka and Georgian Bay a quotation request comes to our inbox and we sort it out ourselves; anywhere else, the questions above and a $99 read of your quotes are what we can offer.

Questions people ask

Does an insulation contractor need a licence in Ontario?

There is no provincial trade licence for blown or batt insulation; a business licence, WSIB registration and liability insurance are the paper trail. Spray foam is different: the installer holding the gun must be certified under CAN/ULC S705.2 through a program such as CUFCA and carries a photo card.

How much deposit should I pay an insulation contractor?

10% to 20% on signing for an attic or batt job, and no more than the cost of the material on a spray foam job. The balance is due after you have checked the depth cards, the bag count or the foam sheet. 50% up front for a one-day job is a warning sign.

What is a CUFCA card and why does it matter?

The photo ID of an installer licensed under the CAN/ULC S705.2 installation standard, issued through the Canadian Urethane Foam Contractors Association quality program. Spray foam is made on site and its quality depends on the person at the gun, so the card is the closest thing to a product warranty the job has.

Can any contractor get me the attic insulation rebate?

No. The standalone attic rebate is paid only when a contractor on the Home Renovation Savings participating list does the work, and contractor enrolment is closed. If the rebate matters, start with that list. Check the program site before you sign; the funding and the conditions change.

Should I get three insulation quotes?

Yes, and compare them on the same ten lines: area, existing R, target R, product, settled depth, air sealing, baffles, hatch, removal and rebate participation. The quote comparison page has the grid. Quotes $2,000 apart usually differ on air sealing, not on fluff.

Know the number before you make the calls

The attic insulation cost calculator prices your attic by area, existing R and target R with the air sealing, baffles, hatch and HST as separate lines, so you walk into the first quote knowing what a fair one looks like. If you already have three and they do not agree, the $99 review reads them against the same list and says which one is missing what.

Price my attic before I callReview my quotes, $99

Sources and further reading