Insulation Contract Checklist (Ontario): Scope, Product and R-Value in Writing, Depth Markers, Air Sealing Itemized, Removal by Unit Rate, the Contamination Line, Rebate Paperwork, Holdback and Payment

Insulation & Air Sealing

The Insulation Contract: If the R-Value Is Not a Number on the Page, You Have Not Bought One

Most insulation quotes in Ontario are one line long: “Blow attic to R-60, $3,400.” That is not a contract; it is an aspiration with a price. It does not say how big the attic is, what is up there now, what product is going in, how deep it will be when it settles, whether the top plates get sealed first, what happens if the crew finds vermiculite, or who fills in the rebate form. Every one of those is where the money goes when the job goes sideways. This is the list of lines I would want on the paper before a deposit leaves my account, and the reasons behind each.

Ontario, the Consumer Protection Act and the Construction Act as they stand in October 2026. Rates before HST, from the same schedule the calculators use.

Why one line is not enough

Insulation is sold by the result and installed by the bag. The result, R-60, cannot be seen from the hatch and will not be measured by anybody after the truck leaves. The bags can be counted. So the contract has to turn the result into things that can be counted and photographed, or all it guarantees is that someone will come and blow something. The quote comparison page has the ten-line grid for weighing quotes against each other; this page is what the winning quote becomes before you sign it. I write my own subcontracts this way and the good subs do not mind. The ones who object to writing the depth down are telling you what the depth will be.

The fourteen lines

  1. The area, in square feet, measured. “The attic” is not a quantity. 1,180 sq ft of attic floor, or 984 sq ft of basement wall net of windows. Every unit rate on the page multiplies this number.
  2. The existing R, as measured on the site visit. R-20 of 6 in. settled cellulose, or R-12 of 4 in. fibreglass. This line sets the rebate tier and the bag count, and it is the one most often guessed.
  3. The target R and the product by name. R-60 blown cellulose, brand and CCMC number; closed cell 2 lb foam, brand, 2 in.; R-22 mineral wool batts. “Insulation” is not a product.
  4. The settled depth and the number of bags. 16.5 in. settled for cellulose at R-60, and the bag count from the coverage chart. A contractor who will not write the bag count does not intend to be held to it.
  5. Depth markers, one per 300 sq ft, visible from the hatch. Five minutes of work, and the only way you or a buyer will ever check the depth without crawling.
  6. Air sealing, itemized by location. Top plates, plumbing stacks, wire penetrations, duct boots, the chimney dam, pot light covers at $45 each, the hatch gasket and insulated hatch at $200. $0.75 to $1.50 per sq ft, $600 minimum. “Air sealing included” with no list has included nothing.
  7. Baffles in every rafter bay, $3.50 each, about $300 on an average house, with the insulation stopped clear of the soffit vent. Without them the first blow buries the ventilation and the ice dams start the first winter.
  8. Removal as a unit rate, if there is any. Dry blown by vacuum truck $1.50 to $3.50 per sq ft, batts hand-bagged $2.50, rodent contamination plus $1.00 and $300 for the disinfecting fog. Removal is only needed when the old insulation is wet, mouldy, contaminated or in the way; removing dry clean insulation to “start fresh” is a second job you do not need.
  9. The contamination line. What happens if the crew finds vermiculite, wet insulation, mould, knob-and-tube or a bathroom fan venting into the attic: work stops, you are called, a written change order is priced before anything continues, and nothing is blown over any of it. Wet or mouldy insulation is quoted after inspection, never at a unit rate.
  10. For spray foam, the thickness, the density and the thermal barrier. 2 in. closed cell in the rim, 3 in. on the basement wall, the daily work sheet handed over at the end, and 1/2 in. drywall or an intumescent coating at $1.25 to $2.00 per sq ft over any foam exposed in a living space, OBC 9.10.17. Masking at $150 to $500 and backing at $2.00 per sq ft as their own lines.
  11. Rebate paperwork: who files, who is on the list, and what happens if it is refused. The standalone attic rebate is paid only if the contractor is on the Home Renovation Savings participating list. The contract names the program, says the contractor is on the list as of the signing date, says who submits the application and the photographs, and says plainly that the rebate is not guaranteed and the price does not depend on it. Check the program site before you sign.
  12. Payment: deposit, balance and when. 10% to 20% deposit; balance after your inspection, which is the inspection checklist, not after the truck door closes.
  13. The holdback. Under the Ontario Construction Act, 10% of the contract price is held back for 60 days after the work is substantially complete, against liens from unpaid suppliers or crews. On a $5,000 job that is $500 for two months. Good contractors expect it; the ones who have never heard of it have never worked for a builder.
  14. Warranty, in years, in writing, with the company address. Settling below the contracted depth within five years, foam pulling away from the framing, and what the remedy is. A warranty from a cell phone number is a hope.

The consumer law you already have

A contract for renovation work signed at your house is a direct agreement under the Ontario Consumer Protection Act, and three things follow. You have a ten-day cooling-off period to cancel in writing for any reason. The contractor cannot charge more than 10% over a written estimate unless you agree in writing, which is why the contamination line matters: without a priced change order, the vermiculite surprise is not your problem at that price. And the contract has to be in writing with the price, the work and the dates, or you can cancel it within a year. None of that gets you an R-60 attic; it gets you out of a bad contract. The lines above get you the attic.

A contract priced the way the page says

1,200 sq ft attic, 6 in. settled cellulose at about R-20, to R-60, cellulose, contractor on the participating list. Air sealing itemized: top plates, two plumbing stacks, wiring, four duct boots, six pot light covers, chimney dam, 1,200 at $1.00 is $1,200. Baffles, 42 bays, $300. Insulated and gasketed hatch, $200. Blown cellulose top-up, 40 R-points at $0.065 is $2.60 per sq ft, 1,200 at $2.60 is $3,120, bag count from the coverage chart written in, settled depth 16.5 in., six depth markers. Subtotal $4,820, HST $627, total $5,447. Deposit 15% of the total, $817; balance on inspection; 10% holdback, $545, released at 60 days. Removal: none, old insulation dry and clean. Contamination: work stops, change order priced before continuing. Rebate: contractor named, on the participating list as of the signing date, files within 30 days with photographs; if the house qualifies, up to $1,000 comes back afterward, 50% of the after-tax $5,447 is $2,723, capped at $1,000, not deducted from the price.

That is the job the attic cost page prices, in the order a contract wants it. Change the attic to the basement and the structure holds: wall area net of windows, assembly named, foam thickness and the thermal barrier, rim joist by the linear foot at $5.50, poly or no poly stated; the basement cost page has the four assemblies to name. And if the contract tightens the house, a line saying who checks the ventilation afterward, bath fans, HRV, the furnace and water heater draft, is worth having.

The lines missing most often

Air sealing by location is missing from more than half the quotes I read. The bag count is on almost none. The contamination line is on none until the homeowner asks, which is why the vermiculite stop costs people $2,000 they were not expecting instead of $2,000 they were warned about. The thermal barrier is missing from most basement foam quotes, which is how bare foam ends up behind a futon. The hiring page covers how to find the contractor who will not mind writing them in.

Questions people ask

What should an insulation quote include in Ontario?

Measured area, existing R, target R, product by brand, settled depth and bag count, air sealing itemized by location, baffles, hatch, removal as a unit rate, a contamination line, the thermal barrier for foam, rebate paperwork and the participating list, deposit, holdback and warranty. One line with a price is a sales call, not a contract.

Is there a holdback on a home insulation job?

The Ontario Construction Act applies a 10% holdback for 60 days after substantial completion on improvements to land, which includes a homeowner hiring an insulation contractor. On a $5,000 attic that is $500 held for two months against supplier or crew liens. Write it into the contract so nobody is surprised.

Can I cancel an insulation contract in Ontario?

If it was signed at your home, the Consumer Protection Act gives a ten-day cooling-off period to cancel in writing for any reason. A contract that was never put in writing can be cancelled within a year. Cancelling after the attic is blown is a different matter, which is why the inspection happens before the balance.

Should the rebate be deducted from the insulation price?

No. The Home Renovation Savings attic rebate is paid to you afterward, 50% of the after-tax cost up to the cap, only if the house qualifies and the contractor is on the participating list. A quote that shows the price “after rebate” is showing a number the contractor does not control. Check the program site before you sign.

What is a contamination clause in an insulation contract?

A line that says what happens if the crew finds vermiculite, wet or mouldy insulation, knob-and-tube wiring or a fan venting into the attic: work stops, you are told, a priced change order is written before anything continues, and nothing is blown over any of it. Without it, the surprise is priced on the day, from the top of a ladder.

Build the contract lines from the calculator

The attic insulation cost calculator produces the same lines in the same order, area, existing R, target R, product, air sealing, baffles, hatch, removal, HST and the rebate check, so the quote you take to the contractor already looks like the contract you want back. If the quote you were handed is one line long, the $99 review turns it into the fourteen and tells you which ones to ask for.

Price my attic line by lineReview my quotes, $99

Sources and further reading