Published by RonOvations. This guide helps homeowners compare attic insulation scopes and prepare questions for an installer.
Updated October 13, 2026. All prices are in Canadian dollars. The amounts below are budgeting allowances, not fixed RonOvations quotes.
Blown in insulation cost depends on attic size, existing coverage and preparation. For a straightforward attic top up in Canada, this guide uses $1.50 to $3.50 per square foot installed as an illustrative budgeting allowance. A 1,000 sq. ft. attic therefore has an example budget of $1,500 to $3,500, before taxes, major removal or corrective work. These figures are not fixed RonOvations quotes or a verified national average.
The first question to ask is not just “How much per square foot?” It is “What does that price include?” Two estimates can cover the same attic and still describe very different jobs.
Blown in insulation cost by attic size
Measure the attic floor area, not the total living space listed for the house. A two storey home with 2,000 sq. ft. of living space may have a much smaller attic footprint. Separate attic sections and additions can also change the measured area.
| Attic floor area | Budget at $1.50 per sq. ft. | Budget at $3.50 per sq. ft. |
|---|---|---|
| 600 sq. ft. | $900 | $2,100 |
| 800 sq. ft. | $1,200 | $2,800 |
| 1,000 sq. ft. | $1,500 | $3,500 |
| 1,200 sq. ft. | $1,800 | $4,200 |
| 1,500 sq. ft. | $2,250 | $5,250 |
| 2,000 sq. ft. | $3,000 | $7,000 |
These figures apply the planning allowance to different attic sizes. They are not recorded customer invoices or a national average. A full installation in a bare attic, extensive air sealing or a project involving contaminated material needs its own assessment and price.
For example, a 1,200 sq. ft. attic priced at $2.25 per square foot has an illustrative insulation subtotal of $2,700. Removal, repairs and tax should be shown separately if they are not included. Do not subtract a potential rebate until your eligibility and the approved amount are confirmed.
Where the price allowance comes from: The $1.50 to $3.50 range was used in this guide’s earlier edition. It has not been established from a representative sample of current RonOvations quotes across the three provinces. Treat the table as a worked budgeting example, not evidence of the price available in your town. A current written estimate is the basis for a purchasing decision.
What changes the installed price?
Existing insulation and the amount being added
Adding insulation to a dry attic with reasonable existing coverage is a different job from filling a nearly bare attic. Ask the installer to record the existing material and depth in several places, estimate its R value and specify the final target. The same floor area can need very different quantities of material.
Air sealing and attic hatch preparation
Insulation slows heat transfer. Gaps around ceiling penetrations can still let indoor air escape into the attic. Those gaps need suitable sealing before they are buried. An accessible attic hatch may also need weatherstripping, insulation and a retaining barrier to keep loose material out of the opening.
Ask which locations are included in the air sealing allowance and how the contractor will handle areas that cannot be reached. A vague promise of “basic prep” is difficult to compare with a quote that lists the actual work.
Preparation also has safety limits. Insulation must respect the required clearances around chimneys, combustion vents and fixtures. Older wiring needs assessment rather than being covered without inspection. Product instructions and qualified advice should determine these details; a homeowner cost guide cannot replace a site assessment.
Baffles and ventilation
In a vented attic, insulation must not obstruct the intended airflow from the soffits. Baffles and insulation stops may be needed at the eaves. The right arrangement depends on the roof assembly, so adding an arbitrary number of vents is not a substitute for checking the airflow path.
Our guide to attic ventilation and roof health explains how the roof and attic work together. Ask the installer to identify any ventilation corrections before pricing the insulation.
Removal, repairs and access
Wet insulation, pest contamination, roof leaks, awkward access or several small attic compartments can increase the work. Removal and disposal should have a separate scope, especially when hazardous material is suspected. There is no reliable universal removal surcharge that applies to every attic.
If the attic has staining or frost, identify the cause before adding material. A roof leak and attic condensation can leave similar clues, but require different corrections.
Fibreglass or cellulose, which should you choose?
Both loose fill fibreglass and cellulose can be suitable for accessible attics. Comparing the installed result is more useful than comparing the cheapest bag. Product availability, coverage, the amount needed and preparation all affect the final cost.
| Consideration | Fibreglass | Cellulose |
|---|---|---|
| Material | Glass fibres | Typically recycled paper fibres with treatment for fire resistance |
| Depth and coverage | Follow the selected product coverage chart | Follow the selected product coverage chart and settled thickness requirements |
| Settling | Depends on the product and installation | Account for settling as specified by the manufacturer |
| Air sealing | Separate sealing work is needed | Separate sealing work is needed |
| Best basis for comparison | Documented R value, coverage, scope and total price | Documented R value, coverage, scope and total price |
Cellulose fitting around framing does not make it a substitute for a continuous air barrier. Likewise, moisture resistance is not a reason to leave either material beneath an active leak. Keep the attic dry and address air leakage before choosing the insulation.
Natural Resources Canada’s insulation material guide describes loose fill options and their appropriate uses. Spray foam is a different insulation system, so compare it with loose fill only when both proposals address the same assembly and scope.
How much insulation is needed for R 60?
There is no single depth that delivers R 60 for every blown insulation product. The installer needs the exact product, its coverage chart, the existing insulation contribution and the required installed or settled thickness. A generic promise of “18 inches” does not tell you the final performance.
The number of bags matters too. Depth alone can be misleading if the material is installed at the wrong density. Ask for the product name, bag count, attic area, final R value and depth measurements in the completion record.
R 60 can be a useful target for some projects, but it is not a universal legal minimum for all existing homes in Ontario, Manitoba or Alberta. Climate, assembly, local requirements and rebate rules can differ. Confirm the target for your property instead of assuming that one number applies everywhere.
Settling should be handled through the manufacturer’s instructions, not by adding an arbitrary percentage of extra material. Natural Resources Canada’s roof and attic guidance recommends agreeing on the bag count, expected insulating value and minimum settled depth when planning loose fill installation.
Can you add new insulation over the old material?
Often, yes, when the existing material is dry, clean and suitable to remain. The assessment should also check for air leaks, blocked ventilation, electrical concerns, unsafe clearances and signs of pests. Adding material over an unresolved problem can hide it without correcting it.
If vermiculite may be present, leave it undisturbed. Some vermiculite insulation contains asbestos. Do not rake, vacuum or sample it yourself. Follow Health Canada’s asbestos guidance and arrange qualified assessment before work that could disturb it.
Planning an attic upgrade in Ontario, Manitoba or Alberta
A general budgeting allowance is useful for a first estimate. The actual proposal needs to reflect your home, local labour, product availability and any program you plan to use. The following program information was checked on October 13, 2026.
Ontario, check the rebate route before booking
Ontario’s Home Renovation Savings attic insulation offer lists a maximum rebate of $1,250 for the lowest eligible starting insulation level, with lower caps for other eligible starting levels. Its standalone attic offer requires a participating contractor and does not require a home energy assessment. Current eligibility, whole roof assembly coverage and final insulation requirements still apply.
Confirm the program route and contractor eligibility before work begins. Other program streams can have different assessment requirements. Do not assume every installer can deliver the standalone rebate.
If you are arranging an attic assessment alongside roofing work, start with our Ontario team and service areas. Share your address, approximate attic area and any photos of existing conditions. Ask about local insulation availability and program participation before making a booking.
Manitoba, look at insulation and air sealing together
Efficiency Manitoba’s Home Insulation Rebate covers qualifying upgrades and has specific original and final R value requirements. It also offers an air sealing bonus subject to its assessment and performance conditions. Check approval requirements before purchasing material or starting the project.
For local coordination, our Manitoba service area page is the place to confirm coverage and discuss any roofing concerns that should be resolved before the attic is insulated.
Alberta, distinguish financing from a rebate
In participating Alberta municipalities, the Clean Energy Improvement Program includes eligible insulation upgrades. This is financing, not a blanket provincial cash rebate. Municipality participation, intake availability, qualification and repayment terms need to be checked for your address.
Use our Alberta service area page to confirm local coverage and coordinate roof or attic concerns. The insulation scope should be based on your property rather than copied from an Ontario estimate.
Older guides may still mention the Canada Greener Homes Grant or Loan. Both are listed as closed on the official Canada Greener Homes program page. Do not include them as available funding for a new application.
How to compare blown insulation quotes
Ask each contractor to price the same target and preparation. A lower rate can be perfectly reasonable, but you need to know whether it describes less work, a different product or a smaller insulation upgrade.
- Measured area: the attic floor area included in the job.
- Starting condition: material, condition, depth and estimated existing R value.
- Finished specification: product, target R value, coverage, bag count and required thickness.
- Preparation: specific air sealing locations, baffles and attic hatch work.
- Separate work: removal, disposal, testing, repairs and any hazardous material assessment.
- Total price: labour, material, tax, exclusions and how additional work is approved.
- Completion evidence: depth measurements, coverage photos and product information.
- Program eligibility: participating contractor requirements and documentation, if applicable.
- Service terms: schedule, payment terms, liability coverage and the written workmanship warranty.
Keep before and after photos and the written scope with your home maintenance records. If roof damage is found during the assessment, agree on the repair before covering the area with fresh insulation.
A lower rate can describe a different job
Consider two hypothetical estimates for the same 1,200 sq. ft. attic and the same final R value. Quote A is $2.25 per square foot, or $2,700 before tax, for insulation installation only. Quote B is $2.75 per square foot, or $3,300 before tax, and includes specified air sealing, baffles and attic hatch preparation.
The difference is $600. Ask contractor A to price those same preparation items before deciding. If its extras exceed $600, the apparent price advantage disappears. If preparation is already satisfactory, some of contractor B’s work may not be needed. Compare the actual attic condition, equivalent products and the complete scope, then check warranty and service terms. Neither quote is a real RonOvations customer estimate.
Is the upgrade worth it, and how long will it take?
An attic upgrade can improve comfort and reduce heat loss when it addresses low coverage and air leakage. The result depends on the house, heating system, climate and starting condition. A single percentage saving or guaranteed payback period cannot describe every home.
For scheduling, a straightforward top up may fit within one working day. Extensive preparation, removal or repairs can take longer. Program approval and energy assessments, when required, are separate from the on site installation time. Ask for both the installation schedule and any steps that must happen first.
Frequently asked questions
How much does blown in insulation cost per square foot in Canada?
Use $1.50 to $3.50 per square foot as an initial allowance for a straightforward attic top up. It is not a guaranteed installed price. Existing insulation, the target R value, preparation, access and tax determine the final quote.
What does a 1,200 sq. ft. attic cost to insulate?
Applying the allowance gives $1,800 to $4,200 before tax and major corrective work. That calculation assumes 1,200 sq. ft. of attic floor, not 1,200 sq. ft. of total living space.
Is R 60 required in every Ontario attic?
No single retrofit target applies to every existing attic. The appropriate value depends on the assembly, local requirements and any program conditions. Confirm the specification for your home before comparing quotes.
Does cellulose replace air sealing?
No. Loose fill cellulose and fibreglass provide insulation. Gaps in the ceiling air barrier need their own suitable sealing materials and methods.
Should old insulation always be removed?
No. Clean, dry insulation can often remain. Wet, contaminated or unsuitable material needs assessment, and suspected vermiculite should be left undisturbed until qualified professionals advise on it.
Can I install it myself and still receive a rebate?
Check the exact program first. Ontario’s standalone Home Renovation Savings attic offer requires a participating contractor. Other programs have their own rules. A blower rental does not establish rebate eligibility or replace an assessment of attic conditions.
Get a scope you can compare before you commit
A useful estimate explains the attic area, what is already there, what needs correcting and what the finished insulation will achieve. That is the information you need to judge the price.
Learn about RonOvations’ blown in attic insulation service or contact the team about your property. Include your province, town and any concerns about leaks, condensation or uneven insulation so the next step fits the actual job.
How this guide was prepared
This update was prepared with AI assistance and checked against the public technical and program sources linked in the article. Natural Resources Canada informs the discussion of materials, air leakage, coverage and settled depth. Health Canada informs the vermiculite warning. The program operators are the sources for their own eligibility and funding information. These sources serve different purposes: technical guidance does not validate an installation price, and a rebate condition is not a universal building code requirement.
The cost tables and quote comparison are illustrative calculations, not original field research. No named installer has been identified as the technical reviewer of this edition, and no company project results are claimed. The article covers accessible residential attics; cathedral ceilings, unvented assemblies and commercial roof insulation need separate assessment.
Technical and program sources were checked on October 13, 2026. This revision clarifies pricing assumptions, product specific depth and settling, and the differences between the three provincial program options. If a figure or program condition appears out of date, send RonOvations the article URL and the item that needs checking.
