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Attic Insulation Cost Calculator

Estimate 2026 attic-insulation cost in Canadian dollars: material, labour and total installed price for blown cellulose, fibreglass, batts and Roxul. NBC 2020 9.36.2 R-60 targets.

Attic Insulation Cost Calculator

Estimate material, labour and total cost to top up attic insulation. Pricing reflects 2026 Canadian averages from HomeStars and CRCA bid data.

Total installed cost (CAD)
$3,020
Cost per sq ft: $2
Material cost (CAD)
$850
50 × $17
Labour cost (CAD)
$2,170
Reference standard
NBC 2020 9.36.2
Sources: HomeStars 2026, CRCA, Renomii

What this calculator does

This tool estimates the total installed cost of an attic-insulation top-up in 2026 Canadian dollars, broken into material and labour. It uses 2026 HomeStars and Renomii bid-data averages with CRCA member-installer benchmarks, adjusted for climate zone, access difficulty and material choice.

Enter your attic floor area in sq ft, the target R-value (use 60 for the NBC 2020 default in most of Canada), the existing R-value, the insulation type and how easy the attic is to access. The calculator returns the material cost, labour cost, total installed cost and the cost per sq ft.

How the cost math works

  1. Material cost = bag count × bag price. Bag count is derived from the manufacturer’s coverage table at the gap-R you’re filling. A 22-pound bag of Climatizer Plus cellulose covers 30 sq ft at R-30; at R-60 it covers 30 × 30/60 = 15 sq ft. 2026 trade-counter pricing: CAD 17 per bag cellulose, CAD 22 per bag blown fibreglass, CAD 48 per bundle of R-30 fibreglass batts, CAD 56 per bundle of Roxul ComfortBatt.
  2. Labour cost = area × labour rate × access multiplier. The 2026 HomeStars baseline for normal-access attics is CAD 1.55 per sq ft. Easy walk-up attics get 0.85; difficult attics with knee walls or low pitch get 1.40.

Material cost breakdown

Material2026 unit priceCoverage at R-60CAD/sq ft installed
Climatizer Plus celluloseCAD 17 / 22-lb bag15 sq ftCAD 1.30–1.65
Owens Corning ProPink fibreglassCAD 22 / bag21 sq ftCAD 1.55–2.00
Johns Manville R-30 batt (×2 layered)CAD 48 / 75 sq ft bundle75 sq ft per layerCAD 2.10–2.60
Roxul ComfortBatt R-30 (×2 layered)CAD 56 / 60 sq ft bundle60 sq ft per layerCAD 2.30–2.90

For R-60 with batts, installers typically lay two perpendicular layers of R-30 — one between the joists, one across the joists. This is more labour than a single deeper batt, which is why batt-installed pricing is higher than blown.

Labour cost benchmarks

HomeStars 2026 contractor-bid data shows three labour bands:

  • Easy walk-up attic, full headroom: CAD 1.20 to CAD 1.40 per sq ft
  • Normal pull-down hatch, average pitch: CAD 1.55 to CAD 1.85 per sq ft
  • Difficult — knee walls, cathedral, low pitch: CAD 2.10 to CAD 2.75 per sq ft

Regional variation: Greater Toronto and Greater Vancouver run 12 to 18 percent over the national median; the Prairies (Calgary, Edmonton, Winnipeg) sit close to the median; Quebec runs 5 to 10 percent below; Atlantic Canada runs flat to slightly below median, but with limited installer availability outside major centres.

Vapour barriers and air-sealing — Canadian-specific issues

Canadian attics need a sealed warm-side vapour barrier in heating-dominated climates (HDD ≥ 4,000) per NBC 9.25.4. Older homes often have a poorly-detailed 6-mil polyethylene barrier with gaps at every electrical box, plumbing stack, and partition wall — which means the air-barrier strategy for the retrofit becomes the deciding factor in performance.

Two retrofit strategies:

  1. Existing barrier in good shape: top up the insulation directly. Verify by infrared scan and CAN/CGSB-149.10 blower-door test.
  2. Existing barrier compromised: spray-foam the ceiling deck (1.5 to 2 inches of closed-cell polyurethane) before topping up, creating a new continuous air barrier. Adds CAD 1.50 to CAD 2.20 per sq ft to the bid but solves the air-leakage problem permanently.

CRCA member installers typically include a blower-door test with a deeper retrofit. Without the test, you’re guessing at whether the barrier is doing its job.

NBC 2020 climate-zone R-value targets

HDD zoneLocationsNBC 9.36.2 attic minTypical depth (cellulose)
< 3,000Vancouver, VictoriaR-4011.5 in
3,000–4,000Lower Mainland BC, southern Ontario lakeshoreR-5014.3 in
4,000–5,000Toronto, Ottawa, southern QuebecR-6017.2 in
5,000–6,000Montreal, Calgary, Edmonton, WinnipegR-6017.2 in
6,000–7,000Saskatoon, Regina, Quebec CityR-6017.2 in
> 7,000Yellowknife, Whitehorse, IqaluitR-60 to R-8017–23 in

Provincial overlays apply. Ontario SB-12 sets stricter targets for heating-only assemblies and has tighter rules for cathedral ceilings. Quebec RBQ Code energy-efficiency provisions push some R-50 zones to R-60 effective.

Provincial rebates in 2026

  • British Columbia CleanBC Better Homes: CAD 0.45 to CAD 0.90 per sq ft for verified attic top-ups; pre-application required.
  • Ontario Save on Energy (Enbridge / IESO): CAD 0.40 to CAD 0.80 per sq ft, often paired with a free home energy audit.
  • Quebec Rénoclimat: CAD 0.55 to CAD 1.10 per sq ft, requires a pre- and post-job EnerGuide evaluation.
  • Manitoba Home Insulation Rebate (Manitoba Hydro): up to CAD 1,500 flat rebate per home.
  • Saskatchewan Home Renovation Tax Credit: 10.5 percent provincial credit on eligible renovations including insulation, up to CAD 2,100 per year.
  • Federal Greener Homes Loan: interest-free up to CAD 40,000 for deeper retrofits, paired with most provincial programs.

The DSIRE-equivalent for Canada is the NRCan database at natural-resources.canada.ca; check eligibility before signing any contractor.

Comparing Canadian contractor quotes

A clean 2026 quote should itemise: product spec (manufacturer, R-value, CSA listing), area in sq ft, labour with access factor, vapour-barrier scope, and air-sealing scope. CRCA-member installers will provide a blower-door pre- and post-test on deeper retrofits.

Red flags: quotes that don’t specify final R-value, quotes more than 25 percent below the HomeStars regional median (the contractor is likely skipping vapour-barrier work), quotes that bundle insulation and roofing into a single line, and quotes that don’t account for downlights or recessed cans. Premium quotes (CRCA-member or BPI-certified) should justify with documentation.

Frequently asked questions

How much does attic insulation cost in Canada in 2026?
For a 1,400 sq ft attic, expect CAD 2,800 to CAD 4,200 installed for a top-up from R-28 to R-60, the NBC 2020 9.36.2 target for most of Canada. HomeStars 2026 data puts the national average at CAD 2.20 to CAD 2.80 per sq ft installed, with material running 30 to 40 percent and labour 60 to 70 percent. Atlantic provinces and the Prairies sit close to the national median; BC and Ontario typically run 8 to 15 percent higher; Quebec sits 5 to 10 percent below the median.
What's the cheapest attic insulation in Canada?
Blown cellulose (Climatizer Plus, Igloo Cellulose) runs CAD 1.30 to CAD 1.65 per sq ft installed and is the price leader. Blown fibreglass (Owens Corning ProPink, Johns Manville Spider Plus) runs CAD 1.55 to CAD 2.00. R-60 fibreglass batts run CAD 2.10 to CAD 2.60. Roxul ComfortBatt mineral wool runs CAD 2.30 to CAD 2.90. Cellulose wins on R-per-dollar; Roxul wins on fire and rodent resistance for older homes.
Are there 2026 grants for attic insulation in Canada?
Yes. The Canada Greener Homes Grant ended 2024 but provincial programs remain active in 2026: Saskatchewan Home Renovation Tax Credit, Manitoba Home Insulation Rebate, BC CleanBC Better Homes (CAD 0.45 to CAD 0.90 per sq ft), Ontario Save on Energy (utility-funded, CAD 0.40 to CAD 0.80 per sq ft via Enbridge and Hydro One programs), and Quebec Programme Rénoclimat (CAD 0.55 to CAD 1.10 per sq ft). The federal Greener Homes Loan (interest-free, up to CAD 40,000) covers insulation as part of a deeper energy retrofit.
What R-value does NBC 2020 require?
NBC 2020 Section 9.36.2 mandates attic R-60 for heating-degree-day (HDD) zones at or above 5,000, which covers most of Canada including all of Quebec, Ontario, Manitoba, Saskatchewan, Alberta and the territories. Vancouver and southern Vancouver Island (HDD around 3,000) drop to R-50 minimum. Atlantic provinces typically follow R-60. Provincial code overlays apply: Quebec's RBQ pushes some assemblies higher; Ontario's SB-12 has supplementary rules for log and timber-frame homes.
Should I do it myself?
DIY blown-insulation top-ups are realistic in Canadian attics under 1,800 sq ft with easy access. Home Depot, RONA and Réno-Dépôt rent the blower free with a 10-bag minimum. DIY material cost runs CAD 700 to CAD 1,200 versus CAD 2,800 to CAD 4,200 contractor-installed. The trade-off is air-sealing — Canadian winters punish unsealed ceilings harder than US ones, and a contractor will typically caulk top plates, foam penetrations, and replace non-IC cans before blowing. CSA F326-M91 air-tightness measurement is the Canadian benchmark.
Does the cost include vapour-barrier work?
Usually yes, in scope. Canadian retrofits in HDD 5,000+ zones typically require a sealed warm-side vapour barrier (CAN/CSA-A440-M or 6-mil polyethylene with acoustical sealant at all penetrations). Adding the vapour barrier as part of a retrofit is labour-intensive and adds CAD 0.40 to CAD 0.85 per sq ft to the bid. Many retrofit jobs use the existing ceiling drywall as the air barrier, with new acoustical sealant and tape at penetrations — cheaper but requires careful detailing.
What's the payback period in 2026?
NRCan EnerGuide 2025 data shows a typical 1,400 sq ft Canadian home moving from R-28 to R-60 saves CAD 280 to CAD 480 per year on heating, with paybacks of 7 to 14 years on a CAD 3,500 net install (after typical CAD 600 to CAD 900 in provincial rebates). Northern climates (HDD 7,000+) see paybacks closer to 5 to 8 years. Vancouver Island and southern BC see longer paybacks (10 to 16 years) because heating loads are smaller.
How much for a 2,000 sq ft attic?
At 2026 rates, a 2,000 sq ft Canadian attic top-up to R-60 with blown cellulose runs CAD 3,400 to CAD 5,400 installed. Blown fibreglass runs CAD 3,800 to CAD 6,000. Roxul ComfortBatt R-60 runs CAD 4,800 to CAD 7,200. Provincial rebates can return CAD 800 to CAD 1,800; combined with the federal Greener Homes Loan, the net out-of-pocket on a deeper retrofit can be near zero with payback through energy savings.

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