Incentive Details — Building Envelope

Building Envelope Program

Financial Incentive Details

Insulation projects

We offer financial incentives for both roof and wall insulation upgrades. The final incentive paid will cover up to 100% of the material costs of the insulation installed (not including labour and installation materials) and can’t exceed the invoiced amount of these materials.

Effective R-value

The Building Envelope Program measures insulation levels by considering the entire roof and/or wall assembly. This effective R-value calculation includes the insulation materials plus all the components and other materials that make up the decking, sheathing, framing, finishes, and structural elements. It also accounts for air films and thermal bridging of the entire assembly. 

Insulation incentives

Financial incentives for insulation upgrades are calculated using the formulas below. When you apply online, your incentive will be automatically calculated based on your roof or wall assembly details. 

Roof surface: 7.5¢ × R-value added × Roof area (ft2)  

Roof cavity: 2.0¢ × R-value added × Roof area (ft2)  

Wall surface: 7.5¢ × R-value added × Wall area (ft2)  

Wall cavity: 4.0¢ × R-value added × Wall area (ft2


10,000 ft2 roof surface insulation upgrade going from R-8 to R-28 (R-value added = R-20) 

Estimated incentive: 7.5¢ x 20 x 10,000 ft2 = $15,000 


We offer financial incentives for replacing windows and glazed doors, curtain wall projects, and storefront window upgrades.  

Eligible window projects include those that involve a whole window replacement (including the frame). Windows retrofitted with new glass into the existing frame may qualify for an incentive only if the performance of the retrofitted window has been modelled by an accredited, independent agency and the overall U-value of the window, including the existing frame, meets the program’s requirements for thermal performance.  

Eligible doors must include glazing and can be sliding patio doors, garden doors, single-swinging doors, rolling doors, or folding-style doors.  


The Building Envelope Program measures window and door performance according to the metric U-value of the entire assembly, including the frame. A new window’s U-value is typically provided by a certified third-party rating agency like ENERGY STAR® Canada or the National Fenestration Rating Council (NFRC). Window and door performances vary depending on a number of factors including frame materials, number of window panes, and spacers. Metric U-values are typically between 0.8 and 1.6. A lower number means better thermal performance. 

Your project must meet the following thermal performance values: 

Financial incentives for window and door replacements are calculated using the formulas below. When you apply online, your incentive will be automatically calculated based on your window or door assembly details. 

Window: $150 × [1.6 – U-value] × Window area (m2)  

Curtain wall/storefront: $200 × [2.0 – U-value] × Storefront area (m2)  

Swinging door: $150 × [1.6 – U-value] × Door area (m2)  

Sliding door: $200 × [1.6 – U-value] × Door area (m2)  


20 new picture windows, each sized at 613/4″W × 39″H; U-value = 0.84  

Estimated incentive: $150 × [1.6 – 0.84] × 30m2 = $3,420