When construction materials and embodied carbon are taken into account, buildings in Canada account for almost 30% of the nation's greenhouse gas emissions. This raises a crucial challenge for Canadian colleges pursuing net-zero goals: should we demolish and rebuild or modify what we presently have?
In summary, retrofitting is nearly always the better option in terms of cost, emissions, and sustainability—but only when done intelligently. TGCC assists organizations in making decisions in this precise manner.
The Numbers Don't Lie: Embodied Carbon vs. Operational Savings
When evaluating retrofit versus rebuild, you need to understand two types of emissions:
| Emission Type | What It Is | Typical Share of Lifecycle Carbon |
|---|---|---|
| Embodied carbon | Emissions from extracting, manufacturing, transporting, and constructing materials | 20-25% for standard buildings; 45-50% for highly efficient buildings |
| Operational emissions | Emissions from heating, cooling, lighting during building use | 75-80% for standard buildings; drops as buildings become more efficient |
The problem is that a building's lifecycle footprint becomes more dominated by embodied carbon the more energy-efficient it is. Rebuilding frequently entails beginning with a significant carbon debt from steel, concrete, and construction, which can take decades to reverse through operational savings.
By reusing the current building, retrofitting completely avoids this embodied carbon bomb.
Real Canadian University Case Studies
University of Calgary: The MacKimmie Complex
The University of Calgary's MacKimmie Complex redevelopment is a textbook example of smart retrofitting:
- 86% less energy than the version before the retrofit
- 84% decrease in operational greenhouse gas emissions
- Reusing the current tower rather than removing it saved 2,800 tons of CO2
- Despite campus expansion, the university has cut overall campus emissions by 30–39% since 2010
- This has resulted in yearly cost reductions of $4.8–6 million
The project is working toward LEED Platinum rating and received certification from the Canada Green Building Council as a Zero Carbon Building.
Dalhousie University: Killam Memorial Library
Dalhousie's two-year deep-energy retrofit of its largest library proves Atlantic Canada can do this too:
- 50% or more decrease in carbon emissions and energy use
- Utility expenses were reduced by 53%, saving around $500,000 annually.
- $17.6 million for the retrofit (including about $500,000 in federal and provincial subsidies)
- Early findings indicate savings that are 44% higher than initial goals.
- In 2025, Dalhousie exceeded its 30% goal by reducing overall campus GHG emissions by 45%.
University of Toronto: Deep Energy Retrofits
- The Canada Infrastructure Bank awarded the University of Toronto $56 million for significant energy retrofits at its St. George campus.
- Lower borrowing rates are anticipated to save $13 million over a 25-year period.
- Campus GHG reduction of 37% by 2030 (compared to the baseline of 91,000 tons CO2e in 1990)
- By 2050, we want to be net-negative or climate-positive.
Deep Retrofits: The Sweet Spot
Retrofits are not all created equal. A straightforward LED swap is insufficient. A deep retrofit, which is characterized by a minimum 50% decrease in energy consumption intensity, is what counts.
Natural Resources Canada states that deep energy retrofits, or DERs, can:
- Cut building energy use by 50–70%
- When used with renewable energy, reduce greenhouse gas emissions by 80–100%.
- Over a 20-year period, save homeowners up to $7,000 annually.
Crucially, by 2050, 80% of North America's current structures will still be in service. Without retrofitting them, Canada cannot reach its climate targets. Up to 60,000 large Canadian buildings (greater than 25,000 square feet) must increase their efficiency by 20–40% in order to cut emissions by 30% by 2030.
The Cost Reality Check
Yes, retrofits require upfront investment. But the math favors retrofitting:
| Factor | Retrofit | Rebuild |
|---|---|---|
| Upfront cost | Lower (reuse structure) | Higher (full demolition + new construction) |
| Embodied carbon | Avoided (existing structure) | Massive (new materials) |
| Time to completion | Often faster (phased approach possible) | Longer (full construction cycle) |
| Operational savings | 40-85% energy reduction possible | High efficiency but ignores embodied carbon |
| Disruption | Can be phased by building zone | Full campus displacement |
With a $35 million investment, the University of Calgary's Utility Reduction Program currently saves more than $6 million a year and removes 30,000 tonnes of greenhouse gas emissions. Without accounting for continuing savings, that amounts to a payback period of about six years.
Practical Decision-Making Framework
TGCC recommends institutions ask these questions before deciding:
1. What's the building's structural condition?
If the skeleton is sound, retrofit. If foundation or structural integrity is compromised, rebuilding may be necessary.
2. What's your provincial grid mix?
Converting from gas to electric heat pumps makes sense in provinces with clean grids (BC, Quebec, Manitoba) but could increase emissions in coal-dependent grids.
3. What's the energy baseline?
Start with an energy audit. More than 75% of building emissions come from heating—focus there first.
4. Can you phase the work?
Deep retrofits can be done gradually (e.g., upgrade envelope first, then mechanicals). This spreads costs and reduces upfront barriers.
5. What certifications matter?
- Zero Carbon Building Standard (CAGBC): For zero-carbon operations
- LEED: Energy, water, materials, health
- Passive House, BOMA BEST, ENERGY STAR: Other worth exploring
The TGCC Perspective: Honest Sustainability
To be clear, referring to an annual recycling campaign as a "climate strategy" is greenwashing. Retrofitting, however, is true sustainability. Although retrofits are still expensive, time-consuming, and material-intensive, they are the most viable option for Canadian campuses.
The ridiculousness? Universities make ostentatious promises to be carbon neutral while allowing energy giants from the 1970s to continue spewing emissions because "retrofit is too expensive." Retrofits, however, pay for themselves in years rather than decades, according to the research.
According to Thomas Mueller of the Canada Green Building Council, the construction industry in Canada has a "tremendous opportunity" to influence change. Whether we can afford to refit is not the question. Whether we can afford not to is the question.
Your Next Step
If your institution is weighing retrofit versus rebuild:
- Order an energy audit for the entire building, not just a cursory look
- Determine lifecycle carbon by accounting for both operational and embodied emissions
- Instead of using hypothetical savings, model payback times using actual utility prices
- Speak with colleagues: open case studies are available at the University of Calgary, Dalhousie, and the University of Toronto
TGCC collaborates with post-secondary institutions and student associations to advance sustainability from intention to action. We assist you in deciphering the true expenses, emissions, and decision-making that genuinely promote the UN SDGs on your campus; we don't sell illusions.