In the past, carbon emissions were often viewed as an ESG reporting item rather than a driver of financial value. That is no longer the case. As regulations tighten, lenders get stricter, and tenant preferences evolve, a building’s carbon performance is now directly influencing its market valuation.
The shift is clear: sustainable buildings can command higher rents and stronger capitalisation rates, while inefficient ones risk accelerated depreciation. In valuation terms, this means a “green premium” for high-performing assets - and a “brown discount” for those that fail to keep up.
The “brown discount” describes the loss in value experienced by assets with poor environmental performance. This isn’t just about higher utility bills. It’s the combined effect of higher financing costs, reduced tenant demand, and looming retrofit obligations.
Studies are beginning to quantify the impact. JLL’s Return on Sustainability report found that inefficient assets can suffer a 5–15% drop in valuation in markets with active minimum energy performance standards (MEPS). As disclosure frameworks like the EU’s CSRD and the SEC’s climate rules make carbon data more transparent, the market’s ability to price in these risks will only grow.
On the flip side, buildings with strong carbon credentials - whether through operational efficiency, renewable integration, or verified certifications - are attracting what’s known as the “green premium.”
Assets in this category can see 6–12% higher rents and enjoy faster lease-up rates. Tenants are willing to pay more for lower operating costs, healthier spaces, and alignment with their own ESG goals. For investors, these assets also tend to have lower vacancy risk and stronger resale values.
The green premium and brown discount are not just abstract concepts - they’re active forces shaping investment returns. For portfolio managers, this creates a strategic imperative: understand your exposure to both sides of the equation and plan accordingly.
This means mapping your assets against credible carbon performance pathways, assessing retrofit needs, and sequencing interventions in a way that maximises both compliance and value creation. With tools like Optiml’s decision-intelligence platform, you can simulate how retrofit scenarios impact carbon, operating costs, and long-term asset value - all in a single view.
Carbon performance is now inseparable from financial performance. The winners in the coming decade will be those who act early to capture the green premium - and avoid being trapped by the brown discount. In this new valuation reality, sustainability is no longer a “nice-to-have.” It’s a financial lever.
