Not long ago, sustainability in commercial property was a "nice to have" , good for the brochure, but rarely a dealbreaker. That's no longer the case. In 2026, energy efficiency has become one of the clearest signs of whether a building will hold its value or quietly fall behind.
The market now talks about a "green premium" for high-performing buildings and a "brown discount" for those that don't keep up. Here's what's driving it and what it means for you.
What is the green premium?
Simply put, it's the extra value that flows to buildings with strong environmental credentials, through higher rents, stronger capital values, and faster lettings. That performance is usually evidenced by EPC ratings, BREEAM certification, and increasingly NABERS UK, which measures how a building actually performs in use rather than just on paper.
Why efficiency now drives value
Regulation sets the floor. Minimum Energy Efficiency Standards (MEES) keep raising the bar for what can legally be let. Buildings that can't be economically upgraded risk becoming unlettable and lose value fast.
Occupiers want green space. With their own net-zero targets to hit, tenants increasingly filter out anything below standard. Efficient buildings also help them cut running costs and attract staff.
Lower running costs support higher rents. Cheaper energy bills and service charges mean landlords can charge more while keeping the tenant's total cost competitive.
Investors price in future risk. A building needing major work to stay compliant carries hidden future costs, and that gets baked into a lower price today.
Better buildings keep better tenants.
Green buildings don't just command higher rents — they hold onto occupiers. Tenants stay longer, landlords offer fewer incentives, and income becomes more stable. It's a virtuous circle: great buildings attract great tenants, who stay, which supports value.
The stranded asset risk
The flip side is real. Older, inefficient stock risks becoming a stranded asset, economically obsolete because it can't meet expectations without disproportionate spend. For those owners, the choice is usually retrofit, repurpose, or sell. Doing nothing is increasingly the most expensive option.
A few practical steps
Benchmark your portfolio against current and upcoming MEES requirements.
Prioritise quick-win retrofits (LED lighting, insulation, smart controls, efficient HVAC.)
Focus on how the building performs in use, not just its design rating.
Use green leases to get landlord and tenant on the same page.
The takeaway
The green premium isn't a theory anymore, it's a structural feature of the market. In a world where capital is picky, and buyers reward quality, sustainability has become a key factor in which buildings thrive. Upgrading costs money, but standing still costs more.