How does decarbonisation affect commercial property valuations?

Understanding the ‘grey discount’

The market is not only rewarding greener buildings; it is also penalising inefficient assets. Building owners and valuers are increasingly encountering a phenomenon known as the ‘grey discount’. That refers to the market devaluation of commercial properties with poor energy performance, high carbon emissions or outdated infrastructure. 

Put simply, buildings that underperform in sustainability are receiving lower valuations than comparable low-carbon assets. That reflects the higher operational costs, regulatory risks and investment required to bring them up to modern standards. 

The impact of EPC rating changes on commercial property value 

Energy Performance Certificate (EPC) ratings are becoming a key driver of commercial property value as regulatory standards tighten and demand for sustainable spaces grows. 

Analysis of the London office market shows that each EPC band increase (e.g., from ‘D’ to ‘C’) is associated with 4.2% increase in rental income and a 3.7 % rise in capital value. That highlights investor and tenant willingness to pay a premium for more energy‑efficient buildings.

The consequences are also clear for properties that lag behind. Research suggests that the more than 19,000 commercial properties in England and Wales that do not meet the current Minimum Energy Efficiency Standards (MEES) (that’s those with an EPC rating of ‘F’ or ‘G’) could lose more than £1 billion in collective rental income. 

And with proposals to raise the MEES to a rating of ‘C’ over the next few years, the number of commercial buildings hit by the grey discount looks set to grow. Currently, an estimated 80% of offices, warehouses and shops in England’s major cities have an energy performance rating below the proposed minimum level. That suggests a significant proportion will require urgent upgrades or risk facing a growing valuation penalty. 

How decarbonisation drives property values

The net-zero transition is no longer just an environmental imperative. It has financial implications reflected in pricing, leasing performance and investment decisions across the market. These are the key areas where value is won and lost.

Operational costs and net income

Energy consumption is often the largest controllable expense for many commercial properties, and efficiency improvements can directly impact net income.

Higher valuations: Properties that have undergone decarbonisation strategies, such as retrofitting energy-efficient HVAC systems or installing renewable energy sources, generally have lower operational costs than comparable less efficient properties. Those lower costs boost net income, which is a significant factor in commercial property valuations. 

Lower valuations: Properties with inefficient systems typically have higher operating costs, which can erode net incomes and negatively impact property valuations. It also leaves buildings more susceptible to rising energy prices and carbon taxes or levies. 

Market perception and tenant demand

Growing ESG compliance among UK organisations is reshaping demand for commercial space, with energy-efficient buildings increasingly commanding stronger valuations.

Higher valuations: Energy-efficient, low-carbon buildings help corporate occupiers meet their net-zero targets while showcasing sustainability to customers, investors and regulators. These buildings often command a premium, attract high-quality tenants and experience shorter void periods.

Lower valuations: Owners of energy-inefficient properties often struggle to attract quality tenants, as higher operating costs and poor market perception make them less desirable. As a result, landlords may have to cut rents or offer incentives, which can reduce income and weaken cash flows. 

Financing and lending decisions

Banks and institutional investors now integrate ESG compliance considerations into their investment decisions, which can have a knock-on effect on property valuations. 

Higher valuations: More sustainable properties are easier to lease, better aligned with MEES requirements and more resilient to the grey discount. That lower risk allows lenders and financing providers to offer more favourable rates, reducing financing costs, boosting returns and increasing property values.

Lower valuations: The opposite is often true for properties that do not meet energy performance targets. They often face stricter loan-to-value ratios, higher interest rates and even lending refusals. That can impact investor returns and property prices. 

Long-term resilience

Decarbonising your portfolio can futureproof your assets against rising energy costs, tightening carbon regulations and evolving tenant expectations.

Higher valuations: Landlords and owner-occupiers who invest in low-carbon technologies and high-performance building fabrics position themselves to remain competitive, compliant and resilient as regulatory standards tighten and market expectations evolve. That can lead to higher valuations and stronger tenant demand. 

Lower valuations: As the net-zero transition progresses, properties that fail to adapt will experience longer void periods, declining rental income and decreasing market relevance. That will also have a direct and significant impact on market valuations.   

Retrofitting challenges

Retrofitting buildings to meet modern energy standards can be complex, but the longer you wait, the more difficult it becomes to implement improvements in a planned and cost-effective way.

Higher valuations: Strategic, phased decarbonisation efforts combined with careful financial planning can mitigate the risks associated with retrofitting older buildings. Taking advantage of decarbonisation grants and green tax incentives can reduce costs, protect net income and support higher valuations.  

Lower valuations: Retrofitting older buildings can be costly and complex due to structural constraints, heritage protections and integration challenges. However, delaying upgrades only drives up costs, heightens regulatory risk and puts downward pressure on valuations. 

Regulatory pressure and compliance

ESG compliance is no longer just a reputational consideration. In the UK property market, stricter energy-efficiency regulations also make it a legal requirement and a key financial consideration.

Higher valuations: Properties that meet or exceed the current and proposed MEES thresholds are generally viewed as lower-risk assets. They require less immediate capital expenditure to remain compliant, making them more attractive to buyers, lenders and tenants. That makes them better positioned to protect and even enhance their market value.

Lower valuations:  By contrast, buildings with an EPC rating below current or proposed minimum levels face growing regulatory and financial risks. Owners may have to undertake significant retrofit works to remain lettable, and uncertainty about future compliance costs can deter buyers and occupiers and reduce a property’s market appeal.

Turn decarbonisation into a commercial advantage

Given the direct impact of EPC rating changes on commercial property value and the ongoing net-zero transition, decarbonisation is becoming critical for commercial property owners. Taking proactive steps now can help control future operational and compliance costs, strengthen tenant demand and protect long-term asset performance.

At BTG Eddisons, we conduct detailed energy audits to identify where you can make cost-effective efficiency improvements across your portfolio. Our decarbonisation specialists then develop and deliver a tailored strategy to help you improve EPC ratings, reduce energy costs and protect long-term asset value. Please get in touch to discuss your decarbonisation goals with our team.