Sustainability in real estate portfolios: The financial imperative.

What do investors consider when investing in real estate? Location? Yes. Market conditions? Surely. Cash flow? Perhaps. There’s another key consideration that savvy investors are catching on to – sustainability. And no, it’s not just a trendy buzzword; it’s the difference between a thriving asset and a money pit.

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The environmental performance of a real estate asset has become a key priority for future-savvy investors who understand that it's pivotal to the asset's financial performance and safeguards it from risks. However, not all investors are quite there yet with their portfolios. In a global study by law firm BCLP, investors estimated that, on average, 11% of their current real estate portfolio is at risk of becoming unsaleable because it fails to meet sustainability criteria. That's not a rounding error – it's real money quietly going stale.

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It goes to show that the sustainability of buildings is directly linked with their profitability, and there are multitudes of reasons behind that, which we'll discuss in detail.

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In real estate, sustainability is the new black

The built environment is responsible for a jaw-dropping 42% of annual global CO2 emissions. The embodied emissions – from making the concrete, steel and aluminium in the first place – add another 15%. Clearly, the real estate sector has a huge part to play when it comes to fighting the climate crisis. But it's not just a matter of doing the right thing – it's also a matter of doing the required thing, aka, compliance.

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Regulations around real estate's carbon footprint have tightened like a landlord's grip on rent day. Governments are making it clear – if your building guzzles energy like a gas-guzzling SUV from the '90s, you're going to pay for it.

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Secondly, investing in energy-efficient properties provides a solid way for investors to meet their sustainability goals (which may have sprung from increasing regulation). And it's not lost on investors that climate pledges are great for optics.

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Caring about sustainability in real estate investments helps secure assets from climate-related risks. Properties with too big of a carbon footprint risk becoming stranded, and may even become the target of penalties as governments toughen their stance on emissions.

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But there's another, equally pressing reason why real estate owners can't afford to ignore sustainability: financing. Banks are now under real regulatory pressure of their own. The EU's banking rules – the CRR III and CRD VI package that has replaced the old CRD IV regime – now require lenders to manage climate and ESG risk head-on, right down to their property lending.

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That means banks must be more cautious about where they lend their money – especially in real estate. If investment firms want financing to acquire properties, they need to prove those assets won't become stranded due to poor environmental performance. Otherwise, banks may see them as too risky to fund.

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All of the above factors have made sustainability one of the top three considerations of real estate investors. 

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Changing consumer incentive

Of course, we can't forget the consumer – in this case, the tenants. Consumers, in general, are becoming more inclined to consider sustainability in their purchases. That also extends to their decisions of where to live and where to set up their businesses.

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Let's be real – your property isn't making money if it's sitting empty. And tenants these days want buildings that don't cost a fortune to heat in winter or feel like an oven in summer. If your property's energy efficiency rating looks like a bad exam grade, don't be surprised when tenants start ghosting you.

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Consider what tenants are already telling the market. In that same BCLP study, 79% of corporate occupiers said that by 2030 a building's sustainability will be the most important factor in their rental decision – full stop. That's your future demand pipeline talking. Tenants know a good Energy Performance Certificate (EPC) rating means lower bills and a smaller footprint, and rising energy costs have only sharpened the point.

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Properties with poor environmental performance risk losing tenants, which may result in low occupancy or downright long periods of vacancy. That means poor cash flow and overall dismal financial performance. Inefficiencies in energy and water usage may also lead to a lower valuation, which means properties may not necessarily sell at a profit.

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So, between tenants demanding sustainability and banks making it a prerequisite for financing, real estate owners are feeling the squeeze from both ends. If you want tenants to fill your buildings and banks to keep financing them, sustainability isn't just a "nice to have" – it's a non-negotiable.

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The dangers of inaction from property owners or investors

If you're a real estate investor, it's time you re-evaluated your investment strategy (if sustainability is still not your priority). Ignoring sustainability in your real estate portfolio is like playing Monopoly and refusing to buy properties – it won't end well. You might get away with it for a little while, but sooner or later, you'll find yourself bankrupt … or worse, stuck with properties nobody wants.

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Here’s why the time to take action is now:

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Not risk averse to climate change

The climate crisis in itself is a risk, and taking sustainability measures safeguards assets from it. For example, water shortage is a big risk, especially in urban centres with water scarcity. Excessive usage of water may lead to shortages that can hamper the quality of life for the occupants.

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Similarly, as cities grow and energy consumption increases, the local grid may be stressed. That's also a climate-related risk. With energy efficiency or on-site renewable energy production, the overall consumption and its impact on the grid can be reduced, averting the risk of becoming the victim of rolling blackouts.

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Non-compliance/fines

Regulations are targeting the real estate sector as well. And non-compliance isn't really an option. It's bad for the asset and the holder's reputation and risks financial penalties, which can impact the bottom line.

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The European Union (EU), for instance, has ambitious plans for the building sector. Its Energy Performance of Buildings Directive – recast in 2024 – commits the bloc to a zero-emission building stock by 2050 and sets minimum energy performance standards that force the worst-performing buildings to improve first. (More on what that means for your balance sheet in a moment.)

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Other countries are tightening the screws too. In the UK, the current minimum is an EPC rating of E to let a commercial property, and the government has set out plans to push larger non-domestic buildings up to an EPC B by 2031. The exact dates are still being written into law, but the direction of travel is unmistakable.

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Stranded assets

Worst-case scenario? Your property could end up as the real estate equivalent of a flip phone – outdated, unwanted, and impossible to sell. If your building isn't up to sustainability standards, don't be shocked when tenants and buyers swipe left.

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Stranded assets become the investor or owner's liability. They won't produce income and will lose value, possibly selling at a loss or not at all. As the saying goes, it's better to be safe (as houses) than sorry.

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EPCs aren't paperwork anymore – they're a finance metric

For years, an Energy Performance Certificate was a form you filed and forgot. That era is over – and the reason is worth understanding, because it's now shaping what your buildings are worth and who will lend against them.

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The EU recast its Energy Performance of Buildings Directive in 2024, and it turns the EPC from a dusty snapshot into a policy lever. A few changes should be on every owner's radar:

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• A harmonised A–G EPC scale across the EU, so a rating means the same thing in Copenhagen as it does in Madrid
• Minimum energy performance standards that target the worst-performing non-residential buildings first – the bottom 16% have to improve by 2030, the bottom 26% by 2033
• A legally binding goal of a zero-emission building stock by 2050, with all new buildings zero-emission from 2030 (public ones from 2028)

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And this isn't a someday problem. The deadline for EU countries to write the recast into national law was 29 May 2026. Most missed it – so in July 2026 the European Commission opened legal proceedings against all 27 member states, Denmark included. In plain terms: the rules are landing, and governments are now under pressure to enforce them.

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Here's the part that should get a CFO's attention: your EPC now sits on the bank's desk.

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Lenders aren't watching from the sidelines anymore. The EU's banking rules have moved on from the CRD IV era to the CRR III and CRD VI package, and from January 2026 banks have to manage climate and ESG risk directly – including factoring a building's energy performance into the value of the collateral behind a loan. The European Banking Authority's guidelines say so in black and white. A poorly performing building is simply a riskier loan.

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You can already see it in the numbers. The market has started pricing energy performance into rents and valuations – a "green premium" for efficient buildings and a "brown discount" for the laggards. A weak EPC doesn't just risk a fine somewhere down the line. It can mean a lower valuation today, rent you can't charge tomorrow, and financing terms that quietly get worse.

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This is why we think of an EPC as a business case, not a compliance chore. Improving a rating pays back four ways: a higher asset valuation, better financing terms, higher achievable rent, and lower energy bills. The carbon savings are the bonus.

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But none of it works without accurate data. You can't improve – or prove – what you can't measure, and a static certificate stuffed with national averages won't hold up when the regulator, the bank, and the buyer are all doing the maths.

What can you do to make real estate more sustainable?

Making a portfolio greener takes more than good intentions. Here's where to start:

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Make sustainability a priority for all new investments

• Integrate sustainability criteria into your investment strategies
• Prioritise projects that incorporate green building principles and renewable energy solutions
• Conduct thorough environmental impact assessments
• Consider the long-term effect of the property on the surrounding environment
• Set measurable goals for energy reduction, carbon emissions, and waste management
• Ensure these targets align with industry best practices and evolving sustainability standards
• Collaborate with developers with a proven track record of creating environmentally responsible buildings
• Seek out partnerships that emphasise innovation and the use of sustainable technologies

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Audit current assets for environmental performance

• Conduct comprehensive energy audits with professional companies that assess the energy performance of a property
• To monitor energy use in real time, use technology like building management systems and smart meters
• Assess water usage and waste management
• Identify opportunities to reduce water consumption through efficient fixtures and landscaping
• Implement waste reduction and recycling programmes
• Evaluate building materials for new constructions, renovations, and additions
• Determine if harmful building materials are present and make a plan to remove them or offset them
• When making repairs or renovations, choose eco-friendly materials

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Invest in improvements that make current assets more sustainable

• Find the areas where you can improve resource efficiency, and work out the return – energy cost cuts, for example
• Invest in energy-efficient HVAC systems, lighting, and insulation
• Where possible, embrace renewable energy systems, such as solar panels and geothermal heating
• For water conservation, install low-flow fixtures, rainwater harvesting systems, and drought-resistant landscaping
• Enhance indoor environmental quality (this one's growing in importance nowadays)
• Improve ventilation, air filtration, and natural lighting
• Install smart building technology that optimises the building's performance
• Consider deep retrofitting older buildings to bring them up to modern, sustainable standards

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Keep track of legislative changes

• Dedicate personnel to stay on top of regulations and to monitor evolving environmental regulations and building codes
• Ensure that your portfolio complies with all applicable sustainability requirements
• Participate in industry forums and associations to stay informed of emerging trends and best practices
• Advocate for policies that promote sustainable real estate development

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Consider green certifications for your assets

• Apply for green building certifications, such as LEED, BREEAM, or NABERS, after completing their requirements
• Use the green certification to boost property value, attract tenants, and improve reputation
• Highlight your green building certifications in marketing materials and investor reports
• Showcase your commitment to sustainability to stakeholders and the public
• Maintain and improve the buildings to continuously meet the standards required by the certifications

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Sustainable real estate will be profitable real estate

Sustainability isn't just a box to tick on a compliance checklist – it's your golden ticket to a future where your buildings are worth more, not worthless. The sooner you embrace it, the sooner you stop bleeding money on inefficiencies. It's an opportunity to make real estate assets cost-effective, resource-efficient, and liveable.

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Banks are watching. Tenants are watching. Regulators are watching. And if your property isn't keeping up, you might find yourself stuck with a building nobody wants to live in, buy, or finance. In the very near future, demand for green buildings will soar, meaning sustainability will play a big role in the profitability of properties.

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That's where comundo comes in. We build the energy-data infrastructure that connects directly to your utilities – electricity, district heating, water, gas – so you work from real, verified consumption data instead of estimates and national averages. On top of it, we deliver dynamic EPC services: a live picture of how every building is performing, what to fix next, and proof it worked. No hardware. No spreadsheets. Just the accurate data you need to defend a valuation, secure financing, and keep your buildings out of the stranded-asset pile.

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It's your data, under your control.