GRESB: the real estate and infrastructure ESG benchmark explained

If your organisation manages real estate or infrastructure assets, the GRESB score is increasingly the number institutional investors look at first when they assess the sustainability of your portfolio. It has become the de facto ESG benchmark for these asset classes, and a weak score can quietly close doors to capital.

GRESB (the Global Real Estate Sustainability Benchmark) is an investor-driven assessment that scores the environmental, social and governance performance of property and infrastructure portfolios and ranks them against their peers. This article explains what GRESB measures, how the assessment is structured, and the practical steps that move your score.

What GRESB is and who uses it

Founded in 2009, GRESB provides standardised, comparable ESG data for real estate and infrastructure investments. Rather than a certification, it is an annual benchmark: participants complete a detailed assessment, receive a score out of 100, and are ranked against comparable funds and assets worldwide.

Its weight comes from the investor side. In the 2025 cycle, around 150 institutional and financial investors (representing some USD 53 trillion in assets under management) used GRESB data to inform investment and engagement decisions, and just over 1,000 fund managers submitted close to 2,400 assessments. For a manager raising or retaining capital, that reach is the reason the benchmark matters.

What the assessment measures

GRESB evaluates performance across several domains, combining management practices with measured outcomes:

• Energy and emissions: energy intensity, efficiency measures, on-site and procured renewables, and greenhouse gas emissions across Scope 1, Scope 2 and, increasingly, Scope 3.
• Water: consumption, efficiency and wastewater management.
• Waste: reduction, reuse and recycling across operations and refurbishment.
• Social and governance: tenant and community engagement, health and safety, diversity, and governance structures.

The assessment is organised around components such as management and policy, performance (measured energy, water, waste and emissions data), and development (the sustainability of new build and major renovation). Data quality is scored throughout, so reliable, well-documented numbers are as important as the underlying performance.

Why investors pay attention

• Risk signal: assets aligned with sustainability tend to be more resilient to climate risk, tightening regulation and shifting tenant demand. A strong GRESB score reads as a lower-risk profile.
• Long-term value: efficient, well-managed buildings typically show lower operating costs and stronger occupancy.
• Regulatory alignment: in Europe, real-asset investors increasingly report under the SFDR and against the EU Taxonomy, while large managers fall within the scope of the CSRD. GRESB data feeds directly into these disclosures.
• Mandate fit: investors with their own ESG commitments prefer portfolios with verifiable, benchmarked metrics.

How to improve your GRESB score

1. Set credible targets: align reduction goals with recognised frameworks such as Science-Based Targets and run environmental management under ISO 14001.
2. Fix your data foundation: GRESB rewards complete, traceable, asset-level data. Reliable measurement of energy, water, waste and emissions is the single biggest lever on the score.
3. Engage the value chain: work with tenants, property managers and suppliers, since much of an asset's footprint sits outside your direct control.
4. Invest in efficiency: LED retrofits, smart HVAC and improved building envelopes often deliver quick, measurable gains.
5. Add on-site renewables: solar, heat pumps or other low-carbon systems cut both emissions and operating costs.
6. Be transparent: disclose ESG metrics publicly and consistently year on year. GRESB explicitly rewards demonstrable improvement over time.

Pitfalls to avoid

• Greenwashing: marketing sustainability without measured action is exposed by GRESB's evidence and validation requirements, and, in the EU, increasingly penalised by anti-greenwashing rules.
• Poor data quality: gaps and estimates lower both the score and investor trust.
• Treating it as one-off: GRESB is a year-over-year benchmark; stagnation shows.
• Neglecting the S and G: social engagement and governance carry real weight, not just environmental metrics.

GRESB in the wider ESG landscape

GRESB is not the only benchmark. The CDP (Carbon Disclosure Project) and various index providers also rate corporate sustainability. What sets GRESB apart is its specialisation: for real estate and infrastructure it is the reference point, and a strong score usually complements good performance across other ratings, giving investors a coherent picture of your portfolio.

From score to strategy

A strong GRESB score is the output of good data and genuine performance, not a reporting exercise bolted on at year-end. The portfolios that improve fastest are those that measure continuously, trace every figure to source, and act on what the data shows.

That is exactly where a dedicated platform helps: Manglai connects your consumption and emissions data, keeps it audit-ready, and turns it into the asset-level evidence GRESB and your investors expect. Explore Manglai's carbon footprint solution to build the data foundation behind a better score.