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Sustainability is at the heart of everything we do

Sustainability

Sustainability is an integral part of NSI’s long term value creation strategy. Our business model is geared towards owning and developing flexible and adaptive buildings. We invest in decarbonising our portfolio by reducing energy intensity and shifting towards the usage of renewable energy sources, and creating inspiring, flexible working environments articulated around the health and well-being of our occupants.

Our Ambition

The focus of our sustainability efforts is on the environment, as we believe this is where our efforts can make the biggest difference. In line with our strategy, we have shaped our sustainability ambition around three pillars, two of which focus on environmental impact and one on social impact: ‘Future-proof buildings’, ‘Energy and carbon’ and ‘Social engagement’.

Future-proof buildings

We aim to own buildings that are resilient, adaptive and reflect our commitment to best-in-class sustainable building standards.

  1. Own assets that are sustainability-certified.

  2. Strive for a minimum BREEAM “Very Good” rating for assets.

  3. Focus on climate resilience: physical risk assessment with a mitigation plan for every asset.

Energy and carbon

We are committed to aligning our portfolio to a Paris-compliant decarbonisation trajectory and to striving towards net-zero.

  1. We are striving to decrease our energy intensity in line with the 1.5c scenario decarbonisation pathway (as per the CRREM methodology).

  2. All electricity procured by NSI is obtained from renewable sources.

  3. We will offset remaining carbon emissions only after all other financially viable measures have been exhausted.

Social engagement

We strive to have a long-term positive influence on our tenants, employees and communities.

  1. Make health and well-being a priority for our tenants and our employees.

  2. Strive to have a diverse and inclusive workforce.

  3. Giving back to our communities and respect our surroundings.

What we have done in 2025

  • In 2025, we renovated HNK Rotterdam Alexander, which is turned into a highly sustainable asset at an estimated 65kWh/m2 energy intensity, well below Paris-Proof standards. We anticipate an A+++ EPC-label and an ‘Excellent’ BREEAM-NL In-Use ranking.

  • 2025 marked the third year in our journey towards aligning our portfolio with the Paris Climate Agreement targets, and we are satisfied with our reduction in energy intensity over the year. NSI continued to invest in sustainability and to make progress in its ambition to progress on the BREEAM assessment areas.

  • We invested in further decarbonisation of our portfolio, for example, by increasing the total capacity of solar panels across our assets, which increased from a 695 thousand total wattpeak capacity in 2024 to a 1,091 thousand total wattpeak capacity in 2025.

Sustainability certification

  • We are pleased about our 5-star GRESB rating, for a sixth year running, and at a 94 rating we are among the industry leaders.

  • We received our fourth consecutive EPRA sBPR gold award.

  • EPC energy performance certificates by value show that per year-end 2025 96% of labels are A or higher, with an increase in A++ labels and even our first A+++ label.

  • The majority (96%) of the assets in our portfolio has a BREEAM certificate, of which 75% is at least ‘Very Good’.

Sustainability reports (Integrated Annual Reports)