If you own or manage a Dutch office building, 2026 is quietly turning into a year in which energy compliance stops being a “nice to have” and becomes a legal gatekeeper. Three separate but connected rules are converging on office owners and operators right now: the long-running Energy Label C obligation, a new building automation mandate, and a redesigned EU-wide energy label. Miss any of them, and in the worst case, you may not be allowed to use your building as an office at all.
For flexible workspace operators, landlords, and anyone managing a portfolio of business centres, this is worth understanding properly, not just to stay compliant, but because it is reshaping which buildings are attractive to lease in the first place.
Energy label C: still the baseline, still widely ignored
Since 1 January 2023, Dutch law has required office buildings larger than 100 m² to hold at least Energy Label C, meaning a maximum primary fossil energy use of 225 kWh per m² per year. The rule sits in the Besluit bouwwerken leefomgeving (Bbl), and municipalities and environmental services have been actively enforcing it since the deadline passed.
The catch is that when the obligation took effect, more than half of Dutch office buildings didn’t meet it. That compliance gap hasn’t closed on its own, and it remains a live enforcement issue in 2026. Buildings that fail to meet the standard risk losing their legal right to be used as office space, a consequence serious enough that it should be on every landlord’s radar and every tenant’s due-diligence checklist before signing a lease.
There are a handful of exemptions: buildings destined for demolition, spaces not meant to be heated or cooled for people, and cases where the payback period for the necessary measures exceeds ten years. These are narrow, though, and owners need to actively demonstrate that they apply.
GACS: a new requirement that took effect this year
Less well known, but equally binding, is that since 1 January 2026, office buildings with heating or cooling systems above 290 kW capacity are required to have a Gebouwautomatiserings- en Controlesysteem (GACS), known in EU terminology as a Building Automation and Control System (BACS).
This isn’t a bureaucratic add-on. A GACS actively monitors and manages a building’s technical systems, and it is a direct implementation of the EU’s push to get large non-residential buildings smarter about energy use, not just compliant with it. For larger office buildings and campuses, the kind that are increasingly common in Dutch business parks and mixed-use developments, this represents a concrete new capital expenditure tied to a compliance deadline that has already passed.
A new energy label format since May 2026, now applying to monuments too
The third change is more subtle but still relevant. As of 29 May 2026, the Netherlands introduced a redesigned energy label, following the revised EU Energy Performance of Buildings Directive (EPBD IV). The new label carries more information, including whether a building meets the renovation standard, and uses icons and pictograms intended to make the practical next steps clearer for owners and tenants alike.
One change stands out for anyone dealing with heritage office buildings. The earlier exemption for protected monuments has been scrapped, so from 29 May 2026 an energy label is now required at sale or lease even for monumental buildings, although the underlying energy performance requirements for monuments remain unchanged for now. Labels issued before that date remain valid; only newly registered labels use the new format.
What this means for flexible workspace operators
None of these three rules were written with coworking or flex operators specifically in mind, but they land squarely on the sector. Flex operators typically occupy or manage larger footprints, often in older buildings being repositioned for shared use, which is exactly the kind of stock most exposed to Label C non-compliance and GACS thresholds.
There’s also a commercial angle. As tenants, corporates especially, grow more attentive to ESG reporting and building performance, a fully compliant, well-labelled building becomes easier to lease and easier to justify internally to a sustainability-conscious procurement team. Buildings stuck below Label C, by contrast, are becoming harder to place and increasingly a liability rather than an asset on a landlord’s books.
For operators evaluating new locations or renewing leases on existing ones, checking a building’s current energy label via EP-online and asking direct questions about GACS status for larger HVAC systems should now be a standard part of due diligence rather than an afterthought left to the legal team.
The bigger picture
None of this is happening in isolation. It is part of a broader EU push, via EPBD IV, toward climate-neutral building stock by 2050, with the renovation standard expected to play a growing role in how that trajectory is tracked and enforced in the years ahead. Energy Label A is not legally mandatory for Dutch offices by 2030, despite what the 2013 energy agreement aspired to, but the direction of travel is unmistakable, and the compliance bar keeps rising in smaller, harder-to-ignore increments.
For office owners and flexible workspace operators, the practical takeaway is simple: don’t wait for a municipality to flag non-compliance. Check your building’s label status now, understand whether GACS applies to your HVAC setup, and factor renovation timelines into any lease or acquisition decision you’re weighing this year.
