EU CSRD and Buildings in 2026: Scope, ESRS E1, and the Omnibus Reset

The Corporate Sustainability Reporting Directive (CSRD) is still the most consequential sustainability rulebook affecting real estate portfolios with European exposure, but the version you need to plan around in 2026 is not the one written in 2022. The European Commission requires large and listed companies to report on the environmental and social risks they face and the impact their activities have on people and the environment. For a building owner or operator, that means measured energy use, emissions across Scope 1, 2 and 3, and the underlying data quality behind every figure. The 2025 and 2026 legislative changes narrowed who has to report and simplified what they report, but they did not remove the core obligation to produce audit-ready, whole-building energy and emissions data.

If your parent company sits outside the EU but your portfolio, tenants, or subsidiaries operate inside it, the questions are the same: are we in scope, when do we report, and can our building data survive assurance. This article walks through scope, the phased timeline, the ESRS E1 climate standard, double materiality, and where the Omnibus package stands as of August 2026.

Who is in scope after the Omnibus

The original CSRD pulled in roughly 50,000 companies across several categories: large EU companies, listed small and medium enterprises, and certain non-EU parents with EU activity. The Omnibus I simplification package, which the Council of the EU signed off on 24 February 2026, cut that population sharply. The revised scope focuses the directive on the largest companies, generally those with more than 1,000 employees and more than EUR 450 million in net annual turnover. According to the Commission and Council materials, this removes the large majority of companies that the earlier text would have captured.

Non-EU parent companies are not off the hook. Under the third-country provisions, a company headquartered outside the EU can still be caught where it generates substantial net turnover inside the EU (the Omnibus raises the EU-turnover trigger to EUR 450 million) and has an EU subsidiary or branch above the relevant thresholds. If you run a North American or Asian real estate group with meaningful European operations, you should test scope against your consolidated EU turnover and your local entity footprint rather than assuming a non-EU headquarters exempts you.

Two points matter for planning. First, thresholds are tested at the level of the undertaking or group, so a portfolio held through several EU entities may aggregate above the line even where no single building company looks large. Second, being out of mandatory scope does not remove reporting pressure. Banks, insurers, and larger tenants that remain in scope will still ask for building-level energy and emissions data to complete their own value-chain disclosures, which is the Scope 3 problem discussed below.

The phased timeline and the stop-the-clock delay

CSRD application was always phased. The first wave of very large public-interest entities applied the rules for financial year 2024, publishing in 2025. The stop-the-clock directive, adopted in April 2025, postponed the later waves by two years to relieve companies that had not yet started. The Omnibus then reshaped who those later waves even contain. In practical terms, many companies that expected to report for financial year 2025 or 2026 now have a first application year of financial year 2027, with first reports published in 2028, once national transposition is complete.

The gap between now and a 2027 first application year is not idle time. Assurance is required from the outset, and assurance is where thin or inconsistent building data fails. Meter reads that jump when a tenant changes, invoices booked to the wrong cost centre, and estimated bills that were never trued up all surface during limited assurance testing. The organisations that clear assurance cleanly are the ones that spent 2026 fixing their data pipeline rather than drafting narrative.

ESRS E1: energy and emissions are the core

Companies in scope report under the European Sustainability Reporting Standards (ESRS), developed by EFRAG and adopted by the Commission as delegated acts. ESRS E1, the climate change standard, is where building operators spend most of their effort. Two disclosure requirements sit at the centre: energy consumption and mix, and gross greenhouse gas emissions across Scope 1, 2 and 3 plus total GHG. Everything else in E1, from transition planning to financial effects of climate risk, depends on the quality of those underlying numbers.

Energy consumption and mix

The energy disclosure asks for total energy consumption split between fossil, nuclear, and renewable sources, and, for many entities, energy intensity per unit of revenue. For a building portfolio, that means reconciling electricity, natural gas, district heating and cooling, and any on-site generation across every asset, then classifying each stream correctly. This is a data reconciliation problem before it is a reporting problem: the same building may have multiple meters, multiple suppliers, and billing periods that do not line up with the financial year.

Scope 1, 2 and 3 emissions

ESRS E1 requires gross Scope 1 (direct combustion, such as gas boilers), Scope 2 (purchased electricity, heating and cooling), and Scope 3 (value-chain emissions). For real estate, Scope 3 is usually the largest and the hardest, because it includes tenant energy use in leased assets and embodied emissions. The amended ESRS that EFRAG advanced through its 2025 technical advice keeps the Scope 1/2/3 architecture but adds flexibility where value-chain data is genuinely hard to obtain, and trims some redundant data points. The direction of travel is fewer mandatory metrics, not weaker emissions accounting.

The renumbering between the originally adopted ESRS E1 and the simplified draft has caused some confusion. Focus on the substance: energy consumption and mix, and gross Scope 1, 2 and 3 emissions with total GHG, remain the load-bearing disclosures whatever the final paragraph numbers turn out to be when the Commission adopts the revised delegated act.

Double materiality, kept intact

One thing the Omnibus did not remove is double materiality, the principle that sits under the whole framework. Companies assess sustainability topics from two directions: impact materiality, meaning how the business affects people and the environment, and financial materiality, meaning how sustainability matters create risks and opportunities for the business itself. A topic is reportable if it is material from either angle.

• Impact materiality: a building portfolio's energy use and emissions affect the climate, which is an outward impact regardless of financial consequence.
• Financial materiality: carbon costs, energy price volatility, retrofit capital needs, and stranding risk all feed back into asset value and cash flow.
• Either lens can trigger disclosure, which is why energy and emissions data is almost always material for real estate.

For building owners the practical consequence is simple. Climate is virtually always material under one lens or both, so E1 energy and emissions disclosure is not something you can screen out with a materiality assessment. The assessment shapes what else you report; it rarely lets a real estate company avoid E1 itself.

Where the Omnibus stands in 2026

As of August 2026 the position is settled at the directive level and still moving at the standards level. The Omnibus I directive was approved by the European Parliament on 16 December 2025, adopted by the Council on 24 February 2026, and entered into force in March 2026. Member states then transpose the changes into national law, which is where the exact application dates for your specific entities are confirmed. The revised ESRS, based on EFRAG's technical advice delivered at the end of 2025, are expected to be adopted by the Commission as a delegated act around mid-2026.

The strategic read for real estate: scope is narrower, mandatory data points are fewer, timelines for later waves are later, but the energy and emissions core is intact and assurance still applies. Companies that treat the delay as a reason to stop preparing will meet the same data problems in 2027 with less runway.

How MartinAI helps

Most CSRD building programmes stall on the same thing: getting trustworthy energy and emissions numbers out of utility bills, meter exports, and supplier statements that were never designed for reporting. MartinAI turns that raw material into clean, validated, whole-building data ready for ESRS E1. The platform reads utility bills and interval data, normalises units and billing periods to the financial year, flags estimated reads and gaps, and reconciles multiple meters and suppliers per asset so a building's total consumption is complete rather than approximate.

From that validated base, MartinAI structures energy consumption and mix and calculates Scope 1 and Scope 2 emissions with the factors and methods your assurance provider expects, keeping the audit trail from invoice line to reported figure. For Scope 3 in leased assets, it consolidates tenant and whole-building energy so the value-chain picture rests on measured data rather than crude estimates. The result is a reporting pipeline where the numbers are traceable end to end, which is exactly what limited assurance tests. No manual spreadsheet reconciliation, no orphaned meters, and a clear line back to source for every figure.

Conclusion

The Omnibus reset changed who reports and trimmed what they report, but it did not change what good looks like for a building portfolio: complete, validated, whole-building energy and emissions data that an auditor can trace to source. Whether your first application year is already here or lands in 2027, the winning move in 2026 is to fix the data pipeline now. Scope and standards will keep shifting at the margins. Clean building data is the durable asset underneath all of it.