SECR and CSRD — what UK companies with EU subsidiaries need to know

SECR and the EU's Corporate Sustainability Reporting Directive (CSRD) are different regimes with different scopes — but a UK group with EU operations can find itself dealing with both. This post explains where they overlap, where they diverge, and how to reuse work rather than running two parallel exercises.

The question

If your UK parent files SECR and you also have a subsidiary established in the EU, do you face CSRD as well — and if so, can the carbon work you already do for SECR be reused?

How the two regimes compare

Dimension	SECR	CSRD
Jurisdiction	UK	EU
Where it sits	Directors' report	Management report (EU)
Core emphasis	UK energy use, scope 1 and scope 2	Broad sustainability ("double materiality"), incl. scope 3
Assurance	Not separately mandated	Assurance required (phased)
Scope/timeline	Established UK regime	Evolving — subject to EU 'omnibus' simplification; confirm the current phased timeline before relying on dates

Why it matters

The carbon calculation underneath SECR — activity data, DEFRA factors, scope 1 and 2 — is a strong foundation for CSRD's climate disclosures. But CSRD asks for more: scope 3 across the value chain, double-materiality assessment, and assurance-ready evidence. Treating SECR as the first layer of a CSRD-ready data system avoids rework.

For the scope 3 groundwork CSRD will expect, see our scope 1, 2 and 3 emissions guide.

How to avoid duplicating work

1. Build one central activity-data set that serves both regimes.
2. Extend your SECR scope 1/2 methodology into a full scope 3 screening for CSRD.
3. Document methodology to an assurance standard from the start.

Common mistakes to avoid

• Assuming Brexit removed all EU reporting exposure — an in-scope EU subsidiary can still pull a UK group in.
• Running SECR and CSRD as two disconnected projects.

Need help mapping your obligations across both regimes? Book a 15-minute call or see the SECR reporting service — £3,500 fixed fee, 21-day audit-ready guarantee.