CSRD (Corporate Sustainability Reporting Directive) rules shape EU sustainability reporting, ESRS (European Sustainability Reporting Standards), double materiality, UK company exposure, evidence files and assurance readiness. Start here if you need to understand what CSRD now requires, what changed in 2026, and what a proportionate preparation plan looks like.
Start here
Read the main CSRD explainer first, then move to the UK companies guide and ESG (environmental, social and governance) reporting framework comparison. If you are already preparing evidence, go straight to the ESG data room checklist and due diligence checklist.
CSRD guides to read first
| Guide | Best for | What it helps you understand |
|---|---|---|
| CSRD explained: complete 2026 guide | Founders, finance teams, ESG leads and advisers | Scope, Omnibus changes, ESRS, double materiality, UK exposure, assurance and readiness steps. |
| CSRD for UK companies | UK businesses with EU activity | When EU rules can still matter for UK groups, subsidiaries, branches and suppliers. |
| ESG reporting frameworks compared | Reporting and compliance teams | How ESRS, ISSB (International Sustainability Standards Board), GRI (Global Reporting Initiative), TCFD (Task Force on Climate-related Financial Disclosures) and SASB (Sustainability Accounting Standards Board) differ and where they overlap. |
| ESG data room checklist | Operators, finance teams and scale-ups | Which policies, metrics, evidence, controls and source documents to gather. |
| ESG due diligence checklist | Investors and acquirers | How ESG evidence connects to transaction risk, controls, compliance and greenwashing. |
| UK SRS and IFRS S2 climate disclosures | UK climate disclosure readers | How UK sustainability reporting may align with international climate disclosure standards. |
| Double materiality assessment guide | Reporting leads and advisers | How to assess impact and financial materiality under ESRS and document the decision trail. |
| CSRD gap analysis checklist | Companies moving from awareness to implementation | How to identify missing data, weak controls, unclear owners and assurance gaps. |
| ESG assurance explained | Finance, audit and sustainability teams | The difference between limited and reasonable assurance and what evidence providers may test. |
| Sustainability reporting software | Teams assessing tools and vendors | What UK companies should check before buying reporting or carbon accounting software. |
| Scope 3 supplier data collection | Procurement and sustainability teams | What to ask suppliers for and how to assess data quality without overclaiming. |
Why CSRD matters
CSRD is not just another ESG acronym. It changes how sustainability information is scoped, evidenced, controlled and assured. The rules have also changed enough that many older CSRD explainers are now incomplete or misleading. A business needs to know both the original direction of travel and the latest simplification changes.
The practical challenge is evidence. Reporting teams need to move from narrative sustainability updates to structured, auditable information across climate, environment, workforce, value chain, governance and business conduct topics. That means policies, data owners, methodology notes, controls, board oversight and repeatable reporting processes.
Core CSRD questions
- Is the company directly in scope under the latest thresholds?
- Could it be indirectly affected through EU customers, investors, subsidiaries or branches?
- Has it completed a documented double materiality assessment?
- Which ESRS topics are material and which are not?
- Who owns the underlying ESG data?
- Which metrics are measured, estimated or unavailable?
- Can the company evidence policies, controls, governance and sign-off?
- How does climate disclosure connect to Scope 1, 2 and 3 emissions?
CSRD evidence map
| Evidence area | Why it matters | Useful next guide |
|---|---|---|
| Scope and group structure | Determines whether direct reporting duties apply. | CSRD for UK companies |
| Double materiality | Determines which ESRS topics require detailed disclosure. | Double materiality guide |
| Climate and emissions data | Supports ESRS E1 and customer Scope 3 requests. | Scope 3 guide |
| Policies and controls | Supports assurance and repeatability. | ESG assurance explained |
| Investor and buyer diligence | Turns reporting weakness into commercial risk. | ESG due diligence checklist |
Bottom line
CSRD readiness is not just about writing a report. It is about knowing whether you are in scope, understanding what changed in 2026, and building evidence, governance and repeatable data processes that can stand up to scrutiny.