SECR Reporting Requirements for Medium Companies: What You Actually Need to Do

Most medium-sized UK companies sailing close to the SECR threshold underestimate how quickly they cross it. Two of three criteria trigger the obligation: 250 employees, £36 million turnover, or £18 million balance sheet. If your company meets any two in the current and preceding financial year, you’re reporting energy and carbon in your directors’ report. No grace period, no soft landing.

The Streamlined Energy and Carbon Reporting framework became mandatory in April 2019, but enforcement has ramped up considerably since 2022. Companies House now flags non-compliant accounts, and regulators increasingly link SECR gaps to wider governance failures. If you’re a finance director at a medium company, this isn’t a sustainability issue you can park with the facilities manager.

Who Qualifies as a Medium Company Under SECR

Medium companies are defined by the Companies Act 2006 thresholds. You qualify if you meet at least two of these three tests: more than 250 employees, turnover exceeding £36 million, or a balance sheet total above £18 million. The employee count includes full-time equivalents across UK and overseas operations, though only UK energy consumption must be reported under SECR.

The two-year rule matters. You need to meet the thresholds in both the current financial year and the one immediately before it. That provides a buffer if you’ve had a growth spike, but it also means you can’t ignore compliance planning once you’re close. If your turnover jumped from £32 million to £40 million, you’ve got one year to build your SECR process before the first disclosure hits your next directors’ report.

Quoted companies and large unquoted companies (turnover above £36 million and more than 250 employees) have more onerous requirements, including Scope 3 emissions where practical. Medium companies get a simpler regime: UK energy use, associated emissions, and an intensity metric. That’s still more work than most medium businesses currently do, but it’s achievable without hiring a dedicated carbon accountant.

Mandatory Disclosures in Your Directors’ Report

SECR requires four elements in the directors’ report: total UK energy consumption in kilowatt-hours, associated greenhouse gas emissions in tonnes CO2e, at least one intensity ratio (emissions or energy per unit of revenue, floor area, or full-time equivalent), and a description of energy efficiency actions taken in the financial year. Miss any of these and your report is technically non-compliant, which delays filing and invites questions from auditors.

The UK Government SECR guidance specifies that you report Scope 1 and Scope 2 emissions as a minimum. Scope 1 covers direct emissions from sources you own or control—company vehicles, on-site gas boilers, refrigerant leaks. Scope 2 covers purchased electricity, heat, and steam. You can include Scope 3 if you want (business travel in employee-owned cars, for example), but it’s not mandatory for medium companies.

Intensity ratios trip people up. Revenue-based metrics (tCO2e per £m turnover) are common, but if your revenue has jumped due to price inflation rather than volume growth, your intensity ratio can look artificially good even if absolute emissions haven’t budged. Floor area or headcount ratios often give a clearer operational picture. Choose one that reflects how your business actually works, and understand how Scope 1, 2, and 3 emissions differ before you calculate it.

Data Collection and Calculation Methodology

You need twelve months of energy invoices: electricity, natural gas, transport fuel purchased for company-owned vehicles, and any other fuels like heating oil. If you lease buildings and the landlord pays the utilities, you’ll need to request data or estimate based on floor area and typical usage—this is a common headache for medium companies in shared office parks.

Convert energy in kilowatt-hours to emissions using the UK Government’s annual conversion factors, published every June. These factors change slightly year-on-year as the grid decarbonises, so use the set that matches your reporting period. Electricity emission factors in particular have dropped fast: the 2024 factor is roughly half what it was in 2015, which means your Scope 2 emissions fall even if your energy use stays flat.

Most medium companies use a spreadsheet and manual calculation for their first SECR cycle. That’s fine, but version control becomes a problem if multiple people touch the data. By year two or three, a lightweight carbon accounting platform or an environmental module in your existing ERP saves time and reduces error risk. The marginal cost is low once you’ve mapped your data sources. If you’re already building a net zero roadmap, the same baseline data feeds both SECR compliance and your reduction targets.

Energy Efficiency Measures and Narrative Disclosure

The qualitative section asks what you’ve done to improve energy efficiency. This doesn’t mean listing aspirations or policies—it means actual interventions with measurable impact. LED lighting retrofits, building management system upgrades, fleet electrification, staff travel policies that cut unnecessary trips. If you haven’t done anything material, you’re required to say so, which looks poor in a directors’ report.

Smart companies use this section to signal operational competence. A short paragraph explaining that you consolidated two warehouses, saving 18 percent on heating and logistics emissions, tells investors and lenders that you’re managing cost and risk. A vague statement about “encouraging staff awareness” does not. Finance directors should treat this narrative the same way they’d treat a comment on working capital management: specific, outcome-focused, and backed by numbers.

If your SECR disclosures feel like box-ticking rather than insight, we can run a baseline audit and build a reporting process that satisfies compliance and supports better capital allocation decisions.

Common Pitfalls and How to Avoid Them

Three mistakes recur. First, companies report only electricity and forget gas, vehicle fuel, or refrigerant top-ups. Scope 1 and Scope 2 both matter, and completeness is a regulatory expectation. Second, companies copy the prior year’s intensity metric without recalculating, which breaks if your denominators (revenue, headcount, floor area) have shifted. Third, the energy efficiency narrative gets written by someone in marketing who doesn’t know what the operations team actually did, resulting in generic waffle.

Another frequent error: reporting energy consumed outside the UK. SECR requires UK energy only, but if your finance system doesn’t split invoices by jurisdiction, you’ll need a manual adjustment. Overseas emissions come back into play if you’re a large company or if you voluntarily adopt wider GHG Protocol Corporate Standard reporting, but for medium SECR compliance, keep it domestic.

One contrarian point: some medium companies over-report, including Scope 3 categories they don’t need to, because a consultant told them it looked better. It doesn’t. It adds audit risk, data gaps, and comparison problems year-on-year. Comply with what SECR asks for, then build out Scope 3 supply chain emissions in a structured way if and when your stakeholders demand it or you’re preparing for larger disclosure regimes like CSRD.

How SECR Compares to Other UK Reporting Frameworks

SECR sits below large company mandatory reporting and above voluntary schemes. It’s less onerous than full GHG Protocol reporting but more specific than generic ESG statements. The table below shows where medium companies fit in the UK emissions reporting landscape.

If you’re a medium company eyeing growth, consider that crossing into the large category (more than 250 employees and turnover above £36 million) brings Scope 3 into play. That means business travel, employee commuting, upstream and downstream logistics, and waste. The data burden multiplies. Some companies deliberately manage headcount or structure subsidiaries to stay below the large threshold, though that’s a tail-wagging-the-dog decision unless the compliance cost genuinely outweighs the operational benefit of scaling.

Looking ahead, EU CSRD requirements will catch large UK companies with significant EU turnover, even post-Brexit, through subsidiary reporting. Medium UK companies exporting into the EU may find themselves in scope indirectly if a parent or major customer demands CSRD-aligned data. SECR is the floor, not the ceiling, for ambitious medium-sized businesses.

Integrating SECR Into Broader Carbon Management

SECR data should be the same baseline data you use for carbon reduction planning, capital investment appraisals, and stakeholder reporting. If your SECR figures live in one spreadsheet and your sustainability manager is building a separate carbon footprint from scratch, you’re wasting time and creating reconciliation risk. Align them from day one.

Many medium companies use SECR as the trigger to establish a proper carbon footprint assessment process. Once you’ve gathered twelve months of energy invoices, you’ve done the hardest part. Extending that into a quarterly or monthly tracking cycle, segmenting by site or business unit, and linking emissions to cost centres makes the data actionable rather than just compliant.

If your company is considering Science Based Targets or a net zero commitment, your SECR baseline becomes year zero for target-setting. SBTi requires Scope 1 and 2 reductions of at least 4.2 percent per year (in line with a 1.5°C pathway), and your intensity metric under SECR gives you a ready-made way to track progress against revenue or headcount growth. The reporting burden doesn’t double—you’re using the same data, just with more ambition attached.

Compliance is the baseline. If you want to turn SECR data into reduction roadmaps, capital expenditure cases, or supplier engagement strategies, talk to us about a full carbon audit and planning engagement.

Frequently Asked Questions

SECR reporting requirements for medium companies are clear, specific, and enforceable. The threshold tests are objective, the data requirements are bounded, and the disclosure format is prescribed. Most of the confusion comes from companies waiting until the filing deadline to start rather than embedding carbon data collection into their regular financial close process. Treat SECR like any other statutory reporting obligation: document your methodology, keep an audit trail, and review the disclosure before it goes into the directors’ report. You’ll file on time, satisfy your auditors, and build a dataset that’s useful for far more than compliance.

Frequently asked questions

Do I need to report SECR if I only just crossed the threshold this year?

No, not yet. You must meet at least two of the three size criteria (250 employees, £36 million turnover, £18 million balance sheet) in both the current financial year and the preceding one. If you crossed the threshold for the first time this year, you have one more year before your first SECR disclosure is due. Use that time to build your data collection and calculation process so you’re not scrambling at year-end.

Can I use estimated energy data if I don’t have all the invoices?

Estimation is allowed where data is not available, but you must state the methodology and proportion of data that’s estimated. If you lease space and the landlord won’t provide utility bills, pro-rata estimation based on floor area is acceptable. However, auditors and regulators expect you to improve data quality over time. Persistent large estimation gaps suggest weak controls, which can flag broader governance issues, especially if you’re audited or seeking external finance.

Do I report emissions from my overseas operations under SECR?

No, unless you’re a large company. Medium companies under SECR report UK energy consumption and associated emissions only. If you have overseas subsidiaries or operations, their energy use doesn’t count towards your SECR disclosure. That said, if you’re building a voluntary carbon footprint or preparing for investor ESG due diligence, including global operations makes sense. Just keep the SECR-compliant UK-only figure clearly separated in your directors’ report.

What happens if I file a directors’ report without SECR disclosures?

Companies House will flag the accounts as incomplete, and your auditor should qualify the report if the omission is material. You may face reputational damage, delayed filings, and enforcement action from the Financial Reporting Council. In practice, most regulators have focused on education rather than fines for first-time breaches, but that’s changing. Repeat non-compliance or deliberate omission now attracts scrutiny, especially if you’re in a regulated sector or receiving government contracts. It’s not worth the risk when compliance is straightforward.