ESOS consultants who run the whole scheme for you.
If your business is large enough to fall under the Energy Savings Opportunity Scheme, we run the whole thing for you, audit, report and lead-assessor sign-off, and hand you a clear list of savings worth acting on. No jargon, no scramble before the deadline.
A few questions tell you whether ESOS applies.
ESOS applies to large UK undertakings, and to corporate groups as a whole. If any UK company in a group meets the size thresholds on the qualification date, the entire group must comply together, by default.
Not sure how employees or turnover are counted across your group? That's exactly what our free scoping call is for. Ask us.
A mandatory energy audit, once every four years.
The Energy Savings Opportunity Scheme is a UK-wide programme run by the Environment Agency. Qualifying organisations must audit their energy use and notify compliance each phase.
Measure total energy
Twelve months of energy across buildings, industrial processes and transport, the full organisational picture.
Audit 95% of it
Energy audits covering at least 95% of total consumption, identifying practical, costed savings opportunities.
Report & notify
A Lead Assessor signs off, a board director approves, and you notify the Environment Agency before the deadline.
The compliance phases
Each phase runs on a four-year cycle. Phase 4 is the one to plan for now.
Deadline 5 Dec 2027
Missing the deadline is expensive, and public.
The Environment Agency enforces ESOS with civil penalties, and non-compliant organisations can be named publicly.
Already behind, or has the Environment Agency been in touch? See how we resolve enforcement and missed deadlines →
ESOS consultants who do the heavy lifting.
From the first scoping call to the notification receipt, you have one point of contact and a price agreed up front against a scope we map with you.
Scope & quote
A short call and a desktop review to confirm you qualify and map every site, so we scope the work properly and agree a clear price against it.
Data & audit
We gather energy data and carry out the site audits, buildings, processes and transport, with minimal disruption.
Report & sign-off
Your Lead Assessor compiles the report, ranks the savings, and provides the compliant sign-off for your director.
Notify & save
We submit your notification to the Environment Agency and leave you with a clear plan to act on the savings.
Not all Energy Audits are the same!
An ESOS audit has to be carried out and signed off by people competent to do it, and that is a legal requirement, not a nicety: a registered Lead Assessor, and auditors who genuinely understand the energy in your industry, rather than a generalist ticking boxes. Get the wrong team and the audit is neither compliant nor useful. We match the audit to your sector, so it is defensible and finds the savings that actually exist in your operation.
Who regulates ESOS?
Your ESOS is the same across the UK; the difference is which regulator you answer to. Find yours below, or see how the offshore sector is handled.
Compliance closed, and a return on the work.
ESOS isn't just a box to tick. Done properly, the audit pays for itself in the savings it uncovers.
Full ESOS audit report
A complete, compliant report covering 95%+ of your energy use, ready for the Environment Agency.
Ranked savings register
Every opportunity costed and ranked by payback, so you can act on the ones that matter first.
Lead Assessor sign-off
Formal sign-off from a registered Lead Assessor and a director-ready compliance pack.
Environment Agency notification
We handle the notification submission end to end, and confirm your compliance is on record.
Net-zero head start
A baseline and data set that feed straight into your SECR and net-zero reporting.
A price agreed up front
Once your organisation is scoped, you get a clear price for the defined work. No open-ended day rates, no surprises at the end.
The questions we get asked most.
Does ESOS actually apply to my organisation?
ESOS applies to large UK undertakings and their corporate groups. If you employ 250 or more people, or have turnover over £44m and a balance sheet over £38m, you almost certainly qualify. Group structures can be complex, which is what our free scoping call is for.
What's the deadline I need to hit?
Phase 4 has a qualification date of 31 December 2026 and a compliance deadline of 5 December 2027. Leaving data collection and audits late is the main cause of missed deadlines, so earlier is safer.
Is there anything to do after we notify?
Yes. Phase 4 adds a follow-up action plan, due by 5 December 2028, setting out the measures you intend to take, then annual progress updates in 2029 and 2030. We build the action plan straight from your audit findings and can keep the progress updates on track, so the savings actually get delivered.
How much of our time will this take?
We do the heavy lifting. You provide access to energy data and sites; we handle the audits, the report, the sign-off and the notification. Most of your effort is a short scoping call and gathering bills.
What does it cost?
It depends on your scope: the number of sites, and how your energy splits across buildings, processes and transport. That is exactly what the scoping step establishes, because most organisations do not have that picture to hand. We map it with you first, then agree a clear price for the defined work up front, with no open-ended day rates. Request a quote to start the scoping conversation.
We already have ISO 50001 / SECR, do we still need ESOS?
Often yes. Full ISO 50001 coverage can satisfy ESOS, but only if it covers your total energy use. SECR is a separate reporting obligation. We check your existing coverage as part of scoping.
Engineers who understand your energy, not just the paperwork.
ESOS.works is our dedicated ESOS consultancy. We are all professionally registered engineers, specialists in buildings, transport and industrial process, so every audit is treated as an engineering exercise, not a form to fill in. Between us we have carried out thousands of energy audits and signed off hundreds of ESOS participants.
Registered engineers, not just assessors
Led and signed off by a professionally registered engineer who is also a registered ESOS Lead Assessor.
Buildings, transport and process
Specialists across all three areas ESOS has to cover, so nothing in your energy use is missed.
Proven at scale
Thousands of energy audits carried out, and hundreds of ESOS participants signed off in earlier phases.
Get your ESOS quote.
Tell us about your organisation and we'll scope it against your sites and headcount.
Request a quotePrefer a call? Request a quote and choose "call back", or email info@esos.works with a question.