ESOS compliance, done properly and priced fairly.
If your business is large enough to fall under the Energy Savings Opportunity Scheme, we run the whole assessment 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.
- Energy Institute
- CIBSE
- Energy Managers Association
- ISO 50001 aligned
Two questions tell you whether ESOS applies.
ESOS applies to large UK undertakings. You qualify if, on the qualification date, you meet either of the two thresholds.
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.
Four steps. We 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.
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 SECR, ISO 50001 and your 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 people who will run your assessment.
J. Marshall
Registered with the Energy Institute. Leads multi-site industrial assessments.
S. Patel
CIBSE-accredited. Specialises in HVAC, lighting and building fabric audits.
R. Chen
Handles fleet and transport energy, data collection and the notification submission.
Engineers who understand your energy, not just the paperwork.
ESOS.works is our dedicated ESOS service. We're an engineering and sustainability consultancy, and every assessment is led and signed off by registered Lead Assessors who treat the audit as an engineering exercise, not a form.
Registered Lead Assessors
Every assessment led and signed off by an assessor on an approved ESOS register.
Multi-site experience
From single offices to complex industrial estates and transport fleets across the UK.
Savings that pay back
Recommendations that are real and costed, not a box-ticking exercise.
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.
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.
Get your ESOS quote.
Tell us about your organisation and we'll scope it against your sites and headcount.
Request a quote