The compliance deadline for ESOS Phase 4 is 5 December 2027. Missing it triggers enforcement by the Environment Agency (and equivalent regulators in Scotland, Wales, and Northern Ireland).

Penalties for non-compliance are set out in the Energy Savings Opportunity Scheme Regulations 2014:

Failure to notify by the deadline — fixed penalty up to £5,000, plus £500 per day continuing penalty (capped at £40,000 in total).
Failure to maintain adequate records — fixed penalty up to £5,000.
Failure to undertake an energy audit — fixed penalty up to £50,000, plus £500 per day continuing penalty (capped at £40,000).
False or misleading statement — up to £50,000 per breach.
Publication of non-compliance — the Environment Agency publishes a list of non-compliant organisations. The reputational impact often exceeds the financial penalty.

The Environment Agency typically allows a remedial period and accepts late notifications with mitigation. In practice the worst outcomes come from sustained non-engagement, not from being a few weeks late.

If you have missed the deadline or are at risk of missing it, the most important step is to engage with the Environment Agency early and start the audit work. Vital Direct can scope and deliver ESOS Phase 4 assessments at short notice — contact us to discuss.