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Compliance·10 min read·Updated 17 May 2026
ESOS Phase 4 compliance: complete guide for UK businesses
Short answer
ESOS Phase 4 is the fourth four-year cycle of the UK Energy Savings Opportunity Scheme. Large undertakings (250+ employees or £44m+ turnover and £38m+ balance sheet) must complete an ESOS audit and submit compliance notification by 5 December 2027, covering the qualifying period ending 31 December 2026.
This guide is being written. The short answer above covers the essentials. Email us at enquiries@energyplanner.co.uk if you want the full briefing now.
What this guide will cover
- Detailed walkthrough of esos phase 4 compliance: complete guide for uk businesses
- Real-world examples from UK businesses we work with
- Common mistakes to avoid
- How to apply the principles to your own contracts
