Clarity. Confidence. Control.

ESOS Compliance Checklist

Phase 4 | Qualification Date: 31 December 2026 | Deadline: 5 December 2027

1Check Your Qualification

Do you meet ANY of these criteria?

250+ employees

Turnover of £44 million or more

Balance sheet total of £38 million or more

You're a large undertaking in the UK

If YES to any of the above, you likely qualify for ESOS Phase 4.

2Gather Your Data

Last 3 years of utility bills (electricity, gas, oil, water)

Building floor plans and square footage

Details of all buildings in your portfolio

Employee headcount (as of 31 Dec 2026)

Company turnover and balance sheet figures

Details of any energy management systems in place

Previous energy audits or assessments (if any)

Details of any energy efficiency improvements made in the last 3 years

3Building & Transport Information

Document the following for each building:

Address and postcode

Building type (office, warehouse, retail, manufacturing, etc.)

Year built

Total useful floor area (m²)

Primary use

Heating system type

Cooling system type

Lighting type

Any renewable energy systems

Transport (if applicable):

Company vehicle fleet details

Annual mileage

Fuel type and consumption

4Understand Your Compliance Route

Choose one of three routes:

Energy Audit Route - Comprehensive audit of all buildings and transport

ISO 50001 Route - If you hold ISO 50001 certification

Energy Management System Route - If you have an accredited EMS in place

Confirm which route applies to your organisation

5Appoint Your Lead Assessor

Confirm you'll use a directly employed, CIBSE-accredited lead assessor

Ensure they hold current CIBSE membership (MICBSE or TIET)

Verify they have HND in electrical/mechanical building services engineering

Check their continuous professional development (CPD) is current

6Audit Requirements

Your lead assessor will:

Conduct on-site visits to all buildings

Review utility data and consumption patterns

Identify energy-saving opportunities

Calculate potential savings (kWh and cost)

Assess payback periods

Document all findings in a detailed report

7Build Your Evidence Pack

Qualification evidence (employee count, turnover, balance sheet)

Utility bills and consumption data (3 years)

Building information and floor plans

Transport data (if applicable)

Energy audit report

Details of energy-saving recommendations

Payback period calculations

Lead assessor's credentials and declaration

8Director Sign-Off

Review the audit report with your leadership team

Confirm accuracy of all data and findings

Obtain formal sign-off from a director or company officer

Document the sign-off in writing

9Notify the Environment Agency

Submit your ESOS notification to the Environment Agency by 5 December 2027

Include your audit report and evidence pack

Keep copies of all submissions for your records

10Post-Compliance Obligations

Develop an action plan for implementing energy-saving recommendations

Review and update your action plan annually

Monitor progress on implemented measures

Keep records of all energy-saving actions taken

Be prepared for Environment Agency compliance checks

Key Deadlines

Phase 4 Qualification Date	31 December 2026
ESOS Compliance Deadline	5 December 2027
Annual Action Plan Review	Annually from notification

Questions? We're here to help.

[email protected] | 01484 929545 | hawleyenergy.co.uk

TTL Consultants Ltd
Clifton House, Brighouse, HD6 1SL

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