Compliance · ESOS Phase 4

ESOS Phase 4 Support

If you're a large UK business, ESOS (the Energy Savings Opportunity Scheme) isn't optional. It's a mandatory energy assessment scheme, overseen by the Environment Agency, that requires qualifying companies and corporate groups to audit their energy use across buildings, industrial processes and transport every four years to identify cost-effective ways to save energy. ESOS is not just about compliance — it is about identifying cost-effective opportunities to make real energy and carbon savings. We make it simple — Energy Reduction Auditors, ESOS Lead Assessors, and Sustrax digital carbon and energy reporting.

Book a Consultation → Check your eligibility

Lead assessor carrying out an ESOS energy audit

On-site ESOS energy audit

End-to-End Service

Complete Phase 4 support

From scoping to submission, our highly experienced ESOS team supports every stage of your compliance. Backed by over 20 years of helping companies cut energy and carbon across buildings and transport fleets including company cars, grey fleet, vans, lorries and aircraft.

STEP 01

Gap Analysis & Scoping

We determine your exact qualification status and required coverage to ensure efficient compliance.

STEP 02

Investment Grade Audits

Detailed site surveys and transport audits to identify high-ROI energy saving opportunities that actually reduce costs.

STEP 03

Lead Assessor Sign-Off

Our team, which includes Lead Assessors, reviews and approves your submission as well as carrying out all the energy audits.

STEP 04

Phase 4 Submission

Support in uploading your final ESOS Phase 4 submission ahead of the deadline of 5 December 2027.

STEP 05

Action Plan

Transform audit insights into strategy with expert support preparing and submitting your compliant ESOS Action Plan.

Do you qualify?

Check your ESOS eligibility

Your organisation must comply with ESOS if, on the qualification date, it meets either threshold below — or is part of a UK corporate group where at least one member does.

250 or more employees

You employ 250 or more people in the UK.

Turnover & balance sheet

You have an annual turnover over £44 million and a balance sheet total over £38 million.

Not sure? Check with our team →

Experts + Software

The modern way to manage compliance

Don't rely on static spreadsheets for dynamic regulation. Carbon Footprint Ltd combines ESOS Experts and Lead Assessors with Sustrax, our world-class carbon management software.

Digitised evidence pack — secure audit data.
Automated tracking — real-time Action Plan progress.
Audit-ready — simplifies reporting.

Sustrax software for ESOS evidence and tracking

Beyond Compliance

Use ESOS as a springboard for the Net Zero Standard

Leading organisations use ESOS as a springboard for credible climate action. We align findings with our Net Zero Standard.

Strategic Support — need a Lead Assessor and a comprehensive Action Plan? Get an ESOS strategy.
Software Demo — want to see how Sustrax can automate your reporting? Demo Sustrax.

View the Net Zero Standard Demo Sustrax

Trusted & Certified

Backed by proven credentials

An experienced ESOS practice supported by recognised quality and environmental certifications.

Trusted by 100 UK organisations for ESOS ISO 14001 Certified ISO 9001 Certified ISO 50001 Alternative Route