UK Onsite Energy Compliance Hub
Everything UK commercial and industrial sites need to navigate ESOS Phase 3, Building Regulations Part L, and SECR Carbon Reporting obligations — in one place.
Live Compliance Snapshot
ESOS Phase 3 · Building Regs Part L · SECR
Compliance Deadlines
The UK's energy compliance landscape has three overlapping regulatory obligations — each with its own deadline and qualifying criteria. Know which apply to your site.
ESOS Phase 3 Deadline
All qualifying organisations (250+ employees or £44m+ turnover) must submit their ESOS Phase 3 audit, including onsite generation feasibility assessment.
SECR Annual Reporting Cycle
Streamlined Energy and Carbon Reporting (SECR) data must be included in your Directors' Report filed with Companies House for financial years ending in 2026.
Building Regs Part L — New Commercial Developments
Developments over 1,000m² must meet 20% onsite generation and 30% battery storage requirements. Local authorities are withholding completion certificates for non-compliant sites.
UK Interim Net Zero Target
Mandatory 68% reduction in carbon emissions against 1990 baseline. Energy transition planning must begin now to meet 2030 milestones without prohibitive retrofit costs.
Check Your Compliance Status
Answer 6 quick questions and get a personalised summary of your obligations — with clear next steps before the December 2026 deadline.
This quiz covers
- ESOS Phase 3 — Do you qualify and are you on track for Dec 2026?
- Building Regs Part L — Does your development meet onsite generation requirements?
- SECR Carbon Reporting — Are you capturing and reporting the right energy data?
Free Tool
ESOS Compliance Status Quiz
Answer 6 short questions about your organisation and we'll produce a personalised compliance gap summary covering ESOS Phase 3, Building Regulations Part L, and SECR carbon reporting — and flag exactly what you need to do before December 2026.
- Takes under 2 minutes
- Covers ESOS, Part L & SECR in one assessment
- Instant personalised action plan
- No email required
The Three Pillars of UK Energy Compliance
ESOS — Energy Savings Opportunity Scheme
Phase 3: Dec 2026ESOS Phase 3 applies to all UK organisations with 250+ employees or a turnover exceeding £44 million. Unlike previous phases, audits must now include a specific onsite generation feasibility assessment — covering solar PV, battery storage, CCHP, and heat pumps. Sites that fail to include this assessment face penalties of up to £50,000. The deadline of 5 December 2026 is firm, and lead times for compliant audits are already stretching beyond three months.
UK Government Updates Onsite Energy Regulations for 2026Building Regulations Part L — Conservation of Fuel and Power
In Force NowThe 2026 amendments to Part L raise minimum onsite generation requirements from 10% to 20% of predicted annual energy demand for new commercial and industrial developments over 1,000m². Developers must also include battery storage equal to at least 30% of installed generation capacity. These are building control conditions — local authorities are actively withholding completion certificates for non-compliant sites. Zero-CAPEX finance models such as PPAs can satisfy the requirements without upfront capital expenditure.
Zero-CAPEX Finance Models for Onsite EnergyCarbon Reporting — SECR Obligations
Annual CycleThe Streamlined Energy and Carbon Reporting (SECR) framework affects over 12,000 UK companies — any large unquoted company or LLP meeting two of: 250+ employees, £36m+ turnover, or £18m+ balance sheet. You must report annual energy use, Scope 1 & 2 carbon emissions, and an intensity ratio in your Directors' Report. Onsite generation is a powerful lever: every kWh generated from solar carries zero Scope 2 emissions against a grid intensity of approximately 180g CO2/kWh, turning compliance into a competitive advantage.
Carbon Reporting 2026: What SECR Means for Your Energy DataDownload the 2026 Compliance Checklist
A printable, 12-step compliance roadmap covering ESOS Phase 3, Building Regulations Part L, and SECR Carbon Reporting — everything a UK commercial site needs to verify before December 2026.
- 12 actionable compliance steps
- Covers ESOS, Part L & SECR
- Printable PDF-quality layout
- Plain English — no legal jargon
2026 Compliance Checklist
Skyline DC Energy
Confirm ESOS Phase 3 qualification status
Appoint a qualified Lead Energy Assessor
Gather 12 months of half-hourly interval data
Complete onsite generation feasibility assessment
Assess 20% onsite generation requirement for new developments
+ 7 more steps…
This page provides general guidance only and does not constitute legal or professional advice. Consult a qualified energy assessor for your specific compliance obligations.