If you let out offices, shops, warehouses or mixed‑use premises in the UK, staying ahead of Energy Performance Certificate (EPC) legislation matters. The rules are tightening quickly. The 2025 EPC regulation means that let commercial properties must have a valid EPC – rated at least E – or face serious consequences. Understanding these changes now equips you to protect your portfolio’s legal compliance, value and appeal.
What Is an EPC and Why It Matters
An EPC assesses a building’s energy efficiency on a scale from A (most efficient) to G (least). It’s required when a property is built, sold or leased. For landlords, an EPC influences tenant interest, property valuation and access to funding. Having a valid, current rating ensures you remain compliant and attractive in a competitive market.
EPC Requirements: 2023 Through the 2030s
- Since April 2023: All commercial properties – under both new and existing leases – must hold at least an E rating to be lawfully let.
- From April 2025: A valid EPC is mandatory for all let commercial properties – even if the lease hasn’t changed. Letting a property with a rating below E or no certificate is unlawful.
- Proposed deadlines: By 2027 or 2028, the minimum rating may rise to C; by 2030, to B.
Planning now avoids costly upgrades, asset devaluation or void periods later on.
Enforcement Consequences You Should Know
Failure to comply can lead to enforcement by local authorities, including:
- Fines ranging from £5,000 to £150,000
- Public enforcement notices
- Lease terms potentially being deemed unenforceable
EPC Myths Versus Facts
Myth: You only need an EPC when a lease changes.
Reality: EPCs are required for all let premises, regardless of lease movement.
Myth: Costly upgrades mean automatic exemption.
Reality: Exemptions must be formally registered and justified – they’re not automatic.
Myth: Old EPCs still count.
Reality: EPCs expire after 10 years. If yours expires in 2025, you need a fresh certificate.
Myth: Listed buildings always qualify for exemptions.
Reality: Only exempt if energy improvements would harm historical character – and evidence is required.
How to Improve Your EPC Rating
Upgrading now not only ensures compliance but also positions your properties to meet future standards – and even raise asset value.
1. Upgrade Lighting
Switch to LED systems and install motion detectors or daylight sensors.
2. Improve Heating and Cooling
Fit modern HVAC systems, smart thermostats and zoning controls.
3. Enhance Insulation
Add insulation to walls, roofs and suspended floors. Draught‑proof windows and doors.
4. Install Efficient Glazing
Replace single glazing with double or triple glazing and consider solar‑reflective coatings.
5. Generate Renewable Energy
Install rooftop solar PV and battery storage – Prostar’s zero‑capital GreenBattery solution is particularly effective.
6. Monitor Energy Use
Use a Building Energy Management System (BEMS) and smart meters to identify usage trends.
Why Prostar Energy Is the Partner to Choose
At Prostar Energy, we combine bespoke solar solutions with energy storage to lower bills, enhance ratings and shield your buildings from price volatility. Our Power Purchase Agreements (PPAs) allow you to benefit from solar power without upfront costs. Prostar retains ownership and maintenance. You simply buy the clean energy generated – at a fixed, competitive rate – which helps improve your EPC and building credentials.
Landlords who act now gain multiple advantages:
- Spread costs across staged upgrades
- Utilise solar PPAs to upgrade sustainably and cost-effectively
- Future-proof buildings ahead of expected EPC C/B mandates
Quick EPC Compliance Checklist
- Check if your property has a valid EPC
- Note the current rating and target improvements
- Book a commercial energy assessment
- Prioritise “quick wins” (LEDs, insulation, HVAC)
- Explore solar PV and battery options via Prostar
- Obtain quotes and plan staged works
- Commission a post-upgrade EPC
- Register exemptions only if necessary and appropriately justified
- Maintain records for compliance
- Monitor upcoming standards for 2027/2028 (C) and 2030 (B)
Final Word
The 2025 EPC regulations mark the start of a transformation in UK commercial property. Waiting too long risks high costs, logistical challenges and non-compliance. Treat EPC E as a temporary threshold and aim for at least C now – ideally B long term. That’s how you safeguard your portfolio, retain tenant interest, comply with legislation and reduce operating costs.
Prostar Energy stands ready to help. From EPC improvement strategies to solar PV and energy storage with zero-capex investment, we deliver practical, future-proof solutions. Get in touch to begin your tailored upgrade journey.
