Many homeowners and landlords are surprised when their property only just passes an EPC assessment. Properties in the “grey zone” often meet the minimum legal standards but remain energy inefficient, leading to higher bills and potential compliance issues. Understanding what keeps a property in this zone—and how to improve it—can save money and improve comfort.

Learn more about our professional EPC services on our About Us page.

What is the EPC Grey Zone?

The “grey zone” refers to properties with EPC ratings just above the legal minimum (usually E or D). While these properties technically comply, they:

  • Lose heat faster than more efficient homes

  • Consume more energy for heating and cooling

  • Have higher carbon footprints

  • May struggle to attract tenants or buyers

A property in this zone may seem fine at first glance but can be costly over time.

Common Causes of Grey Zone Ratings

1. Incomplete Insulation

  • Loft, wall, and floor insulation may be missing or improperly installed.

  • Small gaps or uninsulated areas allow heat to escape.

2. Inefficient Heating Systems

  • Older boilers or heating controls reduce energy efficiency.

  • Radiators without thermostatic valves may overheat rooms unnecessarily.

3. Minor Draughts

  • Gaps around windows, doors, or loft hatches often go unnoticed.

  • Even small draughts can reduce EPC scores.

4. Hidden Thermal Bridges

  • Heat can escape through structural elements like steel beams or balcony junctions.

  • Modern homes can still have these if construction details were overlooked.

Fast Ways to Improve a Grey Zone EPC

a) Upgrade Insulation

  • Add loft boards, cavity wall insulation, or insulated floorboards.

  • Professional assessors can highlight priority areas.

b) Seal Draughts

  • Fit draught-proof strips to doors and windows.

  • Check loft hatch and skirting gaps.

c) Improve Heating Efficiency

  • Upgrade boilers or controls.

  • Install thermostatic radiator valves (TRVs).

  • Consider smart heating systems.

d) Consider Renewable Solutions

  • Solar panels, heat pumps, or solar water heating can complement efficiency improvements.

For guidance and assessment, see our EPC Services – Assessors London.

Why Professional EPC Assessment is Key

A certified Domestic Energy Assessor (DEA) can:

  • Identify hidden inefficiencies keeping your property in the grey zone

  • Recommend cost-effective improvements

  • Provide an accurate EPC rating for compliance or resale

Book a certified assessment via our Booking Page.

Contact Us for EPC Help

Have questions about improving your EPC?
Reach out through our Contact Page for expert advice and fast support.

Email:info@epcrate.co.uk

Phone:020 34884142