Yes, a property’s EPC (Energy Performance Certificate) rating can go down over time, even if no major structural changes are made. Here’s why:

🔍 Reasons an EPC Rating May Decline Over Time:

  1. Changes in EPC Assessment Criteria
    Government regulations and assessment standards can be updated. A home rated “C” a few years ago might now score lower under revised metrics.

  2. Aging of Heating Systems & Insulation
    Over time, boilers, insulation, windows, and other components can lose efficiency due to wear and tear, reducing your property’s energy performance.

  3. Technological Benchmarks Shift
    As newer buildings adopt more efficient technologies (like solar panels or air-source heat pumps), older homes may be rated less favourably in comparison.

  4. Lack of Maintenance
    Poor upkeep of systems like heating, ventilation, or even simple draught-proofing can impact overall efficiency and lower your EPC score.

✅ Tip: How to Maintain or Improve Your EPC Rating

  • Regularly service boilers and heating systems

  • Upgrade to LED lighting

  • Top up or replace loft and cavity wall insulation

  • Consider renewable energy installations (e.g., solar PV)

  • Keep documentation of all energy-related upgrades for future assessments

    At EPCrate.co.uk, we are experienced EPC assessors providing fast, affordable, and compliant certificates across London.