Energy Performance Certificates (EPCs) are essential for assessing a property’s energy efficiency, but many homeowners and landlords make mistakes that can lead to lower-than-expected ratings. Understanding common pitfalls helps you avoid EPC failures, improve ratings, and save on energy costs.

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1. Poor Insulation

  • Loft, wall, or floor insulation may be missing or outdated

  • Gaps or thermal bridges allow heat to escape

  • Using inconsistent insulation materials in renovations

Impact: One of the most common reasons for EPC failure, lowering the overall energy rating.

2. Inefficient Heating Systems

  • Old or poorly maintained boilers

  • Lack of thermostatic radiator valves (TRVs) or programmable controls

  • Heating systems not properly integrated into new extensions or loft conversions

Impact: Wasted energy and lower EPC scores.

3. Inadequate Windows and Doors

  • Single glazing or damaged frames

  • Gaps around doors, windows, and skirting boards

  • Skylights or dormer windows without energy-efficient glazing

Impact: Increases heat loss, reducing EPC ratings and energy efficiency.

4. Ignoring Renewable Energy Opportunities

  • Solar panels, heat pumps, or solar water heating are absent

  • No integration of energy-saving technologies in renovations

  • Failing to consider renewable solutions in older homes

Impact: Renewable energy can significantly improve EPC scores and help avoid failures.

5. Poor Air Tightness and Ventilation

  • Draughts around doors and windows

  • Unsealed loft hatches and wall junctions

  • Inadequate ventilation that causes energy loss

Impact: Even small leaks can reduce EPC efficiency, leading to lower scores.

6. Outdated or Incorrect Property Data

  • EPC assessors rely on accurate property data

  • Incorrect dimensions, heating types, or insulation details may lead to errors

  • DIY assessments or online estimates may not reflect reality

Impact: Ensuring accurate, up-to-date information prevents unnecessary EPC failures.

How to Avoid EPC Failures

  • Upgrade insulation and heating systems before assessment

  • Seal windows, doors, and loft access points

  • Consider renewable energy solutions for new and existing properties

  • Maintain accurate property documentation

  • Schedule a professional EPC assessment by a certified Domestic Energy Assessor (DEA)

Book your professional assessment via our Booking Page.

Contact Us for EPC Support

Want to ensure your property avoids EPC failures and achieves the highest possible rating?
Reach out via our Contact Page for expert guidance.

Email :info@epcrate.co.uk

Phone:020 34884142