Energy Performance Certificates (EPCs) play a crucial role in property sales and rentals across the UK. A high rating not only makes your property more attractive but can also improve energy efficiency and reduce bills. However, many property owners are surprised when their EPC rating is lower than expected.

Some of the hidden factors that can drag down your EPC are easy to overlook — but knowing them can help you improve your rating and property value.

1. Incorrect or Missing Insulation Data

EPC assessments rely heavily on accurate information about insulation. If loft, wall, or floor insulation is missing, outdated, or not recorded properly, your rating may drop.

Tip: Always provide your assessor with installation certificates or building plans to ensure all insulation is accounted for. For professional help, check our EPC Assessors London page.

2. Outdated Heating Systems

A property with an old boiler or inefficient heating system may receive a lower EPC rating, even if minor upgrades have been installed.

Tip: Upgrading to a modern, energy-efficient boiler or using smart thermostats can boost your SAP score. Learn about our expert services on the About Us – EPC Company London page.

3. Poor Window or Glazing Information

Double or triple glazing significantly affects energy efficiency. EPCs can underestimate your property’s rating if glazing information is incorrect or missing.

Tip: Confirm glazing details with your assessor and provide supporting documents if necessary. You can book an assessment to ensure your property is recorded correctly.

4. Overlooked Renewable Energy Sources

Solar panels, heat pumps, and other renewable installations may not always be included in EPC calculations if the assessor is unaware. Missing these can reduce your rating unnecessarily.

Tip: Always inform the assessor of any renewable systems and provide installation certificates to ensure they are counted.

5. Misreported Property Size or Layout

Errors in floor area, number of rooms, or construction type can significantly affect your rating. Even small discrepancies can lower your EPC band.

Tip: Provide accurate floor plans, building control documents, or recent surveys. For guidance, visit our Pricing page for transparent EPC assessment costs.

Bonus Tip: Check for Clerical Errors

Sometimes, an EPC rating is lowered due to simple clerical errors, such as a missing number or wrong input. If you suspect a mistake, you can challenge your EPC — read more about this on our Contact Us – EPC Services London page.

📍 Address: 150–160 City Road, London, EC1V 2NX
📞 Phone: 020 3488 4142
📧 Email: info@epcrate.co.uk

Final Thoughts

A lower-than-expected EPC rating can often be traced to hidden factors like insulation errors, outdated heating, or missing renewable energy information. By ensuring accurate data and proper documentation, you can improve your EPC, increase property value, and comply with UK regulations.

For professional assessments and expert advice, contact EPCrate today and make sure your property is represented correctly.

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