Homeowners often assume that once a property is renovated, it will automatically achieve a higher EPC rating. Unfortunately, that isn’t always the case. Even modernised homes can score poorly on an Energy Performance Certificate (EPC), leaving sellers, landlords, and buyers frustrated.
At Urgent EPC, we regularly see properties that have been upgraded but still fail to perform as expected during assessment. Let’s explore the reasons why — and what you can do about it.
Why Renovated Homes Still Fail EPCs
1. Poorly Installed or Incomplete Insulation
Lofts, walls, and floors may look “renovated,” but gaps, compression, or skipped areas in insulation reduce energy efficiency. Even small defects can have a big impact on the EPC score.
2. Default Assumptions in EPC Software
If the assessor cannot access or verify certain features, EPC software defaults to conservative (often inefficient) values. Without proof of upgraded materials, the system assumes the worst.
3. Heating and Hot Water Systems Left Behind
Upgrading the kitchen and windows won’t help if the property still runs on an outdated boiler, poor radiators, or lacks modern heating controls. Heating and hot water remain key drivers of EPC ratings.
4. Extensions and Loft Conversions
Additions to the property may not match the insulation levels of the main building. Conservatories, poorly insulated loft conversions, or mixed construction methods often drag the overall rating down.
5. Lack of Evidence or Documentation
Assessors need proof — certificates, receipts, or building control approvals — to confirm upgrades. Without this, the system assumes the property is less efficient than it really is.
How to Prevent EPC Failures After Renovation
Keep records: save receipts, technical datasheets, and installation certificates.
Prioritise energy improvements: focus on insulation, efficient heating systems, and airtight windows.
Plan upgrades strategically: ensure all elements of the building fabric and systems work together.
Book a professional assessment: our team at Urgent EPC provides Residential EPCs and Same-Day EPCs with guidance on improving ratings.
Why Work with Urgent EPC?
Same-day appointments available for urgent sales or lettings.
Transparent pricing plans with no hidden fees.
Experienced assessors who understand the common pitfalls in renovated homes.
Practical advice on boosting your property’s energy efficiency before listing it.
Final Thoughts
Renovations improve comfort and aesthetics, but without the right focus, they won’t guarantee a strong EPC rating. From insulation quality to heating efficiency and proper documentation, small details matter.
If your renovated home has scored poorly — or you want to avoid that outcome — book an expert EPC assessment today with Urgent EPC.
