Properties with multiple extensions or additions are popular for their increased space and flexibility. However, when it comes to Energy Performance Certificates (EPCs), mixed-age homes often present unique challenges. Even after renovations, EPC ratings can be lower than expected, leaving homeowners and landlords searching for answers.
At Urgent EPC, we regularly assess such properties and help clients understand why EPCs may not reflect recent improvements.
Why Mixed-Age Properties Struggle with EPC Ratings
Mixed-age properties combine elements built in different periods, often using varying construction methods and materials. These variations can create inconsistencies in energy efficiency, affecting EPC assessments. Common issues include:
1. Inconsistent Wall Construction
Older sections may have solid walls, while newer extensions use cavity walls. Insulation levels and thermal performance vary between sections, creating “weak spots” that reduce the overall rating.
2. Varying Roof and Loft Standards
Older roofs may lack insulation or have deteriorated materials, whereas newer extensions meet modern standards. EPC assessors account for the lowest-performing areas, which can drag down scores.
3. Multiple Heating Systems
Properties with extensions may have multiple or mismatched heating systems, including older boilers or radiators. Integrating new systems efficiently is critical; otherwise, EPC software may assume higher energy consumption.
4. Thermal Bridging at Junctions
Where new and old structures meet, thermal bridging can occur, allowing heat to escape through walls, floors, or roof connections. Even minor gaps can significantly impact EPC performance.
5. Documentation Challenges
Accurate EPC assessments require evidence of construction and renovation. Mixed-age properties often lack consistent records, forcing assessors to make conservative assumptions that lower ratings.
How to Improve EPC Ratings in Mixed-Age Homes
While some factors are inherent to the property, there are steps homeowners can take:
Upgrade Insulation: Focus on weak areas like older walls, lofts, and floors.
Integrate Heating Systems: Ensure new and existing systems work together efficiently.
Seal Gaps and Thermal Bridges: Pay attention to junctions between old and new sections.
Document All Improvements: Keep receipts, certificates, and installation evidence to support your EPC assessment.
Consider Renewable Energy: Solar panels or heat pumps can boost energy efficiency ratings.
How Urgent EPC Can Help
At Urgent EPC, we:
Conduct detailed Residential EPC assessments that account for mixed-age construction.
Offer Same-Day EPC services for urgent sales or lettings.
Provide expert advice on energy improvements tailored to complex properties.
Deliver transparent pricing plans and practical guidance for homeowners and landlords.
Conclusion
Mixed-age properties with multiple extensions pose challenges for EPC ratings due to variations in construction, insulation, heating systems, and thermal bridging. With careful assessment, targeted improvements, and professional guidance, homeowners can optimise energy efficiency and improve their EPC scores.
For accurate EPC assessments and advice on maximising your rating in a mixed-age property, contact Urgent EPC today.
