When homeowners and landlords think about improving their EPC (Energy Performance Certificate) rating, insulation, windows, and heating systems usually come to mind. However, one often-overlooked factor can significantly impact your rating: thermal bridging.
At Urgent EPC, we frequently see properties where even minor thermal bridges cause unnecessary EPC downgrades, despite recent renovations or upgrades. Understanding what thermal bridging is and how to address it can save money, improve comfort, and prevent low EPC scores.
What Is Thermal Bridging?
A thermal bridge occurs where a building material allows heat to bypass insulation. This usually happens at junctions, corners, or structural elements such as:
Roof-to-wall connections
Floor-to-wall junctions
Window and door frames
Beams or lintels within walls
Heat escapes more easily through these points, reducing overall energy efficiency and increasing heating costs.
How Thermal Bridging Affects Your EPC
Even a well-insulated property can suffer EPC downgrades if thermal bridges are present:
Reduced Overall U-Values
Thermal bridging effectively lowers the insulation performance of walls, roofs, or floors, which EPC assessors measure through U-values.Increased Energy Loss
Warm air escapes in winter and cool air escapes in summer, forcing heating or cooling systems to work harder, which EPC software registers as poor energy efficiency.Condensation and Moisture Risks
Thermal bridges often create cold spots, leading to condensation, damp patches, and potential mould growth — all of which can influence EPC outcomes.
Common Causes of Thermal Bridging in Renovated Homes
Extensions or loft conversions that don’t fully integrate with existing insulation
Structural beams or steel supports left exposed
Window and door frame installations that bypass insulation
Poorly sealed junctions between walls, roofs, and floors
Even minor oversight in these areas can lower a property’s EPC rating, despite visible renovations.
How to Minimise Thermal Bridging
Use continuous insulation around junctions and openings.
Seal gaps at window and door frames with appropriate airtight materials.
Ensure loft and roof extensions are correctly insulated and joined to existing structures.
Consider thermal bridge-resistant construction methods during major renovations.
A professional EPC assessor can identify potential thermal bridges and provide practical advice to address them. At Urgent EPC, our team ensures accurate reporting and guidance to help you maximise your EPC rating.
Why Work with Urgent EPC
Fast, reliable same-day EPC services
Detailed assessments that highlight hidden energy efficiency issues
Transparent pricing and expert advice for homeowners and landlords
Support in preparing documentation to improve EPC ratings
Conclusion
Thermal bridging is a subtle but powerful factor that can reduce your EPC rating, increase energy bills, and compromise comfort. Identifying and addressing these hidden energy leaks is essential, especially for renovated homes or extensions.
If you want an accurate EPC and expert advice on minimising thermal bridging, contact Urgent EPC today.
