Many property owners are surprised when their Energy Performance Certificate (EPC) shows generic estimates rather than detailed data for specific elements like insulation thickness, glazing types, or heating controls. These data gaps in EPC assessments can significantly lower your property’s rating—often unfairly.
If your EPC report contains phrases like “assumed” or “default value,” it’s a sign that missing information has been substituted with penalising defaults, which can drag down your score.
Why Do EPC Assessments Have Data Gaps?
EPC assessors rely on visual inspections and documented evidence to input property details into their assessment software. Data gaps typically occur when:
No Documentation is Available: For insulation, windows, or heating upgrades.
Inaccessible Areas: Assessors can’t inspect roof spaces, walls, or sub-floors.
Limited Access to System Specifications: Boilers, ventilation systems, or renewable installations lacking manuals or compliance certificates.
In these cases, the assessor must input a default assumption, which is always on the pessimistic side to ensure compliance with assessment protocols.
How Data Gaps Lower Your EPC Rating
When assessors cannot verify certain details, the EPC software applies conservative default values, such as:
“No insulation present” for inaccessible lofts.
Single-glazing defaults if no window specs are provided.
Low-efficiency assumptions for unverified heating systems.
These defaults can cause a 1-2 band drop in EPC score, which could result in failing to meet Minimum Energy Efficiency Standards (MEES), affecting saleability or rental compliance.
How to Avoid EPC Data Gaps in Your Assessment
Gather Documentation: Certificates, invoices, and product specs for insulation, glazing, boilers, etc.
Ensure Access to Key Areas: Clear access to lofts, basements, and utility areas.
Pre-Assessment Property Audit: Identify any data that may be assumed and rectify with evidence before assessment.
At Urgent EPC, we guide property owners through documentation and property access requirements to ensure your EPC reflects actual performance—not assumptions.
Book a Professional EPC Assessment to Eliminate Data Gaps
Don’t let missing data unfairly penalise your EPC rating. With our same-day EPC assessments, our experienced assessors work with you to minimise data gaps and achieve an accurate rating. See our pricing plans for affordable assessment packages.
Get Tailored EPC Advice to Improve Your Rating
Concerned about data gaps on your current EPC? Contact Urgent EPC for expert advice and reassessment services that ensure every efficiency upgrade is properly recorded.
At Urgent EPC, we offer professional guidance on how to boost your EPC rating, including heating system evaluations. If you’re planning to install a heat pump or want to reassess your current EPC, we can help you get fast, certified results.
Call Us Today: +447741 812864
Email: info@urgentepc.co.uk
