Heritage buildings often present a unique challenge when it comes to Energy Performance Certificates (EPCs). These properties are renowned for their architectural charm but are equally infamous for their poor energy efficiency ratings. Many owners turn to underfloor heating systems (UFH) as a discreet, space-saving solution that preserves period aesthetics. But does underfloor heating help or hinder your EPC rating?
At EPCrate, we frequently assess heritage properties with underfloor heating and advise clients on how such systems are treated within EPC assessments.
Why Heritage Buildings Struggle with EPC Ratings
Historic buildings often suffer from:
Solid stone or brick walls with poor insulation.
Single-glazed windows with preservation restrictions.
Air leakage through aged construction details.
Restrictions on external insulation or modern interventions.
All these factors mean that achieving a high EPC rating requires careful, sympathetic upgrades—one of which is often underfloor heating systems.
Does Underfloor Heating Improve EPC Ratings in Heritage Buildings?
It depends.
While underfloor heating provides even, low-temperature heat distribution, the EPC software prioritizes:
The efficiency of the heat generator (boiler or heat pump).
The heat emitter type (radiators vs underfloor pipes).
The U-values of floors, walls, roofs, and glazing.
Key EPC Implications:
Underfloor heating alone does not dramatically improve EPC scores unless paired with an efficient heat source (like an air-source heat pump).
If UFH is connected to a standard gas boiler, EPC software may still rate the system as moderate in efficiency.
Electric underfloor heating often receives a lower efficiency score in EPC calculations due to electricity’s higher carbon factor, unless powered by on-site renewables.
The floor’s insulation quality is critical. If UFH is installed on an uninsulated floor slab, heat losses can negate the efficiency gains.
Advantages of UFH in Heritage Buildings (Beyond EPC)
Maintains period aesthetics by eliminating the need for radiators.
Provides a more comfortable, even heat distribution.
Works well with low-temperature heat sources, making it suitable for future upgrades (e.g., heat pumps).
However, EPC assessments don’t factor in these lifestyle or architectural benefits—only measurable energy efficiency improvements.
Best Practices to Ensure UFH Positively Affects EPC Ratings
Pair UFH with High-Efficiency Boilers or Heat Pumps:
The emitter’s efficiency depends largely on the heat generator’s performance.Upgrade Floor Insulation During Installation:
Document improved U-values post-UFH installation to ensure assessment credits.Provide Full System Specifications:
Ensure you supply EPC assessors with documentation on UFH layouts, control systems, and heating curves.Consider Bespoke SAP Assessments for Complex Cases:
For listed properties or heritage buildings, a bespoke SAP calculation may yield a more accurate rating than a simplified RdSAP survey.
EPCrate’s team is experienced in heritage EPC assessments, ensuring that sympathetic upgrades like UFH are properly accounted for.
EPC Limitations & Legal Exemptions for Heritage Buildings
While improving EPC ratings is beneficial, many heritage properties may be eligible for EPC exemptions if:
Energy improvements would unacceptably alter their character.
Compliance is deemed technically unfeasible or disproportionately costly.
EPCrate can advise on whether your heritage property qualifies for exemptions or if alternative assessment routes (e.g., bespoke SAP) would be more suitable.
Book a Heritage Property EPC Assessment with EPCrate
Whether you’ve already installed underfloor heating or are planning energy upgrades in a listed building, book an EPC assessment with EPCrate for expert guidance.
Check our specialised pricing for heritage and complex EPC cases, and ensure your property is assessed with precision.
Suggested Enhancements for This Article:
