10/12/2025
🌱 Big News for Home Energy Ratings: RdSAP 10 Is Here! 🏡⚡
If you’re a homeowner, landlord, or in the property/energy sector, you’ll want to know about the brand-new RdSAP 10 update — the biggest change to home energy assessments in years!
Here’s what’s new ⬇️
🔹 More Accurate EPCs
RdSAP 10 brings improved modelling of how homes actually use energy — meaning EPC ratings are now more reflective of real-world performance.
🔹 Room-by-Room Assessment
Assessors can include more detailed data about individual rooms, giving a clearer picture of insulation, heating, and overall efficiency.
🔹 Better Heat Pump Modelling
The update supports more realistic predictions for heat pump performance (great news for anyone considering low-carbon heating!).
🔹 Updated U-Values & Insulation Options
New and more accurate U-values for walls, floors, and roofs — especially helpful for older homes that don’t fit standard assumptions.
🔹 Renewables Captured in More Detail
Solar PV, battery storage, and other renewables now feed into EPC ratings more precisely.
🔹 Improved Ventilation & Air Tightness Data
RdSAP 10 places greater emphasis on ventilation strategy, including MEV/MVHR systems and air leakage considerations.
🔹 More Property Types Supported
Period properties, hybrid heating systems, and non-traditional builds are now better represented within the calculation engine.
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💬 What this means for you:
✔️ More accurate EPC results
✔️ Better recommendations for upgrades
✔️ Stronger support for low-carbon technologies
✔️ Future-proof assessments aligned with Net Zero goals
If you're planning to sell, let, or improve your home — or you're an assessor keeping up with changes — RdSAP 10 is a game changer.