RdSAP Is Changing – Here’s What You Need to Know

Everything You Need to Know About RdSAP 10 and How It Impacts Energy Assessments, EPCs, and Retrofits Planning

If you work in the world of energy assessments, retrofitting, or renewable installations – or if you’re a homeowner planning energy efficiency upgrades – it’s time to take note: RdSAP 10 launched on 15 June 2025.

This update to the Reduced Data Standard Assessment Procedure (RdSAP) is a significant step forward, bringing better accuracy, greater recognition of renewable technologies, and improved regional data to the Energy Performance Certificate (EPC) process.

As the official method for assessing the energy performance of existing dwellings in the UK, RdSAP plays a crucial role in how we evaluate and plan energy efficiency improvements. At OHM Energy, we’re here to help you understand what’s changing – and why it matters.

What Is RdSAP?

RdSAP (Reduced Data Standard Assessment Procedure) is the simplified version of SAP (Standard Assessment Procedure), used specifically for existing buildings. It’s the foundation for producing Energy Performance Certificates (EPCs) – a requirement for selling, renting, or upgrading a home in the UK.

RdSAP assessments help identify:

A property’s current energy efficiency rating
Potential improvements and estimated savings
Suitability for renewable upgrades like solar panels, heat pumps, or battery storage

What’s Changing in RdSAP 10?

The new RdSAP 10 update brings several enhancements to improve accuracy, reflect modern technologies, and align with the UK’s evolving energy landscape.

Key Updates in RdSAP 10:

New Age Bands: More precise dating of property construction for improved accuracy in assumptions about materials and insulation.
Updated Regional Weather Data: Assessments now factor in more localised climate variations, leading to more realistic modelling of heating demand.
Recognition of Renewable Technologies: RdSAP 10 introduces better integration of solar PV, battery storage, and low-carbon heating systems.
Improved Heating System Categories: Expanded options to better reflect modern heating systems, including hybrid and zoned systems.
More Detailed Energy Usage Modelling: Enhanced algorithms to better reflect real-world household energy consumption patterns.

Why This Is Important for Installers, Homeowners & Retrofit Professionals

Whether you’re a renewables installer, EPC assessor, retrofit coordinator, or a homeowner looking to future-proof your property, RdSAP 10 offers a more accurate and forward-thinking framework for assessing home energy performance.

For professionals, this means:

Better alignment with PAS 2035 and retrofit assessment standards
Improved targeting for government incentives and funding
Clearer data to support recommendations for solar PV, EV chargers, and battery storage installations

For homeowners:

More accurate EPCs to guide investment in home upgrades
Improved energy advice based on your actual location and property type
Greater visibility of the benefits of renewable technologies

Get the Full Picture: RISE Advice Pack Available Now

To help professionals across the energy and retrofit sectors get up to speed, we recommend downloading the RISE RdSAP 10 advice pack here. It outlines the updates in detail and explains how these changes will affect:

Manufacturers & product specifiers
Retrofit installers & surveyors
EPC assessors & coordinators
Homeowners & landlords
Local authorities & compliance bodies

At OHM Energy, We’re Ready for What’s Next

As a trusted renewable energy installer serving Sussex, Surrey, and Kent, OHM Energy stays ahead of industry changes – so you don’t have to. Whether you’re installing solar, upgrading to a heat pump, or planning a full retrofit, we’ll ensure your project aligns with the latest RdSAP standards and EPC requirements.

📞 Want advice on making your home energy-efficient or future-ready?

Tel: 01323 739474

Email: hello@ohmenergy.co.uk

OHM Energy – Helping Homes & Businesses Transition to Smarter, Greener Energy.