With the upcoming release of a new version of the Reduced Data Standard Assessment Procedure (RdSAP), we understand that this may raise questions and concerns. These updates will reshape how energy efficiency scores are calculated, potentially impacting eligibility for funding and the way retrofits are planned and assessed. Rest assured – VOR has the knowledge, experience, and expertise to navigate these changes smoothly, keeping your projects on track and aligned with updated requirements.
The new version of RdSAP, the UK’s standard for assessing energy performance in existing homes, is designed to enhance accuracy and better align with SAP 10 (the Standard Assessment Procedure used for new builds), bringing greater detail and precision to energy assessments through updated data collection and calculation metrics.
Key changes include updated calculation metrics and new scoring methods, which are intended to more accurately reflect real-world energy performance. These improvements will affect EPC (Energy Performance Certificate) scores, potentially altering outcomes compared to previous versions and introducing some complexity for projects that rely on specific EPC thresholds. For retrofit projects, this means a careful reassessment of energy efficiency measures will be necessary to ensure compliance without overshooting budget caps or missing critical targets.
What’s Changing with RdSAP?
Here’s a look at some of the key changes and what they mean for retrofit projects:
- New Calculation Metrics: Assessors will now measure all windows individually, improving accuracy by reflecting the actual glazing of each property. Additional data points will be collected for roof rooms, capturing variations in construction types for common and gable walls. For properties equipped with PV diverters or battery storage, these systems can now be included in the evaluation, allowing for a more comprehensive assessment. Updated energy factors are also being introduced to ensure calculations align with the latest energy data, directly influencing EPC (Energy Performance Certificate) ratings.
- Inconsistent EPC Scores: Currently, a property modeled in RdSAP 2012, SAP 2012, and SAP 10 could yield different EPC results, potentially creating confusion around energy efficiency scores. With RdSAP 10, properties will need to be assessed using the new software, which may produce varied outcomes compared to previous versions.
- Implications for Funding: Given the new EPC standards, properties targeting an EPC rating of C for programmes like the Warm Homes: Social Housing Fund (SHDF) will require careful planning and product selection to ensure compliance without exceeding cost caps.
At VOR, we understand how to interpret these shifts, ensuring your project aligns with updated criteria without unnecessary cost or effort.
VOR’s Expertise: A Trusted Partner in Energy Modeling
Since participating in the pioneering SHDF Demonstrator projects in 2021, VOR has been involved in every SHDF programme iteration, delivering successful energy modeling across a diverse range of projects with varied scopes. This extensive experience has deepened our expertise in both RdSAP and SAP modeling, enabling our team to navigate updated versions with ease and provide precise, regulation-compliant energy assessments for your retrofit projects.
Expert Guidance in Energy Efficiency Measures (EEMs):
- Strategic Product Selection: Selecting the right retrofit measures is crucial to achieving optimal EPC ratings under the new guidelines. The government promotes air source heat pumps (ASHPs) as a low-carbon heating solution, and at VOR, we’re strong advocates of their benefits. However, the impact of an ASHP on EPC ratings can vary significantly depending on the model selected and the specific characteristics of the property. In fact, we’ve observed score variations of up to 6-8 points based on the type of ASHP installed. Our team leverages this expertise to recommend solutions that meet your energy targets while maximising cost-effectiveness.
- Avoiding Score Reductions: Some Energy Efficiency Measures (EEMs) can unintentionally reduce EPC scores if not carefully considered. For instance, adding a ventilation system to a home that relies solely on natural ventilation can sometimes lower the EPC score by up to 3 points. We understand just how important a well-designed ventilation strategy is, and along with our thorough understanding of ventilation’s role in overall efficiency, we ensure each measure aligns with your project’s energy goals, optimising both performance and funding potential.
Planning for Success with Built-in Contingency
The changes in RdSAP methodology underscore the importance of planning. Projects aimed precisely at achieving an EPC rating of C risk falling short as software updates and measurement variances come into play. VOR prioritises built-in contingencies in our models, leaving headroom to accommodate potential score variations. By not modeling a retrofit scheme right at the edge of an EPC rating threshold, we safeguard your funding eligibility, ensuring compliance with future adjustments in RdSAP criteria.
Your Retrofit Project in Expert Hands
At VOR, our commitment to excellence ensures that our team is fully equipped to navigate the upcoming RdSAP changes. We are dedicated to providing comprehensive support throughout your retrofit journey. With our extensive experience and proactive approach to adapting to industry shifts, we stand as your ideal partner for successful retrofit projects.
