Conventions V12.1 – What Domestic Energy Assessors Need to Know
The Conventions for RdSAP are updated periodically to ensure consistency in how Domestic Energy Assessors (DEAs) record and interpret data. As of 21 August 2025, conventions V12.1 for DEAs is the current standard, replacing earlier versions. It is important that all DEAs are working in line with this version, as it sets the expectations for how assessments should be carried out and ensures certificates are compliant.
Why the Conventions Matter
Conventions provide the detailed guidance that underpins the EPC process. While RdSAP software captures the data, the conventions explain how specific scenarios should be handled. From window measurements to heating system classifications, they standardise practice across the industry. If you are not working from the correct version, there is a risk of inconsistency or even non-compliance in your reports.
Confirming You Are Using Conventions V12.1
DEAs should not assume their knowledge is up to date. Even experienced assessors need to check regularly that they are working with the correct guidance. The latest conventions V12.1 for DEAs, was published on 21 August 2025 and applies to all domestic assessments going forward. You can download the official version directly from your accreditation body’s portal or from BRE’s resources.
Practical Tips for DEAs
From an experienced assessor’s perspective, the most effective way to stay aligned with the conventions is to make checking for updates part of your routine. Log into your accreditation body’s member area at least once a month and take note of any communications they issue. It is also worth saving a copy of the current conventions to a folder on your laptop or tablet, so you can quickly confirm details if you are unsure while on site.
Another useful tip is to keep a record of when the conventions change and how that might affect your data collection. For example, if a convention changes how certain heating systems should be recorded, make a note in your survey checklist so you avoid slipping back into outdated habits.
Continuous Professional Development
Aligning with the latest conventions is not just a compliance requirement; it should also be part of your wider CPD. Refreshing your knowledge when new versions are released is an opportunity to reflect on your practice and identify areas where you might improve accuracy or efficiency. Accreditation bodies and training providers often offer CPD modules linked to convention updates, which can help embed the changes in your day-to-day work.
Final Thoughts
Conventions version 12.1 is now the live standard for all domestic EPC assessments. Ensuring you are working with the correct version is a straightforward but vital step in maintaining compliance and delivering reliable assessments. Make it part of your routine to confirm updates, download the latest documents, and treat each release as an opportunity for professional growth.
