Latest version: v1.2, July 2026
Guidance Note 24 (GN24) provides additional guidance to assessors and specifiers on demonstrating compliance with the ‘Measuring responsible sourcing’ criteria in BREEAM (typically in Mat 03). It should be read in conjunction with the Technical Manual for the relevant assessment scheme. It covers:
- How to deal with constituent products/materials including those with certification that is different from the overall product.
- The precision required in estimating quantities:
- For the cut-off volume
- Of products/materials in the building (Route 2 only)
- Of different material categories in products/materials.
- An example Route 2 calculation.
- ‘Broken chain’ situations.
- How to treat building services.
View all Guidance Notes on BREEAM Projects (licensed assessors only)
15-Jul-2026 - Updated version released (v1.2)
