Guidance
Using unbound incinerator bottom ash aggregate in construction: RPS 325
Environment Agency regulatory position on using unbound incinerator bottom ash aggregate (IBAA) in construction.
Applies to England
Documents
Details
This regulatory position statement (RPS) does not change your legal requirement to have an environmental permit for a waste operation and groundwater activity when you use IBAA in:
-
building a road, cycleway or pathway sub-base
-
building a structural platform
-
pipe bedding
However, the Environment Agency will not normally take enforcement action if you do not comply with this legal requirement if you meet the requirements in the RPS.
The regulatory position does not apply to any other legal requirements.
Updates to this page
Published 20 May 2026