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  3. Wales Approved Document Part D: Toxic substances

Wales Approved Document Part D: Toxic substances

Welcome to the technical guidance page for Part D of the building regulations (Wales).

This section contains guidance on toxic substances within buildings - in particular it deals with the injection of urea formaldehyde foam into cavity walls. The Approved Document D (Wales) can be downloaded below.

Part D

Wales Approved Document Part D: Toxic substances

1992 edition incorporating 2002 and 2010 amendments

Download now

Building Regulations guidance

Browse the full suite of Approved Documents for England and Wales plus additional guidance, our resource library, statutory and archive documents.
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      • What's the process for transferring work from an AI that no longer has insurance to an LABC team?
      • Why does the project have to be reverted to the local Authority?
      • What does it cost to cancel an initial notice and revert work to my local council?
      • Why do I have to pay twice – once for the Approved Inspector and then for the LABC team?
      • What will the local authority surveyor do?
      • Can Approved Inspectors continue without the required insurance?
      • What is the status of any regulatory work done in a period where an Approved Inspector fails to secure renewal of their insurance?
      • Does a cancellation notice have to be issued by the Approved Inspector?
      • What information should I request from the Approved Inspector when reverting a project to the local council?
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