# Planning (Wales) Act 2026, Section 140: Grounds for appeal not to be raised in other proceedings

Extent: E+W
Status: prospective

(1) The validity of an enforcement notice may not be questioned, on any of the grounds on which an appeal may be made under section 131, in any proceedings except an appeal under that section.
(2) Subsection (1) does not apply to proceedings for an offence under section 138 against a person who—
(a) has held an interest in the land to which the enforcement notice relates since before the notice was issued,
(b) was not served with a copy of the notice, and
(c) satisfies the court—
(i) that the person did not know, and could not reasonably have been expected to know, of the existence of the notice, and
(ii) that the person’s interests have been substantially prejudiced by the failure to serve a copy of the notice.

---
Source: https://www.legislation.gov.uk/asc/2026/6/section/140 (the official version)
Page: https://openlegislation.uk/planning-wales-act-2026/section-140
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.