The Planning and Infrastructure Act 2025 (PIA) has set out an
ambitious range of planning reforms, and 18 February 2026 marked a
significant step with many provisions of the the PIA now formally
in force. However, not all are fully "in effect". This
post highlights those changes in force, and sets out those
prospective changes that await further implementation.
In force and in effect
Extension of implementation periods on judicial
review
Where a planning permission is subject to legal challenge,
section 56 of the PIA extends the time for implementing a planning
permission (or listed building consent). If permission is granted
for judicial review, the time frame for implementation will be
extended by one year in the case of High Court proceedings, an
additional year if the case goes to the Court of Appeal, and a
further two years if the case goes to the Supreme Court (so, up to
four years in total, but only three if the case goes straight from
the High Court to