Part 4 of the Planning and Development Act 2024 commences on 13 October 2026. The 2000 Act does not stop on that day: it continues for anything already in the system. Three questions decide which Act governs a particular file, with the section that says so.
The 2024 Act repeals the 2000 Act, but section 626 keeps the 2000 Act in force for an application for permission made before the repeal, for an application to extend a permission under section 42 made before it, for a revocation or removal notice served before it, and for an appeal under section 37 brought before it. So the date the application was lodged fixes the Act, and it stays fixed through the decision and any appeal. Separate transitional sections do the same for declarations (section 12) and enforcement (section 628). Two other dates matter: judicial review of a 2000 Act decision runs under Part 9 of the 2024 Act where the application was made on or after 12 August 2026 (section 50AA of the 2000 Act), and from 13 October a permission granted under either Act can be altered or extended under Chapter 5 of Part 4.
The deadline calculator applies the same date rule and gives every deadline on a file; what changes when Part 4 commences sets out the differences for applicants, third parties and existing permissions; the two Acts compared goes section by section.
A file lodged in the days either side of 13 October, or a permission with a request already in, is where the transitional provisions decide the outcome. The practice advises on which route applies and how to use it.