Transitional provisions and which rules apply to you
A planning reform almost never applies to everything at once. The answer to which version applies is usually sitting in a commencement order most people never open.
Planning reform transitional provisions decide which version of a rule applies to your application, and the answer is almost never the version in the news coverage. An Act receives Royal Assent, a handful of sections take effect immediately, most wait for regulations, and the regulations that eventually bring them into force carry savings and transitional provisions keyed to a date. That date is usually the date the application was made, or the date an appeal was received, or the date a plan was submitted for examination. Rarely the date of the decision.
Getting this wrong produces confident advice that is out of date in one direction or premature in the other. Both are damaging, and the premature version is worse, because it puts a claim in a planning statement that the case officer can disprove in a minute.
Why a reform rarely lands all at once
A modern planning Act is a collection of powers rather than a single switch. Some provisions are self-executing. Others give the Secretary of State a power to make regulations, and until those regulations exist the provision changes nothing on the ground.
The Levelling-up and Regeneration Act 2023 is the clearest recent illustration. It contains powers on plan-making, national development management policies, enforcement, the Infrastructure Levy and street votes, and those parts have moved at very different speeds. A provision can sit on the statute book for years while the underlying regime carries on unchanged, which is why the street votes power in the 2023 Act and its status is a useful example to keep in mind before citing anything from that Act as current law.
The practical rule is simple. A section printed in an Act is not necessarily in force. Check before relying on it, and say in your advice whether you checked and when.
Reading a commencement order
Commencement instruments are short and they follow a pattern. Once you know the pattern they take five minutes.
The title tells you a lot on its own. Something like the Act 2023 (Commencement No. 4 and Transitional Provisions) Regulations tells you it is the fourth tranche and that it carries transitional material. Inside, the structure usually runs:
- Citation and interpretation, including the definitions used in the transitional articles.
- An article appointing a day for named provisions to come into force, often with different days for different purposes.
- Savings, which preserve the old law for a defined category of case.
- Transitional provisions, which set out how the new regime applies to things already under way.
- A schedule listing the provisions brought into force, where the list is long.
Read the transitional article twice and note the trigger it uses. Applications made before a date, applications not determined before a date, appeals received on or after a date and development begun before a date all produce different answers for the same scheme. The explanatory note at the end of the instrument, and the explanatory memorandum published alongside it, restate the effect in plainer words and are reliable for orientation, though they are not the law.
Where a provision is brought into force for some purposes only, the instrument will say so, and that phrase should stop you rather than reassure you.
Applications made before a change takes effect
Two different mechanisms are at work, and conflating them is the most common error.
Policy works one way. Section 38(6) of the Planning and Compulsory Purchase Act 2004 requires determination in accordance with the development plan unless material considerations indicate otherwise, and the assessment is made at the date of the decision. A new edition of the National Planning Policy Framework published after your application was validated is therefore a material consideration in the determination of that application, subject to whatever transitional arrangements the new edition itself sets out. Successive editions have carried their own arrangements, typically keyed to whether a local plan was submitted for examination before a stated date.
Legislation and procedure work the other way. Changes to permitted development classes, application procedure, validation requirements or fees usually carry express transitional provisions tied to the date the application was made. A change to a class in the permitted development order does not retrospectively unmake a lawful development that was already begun, and the amending instrument will normally say so.
The practical consequence for a consultant is that you assess policy at decision date and procedure at submission date, unless the instrument tells you otherwise. Where those two produce an awkward result, say so in the planning statement rather than hoping it goes unnoticed.
Appeals decided under earlier rules
Appeal procedure rules are amended reasonably often, and the amending instruments almost always distinguish appeals received before the commencement date from those received on or after it. An appeal lodged under the old rules generally proceeds under them.
The substantive policy position is different again. An inspector determines the appeal on the policy applying at the date of their decision, so a Framework revision published while an appeal is in the system is relevant to it. Where that happens, the Inspectorate will usually invite the parties to comment on the implications, and a party that does not respond loses the chance to shape how the change is applied.
So keep an eye on the policy position after you lodge, not just before. An appeal that runs for eight months can cross a policy change without anyone in the team noticing.
Conditions imposed under provisions since repealed
A condition imposed lawfully under a power that has since been repealed remains a valid condition. It does not fall away with the power.
Interpretation is the interesting part. A condition is construed by reference to the permission it was attached to and the law as it stood when it was imposed, which is why old permissions sometimes contain conditions phrased in terms that no longer exist anywhere in current legislation. Conditions removing permitted development rights by reference to classes that have since been renumbered are the everyday example, and they still bite even though the class letters have moved.
When varying such a condition under section 73, or seeking a certificate to confirm what it means, set out the historic provision as it stood and explain the renumbering. Do not silently translate it into modern language. The drafting discipline in planning conditions and the national restrictions on drafting applies just as much to reading old conditions as to writing new ones.
The same point runs through use class changes. Understanding what a permission granted for a former class actually authorises now depends on the transitional and interpretive provisions in the amending order, which is the ground covered in what the 2020 amendment changed for Class E.
Recording the version you relied on
Write a short baseline note at the front of every file and update it at submission and at decision. Six lines is enough:
- The date of the note.
- The edition of the National Planning Policy Framework relied on, by publication date.
- The adopted development plan documents and their adoption dates, plus any emerging plan and its stage.
- Each statutory instrument relied on, cited by full title and year, with the words as amended to and a date.
- Any provision relied on that is not yet in force, flagged as such.
- The date each of those was last verified against legislation.gov.uk.
One caution about that last line. Revised versions on legislation.gov.uk carry a notice where there are outstanding effects still to be applied, and the timeline of changes shows which version you are looking at. A revised text is extremely useful and it is not always fully up to date, so on a contentious point read the amending instrument itself alongside the consolidated text.
That note takes ten minutes to maintain and it answers the question that arrives two years later, when someone asks why the statement cited the rule it did. It also protects a junior colleague who inherits the file. The planning law updates timeline is a place to follow reform news, though for anything you intend to rely on, go to the instrument.
This is general guidance, not legal advice, and the position on any particular reform changes as commencement regulations are made. Check the current text on legislation.gov.uk and take advice from a qualified professional before relying on it. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.
Frequently asked questions
How do I find out whether a section of an Act is in force?
Open the section on legislation.gov.uk and check the commencement information attached to it, then look at the list of commencement orders made under the Act. Where the section is brought into force for some purposes only, the instrument will say so. A provision printed in an Act is not necessarily operative.
Does a new NPPF edition apply to an application already submitted?
Generally yes, as a material consideration, because the decision is taken on the policy position at the date of determination under section 38(6) of the Planning and Compulsory Purchase Act 2004. Each edition also sets out its own transitional arrangements, most often for plan-making rather than for decision-taking, so read those directly.
What is the difference between a saving and a transitional provision?
A saving preserves the old law for a defined category of case, so that category continues to be governed by the repealed provision. A transitional provision bridges the two regimes, explaining how the new rules apply to matters already under way. Commencement instruments frequently contain both, in separate articles.
Are conditions on old permissions still enforceable after the power is repealed?
Yes. A condition lawfully imposed remains valid and is interpreted by reference to the law as it stood when it was imposed. Conditions referring to permitted development classes that have since been renumbered still operate, so set out the historic provision when varying them rather than translating it into current wording.
Which rules apply to an appeal lodged before a procedural change?
Amending instruments to the appeal procedure rules usually distinguish appeals received before commencement from those received on or after, so an appeal lodged under the old rules normally continues under them. Policy is different: the inspector decides on the policy applying at the date of the decision.
Sources and further reading
This article is general guidance about the planning system in England and, where stated, the rest of the UK. It is not legal or professional advice. Check your local planning authority’s validation requirements and take professional advice for your specific site.