Section 73 applications and which reports must be refreshed
A section 73 application produces a new permission in today's policy context, so regulatory change and expired surveys can expand the evidence base even for a trivial variation.
Section 73 reports required for a variation application are the ones that policy or regulation has changed since the original grant, plus any whose underlying survey data has expired. A section 73 application produces a brand new planning permission rather than an amendment to the old one, which is why the evidence base can expand even when the physical change is trivial. Applicants who expect to submit a short covering letter and one revised drawing are regularly surprised.
Scope control is the whole skill here.
What a section 73 application re-opens
The application is for permission to develop without compliance with a condition previously imposed. The authority considers only the question of the conditions, and may grant permission subject to different conditions or to none, or refuse.
Two limits matter. The description of development cannot be changed through this route, so a variation that alters what the permission is for has to go in as a fresh application. And the resulting permission stands alongside the original, which continues to exist, so a developer can end up holding two permissions and needs to be clear which is being implemented.
Because the output is a new permission, it is granted in the current policy context. That is the mechanism by which new requirements arrive. The authority is not reassessing the principle of development, and should not be, but it is issuing a permission today and has to attach the conditions today's regime requires.
A further route under section 73B was created by the Levelling-up and Regeneration Act 2023 for changes that are not substantially different. Check whether it is in force and how your authority is operating it before assuming it is available.
Reports that are pulled in by regulatory change
These are the ones that catch people out, because they have nothing to do with the change being applied for.
Biodiversity net gain is the obvious example. The biodiversity gain condition can attach to a section 73 permission, with transitional rules that depend on when the original permission was granted and what it contained. The rules are detailed and have been amended, so check the current regulations rather than assuming either outcome. Where it applies, a Biodiversity Net Gain Assessment using the statutory metric is needed, completed by a competent person, and the gain plan has to be approved before development begins.
Fire safety is the second. Where the scheme is a relevant building by height or storey count, an application made now engages the Fire Statement requirement even if the original predated it. That brings the Health and Safety Executive in as a consultee on an application the applicant expected to be routine.
Climate change allowances for flood risk are revised periodically, so a drainage and flood risk case accepted several years ago may not pass against the current figures. Energy and overheating requirements move with the Building Regulations.
Survey expiry and the re-survey decision
The second category is evidence that was fine when submitted and has aged.
Ecology ages fastest. A protected species survey supporting a permission granted four years ago will not support a new permission without a current view, and where bats or newts were recorded the survey seasons govern the programme rather than the planning timetable.
Arboricultural information ages more slowly but does age, and a tree survey that recorded a category B specimen which has since declined or been removed produces an inconsistency an officer will notice.
Transport baselines, air quality baselines and noise baselines all have a shelf life that varies with how much the surroundings have changed. Where nothing has changed, say so with reasons rather than silently reusing the document. A single paragraph confirming that the junction, the traffic counts and the committed development schedule are unaltered will usually satisfy a highway officer who would otherwise ask for a new survey.
Three questions settle each dataset: has the site changed, has the surrounding baseline changed, and has the method or standard changed. Record the answers in a short validity statement at the front of the submission.
What can be carried forward unchanged
Plenty, and saying so explicitly keeps the application small.
| Usually carried forward | Usually refreshed |
|---|---|
| Heritage significance and archaeological assessment | Ecology surveys and biodiversity evidence |
| Contamination assessment where remediation is approved | Flood risk where allowances have been revised |
| Site description and planning history | Energy and overheating where regulations moved |
| Design rationale for unchanged elements | Anything the varied condition directly affects |
Submit the carried-forward documents by reference rather than by resubmission where the authority permits it. Listing them in a schedule with their original application reference and date is tidier than attaching 200 pages the officer has already read, and it signals that the scope is narrow.
Drafting so the scope stays narrow
The submission should answer three questions on its first page: which condition, what change, and why nothing else is affected.
A side-by-side comparison of consented and proposed, drawing by drawing and figure by figure, does more work than any amount of narrative. Where a dimension is unchanged, show it unchanged.
State explicitly that the description of development is unaltered and that the application does not seek to revisit the principle. Officers faced with a vague section 73 submission sometimes reassess matters that were settled, and a clear framing discourages that. It also helps the officer write a short report, which is in everybody's interest.
Where the authority proposes to re-impose the full original condition set, read it. Conditions that were discharged on the original permission will usually be re-imposed on the new one, and a permission carrying undischarged versions of conditions you satisfied two years ago creates a problem on site. Ask for those conditions to be worded to recognise the earlier discharge, or for the decision to record it.
Fees, levy and the documents to submit
The fee for a section 73 application is set nationally and is modest relative to the work. The Community Infrastructure Levy position is not trivial, since a new permission triggers a recalculation with credit for the original, and where floorspace or use has changed the liability moves.
A workable document set for a straightforward variation:
- Application form and the current certificate of ownership, which has to be completed afresh.
- Site location plan and the revised drawings, with a schedule showing superseded and replacement references.
- A short Planning Statement explaining the condition, the change and the scope.
- A validity statement covering every carried-forward dataset.
- Only those technical documents that the regulatory changes or the survey review have shown to be necessary.
Resist the temptation to submit everything. A thick application invites a thorough reassessment, which is precisely what a section 73 applicant does not want.
One caution on timing. A section 73 permission carries its own implementation period, and on an older original that period can be shorter than the applicant assumes, because the authority may tie it back to the date of the original grant. Read the time limit condition on the draft decision rather than the standard wording you expect.
This is general guidance, not legal advice. Check the position with your local planning authority or a qualified professional before relying on it.
Browse the 66 report types to see which evidence a variation to your permission is likely to pull in.
PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval. For specialist technical reports, qualified professional input may be required.
Frequently asked questions
Can section 73 be used to change the description of development?
No. The route is for developing without complying with a condition previously imposed, and the courts have held that it cannot be used to alter the description of development itself. A change that alters what the permission is for has to be made through a fresh application rather than a variation.
Does biodiversity net gain apply to a section 73 permission?
It can, and the transitional rules depend on when the original permission was granted and what it contained. Those rules are detailed and have been amended since the regime began, so check the current regulations rather than assuming either outcome. Where the condition applies, the statutory metric and an approved gain plan are required.
Why does a variation trigger a Fire Statement?
Because the application produces a new permission granted in today's regulatory context. Where the building meets the relevant building test on height or storey count, the Fire Statement requirement is engaged even if the original permission predated it, which brings the Health and Safety Executive in as a consultee.
Do conditions already discharged get re-imposed?
Usually yes, because the new permission carries its own condition set. That can leave you holding a permission with undischarged versions of conditions you satisfied years ago. Ask for the wording to recognise the earlier discharge, or for the decision notice to record it, before the decision is issued rather than after.
Does a section 73 permission change the Community Infrastructure Levy position?
It triggers a recalculation, with credit given for the original permission. Where floorspace, use or the applicable rates have changed, the liability moves. Check the position before submitting, particularly where an exemption or relief was claimed on the original, since the paperwork may have to be repeated.
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.