Discharging conditions or applying to vary them
An approval of details application and a section 73 variation do different jobs. Getting the choice wrong costs eight weeks, and on a pre-commencement condition it can leave a permission unimplemented.
Discharge of conditions and a section 73 variation answer different questions. A discharge application asks the council to approve the details a condition told you to submit. A section 73 application asks it to change the condition itself, which produces a brand new planning permission sitting alongside the original. Choosing the wrong one costs you eight weeks and, on a pre-commencement condition, can leave the whole permission unimplemented.
What a discharge application actually decides
The formal name is an application for approval of details reserved by condition. You are not asking whether the condition was reasonable. You are submitting the material the condition requires, and the officer decides whether it satisfies what the condition asked for.
That framing matters when a condition is drafted badly. If a condition requires a scheme of external lighting to be approved and your scheme has no external lighting, the answer is a short statement saying so, not an argument that the condition should never have been imposed. Officers can and do approve a nil return.
Conditions requiring approval "prior to commencement" have to be discharged before any material operation begins. Demolition, site clearance and the laying out of an access can all count. Where the works needed are covered by permitted development or by a separate prior approval, check whether prior approval or a full application is the cleaner route before relying on the conditioned permission. Starting work with an outstanding pre-commencement condition risks the development being unlawful, and in the worst case the permission expiring unimplemented because the works carried out did not amount to a lawful start.
Since the Neighbourhood Planning Act 2017 inserted section 100ZA into the Town and Country Planning Act 1990, a council in England cannot impose a pre-commencement condition without the applicant's written agreement, subject to the prescribed procedure. Use that at the decision stage. It is far easier to object to a pre-commencement condition before it is imposed than to unpick it afterwards.
When a condition cannot be complied with as drafted
Sometimes the details you want to submit do not fit the condition. A condition names a specific brick; the manufacturer has discontinued it. A condition fixes opening hours and the tenant needs an extra hour on Saturdays. A condition ties the development to drawing numbers and the drawings have moved on.
That is section 73 territory. Section 73 of the 1990 Act lets you apply for permission to develop without complying with a condition attached to an earlier permission. If the council agrees, it grants a new permission subject to the conditions it thinks fit, and the original permission survives. You end up holding two permissions and needing to be clear about which one you are building out.
Two limits catch people. Section 73 cannot be used to alter the description of development, which the Court of Appeal confirmed in Finney v Welsh Ministers [2019] EWCA Civ 1868, so a change that makes the description inaccurate needs a fresh full application. And section 73(4) prevents the route being used where the time limit for implementation in the original permission has already passed.
The Levelling-up and Regeneration Act 2023 inserted a new section 73B allowing variations that do not substantially differ from the existing permission, including changes to the description. Those provisions have been brought into force in stages, so check the current position on legislation.gov.uk before advising a client, and state the date on which you checked. Where the change is trivial, section 96A or section 73 is the comparison to work through first.
Deemed discharge and where it applies
If the council does not determine a discharge application within the statutory period, section 74A of the 1990 Act allows the applicant to serve a deemed discharge notice, and the condition is then treated as discharged. It is a useful backstop on a stalled application.
It is also narrower than it looks. The Development Management Procedure Order 2015 excludes whole categories, including conditions on development subject to environmental impact assessment, conditions relating to flood risk, highways, contaminated land and biodiversity, and conditions requiring a scheme secured by a section 106 obligation. The notice timing is prescribed and unforgiving, so read the procedure in full before you rely on it.
In practice, most consultants use the threat rather than the mechanism. A polite reminder that the statutory period expired three weeks ago moves more files than a notice does.
Fees and periods for each route
| Route | What it delivers | Statutory period |
|---|---|---|
| Approval of details reserved by condition | Approval of the submitted details only | Eight weeks |
| Section 73 variation | A new planning permission with the condition changed | Eight weeks for minor development |
| Section 96A non-material amendment | A change to the existing permission, no new permission | 28 days |
Fees for discharge applications are charged per request rather than per condition, so grouping conditions into a single submission saves money, and a request can cover several conditions at once. Planning fees in England are set by regulations and have been indexed annually since April 2025, so quote the current schedule on GOV.UK rather than a figure from an old file note.
A section 73 application attracts the fee for the type of development, which on a large scheme is a real number. That alone often decides whether a client lives with an awkward condition.
Breach of condition and its consequences
A condition breached is a breach of planning control. The council can serve a breach of condition notice under section 187A of the 1990 Act, and there is no right of appeal to the Planning Inspectorate against one. The only routes are compliance, an application to vary, or a challenge in the courts.
Enforcement time limits also changed. The Levelling-up and Regeneration Act 2023 moved the immunity periods for breaches in England, so the old four-year rule for operational development and change of use to a single dwelling no longer applies in the way many practitioners remember. Check the position for the date the breach began rather than assuming.
Conditions on a section 73 permission
This part surprises clients. When a council grants a section 73 permission, it re-imposes the conditions it considers appropriate, and those conditions are attached to a new permission with its own decision notice.
Two consequences follow. First, conditions you had already discharged on the original permission are usually re-imposed on the new one, and strictly they need discharging again unless the council words them to recognise previous approvals. Ask for that wording in your covering letter. Second, the new permission carries the original implementation deadline, so a section 73 granted late in a permission's life does not buy extra time.
Community Infrastructure Levy liability can also be recalculated on a section 73 permission. On a scheme with a levy charge, get that checked before submitting.
Planning the discharge programme before work starts
Read the decision notice the day it arrives and build a schedule. For each condition, record whether it is pre-commencement, pre-slab, pre-occupation or ongoing, what evidence it needs, who produces that evidence, and how long that person needs. Ecology and arboriculture items have survey seasons attached; drainage items may need a consultee sign-off that takes longer than the eight week period.
An illustrative example. On a nine unit scheme, a condition requires a construction environmental management plan before commencement, another requires a bat mitigation strategy informed by emergence surveys, and a third requires materials samples before the superstructure. The bat surveys can only be done between May and September. If the permission lands in October and the client wants to start in February, the discharge programme, not the build programme, controls the start date.
Where a scheme is still at outline stage, distinguish conditions from reserved matters altogether. The difference between an outline permission and permission in principle changes what you submit and when.
PlanScope drafts the supporting statements that sit behind many of these submissions, structured to UK planning policy and flagged where site facts are missing. Browse the report types on PlanScope and start a draft.
This is general guidance, not legal advice. Check the position with your local planning authority or 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
Can I start work if one pre-commencement condition is outstanding?
No, not safely. A condition worded to require approval before development begins must be discharged first, and demolition, site clearance or laying out an access can all amount to a material operation. Work started in breach may not count as a lawful implementation, which can leave the permission to expire. Get the condition discharged or agree a variation first.
Do I pay a fee for each condition I want discharged?
The fee is charged per request rather than per condition, so several conditions can be grouped into one submission. Planning fees in England are set by regulations and have been indexed annually since April 2025, so check the current schedule on GOV.UK before submitting rather than relying on a figure from an earlier project.
Does a section 73 permission replace the original one?
No. Section 73 grants a new permission that sits alongside the original, which remains extant. You need to be clear which permission you are building out, because the conditions differ. The new permission also carries the original implementation deadline, so it does not extend the time available to start.
Can section 73 be used to change the description of development?
Not under section 73 itself, following the Court of Appeal in Finney v Welsh Ministers. The Levelling-up and Regeneration Act 2023 inserted a new section 73B intended to allow variations that do not substantially differ, including to the description. Those provisions came into force in stages, so check the current position on legislation.gov.uk and record the date you checked.
Is there an appeal against a breach of condition notice?
There is no appeal to the Planning Inspectorate against a breach of condition notice served under section 187A of the Town and Country Planning Act 1990. The options are to comply, to apply under section 73 to vary the condition, or to challenge the notice in the courts. Prosecution follows continued non-compliance.
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.