Changing a condition an inspector imposed on appeal

An inspector who allows an appeal imposes the conditions, and once the decision letter is issued that inspector has no power to revisit it. The route to an inspector imposed condition variation is a section 73 application to the local planning authority, made under the Town and Country Planning Act 1990, which decides it as it would any other application. The only way to attack the condition itself is a statutory challenge in the High Court under section 288 within six weeks of the decision.

That split matters because developers often write to the Planning Inspectorate asking for a correction and lose weeks before being told the file is closed.

Where an inspector's conditions come from

Inspectors draw conditions from three places: the list the local planning authority puts forward, the list the appellant puts forward, and their own judgement on what the evidence requires. Where the parties agree a list, inspectors usually adopt it with edits. Where the parties do not engage, the inspector writes the conditions alone, from the officer report and the consultee responses.

Every condition is meant to satisfy the six tests in national policy and the Planning Practice Guidance on the use of planning conditions: necessary, relevant to planning, relevant to the development permitted, enforceable, precise, and reasonable in all other respects. A condition that fails one of those tests is still a condition. It binds you until it is varied, removed or quashed.

Pre-commencement conditions carry an extra step. Section 100ZA of the 1990 Act and the Town and Country Planning (Pre-commencement Conditions) Regulations 2018 require the applicant's written agreement before such a condition is imposed on a grant of permission, and inspectors raise the point with the parties when the draft list includes one. If you are asked and you say nothing, you have not protected yourself.

Why a condition can be unworkable in practice

Most problem conditions are not wrong in principle. They are wrong in sequence, scope or arithmetic.

A condition requiring a bat emergence survey before any works start is unarguable in policy terms and impossible to comply with in November, because the survey season runs roughly May to September with optimal months in May to August. A condition requiring the highway works to be complete before first occupation of any dwelling stalls a phased scheme where the works depend on a junction the authority has not yet adopted. A condition tying materials to a sample panel approved in writing is normal, but one requiring the panel on site before any work including site clearance blocks the ground investigation.

Then there are the drafting slips: a condition referring to a drawing number that was superseded, a condition repeating an obligation already in the section 106 agreement, a condition importing a standard that was withdrawn. Read the decision letter alongside the conditions, because the reasoning usually reveals what the inspector was trying to secure, and that is the thing you have to replicate in any alternative wording.

Section 73 to vary an appeal condition

Section 73 lets you apply for permission to develop without complying with a condition previously imposed. Three features of it decide your strategy.

First, the application goes to the local planning authority, not to the Inspectorate. The authority that resisted your scheme now decides whether the inspector's condition can be relaxed, and it will consult again.

Second, a section 73 grant is a new permission that sits alongside the original. The authority must consider all the conditions afresh, so the decision notice needs to re-impose everything you want to keep. Check the new notice line by line against the appeal decision.

Third, section 73 cannot be used to extend the time limit for implementation, and it cannot be used to change the description of development. If the condition you dislike defines the development itself, section 73 is the wrong tool and a fresh application is the honest answer.

Approval of details with the original authority

Many conditions do not need varying at all. They need discharging, and the difference is worth money.

An approval of details application submits the information the condition asks for and asks the authority to confirm compliance. The fee is set nationally, is charged per request rather than per condition, and is indexed annually from 1 April, so check the current fee schedule before budgeting. Bundle conditions into one request where the evidence overlaps, and keep drainage, ecology and highways separate where different consultees are involved, because one slow consultee holds up everything in the same request.

Where you think a condition has already been satisfied by material submitted at appeal, say so and ask for written confirmation. A short letter recording that the inspector's condition 7 is discharged by the appendix to your proof of evidence costs one fee and removes an enforcement risk at sale.

Costs, timescales and the value of getting it right first

A section 73 application runs to the standard eight week period for a minor application and 13 weeks for a major, with the same consultation. Add time for the authority to consult the parties who objected at appeal, because they will comment again. In practice a straightforward variation takes two to three months from submission, and longer where a committee is involved because cycles are monthly.

The cost profile is the application fee, the consultant time to prepare the justification, and any technical work the authority asks for to support the change. Those are modest against the delay cost of a site standing idle, which is the number that should drive the decision. Where the condition blocks work for a season, as ecology conditions often do, the variation is usually worth pursuing in parallel with the discharge applications rather than after them.

The refusal note from the original application is still useful reading at this stage, because the authority's concerns rarely change. The approach set out in reading a refusal notice and turning it into a plan applies equally to a condition you are trying to soften.

Preventing the problem during the appeal

Almost every unworkable condition could have been fixed for free before the decision was issued.

1. Submit a draft condition schedule with your statement of case, not just a note agreeing the authority's list.
2. For every condition, state the trigger you can actually live with: before first occupation, before the relevant phase, before above ground works, rather than before development begins.
3. Attach the survey calendar where seasonal work is involved, so the inspector can see that a pre-commencement ecology condition would idle the site for months.
4. Flag any condition that duplicates a section 106 obligation and ask for it to be deleted.
5. Where a highways condition is proposed, agree the wording with the highway authority directly and put the agreed text in front of the inspector, along the lines set out for highway safety refusals and the evidence that answers them.
6. Confirm in writing whether you agree to each pre-commencement condition.

Inspectors welcome this. A list with agreed triggers and clean cross-references is quicker for them to adopt than one they have to rewrite.

Illustrative example: an appeal allows 24 dwellings with a condition requiring a badger survey and a lighting scheme approved before development begins. The developer applies under section 73 to change the trigger to before above ground works, supported by the ecologist's letter confirming that site clearance can proceed under a watching brief. The authority grants the variation in ten weeks and re-imposes the remaining 19 conditions. Figures here are illustrative rather than drawn from a real case.

Where a variation needs a supporting statement, PlanScope drafts a Planning Statement structured to UK planning policy, with missing site facts flagged rather than filled in. Enter your postcode on PlanScope to see which documents a section 73 application is likely to need.

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.