Appeal submissions and the evidence an inspector expects
An appeal re-determines the application you submitted. The document set exists to answer the refusal reasons and refresh expired survey data, nothing more.
An appeal is a re-determination of the application you submitted, not a chance to submit a better one. That single point governs the whole planning appeal evidence question: the inspector is deciding the same proposal the council refused, on the same red line, so the document set exists to answer the stated reasons for refusal and to bring expired technical data back up to date. Anything else is cost without benefit.
Work backwards from the decision notice. Each reason for refusal is a proposition the council has to defend, and each one needs either a report that disproves it or an argument that it does not matter in the planning balance. Reasons you cannot answer are the ones to think hard about before you lodge.
What you can and cannot introduce
The proposal itself is fixed. Amending the scheme at appeal is possible only within narrow limits, because an inspector cannot determine something materially different from what the council considered and the public was consulted on. Minor amendments that reduce the impact and prejudice nobody may be accepted, but a reduced massing, a moved access or a changed unit mix usually means a fresh application rather than an appeal.
New evidence is a different question. You can submit reports that were never before the council, and in some cases you have to. The risks are two: the council may say it would have reached a different view had it seen the material, which invites a request to remit or an application for costs, and the inspector may give limited weight to evidence the authority has had no proper chance to consider.
The safe pattern is to serve any substantial new technical report with the appeal itself, and to flag it in the statement of case so that the council's own statement can respond. Holding a report back for the inquiry is an invitation to a costs application.
Reports that answer refusal reasons directly
Match the document to the words on the notice. A refusal on highway safety grounds needs a transport case, not a general sustainability narrative. Some common pairings:
| Reason for refusal | Evidence that answers it |
|---|---|
| Loss of neighbour amenity | Daylight and sunlight study, sections showing the 45-degree relationship, overshadowing analysis |
| Highway safety or capacity | Visibility splay drawings, accident data, trip generation, a Transport Statement or Transport Assessment |
| Flood risk or drainage | Updated Flood Risk Assessment, sequential test, drainage calculations |
| Harm to a designated heritage asset | Significance and harm assessment, setting analysis, public benefits case |
| Design and character | Contextual analysis, street elevations, materials schedule, a precedent study of the local pattern |
| Ecology | Updated survey, mitigation strategy, biodiversity metric output |
Keep the Planning Statement as the spine. It should take each refusal reason in turn, state the policy it cites, and say where in the appeal bundle the answer sits. Inspectors read a lot of paper, and a document that tells them where to look is worth more than a longer one that does not.
Evidence that has gone out of date
Refusal to decision letter can easily run past a year, and several categories of survey data decay in that time.
Ecology is the sharpest case. Survey data has a working shelf life, and the professional guidance expects results more than a couple of seasons old to be reviewed and, where the site or the surrounding habitat has changed, repeated. If the refusal happened in October and the appeal is heard the following summer, a bat emergence survey window will have opened and closed in between, which can be awkward where the appeal turns on a roost. Articles on the documents needed for a dwelling containing a known bat roost set out the sequencing issue in more detail.
Flood risk evidence ages for a different reason. The climate change allowances and the published flood mapping are revised periodically, so an assessment prepared against a superseded allowance will be challenged. Check the current allowance before you rely on the original Flood Risk Assessment.
Transport counts, parking surveys and trip rates are also time-sensitive, and a survey carried out in a school holiday or in an abnormal travel period will be attacked whatever its conclusions.
Statements of common ground and technical agreement
For inquiries, and often for hearings, a statement of common ground is the most efficient document in the bundle. It records the facts both sides accept: site area, floorspace, the development plan policies that apply, the heritage designations, the flood zone, the agreed trip rates, the distance to the nearest bus stop.
Agree the arithmetic even where you disagree about what it means. If the parties can agree the biodiversity baseline figure while disputing whether the off-site solution is acceptable, the inquiry spends its time on the dispute rather than on the spreadsheet. Topic-specific statements on noise, drainage or daylight work the same way, and are usually prepared between the respective experts rather than by the advocates.
Keep policy interpretation out of it. A statement of common ground that strays into the planning balance tends to unravel under cross-examination.
Third party evidence
Interested party representations go in alongside the main cases, and an inspector must consider them. They are frequently where the material point actually appears: a neighbour who has lived with the surface water for 20 years, a parish council with the local history of a right of way, a residents' group with photographs from the relevant season.
Respond on the planning merits and in writing, through the final comments stage. Correct factual errors politely and specifically. Do not respond to the tone, and do not ignore a technical objection on the basis that it came from a layperson, because inspectors have a habit of adopting well-evidenced local points in decision letters.
Proportionality by procedure
The procedure sets the paperwork.
- Householder and minor commercial appeals run on an expedited written procedure. The appeal form, the original application documents and the council's case are all the inspector sees, with no further submissions, so everything you want considered must go in at the start.
- Written representations for other appeals allow a statement of case and final comments. This suits appeals turning on policy interpretation or on a single technical issue with agreed facts.
- Hearings suit appeals where the inspector needs to ask questions of several parties, with statements of case but no cross-examination.
- Inquiries involve proofs of evidence, appendices, a statement of common ground, cross-examination and usually counsel. Reserve them for appeals with contested expert evidence or substantial scale.
Appeal deadlines differ by type. Most section 78 appeals must be lodged within six months of the decision notice, while householder and some minor commercial appeals have 12 weeks, and a late appeal will not be accepted.
The document set to submit
For a typical minor or major appeal on written representations or at a hearing, expect to lodge:
- the completed appeal form and the full original application pack as submitted
- the decision notice, officer report and committee minutes
- your statement of case, structured by refusal reason
- updated technical reports where data has expired, with a short note explaining what changed
- any new technical report answering a refusal reason, served at the outset
- a plans schedule listing every drawing by number and revision
- the draft conditions you would accept, and a signed or draft section 106 where obligations are in play
- a statement of common ground where the procedure allows it
Over-submission has a cost. Twenty reports that nobody asked for dilute the three that matter, and an authority's statement will happily point out that the appellant has produced a great deal of material on matters that were never in dispute. Browse the 66 report types by category if you are scoping which technical documents the refusal reasons require, then build the bundle around those.
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 change the scheme when I appeal a refusal?
Only within narrow limits. An inspector determines the proposal the council considered and the public was consulted on, so minor amendments that reduce impact and prejudice nobody may be accepted. A changed access, reduced massing or different unit mix normally requires a fresh application instead, because the amended scheme was never consulted on.
Will new reports at appeal lead to a costs award against me?
They can, if the council says it would have decided differently with the material and has been put to wasted expense. The protection is timing: serve substantial new technical evidence with the appeal and identify it in your statement of case, so the authority can respond in its own statement rather than at the hearing.
How long do I have to lodge a planning appeal?
Most section 78 appeals must be submitted within six months of the date on the decision notice. Householder appeals and some minor commercial appeals run on a shorter 12-week limit with an expedited written procedure. Late appeals are not accepted, so check which category applies as soon as the notice arrives.
Do ecology surveys need repeating before an appeal?
Often yes. Professional guidance treats survey data as having a working shelf life, and results more than a couple of seasons old should be reviewed and repeated where habitat or site conditions have changed. Seasonal windows matter too, since an emergence survey missed in one summer cannot be caught up until the next.
What should go in a statement of common ground?
Facts both parties accept: site area, floorspace, applicable development plan policies, designations, flood zone, agreed trip rates and survey outputs. Agree the arithmetic even where you dispute its meaning. Keep policy interpretation and the planning balance out of it, because those are the matters the inspector is there to decide.
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.