Enforcement grounds (b) and (c) and the difference
Ground (b) of an enforcement appeal is a denial of the facts. Ground (c) concedes them and argues there is no breach. The evidence each needs is entirely different.
Ground (b) says the matters alleged in the enforcement notice have not occurred. Ground (c) says they have occurred but do not constitute a breach of planning control. Both appear in section 174(2) of the Town and Country Planning Act 1990, both are decided on the facts and the law rather than on planning merits, and pleading the wrong one is the commonest drafting error in enforcement appeals.
The practical distinction is simple once stated. Ground (b) is a denial. Ground (c) is a concession plus a legal argument.
What each ground asserts
Section 174(2) sets out seven grounds, lettered (a) to (g). The two in question read, in substance, that the matters stated in the notice have not occurred, and that those matters, if they occurred, do not constitute a breach of planning control.
Ground (b) attacks the allegation itself. The notice says a two storey rear extension was erected; you say no extension was erected, or that what was erected is not what the notice describes. The burden here falls on the appellant on the balance of probabilities, which matters because a failed ground (b) leaves the allegation proved.
Ground (c) accepts the facts and denies the legal characterisation. Yes, the building was erected, and it was permitted development under the General Permitted Development Order. Yes, the use changed, and it moved within the same use class so no development occurred. Yes, the works happened, and they were not development at all within the meaning of section 55 because they did not materially affect the external appearance.
An inspector deciding either ground is not weighing whether the development is acceptable. That is ground (a), the deemed application, and it carries a fee.
Factual disputes against legal disputes
Sort the issue before drafting. Ask what the notice alleges, in its exact words, and then ask whether you disagree with the facts or with the conclusion drawn from them.
| Question | Ground (b) | Ground (c) |
|---|---|---|
| What is disputed | Whether the matters happened as described | Whether the matters amount to a breach |
| Typical evidence | Dated photographs, invoices, witness statements, survey measurements | Measured drawings against the GPDO limits, use class analysis, lawful use history |
| Who bears the burden | The appellant, on the balance of probabilities | The appellant, on the balance of probabilities |
| Common outcome if it fails | Allegation proved as drafted | Breach established, so compliance required |
Measurement cases straddle the two, and that is where the error usually arises. A notice alleging an extension projecting 5 m from the original rear wall, where the true projection is 3.8 m, is a ground (b) point about the allegation and often a ground (c) point as well, because at 3.8 m the extension may fall within the permitted limits.
Evidence for a ground (b) case
The evidence has to be capable of proving a negative or correcting a description, which is harder than it sounds.
- A measured survey by a surveyor, with the datum and the reference points identified, rather than a tape measurement by the owner.
- Dated photography, ideally with metadata intact, showing the state of the land before and after the period the notice covers.
- Invoices, delivery notes and contractor records that establish what was built and when.
- Aerial imagery or historical mapping to fix the position of the original rear wall, which is the reference point the GPDO uses and not the current rear wall.
- Witness statements from people with direct knowledge, signed and dated.
What does not work is assertion. An appeal statement saying the extension is smaller than alleged, without a drawing, will fail. And where the notice describes the breach loosely, a ground (b) argument that the description is imprecise is better run as a challenge to the notice's validity or as a request that the inspector correct the notice under section 176(1), which can be done where no injustice results.
Evidence for a ground (c) case
Ground (c) turns on documents and on law, so the evidence is different in kind.
For a permitted development argument, produce the measured drawings and compare them line by line with the relevant class and its limitations. Schedule 2 Part 1 Class A for house extensions has conditions on projection, height, eaves, materials, side elevations and curtilage coverage, and failing any one of them removes the right. Check whether an Article 4 direction removes the class in that area, whether the property is a flat rather than a house, and whether earlier extensions have used up the allowance, since the limits bite cumulatively against the original dwellinghouse.
For a use class argument, establish the lawful use first. A move within Class E is not development. A move from Class E to a sui generis use such as a hot food takeaway is. For a material change of use argument, the question is one of fact and degree about the character of the use, not about the occupier's description of it.
For a section 55 argument, the point is usually that the works are internal, or affect only the interior, or do not materially affect the external appearance of the building. Painting, internal alterations to an unlisted building, and like for like repairs all fall here.
Keep a Planning Statement style structure for this analysis: the facts, the applicable provision, the comparison, the conclusion. Inspectors read a great many loosely organised enforcement statements.
Running both grounds together
You can plead (b) and (c) together, and in measurement cases you usually should. The order matters in the drafting: set out the factual position first, then argue that on those facts there is no breach.
Where it becomes awkward is when the two arguments are inconsistent. Asserting that no extension was built and in the alternative that the extension built was permitted development reads badly and invites the inspector to treat the primary case as weak. If the facts are uncertain, say which account you contend for and why, then put the legal argument in the alternative in clear terms.
Note that ground (c) and ground (d) are different arguments about different things. Ground (d) concerns immunity through the passage of time, which accepts both the facts and the breach and relies on enforcement being out of time. Running (c) and (d) together is common and entirely consistent.
Where pleading the wrong ground costs you
Three costs follow from getting this wrong.
The first is evidential. A ground (c) case needs drawings and legal analysis, and a ground (b) case needs factual proof. Prepare the wrong one and you arrive with the wrong material and no time to fix it, because enforcement appeals run to a timetable set when the appeal is accepted.
The second is costs. Pursuing a ground with no evidential foundation, or raising a factual dispute that the appellant's own documents disprove, can attract an award of costs for unreasonable behaviour.
The third is the loss of the useful outcome. If what you actually want is permission for what has been built, ground (a) is the route, and it carries a deemed application and a fee. An appellant who runs (b) and (c) alone and loses has no permission and a notice to comply with. Reading the notice carefully before deciding is the same discipline as reading a refusal notice and turning it into a plan.
Drafting the grounds of appeal
Write each ground as a separate numbered section, and within each one follow the same order.
- Quote the allegation in the notice exactly as drafted.
- State the ground relied on and what it asserts in one sentence.
- Set out the facts you contend for, with a reference to the evidence that proves each one.
- For ground (c), identify the statutory provision or class relied on and compare it against those facts.
- State the relief sought: that the notice be quashed, or corrected and upheld with variation.
- Deal with the alternative grounds separately rather than in the same narrative.
Serve the full statement with the appeal rather than holding material back. Late evidence in enforcement appeals is frequently refused, and there is no advantage in surprise. Where the amenity merits also matter, the evidence that answers them is set out in neighbour amenity refusals and the overlooking and overbearing arguments.
This is general guidance, not legal advice; check the position with your local planning authority or a qualified professional before relying on it. A lawful development certificate is the only formal way to confirm that works or a use are lawful. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval. Enter your postcode on PlanScope to see which reports your site is likely to need.
Frequently asked questions
What is the difference between ground (b) and ground (c)?
Ground (b) asserts that the matters stated in the enforcement notice have not occurred, so it disputes the facts. Ground (c) accepts that they occurred but argues they do not constitute a breach of planning control, usually because the works were permitted development, the use change was within a class, or there was no development within the meaning of section 55.
Who has the burden of proof on grounds (b) and (c)?
The appellant, on the balance of probabilities. That has a practical consequence: a ground (b) case that rests on assertion rather than measured drawings, dated photographs or contractor records will usually fail, and a failed ground (b) leaves the allegation proved as the notice drafted it. Prepare the evidence before lodging the appeal.
Can I plead both grounds in the same appeal?
Yes, and in measurement cases you often should, setting out the factual position first and then arguing that on those facts there is no breach. Take care where the two readings are inconsistent, because arguing that nothing was built and in the alternative that what was built was permitted development weakens the primary case.
Does ground (c) get me planning permission?
No. Grounds (b) and (c) can only quash or correct the notice. If what you want is permission for what has been built, that is ground (a), which carries a deemed planning application and a fee. An appellant who runs (b) and (c) alone and loses is left with no permission and a notice to comply with.
How is ground (c) different from ground (d)?
Ground (c) argues there is no breach at all. Ground (d) accepts the breach but argues enforcement is out of time because the relevant immunity period has passed. They rest on different evidence, a legal analysis against a chronology of occupation or use, and they can be run together without inconsistency.
Can an inspector correct a badly drafted notice?
Yes. Section 176 allows the notice to be corrected or varied where that can be done without injustice to the appellant or the authority. So a loosely worded allegation does not automatically defeat the notice, and an appeal built solely on imprecision in the drafting is a weak one unless the imprecision causes real prejudice.
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.