Grampian condition appeals and the reasonable prospects test
A negatively worded condition requiring off-site works is lawful even where delivery looks unlikely, but guidance still asks for reasonable prospects. Here is the evidence that decides those appeals.
A Grampian condition appeal usually turns on a mismatch that catches out even experienced agents: a negatively worded condition requiring off-site works can be lawful even where delivery looks unlikely, but national guidance still tells councils not to impose one unless there are at least reasonable prospects of the works being carried out within the life of the permission. Lawfulness and policy pull in different directions. An inspector deciding a section 78 appeal has to apply both.
So the argument is rarely about whether such a condition is permitted in principle. It is about evidence.
What a Grampian condition does
The device takes its name from Grampian Regional Council v City of Aberdeen District Council (1984), where the courts accepted that a condition could prohibit development until works were carried out on land outside the application site. The condition is negative in form. It does not require the applicant to do anything. It simply says no development, or no occupation, until a defined event has happened.
That structure matters because a condition requiring a developer to carry out works on land they do not control would fail the enforceability test. A condition that withholds the benefit of the permission until the works exist is enforceable against the developer, because the sanction is that the permission cannot be used.
Typical uses are a highway improvement under a section 278 agreement, a sewer connection across neighbouring land, a visibility splay needing third party hedge removal, or an off-site drainage outfall. All of them share the same feature: the mitigation the council needs is not inside the red line.
The no reasonable prospect objection
The lawfulness point was settled by the House of Lords in British Railways Board v Secretary of State for the Environment (1993). A negatively worded condition is not unlawful merely because there appears to be no reasonable prospect of the specified action being performed within the time limit of the permission. The earlier, stricter approach was displaced.
National guidance did not follow the courts all the way. The Planning Practice Guidance on the use of planning conditions advises that conditions requiring works on land outside the applicant's control should only be used where there are at least reasonable prospects of the action being performed within the time limit. It is policy, not law, so an inspector can depart from it with reasons, but in practice it sets the test an appellant has to meet.
The result on appeal is that councils argue delivery is speculative and the permission would therefore be meaningless, while appellants argue the condition harms nobody even if the works never happen. Inspectors tend to look at whether the condition is doing real planning work or papering over an unresolved objection.
Evidence that the works are deliverable
What moves an inspector is correspondence, not assertion. The strongest appeal statements carry a short, dated evidence trail.
- A letter from the local highway authority confirming the design is acceptable in principle and that it would enter a section 278 agreement.
- Heads of terms, a draft agreement or a solicitor's letter confirming instructions on the off-site land.
- An option, a licence or a deed of easement already signed, even if conditional.
- For utility works, a formal connection offer or a design acceptance from the sewerage undertaker.
- A programme showing the off-site works completing inside the three-year implementation period.
Where the off-site land belongs to the council itself, say so plainly. A council objecting that delivery is doubtful while owning the land needed is in an awkward position, and inspectors have noticed that tension before. Reviewing earlier appeal decisions on comparable conditions costs less in time than calibrating the argument by guesswork.
Third party land and what it changes
Ownership drives both the procedure and the weight. Certificate B or C under article 13 of the Development Management Procedure Order 2015 must be served on the owner of any land forming part of the application site, and off-site works brought inside the red line make those owners parties to the application.
Many applicants deliberately keep the off-site works outside the red line so that the application only needs a certificate A. That is legitimate where the works sit outside the red line and dealt with by condition, but it also weakens the deliverability argument, because the council can point out that nothing in the application binds the landowner.
There is a middle route that appeal inspectors respond well to. Include the off-site works area within the application site, serve notice on the owner, and let the condition deal with timing rather than consent. The owner's silence or support then becomes part of the evidence base.
Alternatives worth considering before you appeal
A Grampian condition is not the only mechanism, and sometimes the better appeal case is that a different instrument should have been used.
| Mechanism | When it fits better |
|---|---|
| Section 106 obligation | Payment or works tied to a trigger, where the land is in the applicant's or a willing party's control |
| Section 278 agreement, Highways Act 1980 | Works to an existing public highway, delivered and adopted by the highway authority |
| Section 38 agreement | New roads to be offered for adoption |
| Option or easement | Private third party land, where certainty before determination is achievable |
| Redesign | Where the off-site element can be brought inside the site, even at a cost to yield |
Redesign is underrated. A visibility splay that needs a neighbour's hedge cut back is a planning problem for the life of the permission. A splay achieved by moving the access four metres is a drawing revision.
Where an inspector will refuse to impose one
Three situations recur.
The first is where the condition is really a substitute for resolving a substantive objection. If the highway authority says the junction cannot be made safe, a condition requiring an unspecified improvement is not mitigation and fails the necessity and precision tests.
The second is where the works depend on a consent that has already been refused. If the third party has written to say they will not grant access, the prospects are not merely uncertain. A condition in those circumstances creates a permission that cannot be used, and inspectors are reluctant to grant something illusory.
The third is imprecision. A condition requiring "such off-site works as the local planning authority may require" is unenforceable and would be struck out on appeal even where everyone agrees works are needed.
One honest uncertainty: inspectors differ on how much weight to give a council's own refusal to engage on a section 278 agreement. Some treat it as evidence that delivery is doubtful, others as a matter the council should not be able to rely on. Where that is the pivot of your appeal, say so expressly in the statement of case rather than leaving it implied.
Drafting that survives scrutiny
If you are proposing the condition yourself, draft it and offer it. Appellants who leave the wording to the council lose control of the test they will later be judged against.
- Use negative wording, beginning with "No development shall take place until" or "No dwelling shall be occupied until".
- Identify the works by reference to a numbered drawing, not a description.
- State the standard or specification, for example a visibility splay of a stated dimension measured from a stated point.
- Fix the trigger to the latest point that still delivers the planning purpose, so occupation rather than the start of works where the harm only arises on occupation.
- Avoid any clause that requires the applicant to obtain a third party's agreement, because that is the obligation the device exists to avoid.
Remember the agreement requirement for pre-commencement conditions. Under section 100ZA of the Town and Country Planning Act 1990 and the 2018 regulations made under it, a council cannot impose a pre-commencement condition without the applicant's written agreement, subject to the prescribed procedure. A Grampian condition triggered at occupation rather than at the start of works sidesteps that process entirely, which is a reason to prefer it where the planning purpose allows.
Where the refusal was a committee decision taken against officer advice, the condition argument often sits alongside a wider case about weight, and the prospects on that kind of appeal are worth assessing together rather than separately. The supporting Planning Statement should carry the condition schedule you want, with the deliverability evidence appended, and where the off-site element is a junction or access improvement a Transport Assessment is the document that has to make the design stand up.
Draft your appeal supporting statements on PlanScope and send them for professional review before they go to the Planning Inspectorate.
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
What is a Grampian condition?
A negatively worded planning condition that prevents development or occupation until works are carried out on land outside the application site. It takes its name from Grampian Regional Council v City of Aberdeen District Council (1984). Because it withholds the benefit of the permission rather than requiring the applicant to act on land they do not control, it remains enforceable.
Can a council refuse permission because off-site works are not secured?
It can, but a refusal on that basis is vulnerable if a condition would resolve the issue. The question on appeal is whether a negatively worded condition meets the six tests in national guidance and whether there are reasonable prospects of the works happening within the life of the permission. Evidence of deliverability is what decides it.
Is a Grampian condition unlawful if the works may never happen?
No. The House of Lords held in British Railways Board v Secretary of State for the Environment (1993) that such a condition is not unlawful merely because there appears to be no reasonable prospect of the works being performed in time. National guidance is stricter than the law, so the policy test still has to be addressed.
Does the agreement rule for pre-commencement conditions apply?
Yes, where the condition bites before development starts. Section 100ZA of the Town and Country Planning Act 1990 and the 2018 regulations require the applicant's written agreement to a pre-commencement condition, following a prescribed procedure. Triggering the condition at occupation instead of commencement avoids that process where the planning purpose allows.
Should off-site works be inside the red line?
Including them means serving notice on the affected owner under article 13 of the Development Management Procedure Order 2015, which some applicants avoid. It does strengthen a deliverability case, because the owner becomes a party to the application and their position goes on the record rather than being left to inference.
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.