Joint local plans: which policies apply to your application
A joint local plan does not merge the councils. The authority containing your red line still decides, and the development plan is usually the joint plan plus saved district policies plus any neighbourhood plan.
If your site sits in an area covered by a joint local plan, the plan is still the development plan for that site and section 38(6) applies exactly as normal. What changes is administration. The authority that determines your application is the one whose administrative area contains the land, even where the plan was written jointly, the officers are shared, and the committee sits in a different town hall. Get that right on the form and half the confusion disappears.
The other half comes from policy numbering, saved policies and validation lists that were never fully merged.
Why authorities plan jointly
Sections 28 and 29 of the Planning and Compulsory Purchase Act 2004 allow two or more local planning authorities to agree to prepare a joint local development document and to establish a joint committee to do it. Councils use those powers for practical reasons: a housing market area that ignores the boundary, a shared evidence base that would otherwise be paid for twice, a strategic site that straddles two districts, or simply the cost of running separate examinations.
The arrangements come in three shapes and they behave differently.
| Arrangement | What is shared | Who decides applications |
|---|---|---|
| Joint local plan | The plan document and its examination | Each authority, for land in its own area |
| Joint committee under section 29 | Plan preparation and, sometimes, adoption | Each authority, unless functions are formally delegated |
| Shared planning service | Officers, systems and often the portal | The authority for the site, through its own scheme of delegation |
A joint plan does not merge the authorities. Two councils each adopt the same document by their own resolution, on their own date, and those dates are occasionally weeks apart.
Which council actually decides
Work it out from the land, not from the letterhead.
- Identify the administrative area the red line sits in. Where a site straddles a boundary, each authority determines the part in its area, and you will normally submit duplicate applications with matching drawings.
- Pay the fee to that authority. Shared services often use one portal account, and fees routed to the wrong council are a common cause of an application sitting unvalidated.
- Address correspondence to the case officer, who may be employed by the partner authority under a shared service agreement. That is fine. The decision notice will still be issued in the name of the determining council.
- Check whether the determining authority has delegated anything to a joint committee. Delegation of development management functions between authorities is possible under section 101 of the Local Government Act 1972, and where it has happened the constitution will say so.
For a cross-boundary site, keep the two applications identical in substance and cross-reference them in each covering letter. Inspectors dislike finding that the drawings diverged.
Policy numbering and saved policies
This is where consultants lose time. A joint plan usually replaces some, but not all, of each authority's earlier policies. What survives is listed in an appendix, normally titled something like "policies superseded on adoption", and the residue are the saved policies.
So a site can be governed by three layers at once: the joint plan's strategic and development management policies, a handful of saved policies from the predecessor local plan for that district, and a made neighbourhood plan. All three are part of the development plan. A Planning Statement that quotes only the joint plan is incomplete, and officers notice when the saved policy on, say, rural workers' dwellings goes unaddressed.
Numbering compounds it. Joint plans often prefix policies by theme rather than by council, so DM12 in the joint plan and DM12 in an old district plan can both exist and mean different things. Quote the policy number, the plan name and the adoption year every time. "Policy DM12 (housing mix) of the adopted joint local plan, 2023" removes the ambiguity in nine words.
Where the joint plan is only partly adopted, because one authority resolved to adopt and another deferred, the position is awkward and worth a phone call to the policy team rather than a guess.
Shared services, separate validation lists
Two councils sharing a planning service will often still publish two local validation lists, because each list was adopted separately and updating both requires two consultations. The lists then drift.
Check which list applies to the determining authority, and check the date on it. Where the lists differ on a cross-boundary application, prepare to the stricter of the two, since you will be submitting to both anyway. Typical divergences are ecology checklists, parking statements, and whether a drainage strategy is required below the major threshold. Where surface water is in play, the council's strategic flood risk assessment will usually be a joint document even when the validation lists are not.
One more practical point. Shared services frequently share a consultee list too, so the same tree officer, ecologist or conservation officer advises both authorities. Their previous comments on a similar scheme in the partner district are visible on the public register and are a fair guide to what they will say about yours.
Committees and delegation
Scheme of delegation is a local matter and it does not merge with the plan. Two councils in a shared service can have very different thresholds for referring an application to committee: one might refer on three objections, the other on ten, and one might have a members' call-in period that the other does not.
Read the determining authority's constitution, not the partner's. If you are managing a portfolio across both, keep a one-page note of the two delegation thresholds, because the difference changes your programme by four to six weeks on a marginal case.
Where a site is strategic and cross-boundary, some joint arrangements create a joint planning committee for defined categories of application. That is a formal delegation and it will be documented. Do not assume it from the existence of a joint plan.
Citing the right plan in your statement
Set out the development plan in full at the start of the policy section, in this order.
- The joint local plan, with its adoption date and the adopting authority relevant to your site.
- Saved policies from the predecessor plan for that district, named individually.
- Any made neighbourhood plan, with the date it was made.
- Any minerals and waste local plan, which in two-tier areas is prepared by the county council and is part of the development plan even though it is rarely mentioned.
Then note the current National Planning Policy Framework edition you are relying on. The Framework was renumbered in December 2024 and re-issued on 17 August 2026 with policy-coded chapters, so a statement that cites paragraph numbers from an older edition invites a correction in the officer's report.
Where a scheme triggers obligations, the heads of terms are negotiated with the determining authority even if a partner council will receive contributions for facilities in its area. Our note on section 106 heads of terms on a nine-unit scheme covers how those are usually structured.
Get the plan hierarchy right on page one and the rest of the statement reads as though someone who knows the area wrote it. Enter your postcode on PlanScope to see which reports a site is likely to need. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval, and this is general guidance rather than legal advice.
Frequently asked questions
Which council determines an application where a joint local plan applies?
The local planning authority whose administrative area contains the land. Joint plan-making under sections 28 and 29 of the Planning and Compulsory Purchase Act 2004 covers plan preparation, not development management. Officers may be shared, but the decision notice is issued by the authority for the site and the fee must be paid to that authority.
What happens if my site straddles a district boundary?
Each authority determines the part of the scheme in its own area, so you normally submit duplicate applications with identical drawings and pay two fees. Cross-reference the two applications in each covering letter and keep the submitted documents in step, because divergence between the two sets causes problems at appeal.
Do old district policies still apply after a joint plan is adopted?
Often yes. Joint plans usually supersede some earlier policies and save others, with the list set out in an appendix to the adopted plan. Those saved policies remain part of the development plan for that district alone, so a policy section that quotes only the joint plan will be incomplete.
Why do two councils sharing a planning service have different validation lists?
Because each list is adopted separately after its own consultation, and updating both takes two processes. The lists drift over time on items such as ecology checklists and drainage statements. Use the list published by the determining authority, check its date, and prepare to the stricter list on cross-boundary schemes.
Is there a joint planning committee for joint plan areas?
Not automatically. A joint plan does not create a joint development management committee. Some arrangements do delegate defined categories of application to a joint committee under section 101 of the Local Government Act 1972, and where that has happened the determining authority's constitution will record it. Check the constitution rather than assuming.
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.