Validation pack for a site straddling two authority areas
Where a development site crosses a local authority boundary, each council can only determine the part within its own area. That means two applications, two validation lists and one evidence base that has to satisfy both.
A local planning authority can only grant permission for development on land inside its own area. So when a site straddles a boundary, the answer is two applications, each describing the whole development, each determined by one authority in respect of the land it controls. There is no single joint consent to apply for, and no mechanism that lets one council decide the whole thing on the other's behalf.
That shapes everything downstream. Two validation lists, two fee conversations, two consultation programmes, two committee cycles and two sets of conditions that have to be capable of operating together. The evidence base can be shared. The procedure cannot.
How a cross boundary proposal is actually submitted
Submit matching applications to both authorities on the same day. Each one carries the same red line around the whole site, the same drawings and the same supporting documents. What differs is the covering material: each application should state plainly that the site crosses into the neighbouring authority, name that authority, give the reference of the parallel application once you have it, and identify on a plan the area falling within each jurisdiction.
The description of development should be identical word for word in both. If one says "erection of 84 dwellings" and the other says "residential development of up to 84 dwellings with associated access", you have given two authorities licence to grant two different things.
The fee position needs settling before you submit rather than after. The fee regulations deal with applications for development on land crossing an authority boundary, and the figures are indexed annually, so confirm the calculation with both authorities in writing and check the current schedule rather than working from a figure quoted in an older appeal or report.
Where the scheme may be EIA development, request a screening opinion from both authorities together and ask them to coordinate. Two screening opinions that disagree is the worst outcome available, because the one requiring an Environmental Statement effectively governs. Scoping, if it follows, should be a single exercise producing one Environmental Impact Assessment scope.
Reconciling two validation checklists
The national information requirements are the same everywhere. Local lists are not, and this is where cross boundary packs come apart. Each authority publishes its own local validation checklist, reviewed at intervals, and the differences are usually in the technical reports: one may require a drainage strategy for any site over a threshold, the other only in critical drainage areas, one may want an energy statement for all major development, the other only above a floorspace trigger.
Build the pack to the union of the two lists, not the intersection. It costs far less to supply a document one authority did not ask for than to be held invalid for eight weeks while a survey season closes.
A short mapping table in the covering letter helps both validation officers and costs an hour:
| Document | Authority A local list | Authority B local list | Supplied |
|---|---|---|---|
| Planning Statement | Required, major | Required, major | Yes |
| Transport Assessment | Over 50 dwellings | Over 2,500 m2 floorspace | Yes |
| Drainage strategy | All major | Critical drainage area only | Yes |
| Energy statement | All major | Over threshold | Yes |
Two details catch people out. Site notices and ownership certificates are served and signed per application, so certificate dates and the agricultural holdings notice have to be right in both. And where one authority is a two tier district, county matters such as minerals, waste and highways sit with the county council, which changes who you are actually negotiating with.
The Planning Statement is the document that does the reconciling. It has to run the policy case against two development plans, because section 38(6) of the Planning and Compulsory Purchase Act 2004 binds each authority to its own plan. Where the two plans pull in different directions on density, parking standards or affordable housing percentage, say so, and set out why the scheme is acceptable under each.
Which authority leads on what
Nothing in statute makes one authority the lead. In practice, lead follows land: the authority containing the larger part of the site, or the part carrying the access and the majority of built form, usually takes the running on design and highways, while the other focuses on its own impacts.
Agree this openly at pre-application. A joint pre-application meeting with both case officers in the room is worth paying twice for, and both authorities publish pre-application fee bands on their websites. Ask for one note of the meeting, circulated to both, so there is a shared record.
Statutory consultees generally do not care about the boundary. The Environment Agency, Natural England, the lead local flood authority and the highway authority will respond to whichever application they are consulted on, and will usually say the same thing twice. Where a consultee responds to only one application, forward the response to the other authority yourself rather than assuming it has travelled.
Where both councils are determining the same proposal, the risk of one approving and one refusing is real, and it is the main reason to keep the two applications procedurally identical. The related problem of duplicate and overlapping applications on the same site is worth understanding before you add a third application into the mix.
Consultation, committee timing and the drift problem
Publicity periods run for 21 days from the later of the site notice or press notice in each authority, which means two start dates and two end dates. Determination periods run separately too: eight weeks for minor development, 13 weeks for major, 16 weeks for EIA development, each measured from the valid date in that authority.
Committee cycles are the real source of drift. If one authority has a four week cycle and the other a five week cycle, and one scheme goes to committee while the other is delegated, the two decisions can land months apart. Ask both authorities early whether the application will be delegated or referred, and whether a joint member briefing is possible.
An extension of time agreed with one authority should be matched with the other. Letting one determine while the second is still consulting invites a refusal that then has to be argued against a live permission next door.
Conditions, obligations and the levy
Conditions have to be capable of working together. The ones that cause trouble are the cross boundary ones: a construction management plan covering a compound that sits in one area and an access in the other, landscape management across the whole site, phasing tied to infrastructure delivered on the far side of the line.
Draft the conditions yourself and offer the same wording to both authorities. Where a condition can only be discharged by one authority because the relevant land is in its area, say so in the condition itself.
Section 106 obligations usually need both councils as parties to a single agreement, because each has to be able to enforce against the land in its area. County councils join as parties for education and highways contributions in two tier areas. Start the heads of terms early and expect two sets of legal comments.
The Community Infrastructure Levy is charged by each charging authority on the chargeable floorspace in its own area, at its own rates. Two charging schedules, two liability notices, two sets of relief forms. Self build and social housing relief are claimed from each authority separately, and both have to be in place before work starts on site.
Keeping the two in step
- Confirm the boundary from the authoritative source rather than an aerial photograph, and plot it on the location plan.
- Hold one joint pre-application meeting and get a single written note.
- Request screening, and if needed scoping, from both authorities together.
- Build the document pack to the union of both local validation lists.
- Submit on the same day and give each authority the other's reference as soon as it is issued.
- Match any extension of time, and ask for the committee dates in writing.
- Draft conditions and heads of terms once, and offer the same wording to both.
PlanScope can draft the supporting statements for both applications from one set of site answers, and the full list of document types is at all 66 report types. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval. For specialist technical reports, qualified professional input may be required.
This is general guidance, not legal advice; check the position with your local planning authority or a qualified professional before relying on it.
Frequently asked questions
Can one council determine the whole application if most of the site is in its area?
No. A local planning authority may only grant permission for development on land within its own area, so the part of the site in the neighbouring authority needs its own permission. The practical answer is two matching applications determined in parallel, each describing the whole development and each covering the land that authority controls.
Do I pay the planning fee twice?
Not normally. The fee regulations contain provision for development on land crossing an authority boundary, and the amounts are indexed annually. Confirm the calculation in writing with both authorities before you submit, and check the current published fee schedule rather than relying on a figure quoted in an older report or appeal decision.
What happens if one authority approves and the other refuses?
You hold a permission that cannot be implemented across the whole site, and the refusal can be appealed to the Planning Inspectorate in the usual way. Keeping both applications procedurally identical, agreeing matched extensions of time and asking for the committee dates early are the main ways to reduce the risk of split decisions.
Which validation checklist applies?
Both. Each authority validates against the national information requirements plus its own published local list, so the pack has to satisfy the union of the two. Supplying a document one authority did not request costs far less than an invalidation that pushes the scheme past a survey season or a committee cycle.
How is the Community Infrastructure Levy handled across a boundary?
Each charging authority charges on the chargeable floorspace within its own area at its own adopted rates, so expect two liability notices and two sets of relief or exemption claims. Any relief has to be claimed and granted before development starts in each area. Check both adopted charging schedules at the start of the appraisal.
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.