Local plan site allocations and their weight
An allocation settles the principle and leaves capacity, access and infrastructure open. This sets out the weight at each plan stage, the requirements written into allocation policies and how departures are judged.
A site allocation settles the principle of development and almost nothing else. That is the gap that catches promoters out: the allocation gets you past the question of whether the land should be developed, and then every other question, access, capacity, layout, affordable housing, phasing and infrastructure, is still live. Site allocation weight in planning terms comes from the allocation being a development plan policy, and under section 38(6) of the Planning and Compulsory Purchase Act 2004 the application must be determined in accordance with the plan unless material considerations indicate otherwise.
Which is strong. It is not decisive, and it is not a permission.
What an allocation settles and what it leaves open
An adopted allocation establishes that the local planning authority has tested the site through examination, found it suitable in principle for the stated use, and counted it towards its requirement. An objection that the land should stay as a field is therefore running against the plan, and officers will say so.
What remains open is everything about the scheme. The indicative capacity in the allocation is a planning judgement made on limited information, often years earlier. Access arrangements may have been assumed rather than tested. Constraints identified in the site assessment work may have been noted as matters for the application to resolve.
Read the evidence base, not just the policy wording. The site assessment sheets, the sustainability appraisal, the transport modelling and the infrastructure delivery plan behind the allocation will tell you what the authority assumed, and an application that contradicts an assumption without addressing it invites an objection from the officer who wrote it.
Weight at each stage of plan preparation
Emerging allocations are the harder question, and national policy sets out three factors that determine how much weight an emerging plan carries: the stage the plan has reached, the extent of unresolved objections to the relevant policies, and the degree of consistency with the Framework.
| Stage | Practical weight of an allocation |
|---|---|
| Issues and options, call for sites | Effectively none |
| Draft plan out for consultation | Limited, and vulnerable to change |
| Submission version before examination | Moderate, depending on objections to that site |
| Examination hearings concluded, main modifications consulted on | Considerable where the site is unobjected |
| Adopted | Full weight as part of the development plan |
The middle rows are where arguments happen. A site that is allocated in a submission draft and attracts no objection carries meaningfully more weight than one at the same stage that three parties have objected to on landscape grounds. Read the inspector's post hearing letters closely, because a site the inspector has already indicated is sound is in a stronger position than the plan as a whole.
Note that weight cuts both ways. Where a plan proposes to release your site from the Green Belt, the release does not happen until adoption, and an application in the meantime is judged against the designation that still exists.
Requirements written into the allocation
Modern allocations are rarely a line on a map. They carry requirements, and those requirements are policy.
Typical content includes an indicative dwelling number or floorspace, the access point or points, a requirement for a masterplan or design code to be agreed, land to be reserved for a school or open space, a green buffer to a boundary, a phasing expectation tied to infrastructure, surface water or highway works to be delivered, and archaeological or ecological work to be carried out before layout is fixed.
Each of those is a test your application will be measured against. Where the allocation requires a green buffer of a stated depth and your layout provides less, expect the point to be raised at validation, not at committee. Where it requires a policy compliant proportion of affordable housing, an Affordable Housing Statement that engages with the allocation wording rather than the generic plan policy is the stronger document.
Departing from the allocation's parameters
Departure is normal and often acceptable. The question is whether the departure defeats the allocation's purpose.
Capacity is the most common. An allocation for "around 120 dwellings" is not a cap, and delivering 145 can be consistent with the plan where the layout, density policy and amenity standards support it. Delivering 260 is a different proposition, because the transport and infrastructure evidence behind the allocation was built on a different number.
Boundaries are the second. Allocations are drawn at plan scale and the line frequently sits in the wrong place relative to a hedge or a ditch. Minor adjustments are usually resolved by evidence. Adding a field is not a minor adjustment.
Use, third. An allocation for employment use does not support housing, and the sequential approach in the plan's employment land policy will normally have to be worked through first, with an evidence base to support the loss.
Where you do depart, say so openly in the Planning Statement and explain how the allocation's purpose is still met. Officers respond much better to an acknowledged departure with reasoning than to a document that pretends the parameters say something they do not.
When an allocation is undeliverable
Some allocations never come forward. Ownership is fragmented, the access cannot be assembled, the viability does not work with the obligations attached, or a constraint identified late makes the assumed capacity impossible.
That has two consequences worth understanding. For your own site, an undeliverable allocation elsewhere in the authority weakens the authority's housing land supply position, which can strengthen an application on an unallocated site. For the undeliverable site itself, the allocation remains policy until the plan is reviewed, so an application that cannot meet the allocation's requirements is in an awkward position: supported in principle, non compliant in detail.
The honest answer in that situation is usually to engage with the plan review rather than to fight the application through appeal. Plan reviews are slow, and that is a commercial judgement rather than a planning one.
Unallocated sites and the plan-led system
An unallocated site is not automatically unacceptable. It is judged against the plan's policies for the area, including any settlement boundary, and against national policy. Where the authority cannot demonstrate the required supply of deliverable housing sites, or where relevant policies are out of date, the balance tilts towards approval unless the adverse effects clearly outweigh the benefits.
That route is harder work, more expensive and less certain than an allocation. It also changes what the evidence base has to do: the constraints work has to be watertight because nobody has pre-tested the site, and the early sweep described in the note on checking a site for constraints before you make an offer matters more, not less.
Plan-making reform under the Levelling-up and Regeneration Act 2023, including National Development Management Policies, will change how plans and national policy divide the ground. Parts of that regime are not yet in force, so check the current position rather than assuming.
Using an allocation in a submission
Four things make an allocation work for you in an application.
- Quote the allocation reference and its full wording, then address each requirement in turn with a cross reference to the document that answers it.
- Set out where the scheme differs from the indicative parameters, with the reasoning and the evidence.
- Reconcile the scheme with the allocation's evidence base, especially the transport and infrastructure assumptions.
- Deal with the green and blue infrastructure requirements as design, not as a landscape appendix. The note on green corridors and connectivity policy in local plans explains what officers look for.
Do that and the allocation does real work in the officer's report, because the officer can lift your compliance table into it.
Enter your postcode on PlanScope to see which reports an allocated site is likely to need.
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
Does a site allocation guarantee planning permission?
No. An allocation establishes the principle of development and forms part of the development plan, so section 38(6) of the Planning and Compulsory Purchase Act 2004 requires the application to be determined in accordance with it unless material considerations indicate otherwise. Access, capacity, layout, affordable housing and infrastructure all remain to be resolved on the application.
How much weight does an emerging allocation carry?
It depends on the stage the plan has reached, the extent of unresolved objections to that policy, and how consistent the policy is with national policy. A site in a submitted plan with no objections carries considerably more weight than one at the same stage facing landscape objections. Inspector correspondence during examination repays close reading.
Can I build more units than the allocation's indicative number?
Often, yes. An indicative capacity is a judgement made on limited information, not a cap, and a modest increase supported by density, amenity and highway evidence can be consistent with the plan. A large increase is harder, because the transport and infrastructure evidence behind the allocation was prepared on a different figure.
What happens if my site is allocated in a plan that has not been adopted?
The existing development plan still governs the decision. If the current plan designates the land as Green Belt or places it outside a settlement boundary, those policies apply until the new plan is adopted. The emerging allocation is a material consideration whose weight depends on the plan's stage and the objections to it.
Is an unallocated site worth pursuing?
Sometimes. It is judged against the plan's policies for the area and national policy, and where the authority cannot demonstrate the required supply of deliverable housing sites the balance can tilt towards approval. It is a slower and less certain route, and the constraints evidence has to be stronger because nobody has pre-tested the site.
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.