Justifying the loss of a designated employment site
Marketing evidence is the price of entry, and most of it fails on price rather than duration. The stronger case usually comes from obsolescence and from the council's own supply figures.
Releasing an allocated or designated employment site to another use turns on three bodies of evidence: marketing that shows no reasonable prospect of continued employment use at a realistic price, an analysis of why the buildings no longer work for the market they were built for, and figures showing that the local supply of employment land can absorb the loss. Councils ask for the first, weigh the second, and are most persuaded by the third when it comes from their own evidence base.
The usual mistake is to treat this as a marketing exercise alone. A twenty four month campaign proves very little if the quoting rate was 30 per cent above the market and the agent had no industrial desk.
How allocations and designations restrict change
The development plan is the starting point for any decision, and an allocation or a designation as a protected employment area carries real weight. Local policies typically resist the loss of employment floorspace unless the applicant demonstrates that continued employment use is not viable or that the site is surplus.
National policy pulls in a different direction on stale allocations. It discourages the long term protection of sites allocated for employment use where there is no reasonable prospect of them being used for that purpose, and asks that applications for alternative uses be considered on their merits having regard to market signals and relative need.
So the argument is rarely about whether the policy applies. It is about whether the site meets the exception the policy contains, and about how much weight the allocation deserves given its age and the evidence behind it. Check when the plan was adopted and what the evidence base said about this particular site.
The marketing evidence councils expect
Councils look for a campaign that a competent owner actually trying to let or sell the property would have run.
- An agent with a relevant sector desk, not a generalist high street firm
- A marketing period meeting the policy requirement, with continuous availability rather than gaps
- A board on site, listings on the main commercial property portals, and direct approaches to known occupiers and local agents
- Terms offered flexibly, including leases of different lengths and a sale or a letting
- A quoting price supported by comparable evidence
- A log of every enquiry, what was discussed and why it did not proceed
The enquiry log is the document that decides the point. Ten enquiries that fell away because the building had 4.5 metre eaves and the occupiers needed eight is powerful evidence of obsolescence. Ten enquiries that fell away when the price was quoted is evidence about the price.
Provide the raw material: the agent's report, the particulars, screenshots of the listings with dates, and correspondence. A summary written by the applicant without the underlying record invites the council to appoint its own adviser, which adds two months.
Condition, obsolescence and reasonable prospects
This is where the technical case is made, and it should be measured rather than asserted.
Set out the physical characteristics that determine whether a modern occupier can use the building: clear internal height to the haunch, column spacing, floor loading, door dimensions, yard depth and turning for articulated vehicles, service capacity, parking provision, and the energy performance of the fabric against minimum standards for letting.
Then cost the alternative. What would a refurbishment to a lettable specification cost, what rent would it achieve, and does the resulting value exceed the cost. Where it does not, say so with the figures, and explain the assumptions. A short appraisal from a valuer carries more weight than a paragraph of narrative about how tired the building looks.
Access is frequently the decisive factor and the hardest to fix. A site reached through a residential street cannot serve modern logistics whatever is done to the buildings, and that constraint is permanent rather than a matter of investment.
An illustrative example. A 1960s trade estate of eight units with 4.2 metre eaves, no separate service yard and an access under a railway bridge with a 3.6 metre height limit. Marketing produced steady interest from small businesses and none from anyone who could pay a rent supporting refurbishment. The bridge, not the buildings, was the argument.
Employment land supply arguments
The supply case is about the district rather than the site, and it uses the council's own documents.
Employment land reviews, economic needs assessments and monitoring reports set out how much employment land the authority has, how much it needs over the plan period, and how the existing stock is graded. Many of these studies assess individual sites and grade them, and a site already graded as poor or as a candidate for release is a substantial part of the case made by the authority itself.
Pull out the numbers and present them straight: the identified requirement, the supply against it, the completions in recent years, and where this site sits in the quality hierarchy. An Employment Land Assessment that does that analysis properly is more persuasive than one that recites national policy.
Where the loss is material, an Economic Impact Assessment dealing with jobs displaced and jobs created by the alternative use is worth preparing, particularly where members will decide the application. Be honest about job numbers rather than optimistic, since inflated figures are easy to challenge and damage the rest of the case.
Mixed use and partial retention
The compromise that most often unlocks these sites is retaining or replacing part of the employment floorspace.
Options, roughly in ascending order of what they cost a developer:
- Retain the existing units on part of the site and redevelop the remainder.
- Provide new small business units, built to a modern specification, within the new scheme.
- Provide flexible floorspace capable of employment use under the broader commercial class.
- Deliver replacement floorspace elsewhere, secured through a legal agreement.
Whichever route, the retained element has to be independently viable. Small units squeezed behind a residential block, with shared access and no yard, will be vacant in three years and the authority knows it. Test the retained element as if it were a standalone scheme, and show the servicing, the parking and the hours it can operate without conflicting with the new residents.
Temporary arrangements can also help in the meantime, and meanwhile use and temporary permissions keep a site occupied and rateable while a longer term application progresses. A site that is actively used reads very differently to a committee from a site behind hoardings, which is also the issue behind vacant premises and reoccupation.
Structuring the assessment
Write the document in the order an officer has to reason.
Start with the policy position and the age of the allocation. Then the marketing campaign and its results, with the enquiry log attached. Then the physical analysis of why the site fails modern occupier requirements, with measurements. Then the supply position, using the authority's own evidence. Then what the scheme offers by way of retention, replacement or compensation. Close with the planning balance.
Keep the tone factual. These applications are decided on evidence and on political judgement about jobs, and the evidence is the part you control. Where the council's own study grades the site poorly and the marketing was run properly, the case is usually straightforward. Where the study grades the site as good quality and well located, no amount of marketing evidence will carry it, and the honest advice is to look again at a scheme that keeps employment on the site.
This is general guidance, not legal advice; check the position with your local planning authority or a qualified professional before relying on it.
To see which supporting documents a redevelopment proposal is likely to need, check the site on PlanScope with its postcode.
PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.
Frequently asked questions
How long does a site have to be marketed?
Local plan policies commonly ask for twelve months as a minimum and many ask for eighteen or twenty four on allocated sites. Duration alone rarely settles the argument. A twenty four month campaign at an unrealistic asking price is weaker evidence than a twelve month campaign at a rate supported by comparable transactions, with a documented log of enquiries.
What counts as a realistic asking price?
One supported by comparable evidence from the same sub-market and the same type of building, adjusted for condition, and tested by the response the marketing actually produced. Councils appoint their own advisers to check this. If enquiries stopped at the point the price was quoted, that is evidence about the price rather than about demand.
Can a council refuse simply because the site is allocated?
Allocation carries weight, and the development plan is the starting point for the decision. National policy also says planning policies should avoid the long term protection of sites allocated for employment use where there is no reasonable prospect of a site being used for that purpose, so the allocation is not the end of the argument.
Does partial retention help?
Often substantially. A scheme that rebuilds modern employment floorspace on part of the site and takes another use on the rest addresses the policy objection directly, and it gives officers something to recommend. The test is whether the retained element is lettable in its own right, so size, access, yard depth and servicing have to work on their own.
What is an employment land review and why does it matter?
It is the evidence base a council uses to plan for employment floorspace, identifying supply, need and the quality of existing sites. It often contains an assessment of your site, written by the council's own consultants. Read it before you apply, because a site already graded as poor quality in that study is half the argument made for you.
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.