The supply chapter of an Employment Land Assessment
The supply chapter decides whether a designated employment site can be released. Here is what it must establish, how marketing evidence is judged, and how councils test the conclusion.
The supply chapter of an Employment Land Assessment does one job: it establishes how much employment land and floorspace the area actually has, in what condition, and whether the site you are promoting still contributes anything useful to that stock. Get the employment land assessment supply evidence wrong and the rest of the report collapses, because a case for releasing a designated site to housing or another use stands or falls on whether the authority accepts that the supply is adequate without it. This is the chapter officers read first and the one that draws the most detailed objection.
It is also the chapter most often written backwards, starting from the conclusion the client wants and working towards it.
What the supply chapter has to establish
Three findings, in order. First, the quantity of employment land and floorspace in the authority's area, split between what is built and occupied, what is built and vacant, and what is allocated but undelivered. Second, whether that stock is of a quality and in a location that the market will take up. Third, what happens to the balance if your site comes out of it.
The third finding is the only one that matters to the decision, but it has no force unless the first two are set out honestly. An assessment that reports a headline surplus of employment land without saying how much of it is a waterlogged allocation behind a level crossing is not evidence. It is arithmetic.
National practice guidance on housing and economic land availability sets the method for identifying and assessing sites, and it is worth following its sequence even where the authority has its own brief. Deviating from it invites the objection that the study is bespoke to the applicant.
Counting quantity, quality and location
Quantity is the easy part and still goes wrong. The base date must be stated, the source of the floorspace figures must be named, and the units must be consistent throughout. Mixing gross external area in one table with net internal area in the next is the single most common reason a supply chapter is picked apart by a consultee.
Quality needs a site-by-site judgement, recorded in a schedule. Age and specification of the buildings, eaves height, yard depth, service arrangements, power supply, floor loading, and whether the units can be sub-divided. For allocated but undelivered land, the questions change: ownership, access, ground conditions, abnormal costs and whether anything has come forward on the allocation since it was made.
Location covers strategic road access, distance to the labour catchment, public transport for shift patterns, and compatibility with what has grown up around the site. A 1970s general industrial estate that now has flats on three boundaries has a location problem that no amount of refurbishment fixes.
| Supply category | What to record | Why it matters |
|---|---|---|
| Occupied and fit for purpose | Floorspace, use class, tenure | Forms the working stock the policy protects |
| Vacant and marketable | Floorspace, void period, asking terms | Tests whether demand is being met |
| Vacant and obsolete | Floorspace, defects, cost to remedy | Often counted as supply when it should not be |
| Allocated, undelivered | Area, constraints, ownership | The gap between plan and delivery |
Testing whether a site remains suitable
Suitability is a judgement about the future, not a description of the present. A site can be fully let and still be unsuitable in ten years if the units are too small for the occupiers now looking in that market. Equally, a vacant site is not unsuitable simply because it is vacant.
Work through the building first, then the plot, then the setting. Can the structure be brought to a modern letting standard at a cost the rent supports? Is the yard deep enough for the vehicles the likely occupiers run? Would an intensified use be acceptable in amenity terms given what adjoins it? Where the answer to the last question is no, say so plainly and record the constraint, because that is often the strongest part of a release case.
Councils are alert to circular reasoning here. A site left to fall into disrepair by an owner who wants to sell it for housing will attract the response that the obsolescence is self-induced. Address that head-on with a repair and reletting cost, rather than hoping nobody raises it.
Marketing evidence and how long it must run
Most adopted policies protecting employment land require marketing evidence before a loss is accepted, and most specify a minimum continuous period. The period is set by the policy, so read the wording rather than assuming a figure. Check whether it runs from the date marketing started or the date of the application, and whether it must be unbroken.
What a credible marketing exercise looks like:
- Instruction of an agent active in that industrial or office market, with the instruction letter available.
- Quoting terms at or below the level supported by comparable lettings, evidenced.
- Board on site, online listing on the agent's own site and the main commercial portals, and a mailing to occupiers and retained agents.
- A logged record of enquiries, viewings, offers and the reason each fell away.
- A report at the end from the agent, signed, setting out conclusions.
The enquiry log is the part that persuades. An assertion that there was no interest carries little weight against a log showing 14 enquiries, four viewings and two offers withdrawn on survey. Quoting terms are where marketing cases usually fail. If the asking rent sits well above anything achieved locally, the authority will treat the exercise as marketing designed to fail, and it will be right to.
Demand evidence and market signals
Supply means nothing without the demand side beside it. Take-up over a run of years, average void periods, rent and yield movement, the size bands where enquiries cluster, and any requirements known to local agents that the existing stock cannot satisfy. Where you cannot source a figure, describe the effect and name who told you rather than inventing a number.
Market signals also include what is happening to the same use class nearby. A borough losing small workshop units steadily while gaining large distribution sheds has a supply problem that a floorspace total conceals entirely. Break the figures down by unit size band and the picture usually changes.
Note: national guidance expects economic needs to be assessed over the plan period, so a snapshot of current vacancy is a weak substitute for a trend.
Where release of a site is justified
The strongest release cases share a shape. There is sufficient supply of the relevant type elsewhere in the area, the site itself is unable to serve the modern market, marketing at realistic terms has run its course, and the proposed use delivers something the plan is short of. Each limb is evidenced separately.
Illustrative example: a 0.6 hectare storage and distribution site with 1960s units, 4.2 metre eaves and a 12 metre yard, backing onto two-storey housing on two sides. The supply chapter records adequate modern provision within the same travel-to-work area, a completed 18 month marketing exercise with a logged enquiry trail, a structural cost to bring the units to a lettable standard exceeding the value on completion, and an amenity constraint that caps operating hours. That combination answers a policy test. Any one limb alone does not. The figures here are illustrative and not drawn from a real site.
Where the local plan policy allows release only in defined circumstances, quote the policy wording and answer it clause by clause in your Planning Statement rather than in a general narrative. Officers write their report against the policy text.
How the authority tests your conclusion
Expect the economic development team, not just the planning officer, to comment. They will check the base date, re-run the totals, look for sites you have excluded, and compare your take-up figures with the authority's own monitoring. They will also ask whether the marketing agent was instructed to let or sell the property in earnest.
Two responses are common. The first accepts the site-specific case but disputes the area-wide surplus, which usually means the argument narrows to whether an allocation elsewhere is deliverable. The second accepts the supply position but treats the marketing as inadequate, which is recoverable by extending the exercise rather than by arguing. Neither is a refusal you cannot plan for.
Where the release involves other consequences, an Economic Impact Assessment covering jobs displaced and created, or a Viability Assessment where the redevelopment cost is the real driver, will usually be asked for alongside. Scope them at the same time rather than in sequence, because the inputs overlap.
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. To see which of the 66 report types your scheme is likely to need, enter your postcode on PlanScope.
Frequently asked questions
How long must marketing run before a council accepts the loss of an employment site?
There is no national figure. The minimum period is set by the adopted local plan policy or a supplementary planning document, and it varies between authorities. Read the policy wording carefully, because some require a continuous unbroken period and others measure it from the date of the application. Where the wording is unclear, agree the period with the case officer at pre-application stage.
Does vacant floorspace count as employment land supply?
It counts as floorspace but not necessarily as usable supply. A vacant unit that is obsolete, unlettable at any realistic rent or constrained by its setting contributes little to meeting demand. Record it separately in the schedule, state the defects and the cost to remedy them, and explain why it should or should not be treated as part of the working stock.
What is the difference between an Employment Land Assessment and a plan-making land availability study?
A plan-making study assesses all sites across the authority to inform allocations over the plan period. An Employment Land Assessment submitted with an application is narrower, testing whether one site should remain in employment use against the area-wide picture. The method overlaps, and using the national practice guidance sequence makes the two easier to compare.
Who should prepare the marketing evidence?
An agent who is active in that local industrial or office market and who has been instructed to let or sell the property. Keep the instruction letter, the quoting terms, the listings, the board photographs and a dated log of enquiries, viewings and offers. A signed closing report from the agent explaining the outcome carries more weight than a summary written by the applicant.
Can a site be released purely because redevelopment is more profitable?
No. Higher value in an alternative use is not by itself a reason to release protected employment land. The case has to show that the site no longer serves the market, that supply elsewhere is adequate, and that marketing on realistic terms has failed. Viability evidence supports that case but does not replace it.
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.