Employment Land Assessment: the anatomy of the report

An employment land assessment answers one question: should this site stay in employment use. Everything in the report exists to support or undermine that conclusion, and the two sections that decide it are the definition of the market area and the site quality scoring. Get either wrong and the rest of the analysis, however careful, points at the wrong answer.

The employment land assessment structure used for a development plan evidence base and the version used to support a single planning application are the same document at different scales. The plan-making version covers every employment site in the authority; the application version covers one site but has to position it within the same portfolio logic. An assessment that looks only at the application site, with no view of local supply, will be given very little weight.

Defining the functional economic market area

The market area is the geography within which firms and workers actually operate, and it rarely matches the district boundary. Planning Practice Guidance on housing and economic needs assessments sets out the factors: travel-to-work patterns, housing market areas, the catchments of transport networks, the flow of goods and services, and administrative geography where it reflects a real economic relationship.

Define it, justify it in a paragraph, and then keep it. The commonest failure in an application-stage assessment is a market area drawn just widely enough to include two vacant industrial estates, so that local supply looks adequate and release of the application site looks harmless. An officer will redraw it, and the conclusion changes.

Where the authority has already defined a functional economic market area in its adopted plan evidence base, use that definition unless you have a reasoned case for departing from it. Arguing about the geography is a poor use of a contested application.

Baseline supply and site quality scoring

The supply section inventories the employment land in the market area: allocated sites, sites with permission, vacant premises and land in active use. For each, the assessment records area in hectares, floorspace in m², use type, tenure, occupancy and status.

Then comes the scoring, which is the analytical core. A site quality assessment scores each site against consistent criteria so that sites can be compared rather than described.

Publish the scoring scale and the score for every site, not just the application site. A table showing the application site scoring poorly against six comparators is a much stronger argument for release than three pages of narrative saying the same thing. And it can be checked, which is what gives it weight.

Demand evidence and take-up rates

Demand is evidenced three ways, and a credible assessment uses all three. Past take-up of employment land over a run of years, drawn from the authority's own monitoring reports. Forward-looking need, derived from employment projections converted to floorspace using employment densities. And current market signals: enquiry levels, void rates, rents and the length of time units sit empty.

The three often disagree, and that disagreement is worth reporting rather than smoothing over. A market with high past take-up and high current voids is telling you something about the type of space rather than the quantity, and that distinction matters when the argument is about whether a particular site is the right one to keep.

Convert projections to land requirements transparently. State the employment density used for each use type, the plot ratio assumed, and the vacancy allowance built in to allow for churn. Those three assumptions drive the headline requirement figure, and an officer or an inspector will test each of them.

Assessing the site against the portfolio

This is the section that most assessments skip, and the one that decides the outcome. Having scored the portfolio, position the application site within it: where it sits on quality, whether its function is duplicated elsewhere, whether it serves a role no other site serves, and what the portfolio looks like with and without it.

The strongest release arguments rest on function rather than on quality alone. A site scoring moderately but providing the only small-unit accommodation in the market area is hard to release. A high-scoring site whose function is replicated by three better-connected sites is a more straightforward case. That kind of reasoning also protects against the obvious objection: if every poorly scoring site were released one at a time, the portfolio would disappear.

An illustrative example: a 1.4 hectare yard with a single access through a residential street, scoring poorly on access and compatibility, in a market area with 12 hectares of allocated land including a serviced estate 2 km away offering comparable unit sizes. The case for release is about the mismatch between the site and the use rather than about the value of housing on it.

Marketing evidence where release is proposed

Where the application proposes loss of employment land, authorities almost always ask for marketing evidence. What they look for:

1. A marketing period long enough to be meaningful, commonly 12 to 24 months of continuous active marketing, with the exact policy requirement set out in the adopted local plan.
2. Marketing at a realistic asking price or rent, evidenced against comparable transactions rather than asserted.
3. A record of the agents instructed, the particulars issued, the platforms used and the signage on site.
4. A schedule of enquiries with dates, the nature of each enquiry and the reason it did not proceed.
5. Any conditional offers received and why they lapsed.

Point two is where marketing evidence usually fails. A site marketed at a price reflecting hope value for residential development has not been marketed for employment use in any real sense, and an inspector will say so. Record the valuation basis openly.

Conclusions, and how the assessment is used at appeal

The conclusion needs to do two things: answer the retention or release question directly, and state the residual effect on the portfolio in hectares and m². Vague conclusions get vague weight.

At appeal, the assessment is tested against the authority's own evidence base, so any departure from the adopted plan's market area definition, density assumptions or site scoring will be put to you. Cross-reference the authority's monitoring report and employment land review, and explain each difference. Where the adopted evidence base is old, say how old and explain what has changed since, with sourced market data rather than assertion.

An Employment Land Assessment is a different document from an economic impact appraisal, which measures the effects of a proposal rather than the adequacy of land supply. Where a scheme needs both, keep the assumptions consistent between them. Other evidence in a major commercial pack follows the same discipline of publishing method before conclusion, whether that is the trade diversion analysis in a retail impact test or the credit logic behind a BREEAM pre-assessment. The full report index shows what else a mixed-use redevelopment usually carries.

Councils generally expect a suitably qualified author for employment land evidence, and professional review is strongly advised. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.