Loss of a single employment unit: the evidence needed

A council will usually accept the loss of one small employment unit, but only where the application shows there is no reasonable prospect of the building being let or used for employment again. The test is evidential rather than policy-driven. Most adopted local plans protect employment premises as well as allocated employment land, with no floorspace threshold written in, so a single workshop, lock-up or storage unit in a back street still engages a development management policy. The marketing record usually decides it.

That is a very different exercise from a strategic review of employment land supply. Nobody expects a 180 m2 storage unit to be tested against the borough's floorspace needs across the plan period. What the case officer wants is a short, dated, verifiable account of what was tried, at what rent, for how long, and why it failed.

Why a single unit loss still engages the development plan

Section 38(6) of the Planning and Compulsory Purchase Act 2004 requires applications to be determined in accordance with the development plan unless material considerations indicate otherwise. Employment protection policies are almost always drafted to cover "employment land and premises", and premises means any unit in Class B2, Class B8 or the office and light industrial parts of Class E. A 90 m2 unit is caught by the same words as a 9,000 m2 distribution shed.

The routes that bypass this do not help here. General industrial and storage uses sit outside Class E, so the prior approval right under Class MA of Schedule 2 Part 3 of the Town and Country Planning (General Permitted Development) (England) Order 2015 is not available to a B2 or B8 building. You are making a full planning application, and the employment policy will be the first reason for refusal if the evidence is thin.

Landlords often arrive having already decided the unit is finished. The officer has not. Treat the policy as a hurdle with a known height rather than an obstacle to argue away.

Marketing evidence that stands up

Most plans specify a continuous marketing period, and 12 months is the figure that appears most often. Check the wording of your own authority's policy, because some ask for 18 months and others set no period at all and simply require evidence of genuine marketing. Where a period is specified, it means continuous and recent, not 12 months assembled from three separate attempts across six years.

A marketing record that survives scrutiny contains:

1. The agent's instruction letter, dated, naming the agent and the terms on which the unit was offered.
2. Photographs of the board on site, dated, with enough context to show the location.
3. Screenshots or listing references from the agent's own site and at least one commercial property portal, with the dates they went live.
4. The asking rent, the lease length offered, and whether a new lease at market rent was actually on the table rather than a short assured shorthold of the yard.
5. A schedule of every enquiry, viewing and offer, with the date, the party's sector, and the stated reason it went no further.
6. Comparable local lettings used to benchmark the asking rent.

The failure modes are predictable. Marketing only for freehold sale with vacant possession tests the investment market, not occupier demand. An asking rent set at residential land value is not a market rent and an officer who knows the area will say so. And a nine-month campaign that straddles Christmas and the August shutdown is not nine months of marketing.

Instruct an agent who lets small industrial space locally. A residential agency handling a shop-to-flats scheme will produce a marketing file that reads exactly like what it is.

Condition and specification of the building

Condition evidence does the work that marketing evidence cannot. A unit can be marketed properly at a sensible rent and still fail because it is unlettable on its specification, and that is a separate, stronger argument.

Measure and record the things an occupier actually asks about: clear internal height to the underside of the structure, eaves height, floor loading, roller shutter width and head height, whether a rigid lorry can turn within the site, electrical supply and whether three-phase is present, drainage, and the energy performance certificate rating. On energy, the minimum energy efficiency standards bite: since 1 April 2018 a landlord has not been able to grant a new tenancy of a non-domestic property rated F or G, and since 1 April 2023 continued letting of such a property has been unlawful without a registered exemption. A G-rated unit with a £95,000 upgrade bill and a market rent of a few thousand pounds a year is a defensible reason for loss.

Asbestos surveys, structural reports and a costed schedule of works turn an assertion into arithmetic. Set the cost of making the unit lettable against the rent it would then command, over a realistic lease term. If the sums do not work, say so in a sentence and show the figures in an appendix.

Demand evidence at small scale

Strategic demand studies are the wrong tool. What helps is local, dated and checkable.

Start with the authority's own published monitoring: the annual monitoring report, the employment land review that sits behind the local plan, and any town centre health check. If the council's own evidence base records surplus small industrial floorspace in the ward, quote it and cite the document and page. An authority finds it hard to reject its own numbers.

Then add a dated desk survey of comparable vacant units within a stated radius, with the method written out so the officer can repeat it. A letter from the marketing agent setting out local demand conditions carries some weight, though less than the enquiry log it should be attached to. Keep away from unsourced claims about the market. An employment land assessment prepared for a scheme of this size is usually disproportionate, and saying so in the covering text is better than producing a thin one.

Re-provision, mixed use and partial retention

Officers are far more comfortable approving a scheme that keeps some employment capacity. Three options come up repeatedly, and one of them often unlocks a difficult case.

Ground-floor commercial with homes above keeps the use and the rateable frontage. Replacing a poor unit with a smaller modern one, on the same site, trades floorspace for quality and is easy to defend with the condition evidence you have already assembled. Flexible studio or workshop space in Class E(g)(i) suits sites where the old use was never viable but small-business demand exists.

Each of these changes your document bundle. A mixed-use scheme brings in noise between the commercial and residential parts, refuse separation, servicing arrangements and often a parking survey to show that the new homes do not worsen local parking stress. The report types grouped by category are a quicker way to scope that than working through a validation list cold.

Where authorities accept the loss

Some sites are simply in the wrong place for an employment use, and the plan usually says so somewhere. The arguments that land are conflict with surrounding residential amenity, and the physical realities of access.

Noise is the strongest of these. Where the lawful use could operate plant, run compressors or take deliveries at 6am, a BS 4142:2014+A1:2019 assessment of the existing use against nearby dwellings can show that intensifying the employment use would be refused on amenity grounds. The same logic applies to air quality where the unit generates vehicle movements past habitable room windows, and identifying the right receptors matters more than the model.

Access is the other. A unit reached over a 2.8 m shared drive between two terraced houses cannot take a 7.5 tonne vehicle, and no amount of marketing changes that.

Illustrative example: a 180 m2 single-storey store at the end of a 1930s terrace, 3.1 m to the underside of the trusses, single-phase power, EPC band F, accessed over a shared drive with no turning space. Twelve months of marketing at £6.50 per ft2 produced four viewings and no offers, three of them citing access. The condition schedule put £71,000 against re-roofing, re-wiring and a new shutter. That package of evidence is the case, and the figures above are illustrative only.

Putting the case together

Keep it short. A Planning Statement of eight to twelve pages with the policy test set out, the evidence summarised against each limb of it, and the detail in appendices will be read properly. A fifty-page document will not.

Deal with demolition and construction effects in a separate note where neighbours are close, since the questions about hoardings, wheel washing and working hours arrive whatever the merits of the employment case. The site set-up and demolition content of a construction management plan covers what officers ask for.

Order the appendices the way the policy reads, not the way you assembled them. Marketing file, condition and cost schedule, local demand evidence, then the re-provision option you rejected and why. Officers under time pressure read the statement and dip into appendices they can find.

Enter your postcode on PlanScope to see which reports a change of use on your site is likely to need, then send the draft for professional review.

This is general guidance, not legal advice. Check the position with your local planning authority or a qualified professional before relying on it, and read your own authority's employment policy wording rather than a neighbouring borough's.

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