Light industrial or general industrial: the amenity test

The line between light industrial and general industrial turns on one sentence in the Use Classes Order, and it asks a hypothetical question. Class E(g)(iii) covers an industrial process which can be carried out in any residential area without detriment to the amenity of that area by reason of noise, vibration, smell, fumes, smoke, soot, ash, dust or grit. Class B2 catches everything else that counts as an industrial process.

So the question is never whether your neighbours are houses. It is whether the process you propose could sit behind a row of terraces somewhere in England without causing a problem. A unit in the middle of a 200 unit estate can still be B2, and a unit backing onto gardens can still be E(g)(iii).

Reading the wording carefully

Two definitions do the work. An industrial process, under article 2 of the Order, is a process for or incidental to making, altering, repairing, adapting for sale, breaking up or demolishing an article, or getting, dressing or treating minerals, carried on in the course of trade or business other than agriculture. Assembly, packing and repair all count.

Then comes the amenity filter. The list of eight nuisances is exhaustive, which matters more than people expect. Traffic generation is not on it. Visual impact is not on it. A process that brings 40 lorry movements a day but makes no noise, smell or dust is still capable of being light industrial, however unwelcome the lorries would be in a residential street.

That does not make the traffic irrelevant to the planning decision. It makes it irrelevant to the classification. Those are separate questions, and conflating them is the commonest mistake in change of use submissions.

How officers apply the test in practice

Case officers rarely reason from first principles. They ask what equipment is being used, at what hours, with what extraction, and whether the operation is enclosed.

A joinery workshop with hand tools, dust extraction to a filtered internal unit and no external discharge usually reads as light industrial. The same workshop with a spray booth discharging through a roof stack does not. A bakery producing for its own shop is different from one running overnight with a diesel delivery fleet and a bread odour plume.

Three questions decide most cases. Does the process produce impulsive or tonal noise audible outside the building. Does it discharge anything to air. Does it transmit vibration into the structure or the ground. If the answer to all three is no, and the process is properly contained, you are in E(g)(iii) territory. Further detail on borderline operations sits in the discussion of what qualifies as light industrial under Class E(g)(iii).

Processes that push a unit into B2

There is no statutory list, but the pattern is consistent across decisions. Metal fabrication involving cutting, grinding and hammering. Foundry and casting work. Spray painting and powder coating. Plastics extrusion and injection moulding. Vehicle body repair and resprays. Tyre remoulding. Rendering, smoking or frying at production scale. Skip handling, crushing and aggregate processing, which often move past B2 into sui generis territory altogether.

Scale changes the answer in one direction only. A small process that grows until extraction, deliveries and plant become obvious can move from E into B2 as a matter of fact, and that is a material change of use requiring permission even though nothing was ever built.

Most enforcement cases in this area start with a complaint about noise at 6am rather than with a planning officer noticing anything. By then the operator has usually invested in plant on the assumption that the unit was light industrial, and the argument becomes an expensive one about the lawful use.

The reverse also happens. A B2 consent inherited with a building does not oblige you to operate at that intensity, and a quieter occupier can often establish an E(g)(iii) use as a matter of fact. But proving it later, without a certificate, is harder than obtaining one at the point of change.

The evidence that supports your description

If you are applying for a change of use, or seeking a certificate confirming the existing use, describe the process rather than the class. Set out the equipment schedule, the hours, the extraction arrangements and the delivery pattern, then explain why the process meets the statutory description.

Where noise is the pinch point, an assessment following the industrial and commercial sound standard gives the officer something to work with, comparing the rating level of the source against the background sound level at the nearest noise sensitive receptor. Where discharge to air is involved, a Ventilation and Extraction Statement covering the system, the discharge point, the filtration and the maintenance regime does more to settle an application than any amount of narrative. Vibration, where it arises, is assessed against the human exposure standard rather than the noise one.

A Planning Statement then ties the process description to the development plan policies on employment land, amenity and the local approach to industrial uses.

Why the classification decides your next five years

Movement within Class E needs no planning permission. A lawful E(g)(iii) unit can become an office, a dental practice, a nursery, a gym or a shop without an application, subject to any condition on the original permission and to any Article 4 direction in force.

A B2 unit has no such freedom. The permitted development rights in Part 3 of Schedule 2 to the General Permitted Development Order have allowed some movement out of the industrial classes over the years, with floorspace limits and qualifying conditions attached, and they have been amended repeatedly since 2020. Check the current text of the Order rather than relying on a summary.

For anyone buying or leasing, the practical instruction is simple. Establish the lawful use from the planning history, read every condition on the last permission, and keep evidence of every move within Class E so the position can be proved later. A unit described as E in the marketing particulars may carry a condition limiting it to a single named process.

Conditions, hours and the description on the application form

Councils commonly grant a change of use subject to conditions that restrict the process, exclude named activities, cap hours of operation, or require plant to be maintained so that the rating level does not exceed the background by a stated margin. Some go further and tie the permission to a particular occupier.

Read those conditions as part of the asset. A condition excluding spray application, or restricting the use to the process described in a named document, converts an apparently flexible Class E consent into something much narrower.

And get the description right on the form. Applying for B2 when the process is plainly light industrial invites a condition you do not need. Applying for E(g)(iii) when the process involves a spray booth invites a refusal, or worse, a permission that later turns out not to authorise what you are doing.

Enter the unit postcode on PlanScope to see which supporting documents a change of use at your premises is likely to need. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval. This is general guidance, not legal advice. A lawful development certificate is the only formal way to confirm that a use is lawful, so check the position with your local planning authority or a qualified professional before relying on it.