General industrial to storage and distribution: B2 to B8

Moving a unit from Class B2 general industrial to Class B8 storage and distribution looks like a paperwork exercise and is usually not one. There is a permitted change in the General Permitted Development Order, but it is capped by floorspace, so it covers a bay or a small unit rather than a whole estate.

Above that cap you are making a planning application, and the case will turn on two things. Whether the local plan protects the industrial capacity you are giving up, and whether the highway network can take a B8 vehicle profile on an access designed for a B2 one.

The distinction between B2 and B8

Class B2 covers industrial processes other than those that can be carried out in a residential area without detriment to amenity. Class B8 covers use for storage or as a distribution centre, including open air storage.

The practical test is what actually happens on the floor. Assembly, fabrication, machining, spray finishing and treatment are B2. Receiving, holding, picking and despatching goods is B8, even where some light handling occurs.

Hybrid operations are where classification breaks down. A unit that cuts and packs materials to order may be both, and the answer depends on the primary use and on whether the other activity is ancillary in substance. That question is decided at the level of the planning unit, and the note on the planning unit and why it decides your change of use covers how the boundary is drawn.

Get this right before anything else, because a change of use application that describes the existing use incorrectly is vulnerable from the first day.

The permitted change and its floorspace limit

Part 3 of Schedule 2 to the General Permitted Development Order 2015 contains a class permitting change from general industrial to storage and distribution, subject to a floorspace cap on the amount of building changing use.

Check the current wording of Part 3 rather than relying on a figure you remember. The use classes and the permitted changes were both rewritten in 2020 when Class E was introduced, and several older limits no longer apply as they once did.

Two features of the permitted change catch people out. The cap applies to the floorspace changing use, so splitting a building into phases does not multiply the allowance. And the right can be removed by condition on an earlier permission or by an Article 4 direction, which is common on industrial estates that councils want to keep in production use.

Where the change is permitted, write to the authority confirming the position and keep the reply. Better still, apply for a lawful development certificate, which is the only formal way to confirm that the change is lawful and is worth its fee when a lease or a funding condition depends on the answer.

Traffic and servicing, the real planning issue

B8 has fewer people and more lorries per square metre than B2. That single sentence explains most refusals.

Staff parking demand falls, which sounds helpful until you realise that the yard was sized around cars rather than around articulated vehicle manoeuvring. Then the questions start. Can a 16.5 metre articulated vehicle enter and leave in forward gear. Is the yard deep enough for a reversing manoeuvre clear of the highway. Where do drivers wait, and is there a marshalling area so that vehicles do not queue on the street.

A transport statement with swept paths, a trip generation comparison between the existing and proposed use, and a servicing schedule setting out expected daily movements answers this properly. Where the change is large enough to meet the authority's threshold, a full transport assessment and a travel plan follow instead.

Do not use a national trip rate database uncritically. Trip rates for warehousing vary enormously with the operator, and a parcel hub, a cold store and a builders merchant behave nothing alike. Say which comparator sites you used and why.

Noise, hours and the amenity comparison

Councils often assume that B8 is quieter than B2, and residents who live near the estate usually know better.

Industrial noise tends to be internal and daytime. Storage and distribution noise is external, and it is the reversing alarms, the yard movements, the refrigeration units and the early morning loading that generate complaints. Assessed against the relevant British Standard for industrial and commercial sound, a 24-hour B8 operation can perform worse at a residential boundary than the B2 use it replaced.

If the operation will run outside normal hours, say so in the application rather than seeking to extend an hours condition later. An honest application with a noise assessment and proposed mitigation is easier to grant than a retrospective variation after the complaints start.

Employment land policy and the loss of production capacity

Many local plans protect designated employment land and set a policy test for changes within it. Some protect B2 capacity specifically, on the basis that general industrial floorspace is hard to replace and supports higher employment densities than warehousing.

Where such a policy applies, the application needs evidence rather than assertion. Marketing evidence for the existing use over a reasonable period, at a realistic rent, through agents active in that market. Evidence on the building's suitability for continued B2 use, including power supply, floor loading, eaves height and ventilation. And an account of the employment the proposed use will actually support.

Put that case in the planning statement and structure it against the wording of the policy, criterion by criterion. Officers assess against the policy text, so an argument organised any other way makes their job harder.

Evidence of the existing lawful use

You cannot rely on a permitted change from B2 if the lawful use is something else.

Assemble the evidence early. Historic planning permissions and their conditions, rating records, leases and licences, dated photographs, and statements from people who worked in the building. Where the B2 use stopped some years ago, consider whether it has been abandoned, because proving a use has been abandoned cuts both ways and an authority may argue that the fallback no longer exists.

A certificate of lawfulness for the existing use is the clean solution where the history is muddled. It costs a fee and some time, and it removes the argument from the change of use application entirely.

Conditions that restrict future flexibility

Read the conditions on the permission you are granted as carefully as the decision itself.

Authorities frequently attach conditions restricting the use to B8 only and excluding any change permitted by the Order, limiting hours of operation and HGV movements, requiring a servicing management plan, or controlling external lighting and yard storage height. Each of those is a constraint on the next occupier and on the investment value.

Where a condition is unreasonable, the six tests for conditions apply and there is a route to challenge it. Where it is reasonable, negotiate the wording before issue rather than after. A movement cap expressed as a daily average is a very different commercial proposition from one expressed as an absolute maximum, and the difference is usually settled in an email during the determination period.

Anyone weighing whether a lighter industrial use would sit better with the neighbours should also look at light industrial under Class E(g)(iii), which has a different amenity test again.

This is general guidance, not legal advice. Use classes, permitted changes and local policy all change, so check the current position with your local planning authority or a qualified professional before relying on it.

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