Open storage in a commercial yard and the curtilage question

Using a yard for open storage is lawful without permission where the storage is ancillary to the use of the building it serves. It needs permission where it has become a storage use in its own right, which in use class terms means Class B8. The line between the two is not about area or neatness. It is about whether the yard still serves the primary use of the planning unit, or whether it has become a separate activity with its own purpose, and that question is answered on the facts rather than from a policy document.

When yard storage is a material change of use

Section 55 of the Town and Country Planning Act 1990 makes a material change in the use of land development requiring permission. The starting point is identifying the planning unit, and the tests the courts set out in Burdle are still the ones used: a single main purpose with activities ancillary to it, or two or more activities with none dominant, or physically distinct areas used for substantially different purposes.

Apply that to a typical yard. A joinery workshop storing timber, offcuts and finished units outside is doing something ancillary to the workshop. The same yard rented to a neighbouring haulier for trailer parking is doing something else entirely, with its own customer, its own vehicles and its own purpose. The second is a change of use even though the physical appearance may be similar.

Intensification alone does not automatically make a material change. The test is whether the character of the use has changed. A yard with four pallets that now holds forty is probably the same use more busily pursued. A yard with four pallets that now holds forty containers let to third parties is not.

Ancillary storage against a separate storage use

Five factual indicators do most of the work, and it is worth assembling evidence on each before asserting a lawful position.

1. Whose goods are stored. Goods belonging to the occupier of the building point to an ancillary use. Third party goods point to a separate one.
2. Whether the storage generates its own vehicle movements, separate from the building's.
3. Whether the yard is physically or operationally separated from the building, by fencing, metering, a separate access or a separate tenancy.
4. The proportion of the site and of the turnover the storage accounts for.
5. Whether the storage would continue if the building use stopped.

That last question is the clearest single test in practice. If the answer is yes, you are probably looking at a separate use.

Where the position is uncertain and the use has been running for some years, a certificate of lawfulness of existing use under section 191 of the 1990 Act is the only way to settle it with any security. Immunity periods in England were extended by the Levelling-up and Regeneration Act 2023, and which period applies depends on when the use began, so establish the dates with documentary evidence first: invoices, tenancy agreements, aerial imagery, utility bills.

Containers, racking and whether they are buildings

A container sitting on a yard may be nothing at all in planning terms, or it may be operational development. The courts look at size, degree of permanence and degree of physical attachment to the land.

A single container delivered and collected within weeks is a chattel. A row of containers on prepared bases, serviced with power, in position for years and used as fixed storage, is development and needs permission. Racking is treated the same way: free-standing light racking is equipment, while a steel structure bolted to a slab with a roof over it is a building.

Stacking containers changes the analysis again, because a two or three high stack reads as a structure and is assessed on its visual effect whether or not it is development.

Stack height, screening and visual effect

Height is the single issue most often conditioned, because it is the one that affects people off site. A yard enclosed by a 2.4 metre fence with material stacked to 2 metres is invisible. The same yard stacked to 5 metres is visible for some distance, and in an open countryside or edge of settlement location that is a planning objection in its own right.

The practical response is to define a storage area on the plan, with a maximum height, and to show the sections. Then back it with planting or an acoustic fence where there are residential neighbours. Offer the height limit rather than waiting for it, because an offered limit is usually more generous than an imposed one.

Where the yard adjoins housing, plant and vehicle noise matters as much as appearance, and a Noise Impact Assessment measuring the real background level at the nearest facade is the document that answers an environmental health objection.

Surface water, hardstanding and pollution control

Laying a hard surface is an engineering operation, so it is development, but there is a permitted development right for a hard surface within the curtilage of an industrial building or warehouse for the purposes of the undertaking, in Part 7 of Schedule 2 to the General Permitted Development Order 2015. Read the limits before relying on it, because the right is narrower than it sounds and does not extend to land outside the curtilage.

Three drainage points recur on yard applications.

Run-off from a sealed yard reaches a watercourse faster and dirtier than run-off from a gravel surface, so the drainage strategy needs attenuation and treatment rather than a connection. Where vehicles are parked, loaded or maintained, an oil interceptor and a maintenance regime are expected, and a discharge to a watercourse or to ground may need an environmental permit separately from planning. And where goods include anything that could leach, the authority will ask about containment, bunding and spill response.

Vehicle movements and the highway position

The highway authority will want to know the number and type of vehicle movements, the access geometry, visibility splays, and whether an articulated vehicle can enter, turn and leave in forward gear without using the public highway to manoeuvre.

A Transport Statement with swept path drawings answers most of that at this scale. Where the yard is reached through a residential street, expect the movements to be the deciding issue, and expect a condition restricting hours of deliveries. The retail style tests that apply to other yard conversions are a separate matter, covered in our note on cash and carry to trade counter.

One more route worth knowing. Part 4 of Schedule 2 permits the temporary use of land for most purposes for a limited number of days each calendar year. That is useful for seasonal storage and useless as a cover for a permanent operation, because the days are counted.

Conditions to expect and to offer

The conditions that tend to appear on an open storage permission are predictable, and offering them shapes them.

A defined storage area shown on an approved plan. A maximum stack height. A limit on hours for deliveries and for plant operation. A requirement that no storage takes place outside the defined area, including on the access or the frontage. Retention and replacement of boundary planting. A drainage and pollution prevention scheme with a maintenance obligation. And, where the use is a new B8 use, sometimes a restriction preventing the yard being let separately from the building, which is worth resisting if you want flexibility later.

As an illustrative example, a vehicle repair workshop with a half hectare rear yard might lawfully store customer vehicles and parts outside as ancillary storage, and then need permission once it begins storing containers for a removals company, because that storage would continue if the workshop closed. The application would define the container area, cap the stacks at two high, screen the eastern boundary and limit deliveries to weekdays.

Work out which side of the line your yard sits on before you take a tenant. This is general guidance rather than legal advice, so check the position with your local planning authority or a planning consultant before relying on it. Enter your postcode on PlanScope to see which documents a yard application 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.