Redundant farm buildings and the demolition question

Pulling down a redundant Dutch barn is usually the cheapest thing on a farm's to-do list and often the most expensive decision on it. The demolish agricultural building planning question has a short answer for most freestanding farm structures: demolition of a building that is not a dwellinghouse and does not adjoin one generally falls outside the definition of development, so no application is needed. The expensive part is what demolition destroys, because a barn that no longer exists cannot be converted under Class Q, and the fallback value goes with the roof sheets.

Conservation areas, listed holdings and asbestos each change the answer, and so do the bats.

Whether demolition needs an application

Section 55(1A) of the Town and Country Planning Act 1990 confirms that building operations include the demolition of buildings, so demolition is capable of being development. Section 55(2)(g) then allows the Secretary of State to direct that demolition of specified descriptions of building is not development.

The direction in force, made in 2014, covers buildings other than dwellinghouses and buildings adjoining dwellinghouses, buildings with a cubic content not exceeding 50 cubic metres, and gates, fences, walls and other means of enclosure. A standalone grain store, a cubicle shed or a silage clamp in the middle of a yard therefore sits outside the definition of development altogether.

That is the general position and not a universal one. Verify the current direction text with the council before you book the machine, because the exceptions attach to the building, not to the farm.

Prior notification and what it covers

Where demolition is development, Class B of Part 11 of the General Permitted Development Order 2015 permits it, subject to a condition that bites before anything comes down.

Unless the demolition is urgent for safety reasons, you must apply to the council for a determination as to whether its prior approval is required for the method of demolition and for any proposed restoration of the site. If the council says approval is required, you then submit those details and wait. If it says no, you proceed.

Two points of practice. The determination is about method and restoration only, so the council cannot use it to refuse the demolition itself. And the restoration element matters more on farms than people expect: a council can require the slab to be broken out, the hardcore removed and the ground returned to agricultural condition, which turns a two-day job into a two-week one.

Class B does not apply where the building has been rendered unsafe by the owner's deliberate action or neglect, where the works amount to relevant demolition in a conservation area, or where the building is listed or scheduled.

Demolition in a conservation area or on a listed holding

In a conservation area, demolition of a building is relevant demolition under section 196D of the Town and Country Planning Act 1990, and carrying it out without planning permission is a criminal offence. Small structures are excepted, but the threshold is low and the consequence of guessing wrong is prosecution rather than a retrospective application.

On a listed holding the trap is the curtilage rule. A building within the curtilage of a listed building that was erected before 1 July 1948 is treated as part of the listed building, so a cart shed behind a Grade II farmhouse is listed whether or not it is mentioned in the list entry. Demolishing it needs listed building consent, and again the offence is criminal.

Where demolition of a historic farm building is accepted, the council will usually require a written and photographic record first. That is a Historic Building Recording exercise to a defined level, and it needs a suitably qualified author rather than a phone and an afternoon.

Asbestos and the separate duties involved

Most farm buildings put up between the 1950s and the mid-1980s have asbestos cement somewhere: roof sheets, gutters, flue pipes, water tanks, partitions.

The Control of Asbestos Regulations 2012 apply to the work regardless of planning. A refurbishment and demolition survey is needed before the work starts, so the contractor knows what is there. Asbestos cement removal is usually non-licensed work, but it still requires trained operatives, controlled removal methods and, in some circumstances, notification. Breaking sheets with a telehandler is not a method.

The waste is hazardous waste. It must go to a site licensed to receive it, under a consignment note that you keep. Burning it, burying it or tipping it into a farm hollow are each separate offences, and the enforcement route is environmental rather than planning.

Where the demolition is part of a larger redevelopment, a Pre-redevelopment Audit sets out what is in the building and what can be reclaimed, which helps both the waste figures and the case for reuse of materials.

Protected species before the machine arrives

Barns are habitat. Bat roosts, barn owl nest sites and nesting birds are all common in redundant farm buildings, and all are protected by law independently of planning.

A preliminary roost assessment is the first step, and the timing matters because emergence surveys can only be done between May and September. Finding a roost does not stop the work, but it moves it into licensing territory under the Conservation of Habitats and Species Regulations 2017, with a licence application prepared by a licensed ecologist and a mitigation scheme that usually involves providing replacement roosting features. A licensed ecologist is legally required for this work, and an AI-drafted report is a starting point for that professional rather than a substitute for the survey.

Nesting birds are a seasonal constraint between March and August. Barn owls can nest outside that window and are given additional protection at the nest.

Plan the survey season a year ahead if you can. The alternative is a demolition programme built around a bat licence applied for in October, which is the sort of delay that costs more than the demolition.

Effect on later conversion rights

This is the section to read twice.

Class Q of Part 3 permits the change of use of an agricultural building to a dwellinghouse, with building works reasonably necessary for the conversion. It requires a building that was in agricultural use as part of an established agricultural unit on the qualifying date set in the Order. Demolish the building and there is nothing to convert, no qualifying use to point to, and no prior approval application to make.

Class R works the same way for flexible commercial uses. So does the policy argument for conversion to a workshop or office, which is why farm diversification into workshops and offices almost always starts from an existing structure.

Replacing the building is not a free move either. A new agricultural building may be permitted development under Part 6, subject to the unit size thresholds, the floor area limit and prior notification, but a new building for any other purpose needs planning permission in open countryside, with the design and landscape case to go with it.

Before demolishing anything, write down what the building could be worth as a conversion. If the answer is a dwelling or a commercial unit, get the prior approval first and demolish afterwards, or not at all.

Site restoration after removal

Leaving a concrete pad and a ring of hardcore where a building stood creates two problems. It reads as a development platform to a planning officer, which complicates any future application, and it counts as previously developed land in some arguments and not in others.

Decide deliberately. If you want the site back in agriculture, break out the slab, remove the hardcore and reinstate soil profiles, and record it. If you want to keep the hardstanding for machinery, be aware that the surface itself may need permission depending on scale and location, and that it will be visible on the next aerial survey.

Hedges and boundary features around a redundant building often go at the same time without anyone thinking about it. That is a separate regime, and the test applied is set out in hedgerow removal notices and the important hedgerow test.

Records worth keeping

Six things, filed together, answer almost every question anyone asks later.

1. Dated photographs of the building inside and out, before and after.
2. The prior approval determination or the council's written confirmation that none was needed.
3. Evidence of the agricultural use at the time of demolition, including subsidy records and dated imagery.
4. The asbestos survey, the removal method statement and the hazardous waste consignment notes.
5. The ecology report and any licence, with the mitigation sign-off.
6. A measured plan of the footprint, tied to a datum.

For a wider redevelopment, a Planning Statement that sets out the demolition, the restoration and the planning history is the document that ties those records together. To see which reports an application on your holding is likely to need, enter your postcode on PlanScope and work through the guided questions.

This is general guidance, not legal advice. Check the position with your local planning authority or a qualified professional before relying on it. For specialist technical reports, qualified professional input may be required. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.