Non-designated heritage assets and their real weight

The weight a non designated heritage asset carries is the most misunderstood point in everyday heritage casework. Applicants treat it as nothing. Objectors treat it as a listing by another name. Both are wrong, and the officer has to find the position in between using a test that gives them almost no structure to work with.

National policy requires a balanced judgement having regard to the scale of any harm or loss and the significance of the asset. That is the whole test. There is no statutory duty, no presumption in favour of conservation, and no substantial or less than substantial framework. Just a balance, and whatever evidence the parties put in front of the decision maker.

What makes something a non-designated heritage asset

The Planning Practice Guidance describes non designated heritage assets as buildings, monuments, sites, places, areas or landscapes identified as having a degree of heritage significance meriting consideration in planning decisions, but which are not formally designated.

Three features follow from that definition. Identification can happen at any point, including during the determination of an application. The category covers far more than buildings. And significance is the qualifying criterion, so an old building with no surviving interest is not an asset simply by virtue of its age.

Archaeological assets are a partial exception. Where a non designated archaeological site is of demonstrably equivalent significance to a scheduled monument, national policy directs that it should be considered subject to the policies for designated assets. That is a considerable step up in protection and it turns on the quality of the evidence rather than on any list.

How assets get onto a local list

Local heritage lists are compiled by local planning authorities, often with community nomination and a panel applying published selection criteria. Historic England's advice on local heritage listing sets out how the process should work, and most authorities that have done it properly publish both the criteria and the reasons for each entry.

That publication matters more than the listing itself. An entry with a paragraph explaining what is of interest gives the officer something to weigh. An entry consisting of an address and a photograph gives them a name on a list.

Adoption route affects weight too. A list adopted as part of the local plan or a supplementary planning document, after consultation, carries more than one assembled by an internal exercise and posted on a webpage. Where a scheme turns on this, look at how the list was made and when it was last reviewed.

Assets that are not on any list

Nothing in policy requires an asset to be listed locally before it counts, and this is where applicants get caught out.

A council can identify a building as a non designated heritage asset in the officer's report on your application, on the basis of a consultee response or an objection. It happens most often with interwar and postwar buildings, industrial structures, boundary walls, milestones, chapels and farm buildings, and with locally distinctive groups where no individual element is remarkable.

The practical defence is to get there first. Where a building on the site has any age or local interest, address it in the Heritage Statement whether or not it appears on a list. A short, honest assessment concluding limited significance is far stronger than silence followed by a late objection you have to answer in a rush.

The balanced judgement and how it differs

For a designated asset, national policy requires great weight to be given to its conservation and sets up the substantial and less than substantial harm framework with its public benefits balance. None of that applies to a non designated asset.

The balanced judgement has two inputs: the scale of harm or loss, and the significance of the asset. Total demolition of an asset of real local interest sits at one end. A rear extension to a building of modest interest sits at the other. The officer weighs it against the benefits of the scheme in the ordinary planning balance under section 38(6) of the Planning and Compulsory Purchase Act 2004.

Two practical consequences. There is no threshold that has to be crossed before permission can be granted, so schemes involving total loss do get permitted. And because the test is unstructured, the quality of the evidence does more work here than in almost any other area of heritage practice.

Some local plans add their own policy for non designated assets, occasionally with wording stronger than the national test. Read the development plan before assuming the national position governs, because section 38(6) gives the plan primacy.

Establishing significance with evidence

Significance is assessed through the same heritage values used for designated assets: evidential, historical, aesthetic and communal interest. Apply them explicitly and the assessment becomes reviewable rather than impressionistic.

The evidence base for a local asset is usually thinner than for a listed building, so the research matters more. Historic Environment Record entries, tithe and enclosure maps, Ordnance Survey editions, trade directories, census returns, estate and deposited plans, aerial photographs and the building fabric itself. For an industrial or agricultural building, the surviving plant, structural system and layout often carry the interest rather than the elevations.

Where interest has been eroded, say so with specifics. Replacement windows, a rebuilt frontage, the loss of the original roof structure, a plan form no longer legible. Each is a fact a reader can check, which is what distinguishes an assessment from an assertion.

Communal value is the one applicants habitually underestimate. A building with no architectural merit that served as a works canteen for four generations can carry real communal interest, and a report that dismisses it in a clause will be answered by twenty objections that do not.

Where loss has been accepted

Total loss of a non designated asset is permitted regularly, and the cases where it succeeds share features worth recognising.

Structural condition, evidenced by a survey rather than asserted, where repair is not reasonably achievable. Significance that is modest and demonstrated to be so. A replacement scheme of evident quality that responds to what was there. Public benefits with substance behind them, such as housing delivery on an allocated site or the removal of a use causing amenity harm. And a recording condition, so the evidential value is captured before the building goes.

A Historic Building Recording to an appropriate level is the standard mitigation, and councils usually expect the specification to be agreed before works begin. Recording does not reduce the harm. It does show that the applicant has taken the interest seriously, and it is the measure officers most often condition.

Where the building has been deliberately neglected, expect that to be raised and to count against the applicant.

Arguing the weight from either side

For an applicant, the productive arguments are about the degree of significance rather than the existence of the asset. Show the alterations. Show the condition with a survey. Compare it with better examples of the same type in the locality. Offer recording and, where any element is reusable, reuse it.

For an objector or a parish council, the productive arguments are about the quality of the identification. Cite the local list entry and its reasons. Establish group value where the interest lies in the row rather than the building. Produce documentary evidence of communal association. And press on whether retention was ever properly tested.

What persuades nobody is adjectives. The word "iconic" in a heritage objection and the word "unremarkable" in a heritage statement do the same job, which is none.

Related designations behave differently and are worth checking together, as set out in the notes on what conservation area designation changes for a house and on non-statutory designations that still stop schemes.

Enter your postcode on PlanScope to see which heritage documents a site is likely to need. This is general guidance, not legal advice; check the position with your local planning authority or a qualified professional before relying on it.

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