Historic Environment Record searches: what to ask for
The value of an HER search depends on how the request is worded. Monuments alone tell you little; events, findspots and grey literature tell you what has been looked at.
A Historic Environment Record search is the data foundation for any archaeological desk-based assessment, and the quality of what you get back depends almost entirely on how the request is worded. Ask for "any archaeology within 500 metres" and you will receive a list of monuments. Ask properly and you will receive the monuments, the previous interventions, the findspots, the unpublished reports and the historic landscape characterisation, which together tell you something useful.
The difference costs nothing. It is a matter of knowing what the record holds.
What the record holds and who maintains it
A Historic Environment Record is a database of the known historic environment for a defined area, maintained by a county council, a unitary authority, a national park authority or, in Greater London, by Historic England. Each one is compiled and curated locally, so structure, coverage and search interfaces vary.
The record is distinct from the national list of designated assets. Listed buildings, scheduled monuments, registered parks and gardens, registered battlefields and protected wrecks are designated nationally and published on the national heritage list. The Historic Environment Record includes those but its real value is everything else: the undesignated sites, the cropmarks, the earthworks, the industrial remains, the find scatters and the record of what has already been dug.
Most records also hold historic landscape characterisation data, historic map transcriptions, aerial photograph interpretation results where a national mapping programme has covered the area, and, increasingly, digitised historic maps.
Defining a proportionate search radius
There is no fixed radius and asking for one is the wrong instinct. Set the study area from the proposal.
For a small infill site with no setting issues, a radius of around 500 metres captures the immediate context. For a larger site, or where the surrounding archaeology is poorly understood, a kilometre is the usual working figure. Where setting of designated assets is in play, or where the scheme is tall or visually prominent, the study area has to extend to whatever distance the setting argument reaches, which can be several kilometres.
Two refinements worth asking for.
A wider radius for designated assets only, alongside a tighter radius for everything else. That keeps the volume manageable while catching the scheduled monument two kilometres away that a setting assessment will need.
Extension along a relevant feature. If the site sits on a river terrace, a Roman road or a former railway, ask for the search to follow that feature beyond the general radius, because archaeological distributions follow topography rather than circles.
Monuments, events and findspots
Three record types, and the distinction between them is the thing most requests miss.
Monuments are known sites: a moated site, a deserted settlement, a limekiln, a pillbox, a cropmark enclosure. Each carries a period, a description, a source and usually a confidence level.
Events are interventions. Evaluations, excavations, watching briefs, geophysical surveys, field walking. This is the record type that tells you what has actually been looked at, and it is at least as valuable as the monument data. A negative watching brief across the field next door is evidence, and so is the absence of any event within a kilometre.
Findspots are recorded objects, often from metal detecting or field walking, frequently reported through the national finds recording scheme. A concentration of finds with no associated monument is a strong indicator of something undetected.
Ask for all three explicitly, with their source references and the dates of each record, because the age of a record tells you how much weight it can carry.
Grey literature and unpublished reports
Most archaeological work in England is developer funded and reported in unpublished client reports. Those reports sit with the record as grey literature, and they are where the detail lives: the trench plans, the deposit descriptions, the negative results.
Request the grey literature relating to events in the study area, not only the event summaries. A one line summary saying "no archaeological features recorded" reads very differently once you see that the evaluation was two trenches on a four hectare site.
Many reports are also indexed nationally through the online index of archaeological investigations, which is worth searching in parallel because indexing practice varies between records.
Fees, timescales and data licensing
Most records charge for commercial searches, usually on a banded scale by study area size or by the purpose of the request. Some offer a free service for students and community groups and charge only commercial users. Some provide the data as a report, others as a spreadsheet and a set of spatial files.
Turnaround is typically a small number of weeks rather than days, and it lengthens in busy periods and around holidays. Build that into the programme, because a desk-based assessment cannot start without it and a pre-application meeting without one is a meeting spent guessing.
Licensing is the part architects overlook. Data is supplied under terms that usually restrict reuse to the named project, require acknowledgement, and prohibit onward supply. Base mapping supplied with it carries its own licensing. Read the terms before dropping the data into a document that will be published on a planning portal.
| Ask for | Why |
|---|---|
| Monuments, events and findspots as separate datasets | Each answers a different question |
| Source references and record dates | Shows how current and how reliable each entry is |
| Grey literature reports for events in the area | Summaries hide the trench counts and the sampling |
| Spatial data files as well as a report | Lets you plot the data against your site plan |
| Historic landscape characterisation for the area | Frames the site in its wider pattern |
| Any historic map transcriptions held | Saves duplicating research you have already paid for |
Using the results in a desk-based assessment
The search is data, not assessment. What turns it into a desk-based assessment is the interpretation: the archaeological and historical background, a statement of the known and potential resource, an assessment of the importance of what may be present, and an evaluation of the impact of the proposal.
The professional standard for that work is published by the chartered institute for archaeologists and councils expect authors who work to it. An archaeological desk-based assessment is a report type where a suitably qualified author is expected, and professional review is strongly advised.
Two habits improve the output. Plot everything on one figure at a usable scale, with the site boundary and the study area shown, so the distribution can be read rather than described. And write a short paragraph on potential by period, saying what might be present and why, rather than listing what is recorded and stopping.
Gaps in the record and what they mean
This is the sentence that belongs in every assessment: absence of records is not evidence of absence.
A record reflects what has been reported. Areas that have been developed, ploughed, flown over or walked by an active local society are densely recorded. Pasture, woodland and land in single ownership for a long period often are not.
Digitisation is uneven too. Older paper records, antiquarian references and site archives are not always fully entered, and some records hold material that only surfaces when a curator is asked a direct question. It is worth a phone call.
Where the search returns little, the honest conclusion is usually that the potential is unknown rather than low, and the next step is evaluation rather than a statement that nothing is there. County archaeological advisers respond well to that framing and badly to the alternative.
This work sits early in the process, alongside the other constraint checks made before an offer, and it feeds directly into the heritage statement where built heritage is also affected.
This is general guidance, not legal advice; check the position with your local planning authority or a qualified professional before relying on it. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.
Frequently asked questions
Who maintains the Historic Environment Record?
A county council, unitary authority or national park authority for most of England, and Historic England for Greater London. Each record is curated locally, so structure, coverage and search interfaces differ. It is separate from the national list of designated assets, though it usually includes them alongside the undesignated sites that are its real value.
What search radius should I ask for?
Set it from the proposal rather than from habit. Around 500 metres suits a small infill site, a kilometre is the usual working figure for larger sites, and setting assessments may need several kilometres. Ask for a wider radius covering designated assets only, and extend the search along rivers, roads or ridges where relevant.
Why do previous interventions matter so much?
Because they tell you what has actually been looked at. A negative watching brief on the adjoining field is evidence, and so is the absence of any recorded intervention within a kilometre. Monument records tell you what is known to be there. Event records tell you how much of the area has been tested at all.
What is grey literature and why request it?
Unpublished reports from developer funded archaeological work, held with the record. They contain the trench plans, deposit descriptions and negative results that a one line event summary hides. A summary saying no features were recorded reads differently once you see the evaluation was two trenches across four hectares.
Does an empty search mean the site is clear?
No. A record holds what has been reported, so areas that have been developed, ploughed or walked by an active local society are densely recorded while pasture and woodland often are not. Where a search returns little, the honest conclusion is that potential is unknown, and evaluation is the next step.
Sources and further reading
This article is general guidance about the planning system in England and, where stated, the rest of the UK. It is not legal or professional advice. Check your local planning authority’s validation requirements and take professional advice for your specific site.