Using the Heritage Gateway to find historic environment records

The Heritage Gateway is the quickest way to see what is already recorded about a site's archaeology and historic buildings, and it is not a substitute for a formal historic environment record search. It aggregates the National Heritage List for England with a set of local historic environment records and other national datasets, so half an hour on it tells you whether the site sits in a known archaeological area, whether there are findspots or earthworks nearby, and whether anyone has dug there before. What it will not tell you is everything the county record holds, because coverage and currency vary between authorities.

Use it for screening. Commission the formal search for the assessment.

What a historic environment record holds

A historic environment record is the county or unitary authority's database of the known historic environment, maintained by an archaeological officer and used to advise on planning applications. It holds more than a list of sites.

• Monument records: earthworks, buildings, structures, cropmarks and buried remains, each with a period, a type and a grid reference.
• Findspot records: stray finds, often from metal detecting or fieldwalking, with varying location precision.
• Event records: previous archaeological investigations, from watching briefs to full excavations, with references to the reports.
• Designation records: listed buildings, scheduled monuments, registered parks and gardens, conservation areas and locally listed assets.
• Historic landscape characterisation, which describes the pattern of fields, enclosure and settlement rather than individual sites.

The event records are the ones consultants undervalue. Knowing that a watching brief 80 metres away found nothing is as useful as knowing that an excavation found a Roman ditch, and it is the kind of negative evidence that shapes a mitigation strategy.

National and local record sets available online

The Gateway searches across participating local records plus national datasets, and a parallel search of the National Heritage List for England gives the statutory designations with their list descriptions and map extents. Historic England's own archive holds the national record of the historic environment, its aerial photograph collections and reports.

Elevation data is worth adding to the same screening pass. Publicly available airborne laser survey data covers much of England and reveals earthworks that no record has captured, and it is available through the government's environmental data service. A rapid look at hillshaded elevation data alongside the record search catches the cropmark nobody plotted.

Historic mapping completes the picture, and the six-inch and 25-inch county series are the workhorses for tracing field boundaries, buildings that have gone and industrial features.

Searching by area and by period

Search geographically first, with a radius appropriate to the proposal rather than a default. For a single dwelling, 250 metres is often enough context. For a site of several hectares, a kilometre is the usual study area, extended along a valley or a ridge where the topography suggests it.

Then filter by period, and read the gaps rather than the entries. A parish with dense medieval records and nothing prehistoric is more likely to be under-recorded than actually empty, because records reflect where people have looked. Urban areas show the opposite pattern, with intense recording along redevelopment corridors and blanks where nothing has been rebuilt since the war.

Cross-check the parish boundary too. Records are often catalogued by parish, and a site near a boundary can sit in the search results of one authority while the relevant evidence is held by its neighbour. On a site straddling two counties, expect to commission two searches and to receive them in different formats.

Note the grid reference precision on each record. A findspot given to a four-figure grid reference could be anywhere in a square kilometre, and treating it as a point on your site plan will embarrass you at committee.

Where the online extract is incomplete

Be clear with yourself about the limits before you rely on the output.

Not every authority's record is available through the portal, and some that are have not been updated for years. Grey literature, meaning unpublished contractor reports, is generally not included in full, so you can see that an investigation happened without seeing what it found. Historic landscape characterisation is often absent. And the record officer's own interpretation, which is what actually informs the consultation response on your application, is not in the database at all.

There is also a data protection dimension: findspot records from private landowners are sometimes restricted, and the public view may be deliberately imprecise.

Commissioning a formal record search

For any application likely to need an Archaeological Desk-Based Assessment, commission the formal search. Contact the historic environment record for the county or unitary authority, state the site boundary and the study radius, and ask for the monument, event and designation data with the associated grey literature list.

Most records charge a fee, whether hourly or per search, and turnaround is commonly two to four weeks, which puts it on the critical path if the application is programmed tightly. Ask for the data in a spatial format so it can be plotted directly, and ask whether a list of relevant unpublished reports can be supplied alongside it.

While you are in touch, ask the record officer what they would want to see. Many will indicate whether they expect evaluation before determination or whether a condition would satisfy them, and that single answer changes the programme more than anything else in the assessment.

Using the results in a desk-based assessment

The standard to work to is the Chartered Institute for Archaeologists guidance on historic environment desk-based assessment, which expects the assessment to establish the known and potential resource, assess significance, and consider the impact of the proposal.

Structure the results rather than listing them. Group records by period, summarise what the pattern suggests about the site's potential, and state the confidence behind each conclusion. Then separate potential from significance: a site may have high potential for medieval remains of low significance, or low potential for remains of national importance, and the mitigation differs completely.

Where the assessment identifies potential that cannot be resolved from records alone, say what the next step is: geophysical survey, trial trenching, a watching brief, or a written scheme of investigation secured by condition. A heritage statement dealing with built assets sits alongside this work and should draw on the same sources rather than repeating the search independently.

Citing records correctly

Citation is where assessments look amateur. Each record should be cited with its identifier, its holding body and the date of access, because record numbering differs between counties and records are revised.

The same applies to the other sources. Give the list entry number for a designated asset, the edition and date for a historic map, the survey year for elevation data, and the author, title and year for any unpublished report. Then keep the raw data export with the project file. Two years later, when a condition is being discharged, the person doing it will want the original search rather than your summary of it.

The same discipline that keeps a constraints pack usable applies here, and the approach in building a site constraints plan from open data works for historic environment data as well. Where the screening turns up a registered designation, checking registered parks, gardens and battlefields is the next step.

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. Enter your postcode on PlanScope to see which reports your site needs.