Building recording or archaeological field evaluation
One records what you are about to lose, the other tells you what is buried before the council decides. The triggers, the timing and who is competent to do each.
Historic building recording and archaeological field evaluation get bundled together in officers' conversations, and they are different exercises with different triggers, different practitioners and different timing. Recording captures standing historic fabric before it is altered or demolished, to a level set by Historic England's guidance. Field evaluation investigates what is buried, by trenching, geophysics or test pits, under a written scheme of investigation agreed with the council's archaeological adviser. One produces a record of something you are about to lose. The other tells you what is there before the council decides your application.
For a developer the practical difference is where each lands in the programme, and only one of them can hold up a decision.
What building recording captures
Historic England's guidance on recording practice defines four levels, and the condition on your permission will name one.
| Level | What it involves |
|---|---|
| Level 1 | A basic visual record, essentially photographic, used for rapid identification or as part of a wider survey |
| Level 2 | A descriptive record covering the building's form, function and development, with photographs and a written account |
| Level 3 | An analytical record of the building as it survives, with measured drawings, systematic photography and a written analysis of its development |
| Level 4 | A full analytical record including documentary research setting the building in its wider historical context |
Most conditions on conversions and demolitions specify Level 2 or Level 3. Level 4 is reserved for buildings of real importance, usually listed and usually being substantially altered.
The level matters commercially. Level 3 requires measured survey and structured photography, so it needs access, scaffolding in some cases, and a building stripped enough to see the fabric but not yet demolished. That is a narrow window and it has to be in the programme. A historic building recording drafted to the right level and structure gives the specialist a head start, though the survey itself has to be done by a suitably qualified author and professional review is strongly advised.
What field evaluation investigates
Field evaluation is about buried remains. It follows a desk-based assessment that has identified potential, and it tests that potential on the ground.
The usual methods are geophysical survey, trial trenching, test pitting, borehole and auger survey, and fieldwalking on ploughed land. Which applies depends on geology, land use and the kind of remains anticipated, and the choice is made in the written scheme of investigation rather than by the contractor on the day.
The whole exercise runs under a scheme approved by the county archaeologist or the authority's heritage adviser, and the results are deposited with the Historic Environment Record. Trenching percentages, sampling strategy and reporting format are all set in advance.
Where the desk-based work finds nothing and the setting is well understood, evaluation may not be required at all. That is what an archaeological desk-based assessment is for, and running it early is the least costly way to find out.
Standing fabric against buried remains
The distinction sounds obvious and blurs on real sites.
A nineteenth century mill complex has standing buildings that need recording and yards that may contain earlier foundations. A farmstead has barns worth a Level 3 record and a moat that needs evaluation. A church hall may have nothing buried at all and a roof structure of real interest.
The trigger is different in each case. Recording is triggered by loss of or alteration to the historic fabric itself, whether or not the building is listed. Evaluation is triggered by the archaeological potential of the ground, which the Historic Environment Record and the desk-based assessment establish.
So a site can need one, the other, both, or neither, and the answer is not predictable from the age of the building.
Timing relative to demolition and groundworks
This is where the two diverge most sharply.
National policy expects that where a site includes or has the potential to include heritage assets with archaeological interest, the applicant submits a desk-based assessment and, where necessary, a field evaluation, before the application is determined. So evaluation is frequently a pre-determination requirement. It has to be programmed into the pre-application period, and it needs land access, weather, and an approved scheme before anyone puts a machine on the ground.
Recording is usually secured by condition and carried out after permission, before or during the works. The condition will require the scheme to be approved first, the record to be completed before the building is altered, and the archive to be deposited.
There are exceptions in both directions. Where a building's significance is disputed and its demolition is central to the application, the authority may want a Level 3 record and a statement of significance before determination. Where the archaeology is well understood and the risk is low, evaluation may be deferred to a condition. Our note on evaluation before or after determination covers how that call is made.
Do not assume deferral. A pre-determination evaluation discovered late can cost a season.
Who is competent to carry out each
Neither is a legally reserved activity, but both are strongly governed by professional standards, and councils will name them.
For archaeology, expect the authority to require a practice that is a registered organisation with the relevant professional institute, working to published standards for field evaluation, with an approved scheme and a named project manager. Submitting a report from an unregistered contractor is a reliable way to have the condition refused discharge.
For building recording, the practitioner needs to be able to produce measured drawings and analytical text to the specified level. Some archaeological practices do this well. Some historic buildings consultants do it better. Ask to see a recent report at the same level before appointing.
In both cases PlanScope's draft is a starting point for the specialist who will sign the work, not a substitute for the fieldwork. For specialist technical reports, qualified professional input may be required.
Conditions and archive deposition
Both exercises end with an archive, and both conditions usually require it.
A recording condition will require the record to be deposited with the local Historic Environment Record, often with a copy to a local archive or library, and sometimes with a published summary. An evaluation condition, and any subsequent mitigation condition, will require an online index entry, deposition of the site archive with a museum that accepts it, and a report within a stated period.
Museum deposition is worth checking early. Some museums have closed to new archaeological archives, and where that is the case the scheme has to name an alternative, which the adviser must accept.
Where both apply on one site
Sequence them. Desk-based assessment first, because it scopes everything else. Field evaluation next, before determination if the adviser asks for it. Recording after permission, before demolition, with the building accessible and the scaffolding programme aligned.
Where demolition in a conservation area is involved, the consent regime adds another layer, which we set out in the note on demolition in a conservation area.
Then build both into the contract. The most expensive version of this is a contractor on site, a condition undischarged, and an archaeologist who cannot mobilise for six weeks. An archaeological field evaluation booked at the right point in the programme costs a fraction of the same work booked in a hurry.
PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.
Frequently asked questions
What are Historic England recording levels 1 to 4?
Level 1 is a basic visual record, largely photographic. Level 2 is a descriptive record of form, function and development. Level 3 is an analytical record of the building as it survives, with measured drawings and systematic photography. Level 4 adds documentary research placing the building in its wider historical context. Conditions usually specify Level 2 or Level 3.
Does archaeological evaluation have to happen before determination?
Often yes. National policy expects a desk-based assessment and, where necessary, a field evaluation to be submitted before the application is determined where the site has archaeological potential. Some authorities defer evaluation to a condition where the risk is low, but that is a judgement for the archaeological adviser, not an entitlement.
Does building recording apply to unlisted buildings?
Yes. The trigger is loss of or alteration to historic fabric of interest, not listed status. Recording conditions are commonly attached to permissions for the conversion or demolition of unlisted farm buildings, industrial premises and locally listed buildings, particularly in conservation areas.
Who can carry out an archaeological field evaluation?
Councils usually require a practice registered with the relevant professional institute, working to published standards for field evaluation under a written scheme of investigation approved in advance. A report from an unregistered contractor will commonly be refused when the condition comes to be discharged, which wastes both the fee and the programme.
What happens to the archive afterwards?
Both exercises end with deposition. Recording archives go to the local Historic Environment Record, often with a copy to a local archive. Evaluation archives require an online index entry and deposition with a museum that accepts archaeological material. Check museum capacity early, because some have closed to new deposits.
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.