Archaeological work and registered organisation status
The curatorial archaeologist sets the brief and approves the method. Knowing how that works, and which questions to ask a contractor, keeps the condition dischargeable.
Archaeological work on a planning application is controlled by two people you may never meet: the curatorial archaeologist advising the council, who sets the brief and approves the method, and the contractor who does the work to that method. Archaeologist qualifications in planning therefore matter twice over, because the curator will only approve a written scheme of investigation from an organisation whose standards they trust, and because the resulting report has to stand up when the condition comes to be discharged.
What the county archaeologist expects
Most local planning authorities take archaeological advice from a curatorial service, often based at the county council or, in London, from a specialist team. That adviser holds the Historic Environment Record and reads every application that touches it.
Their expectation follows a standard sequence. Assess what is known, evaluate what is not, mitigate what will be lost, then report and archive. Skipping a step is what causes conditions to sit undischarged for months.
For most sites the first step is a desk-based assessment. The adviser will want it to use the Historic Environment Record itself, historic mapping, geotechnical and borehole data, aerial photography and previous investigations nearby, and to reach a view on the likely presence, character and preservation of remains rather than listing sources.
Where that view is uncertain, field evaluation follows, usually geophysical survey, trial trenching or both. The Archaeological Desk-Based Assessment is the document that decides whether evaluation is needed, and a weak one buys you a trenching requirement you might have avoided.
Registered organisation status and what it means
The Chartered Institute for Archaeologists operates a registration scheme for organisations as well as accrediting individuals. A registered organisation has been inspected against the Institute's standards, has a quality management system, and is subject to a complaints procedure.
Individuals hold graded membership, with the higher grades reflecting assessed responsibility and experience. A field team will contain a mix of grades, which is normal. What matters is who takes professional responsibility for the project and signs the report.
Curators are not obliged to insist on registration, and some do not. Many will, and many local validation lists or condition wordings refer to an appropriately qualified or accredited organisation. Check the wording before appointing, because appointing a contractor whose work the curator will not accept is an expensive error to unwind.
The detail of the registration scheme itself is covered in archaeological competence and registration.
The written scheme of investigation and who approves it
The written scheme of investigation is the controlling document. It describes the aims, the methodology, the staffing, the recording system, the sampling strategy, the post-excavation programme, the archive arrangements and the reporting timetable.
It is written by the contractor and approved by the curator on behalf of the local planning authority, and the usual condition wording requires that approval in writing before development begins.
Three points are worth knowing before you start.
The curator issues a brief or specification first on many projects, and the scheme has to answer it. A scheme written without the brief will be returned.
Approval takes time. Curatorial teams are small and turnaround of several weeks is common, so this belongs in the programme rather than in the week before you want to start on site.
And the scheme binds you. Changing the trench positions, the sampling strategy or the specialist list afterwards needs the curator's agreement. What gets approved in a written scheme of investigation covers the content in more detail.
Desk-based assessment against field evaluation
| Desk-based assessment | Field evaluation | |
|---|---|---|
| Question answered | What is likely to be present and how significant | What is actually present, and where |
| Method | Historic Environment Record, maps, borehole data, previous work | Geophysics, trial trenching, test pits, augering |
| Timing | Pre-application, informing the design | Usually pre-determination on sensitive sites |
| Approval needed | None, though the curator will read it | Written scheme of investigation approved first |
| Output | Assessment of significance and recommendation | Report on deposits, with mitigation recommendations |
National policy expects the significance of heritage assets with archaeological interest to be understood before an application is determined, which is why curators increasingly ask for evaluation before determination rather than by condition. On a large or sensitive site, assume pre-determination evaluation and programme for it. The Archaeological Field Evaluation is where that work is set out.
Questions to ask before instructing
Five questions sort contractors quickly.
- Have you worked in this county, and do you know the curator who will advise on this application.
- Is your organisation registered, and who will take professional responsibility for the report.
- What is your current lead time for fieldwork, and for the post-excavation report.
- Which museum will accept the archive, and have you confirmed that they are accepting deposits.
- What happens to the programme if something substantial is found.
Question four catches people out. Some museums have closed to new archaeological archives, and the deposition arrangement has to be resolved before the work starts rather than discovered two years later when the condition cannot be discharged.
Question five deserves an honest answer rather than reassurance. A substantial discovery means extended excavation, specialist analysis and, occasionally, a redesign to preserve remains in situ.
Programming evaluation into a build sequence
Archaeological fieldwork is weather-dependent and machine-dependent, and it needs the site cleared and accessible. On a live development that means coordinating with demolition, service diversions and ground investigation.
Trial trenching and geotechnical investigation can often share a mobilisation, which saves money and reduces the number of times the site is opened up. Say so in the brief.
Where mitigation excavation is required, it sits between site clearance and groundworks, and it cannot be compressed by adding people beyond a point. Build a realistic period into the programme and keep a contingency.
Publication and archive obligations
The work is not finished when the site is backfilled. The condition usually requires the post-excavation assessment, analysis, reporting, publication where appropriate, and deposition of the archive with a receiving museum.
Publication means a report placed where other researchers can find it, which on most sites means a summary in a county journal and a record in the national index of investigations. Grey literature reports are also deposited and indexed.
The reporting timetable is usually fixed in the written scheme of investigation, and it is worth reading before you sign it. A commitment to submit the post-excavation assessment within six months of the end of fieldwork is normal. A commitment to full publication within a year on a site that produced a complex sequence is optimistic, and a curator will remember it.
One further point on finds. Ownership of finds is a separate legal question from the archive arrangement, and treasure is dealt with under its own statutory process. Settle the position on finds ownership with the landowner in the contract rather than after something turns up.
Budget for it separately. Post-excavation and archive costs are routinely underestimated, and an unpaid specialist report is the most common reason an archaeological condition remains undischarged years after the building is occupied.
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 approves an archaeological written scheme of investigation?
The curatorial archaeologist advising the local planning authority, usually based at the county council or a specialist team, approves it in writing on the authority's behalf. Conditions typically require that approval before development begins. Approval commonly takes several weeks, so it belongs in the programme rather than the week before you want to start.
Does my archaeologist have to be a registered organisation?
Not always, but many curators and many condition wordings refer to an appropriately qualified or accredited organisation, and registration is the usual way that is evidenced. Registration means the organisation has been inspected against the Institute's standards and is subject to a complaints procedure. Check the condition wording before appointing anyone.
When is trial trenching required instead of a desk study?
Where the desk-based assessment cannot resolve the likely presence, character or preservation of remains. National policy expects the significance of assets with archaeological interest to be understood before determination, so on sensitive or large sites curators increasingly ask for evaluation pre-determination rather than leaving it to a condition.
What happens if something substantial is found?
The fieldwork extends, specialist analysis is commissioned and in some cases the design is altered to preserve remains in situ. Ask any contractor at tender stage how they would handle it and what it would mean for the programme. An honest answer at that point is far more useful than reassurance.
Why do archaeological conditions stay undischarged?
Most often because the post-excavation work was not budgeted for. Analysis, specialist reports, publication and deposition of the archive with a receiving museum all follow the fieldwork and all cost money. Some museums have closed to new archaeological archives, so confirm the deposition arrangement before the work starts.
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.