Archaeology conditions: wording and discharge

Archaeology on a development site is almost always handled by condition rather than by refusal, and the standard form has three limbs: no development until a written scheme of investigation has been approved, the fieldwork carried out in accordance with that scheme, and the site not occupied until post-excavation assessment, analysis, publication and archive deposition have been completed as the scheme provides. Each limb is discharged separately, and the first one bites before you can break ground.

That sequence is where programmes go wrong. A condition drafted so that nothing at all can happen on site until a scheme is approved in writing will stop a contractor who only wanted to put up hoarding.

Why archaeology is handled by condition

The national policy position is that applicants should describe the significance of any heritage asset affected, including the contribution made by its setting, and that where loss of an asset of archaeological interest is justified the authority should require recording and the publication of the evidence. Recording is mitigation, not permission to destroy without record.

For most sites the authority has enough information from an Archaeological Desk-Based Assessment and the county Historic Environment Record to know that remains are possible without knowing what they are. Refusing on that basis would be unreasonable. Conditioning the work is proportionate, and the six tests in the guidance on planning conditions are satisfied because the requirement is necessary, relevant, enforceable, precise and reasonable.

Scheduled monuments sit outside this. Works affecting a scheduled monument need scheduled monument consent under the Ancient Monuments and Archaeological Areas Act 1979, from the Secretary of State on Historic England's advice, and no planning condition substitutes for it.

Standard wording and what each limb requires

The three limbs do different jobs and are usually numbered as separate conditions or lettered parts.

1. No development shall take place until a written scheme of investigation has been submitted to and approved in writing by the local planning authority. The scheme sets the method, the areas, the staffing, the standards, the monitoring arrangements and the provision for analysis and archive.
2. The programme of archaeological work shall be carried out in accordance with the approved scheme. This is the limb that makes the fieldwork enforceable and it has no separate discharge application, because compliance is evidenced by the resulting reports.
3. The development shall not be occupied, or brought into use, until the site investigation and post-investigation assessment have been completed in accordance with the approved scheme, including provision for analysis, publication and dissemination of results and deposition of the archive.

The third limb is the one to read closely on a residential scheme. Tied to occupation it is workable. Tied to completion of the building it can hold up practical completion for reasons that have nothing to do with the building.

A fourth requirement sometimes appears on larger sites, requiring a programme of phased fieldwork with the authority's written agreement at each phase. That is sensible on a 20 hectare allocation and unnecessary on a single plot.

Pre-start triggers and section 100ZA

A condition that prevents development starting until something is approved is a pre-start condition, and section 100ZA of the Town and Country Planning Act 1990 means the authority cannot impose one without the applicant's written agreement. In practice the authority serves notice of the proposed condition, the applicant has a short window to respond, and silence is treated as agreement.

Use that window. It is the one moment where the trigger wording is negotiable at no cost, and the two changes worth asking for are an exception for site clearance, demolition, fencing and ground investigation, and a definition of development that does not catch works outside the areas of archaeological interest.

Staged conditions covering analysis and archive

Post-excavation is where cost and time are underestimated. After the fieldwork, the material goes through assessment, then selected analysis, then a publication report, then deposition with a museum under an accession agreement. Specialist work on environmental samples, pottery, human remains or metalwork is scheduled around specialists' availability rather than your programme.

Museums are the quiet constraint. Several county and city museums have limited or closed their archaeological collecting, and an accession agreement that cannot be obtained will stall the final limb of the condition through no fault of yours. Ask the contractor to confirm the receiving museum before fieldwork begins, and if there is none, ask the authority early what it will accept instead.

Where remains are waterlogged, the whole picture changes: sampling, conservation and storage requirements escalate quickly, and the reasons are set out in the note on waterlogged deposits and why they change the approach.

Discharging each stage in sequence

The discharge route is an application for approval of details reserved by condition, with a fee per request set by the national fee regulations and a determination period that runs like any other application. Three practical points.

Submit the written scheme of investigation as the contractor drafts it, with the authority's archaeological adviser already consulted. Most authorities rely on a county archaeologist or an in-house specialist, and that adviser will comment whether or not you have asked them first. A scheme agreed informally before submission is approved in weeks rather than months.

Then keep the evidence trail. A photographic record, the site archive index, the assessment report and the publication reference are the documents the authority will want when you come to discharge the occupation limb, often two years later when nobody on the original team is still involved.

And resolve the occupation limb before you need it. On a phased scheme, ask for discharge against the phases you intend to occupy rather than the whole site.

Programme risk if discovery is significant

An Archaeological Field Evaluation can turn up something that changes the answer. If remains are of national importance, preservation in situ becomes the policy expectation, which can mean redesigned foundations, a piling matrix instead of strip footings, raised ground levels, relocating a basement or losing plots.

Those outcomes are not the authority being awkward. They follow from the policy position that assets of the highest interest should be preserved rather than recorded. The commercial answer is to evaluate early, before the layout is fixed, so that a positive result costs you a design change rather than a redesign after permission.

Evaluation before determination is also how you avoid the worst version of this: discovery halfway through groundworks, with plant on site and a contract running.

Negotiating workable triggers

Ask for the trigger to exclude enabling works, for the restricted area to be defined on a plan, for the occupation limb rather than a completion limb, and for phasing on anything larger than a single plot. Put the request in writing during the section 100ZA notice period with a short reason for each, because a planning officer will usually accept a drafting change that keeps the archaeology intact.

Where the authority asks for the scheme before determination instead of by condition, that is often worth accepting on a sensitive site. It costs weeks at the front end and removes the pre-start risk entirely. The significance assessment that supports it belongs in your Heritage Statement rather than in a separate note.

This is general guidance, not legal advice. Archaeological work should be commissioned from a suitably qualified archaeological organisation, and councils expect the written scheme of investigation to be prepared to recognised professional standards. Check the position with your local planning authority before relying on any wording here.

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