Discharging an archaeological condition: the written scheme

An archaeological planning condition is discharged in stages, and the first stage is a written scheme of investigation approved in writing by the local planning authority before development starts. The scheme sets out what will be done, by whom, to what standard and on what timetable. Everything that follows, from fieldwork through post-excavation analysis to archive deposition, is measured against it, and the condition is not fully discharged until the last of those is complete.

That final stage is where projects get stuck. Fieldwork finishes, the site is sold or occupied, and the archive sits in boxes with no museum willing to take it and no budget left to pay for analysis.

What the condition usually requires

The standard form has three limbs, and they are triggered at different points.

1. No development until a written scheme of investigation has been submitted to and approved in writing by the authority.
2. The development to be carried out in accordance with the approved scheme.
3. No occupation, or no development beyond a defined stage, until the site investigation and post-excavation work have been completed in accordance with the approved scheme, and provision made for analysis, publication, dissemination and archive deposition.

Read your own condition rather than assuming this wording. Some authorities split the scheme into evaluation and mitigation stages with separate approvals. Some tie the final limb to occupation, others to the sale of the final unit, and the difference decides whether an unresolved archive blocks a handover.

What goes into a written scheme of investigation

A scheme that gets approved first time covers the following, and an archaeological contractor will produce it against the curator's brief.

• The site, its boundaries, and the development proposed, with drawings
• Archaeological and historical background drawn from the Historic Environment Record and the Archaeological Desk-Based Assessment
• Aims and objectives, referenced to the relevant regional research framework
• Methodology: trench positions or watching brief scope, machine and hand excavation, recording systems, survey control
• Environmental sampling strategy, with sample sizes and processing arrangements
• Finds strategy, including conservation, storage and any specialist analysis anticipated
• Staffing, with named roles and the competence of the project officer
• Health, safety and welfare arrangements, and any constraints on access
• Monitoring arrangements, including curator site visits and notice periods
• Post-excavation programme, publication route and archive arrangements
• Timetable, and a contingency for expanding work if something is found

The contingency clause earns its place on every project. Without an agreed mechanism for what happens when a trench produces more than expected, fieldwork stops while three parties exchange emails, and the machine stands.

Who approves it and how long it takes

The local planning authority approves the scheme, acting on the advice of its archaeological adviser, which in two tier areas is usually the county archaeologist and in unitary areas may be an in-house or contracted specialist.

Submit it as a formal application for approval of details reserved by condition. A fee is payable per request, at a lower rate for applications relating to an existing dwellinghouse, and the authority has eight weeks to determine it. Deemed discharge provisions exist for some conditions with exclusions, so check whether they apply to yours rather than assuming.

In practice the specialist reads the scheme in days and the administrative process takes weeks. Get the contractor talking to the curator before formal submission, because a scheme agreed informally clears the formal stage without a round of revisions.

Fieldwork, monitoring and sign off

Once approved, the scheme is the specification. Departures from it need agreement in writing, and a verbal agreement on site with a curator who is not the decision maker is worth very little six months later.

Build in monitoring visits with the notice period the scheme specifies, and keep a site record of each visit and what was agreed. Where the works involve a standing building rather than open ground, the parallel exercise is historic building recording, which has its own levels and its own deliverables.

Sign off of the fieldwork stage is not the end of the condition. It is the point at which the post-excavation programme starts.

One practical point about variations. Where a discovery means the approved methodology no longer fits, agree a written variation with the curator and copy it to the case officer, so that the authority's file shows the departure was authorised. A development carried out in a way that departs from the approved scheme without that record is, on the face of the condition, in breach, and the point surfaces when the final limb comes to be discharged years later.

Post-excavation assessment and publication

After fieldwork comes an assessment report, which reviews what was recovered and proposes what needs full analysis. From that follows an updated project design, the analysis itself, and publication, whether as a journal article, a monograph or a report lodged in the national record.

None of that is quick, and none of it is free. The sequence and its cost drivers are set out in more detail under post-excavation assessment, archive and publication. For programming purposes, treat the post-excavation stage as running in months rather than weeks and as starting only once the specialists have material to work with.

Archive deposition and museum agreements

The archive is the part that stops conditions being discharged. Museums with collecting policies covering the area have finite storage, and many now charge deposition fees per box, require material to be prepared to a specified standard, or decline material outright.

Contact the receiving museum before fieldwork starts and obtain an accession number where the museum issues them. Get the deposition terms and the charge in writing, confirm the standard the archive must be prepared to, and confirm the arrangements for the digital archive with an accredited repository. Where no museum will take the material, raise it with the curator early, because the fallback arrangements need agreeing rather than inventing at the end.

Partial discharge and phased development

On a phased scheme, ask for the condition to be worded to allow discharge by phase from the outset. Retro-fitting phasing into a condition drafted for a single site is possible and slow.

Where the condition already exists in unphased form, a section 73 application to vary it is sometimes the cleanest route, and the authority is usually receptive where the phasing reflects a genuine construction programme. Set out the proposed phasing in the written scheme so the curator can see how the archaeological work maps onto the build sequence.

Phasing also affects the archive. Material recovered from an early phase can be assessed, analysed and deposited while later phases are still being built, which spreads the cost and reduces the risk of everything arriving at the museum at once. Say so in the scheme, because a curator who can see the archive being handled progressively is more willing to agree discharge by phase.

Reducing the programme risk

Four habits make the difference. Appoint the archaeological contractor before the application is determined, so the scheme can be drafted while the decision is pending. Agree the contingency mechanism and who authorises additional work. Secure the museum arrangement before fieldwork. And hold the post-excavation and archive budget separately from the fieldwork budget, so it survives the point where the site looks finished.

Set the archaeological position out clearly in the Heritage Statement submitted with the application, because a condition drafted against a well evidenced statement is usually a condition that can be discharged in stages rather than one that blocks occupation.

This is general guidance, not legal advice. Check the requirement with your local planning authority and its archaeological adviser 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. For specialist technical reports, qualified professional input may be required.