Pre-commencement conditions and the section 100ZA duty
Section 100ZA gives applicants a say in pre-commencement conditions. Here is what counts as one, how the notice route works, and why the trigger point decides your programme.
Since 1 October 2018 a local planning authority cannot impose a pre-commencement condition on a planning permission without the applicant's written agreement to its terms, unless it has followed a prescribed notice procedure first. The duty sits in section 100ZA of the Town and Country Planning Act 1990, inserted by the Neighbourhood Planning Act 2017, with the notice procedure set out in the Town and Country Planning (Pre-commencement Conditions) Regulations 2018. This summary is as at September 2026.
For a self-builder the effect is practical rather than theoretical. When the case officer emails a draft condition schedule two weeks before the decision, you are being asked to agree to something, and you can negotiate it.
What counts as a pre-commencement condition
The statutory definition is narrower than the everyday use of the phrase. A pre-commencement condition is one that must be complied with before any building or other operation comprised in the development begins, or, where the development is a material change of use, before the change of use begins.
Two consequences follow.
Conditions requiring approval before occupation, before the building is first used, or before above ground works begin are not pre-commencement conditions in the statutory sense, and the agreement duty does not apply to them. That is exactly why officers often reword a condition rather than negotiate it.
And the duty does not apply to conditions on a grant of outline planning permission requiring the subsequent approval of reserved matters. Reserved matters conditions are outside the definition.
The agreement duty and the notice route
The default position is straightforward. The authority proposes the condition, the applicant agrees in writing to the terms, and the condition is imposed.
Where the applicant does not agree, the authority has a second route. It may serve a notice on the applicant setting out the text of the proposed condition and the reasons for it, and giving a period of not less than 10 working days for a substantive response. If the applicant does not respond substantively within that period, the authority may impose the condition without agreement.
The word substantive matters. A reply saying the applicant objects, without engaging with the terms or the reasons, is weaker than a reply proposing alternative wording and explaining why the original fails one of the tests for conditions.
Three outcomes are possible in practice: the condition is agreed as drafted, the wording is amended and agreed, or the authority refuses permission because it considers it cannot grant without the condition. Refusal is rare on householder and minor applications and it is a real possibility on complex ones.
The tests every condition has to meet
National guidance sets six tests. A condition should be necessary, relevant to planning, relevant to the development permitted, enforceable, precise, and reasonable in all other respects. The same guidance says pre-commencement conditions should only be used where the requirement is fundamental to the development being permitted at all.
Those tests are the basis for a negotiation, and they work best used specifically:
- Necessary. Would permission have to be refused without the condition? If the information could be supplied later without harm, the condition should not bite before works start.
- Precise. Can the applicant tell exactly what has to be submitted and when? A condition requiring a scheme to be agreed, with no indication of content, is imprecise.
- Enforceable. Can the authority realistically enforce it? A condition about matters outside the applicant's control usually cannot be enforced.
- Reasonable. Is the burden proportionate to the scale of the development?
On a single dwelling, a condition requiring a construction environmental management plan, a full arboricultural method statement, a detailed drainage design and material samples all before any works start is disproportionate. Say so, and propose which of them can move to a later trigger.
Why the trigger point matters so much
Getting the trigger wrong costs money in two ways.
The first is programme. Every pre-commencement condition needs a separate application to discharge it, each with a fee, and the authority has eight weeks to determine it. A permission with six pre-commencement conditions can add months before a spade goes in the ground, and the discharge applications cannot always run in parallel because one depends on another.
The second is worse. Where works begin without a condition precedent having been discharged, those works may not be lawful, and they may not amount to a valid implementation of the permission. Under the approach established in the Whitley case, operations carried out in breach of a condition precedent are not authorised by the permission. If the permission then expires because nothing lawful was done within the time limit, the developer is left with unauthorised works and no extant permission.
That is the scenario worth taking seriously on a self-build project where the time limit is approaching and the drainage details have not been signed off. A related look at what a pre-commencement condition blocks and when sets out the mechanics in more detail.
Reducing the number of conditions before the decision
The most effective tactic is to submit the information with the application so there is nothing left to condition.
| Common pre-commencement condition | What to submit up front instead |
|---|---|
| Arboricultural method statement and tree protection | A full survey and method statement with the application |
| Construction management details | A construction management plan drafted at application stage |
| Contamination investigation | A Phase 1 desk study, with Phase 2 scope agreed |
| Materials samples | A materials schedule with named products and a sample board offer |
| Drainage details | A drainage strategy with calculations and the discharge point confirmed |
| Foul drainage connection | Written confirmation from the sewerage undertaker |
A Tree Survey with root protection areas and a method statement is one of the highest-value documents to submit early, because tree conditions are almost always drafted as pre-commencement. The same is true of a Construction Management Plan on constrained sites, and a Contaminated Land Assessment at desk study level, which must be prepared by a suitably qualified and experienced person.
Where the officer's draft schedule still contains conditions you cannot live with, respond with tracked wording rather than an objection. Officers are working to a target date and a workable alternative is usually accepted.
Discharging conditions after permission
Applications to discharge conditions are made under the development management procedure order, with a fee per request. The fee is indexed, so check the current schedule rather than an older figure.
Two features are worth knowing. Several conditions can be submitted in a single request, which reduces the fee compared with separate applications. And the deemed discharge provisions in section 74A of the 1990 Act allow an applicant to serve a notice where the authority has not determined a discharge application within the relevant period, with specified categories of condition excluded from the mechanism.
Deemed discharge is a backstop rather than a plan. Its exclusions are wide, and a mortgage lender or building control body may still want to see written confirmation.
Illustrative example. A permission for a single dwelling carries five conditions triggered before the start of works, including tree protection, drainage, contamination, materials and construction management. The applicant asks the officer to move materials to before above ground works and construction management to before the start of site clearance, and submits the tree method statement during the application. Two conditions remain pre-commencement instead of five. This example is illustrative only.
What to do when the draft schedule arrives
Read every condition against the six tests. Identify which have to be pre-commencement and which could be triggered later. Reply within the response period, in writing, with alternative wording for the ones you dispute and agreement to the rest.
Then set out the remaining discharge programme before you agree, so the timetable is understood by everyone including your builder. The narrative that supports all of this belongs in the Planning Statement, which is also where the case for submitting details up front is best made.
This is general guidance, not legal advice. Check the position with your local planning authority or a qualified professional before relying on it.
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Frequently asked questions
Can a council impose a pre-commencement condition without my agreement?
Only by following the notice procedure. Section 100ZA requires the applicant's written agreement to the terms, unless the authority has served a notice setting out the proposed condition and its reasons and giving at least 10 working days for a substantive response, and the applicant has not responded within that period.
What counts as a pre-commencement condition?
One that must be complied with before any building or other operation comprised in the development begins, or before a material change of use begins. Conditions triggered before occupation, before first use, or before above ground works are outside the statutory definition, and so are reserved matters conditions on an outline permission.
What happens if I start work without discharging a condition precedent?
The works may not be authorised by the permission. Following the approach in the Whitley case, operations carried out in breach of a condition precedent are not lawful, so they may not amount to a valid implementation. If the permission then expires, you can be left with unauthorised works and nothing extant to rely on.
How do I reduce the number of pre-commencement conditions?
Submit the information with the application so there is nothing left to condition. Tree method statements, construction management plans, desk study contamination reports, materials schedules and drainage calculations are the documents that most often turn into pre-commencement conditions when they are left out.
Is deemed discharge a reliable route?
It is a backstop. Section 74A allows an applicant to serve a deemed discharge notice where the authority has not determined a discharge application in time, but the excluded categories are wide, and lenders or building control bodies may still want written confirmation from the authority. Do not plan around it.
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.