Pre-commencement condition: what it blocks and when
A pre-commencement condition stops all development until it is discharged in writing. Here is the section 100ZA agreement rule, the discharge procedure and what happens if you start anyway.
A pre-commencement condition is a planning condition that has to be discharged before any development starts on site. Nothing at all, in most cases: not the site hoarding, not the access track, not the first spade into the topsoil. Get it wrong and the whole permission can be at risk, because works carried out in breach of a true condition precedent may not count as a lawful start. Since 2017 the council cannot simply impose one either. It has to ask the applicant in writing first.
Architects meet these conditions at two points. Once when the draft decision notice arrives with a list of things to approve, and again eighteen months later when the contractor wants to break ground and three of them are still outstanding.
What a pre-commencement condition actually is
The legal definition sits in section 100ZA(8) of the Town and Country Planning Act 1990: a condition that must be complied with before any development begins, or before a part of the development begins where that part is specified in the condition. The wording of the condition is what matters, not the heading a council puts above it. "No development shall take place until a scheme for X has been submitted to and approved in writing" is a pre-commencement condition. "The approved scheme for X shall be implemented before first occupation" is not.
Councils use them for the things they cannot assess at decision stage and cannot risk being done badly: contamination remediation strategies, archaeological written schemes of investigation, tree protection, construction management plans, ecological method statements, surface water drainage design, and the details of materials on a heritage-sensitive elevation.
The count matters as much as the content. A householder permission with two of them is normal. A minor residential scheme carrying fourteen is a programme problem, and it is easier to argue the count down before the decision is issued than to unpick it afterwards.
The six tests every condition has to pass
National policy and the Planning Practice Guidance set six tests. A condition should be necessary, relevant to planning, relevant to the development permitted, enforceable, precise, and reasonable in all other respects. All six, not a majority.
Two of them do most of the work in practice. Precision fails when a condition asks for a scheme "to be agreed" without saying what the scheme must contain or against what standard it will be judged, which leaves the discharge application open to a moving target. Necessity fails when the condition duplicates another regime: a condition requiring compliance with the Building Regulations, or with a Party Wall award, is not necessary and should not survive a challenge.
Push back at draft decision stage. Officers routinely accept a request to convert a condition from pre-commencement to pre-superstructure or pre-occupation where the risk being managed does not arise at groundworks. Ground contamination does need resolving first. External materials do not.
The written agreement requirement
Section 100ZA prohibits a local planning authority in England from granting permission subject to a pre-commencement condition without the written agreement of the applicant, unless the applicant has been given notice in the prescribed form and has failed to respond within the prescribed period. Regulations made in 2018 set out that notice, what it must contain and how long the applicant has to reply. Check the current regulations for the exact period before you rely on a deadline.
What this gives you is a short, real negotiation window. The notice sets out the text of the proposed condition and the reason for it. A reply that accepts three conditions, asks for two to be re-timed and objects to one as unnecessary is a normal response, and it costs far less than a section 73 application after the event.
Silence is not a defence. If you let the period run out without replying, the council may impose the condition anyway.
Discharging the condition
Discharge is a formal application for approval of details reserved by a condition, made under the Development Management Procedure Order 2015. It is not an email to the case officer, however helpfully the case officer responds to emails.
- Submit the details for each condition, referencing the condition number and the exact wording, and say plainly how the submitted information answers it.
- Pay the fee. It is charged per request rather than per condition, at a lower rate for householder permissions, and it is indexed annually, so take the current figure from the published fee schedule.
- Allow eight weeks. The council has that period to determine the request, and consultees such as the county archaeologist or the lead local flood authority may need part of it.
- Wait for the written approval before you start the works the condition governs.
There is a deemed discharge route in the 2015 Order for some conditions, where an applicant can serve notice and the condition is treated as discharged if the authority does not determine in time. It is narrower than people assume. Conditions relating to environmental impact assessment development, listed buildings and several other categories are excluded, so read the schedule before relying on it.
Programme the discharge applications like any other long-lead item. Archaeological and ecological conditions can carry seasonal constraints, and a survey window missed in June is a delay to the following spring.
Building before discharge
The rule most people learn the hard way comes from the Whitley line of cases: operations carried out in breach of a condition precedent are not lawful, so they do not amount to a lawful start on the development. If the permission's three-year time limit then expires, the applicant is left with an unimplemented permission and unauthorised works on the ground.
The practical consequences stack up quickly. The council can serve a breach of condition notice or an enforcement notice. A purchaser's solicitor will raise it on the title report and hold the transaction. Warranty providers and lenders ask for the discharge decisions as a matter of course. And because Community Infrastructure Levy liability is triggered by commencement, starting without serving a commencement notice can also cost the developer any instalment rights and exemptions.
Not every condition is a true condition precedent. The courts have distinguished conditions that go to the heart of the permission from those that regulate a detail, and the distinction turns on the wording and the purpose. That is legal territory, so take advice rather than assuming a technical breach is fatal.
Illustrative example: a tree protection condition
A permission for a two-storey side extension on a plot with a mature lime near the boundary carries this condition: no development shall take place until a tree protection plan and an arboricultural method statement prepared in accordance with BS 5837:2012 have been submitted to and approved in writing by the local planning authority.
Read literally, the contractor cannot bring a mini-digger onto the drive before that approval, because site set-up within the root protection area is itself development preparation the condition is designed to control. The discharge submission needs the constraints plan, the tree protection fencing specification, the position of the site compound, and a method statement for any works inside the root protection area, all of which sit naturally in an arboricultural impact assessment prepared for the application in the first place.
Two months of programme disappear when this is left to the week before the start on site. Submitting the same information with the application, and asking for the condition to be worded as a compliance condition rather than a pre-commencement one, usually avoids the problem entirely. The same logic applies to heritage details, where the officer's concern is the effect on the setting of a heritage asset rather than anything happening at foundation level.
This is general guidance, not legal advice. Check the position with your local planning authority or a qualified professional before relying on it.
Drafting the supporting documents that pre-empt these conditions is quicker than unpicking them later. Browse the report types and start a draft. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.
Frequently asked questions
Can I start groundworks while a discharge application is being determined?
No. A pre-commencement condition bars development until the details are approved in writing, and site set-up works can themselves count as a start. Works carried out in breach of a true condition precedent are unlawful and may not amount to a lawful implementation of the permission, which can leave the permission to expire unimplemented.
What does section 100ZA change?
It stops a council in England imposing a pre-commencement condition without the applicant's written agreement, unless the applicant was given notice in the prescribed form and did not respond in time. In practice it creates a short negotiation window in which conditions can be re-timed, tightened or dropped before the decision notice is issued.
How much does it cost to discharge conditions?
There is a fee per request rather than per condition, charged at a lower rate for householder permissions. The figures sit in the national fee regulations and are indexed annually, so take the current amount from the published fee schedule rather than an older article. Grouping several conditions into one request keeps the cost down.
How long does a discharge application take?
The authority has eight weeks to determine a request for approval of details reserved by condition. Consultees such as the county archaeologist, the lead local flood authority or the tree officer may need part of that period. Allow longer where a survey has a seasonal window, because a missed season can push a start on site by months.
Is deemed discharge a reliable fallback?
Only sometimes. The Development Management Procedure Order 2015 allows an applicant to serve notice and treat certain conditions as discharged if the authority fails to determine in time, but the exclusions are wide and cover categories including environmental impact assessment development and listed building matters. Read the schedule before relying on the route.
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.