Pre-commencement conditions and the cash-flow they cost

Pre-commencement conditions are the ones that have to be discharged before a spade goes in the ground, and they are the reason a permission dated in March can still be unbuildable in September. The permission is granted, the fee is paid, the drawings are approved, and the money is then sitting idle while a drainage scheme, a construction management plan and an archaeological written scheme of investigation work their way through a case officer's inbox. For a self-builder on a bridging facility, that gap is the single most expensive thing on the decision notice.

The condition text is negotiable before the decision is issued. After it, much less so.

Why these conditions bite hardest

Every planning condition costs something, but a pre-commencement condition converts a paper obligation into a hard stop. Development carried out in breach of one is not authorised by the permission, which puts the whole scheme at risk of enforcement and can invalidate the commencement for other purposes.

That matters beyond the council. Lenders release funds against a start on site. Warranty providers ask whether all conditions precedent are discharged. A groundworker booked for April who cannot start until July usually cannot be re-booked at the same price.

The conditions that cause the longest delays are the ones that need fresh evidence rather than a drawing: contamination investigation, ground gas monitoring, bat emergence surveys, a biodiversity gain plan, or an archaeological evaluation trench.

The agreement requirement before imposition

Since section 100ZA of the Town and Country Planning Act 1990 came into force, a local planning authority in England cannot grant permission subject to a pre-commencement condition without the applicant's written agreement, unless the prescribed notice procedure has been followed.

In practice the officer sends written notice of the proposed condition, its full text and the reason for it. The applicant has a short, prescribed window to respond substantively. Silence is not a defence. If you do not reply within the period, the authority can impose the condition anyway, and the room to negotiate is gone.

So the notice email that arrives in week six, often headed as a courtesy, is the most valuable message in the file. Read the text of every proposed condition and ask three things: does it have to be pre-commencement, can it be reworded to bite before a particular stage instead, and is it one of the six tests in national guidance that this condition actually meets.

Conditions must be necessary, relevant to planning, relevant to the development permitted, enforceable, precise, and reasonable in all other respects. A condition requiring a full remediation strategy before any development where only a watching brief is warranted fails the first and last of those.

What has to exist before a start

Work back from the condition text rather than from the officer's report. A typical minor residential permission will carry some combination of the following as conditions precedent.

• Surface water drainage details, often with infiltration testing that cannot be done in a wet winter
• A construction management plan covering parking, wheel washing, deliveries and hours
• Tree protection measures set out to the relevant British Standard, installed and inspected
• A contaminated land desk study, with intrusive investigation triggered if the desk study finds it necessary
• An archaeological written scheme of investigation agreed with the county archaeologist
• Ecological mitigation, including any licence, and for most new residential development a biodiversity gain plan approved by the authority under the Environment Act 2021 regime
• Materials samples, which sound trivial and routinely are not, because panels have to be built and inspected

The biodiversity gain plan is the one that surprises people, because it is a statutory condition rather than one the officer chose to impose, and it cannot be negotiated away at decision stage.

Lead times and what they do to a programme

There is no single answer, and anyone quoting one is guessing. What you can plan around is the shape of the delay.

An application to discharge conditions is a separate application with its own national fee, charged per request rather than per condition, and the fee schedule is indexed annually, so check the current figures before you budget. The determination period is eight weeks, and authorities frequently use all of it. Planning fees for a new dwelling and the sliding scale sets out how the main application fees work alongside these.

Seasonal survey windows sit on top of that. A bat emergence survey cannot be done in January. Great crested newt environmental DNA sampling runs from mid-April to the end of June. Miss the window and the condition cannot be discharged until the following year, whatever the council does.

There is a deemed discharge route in the legislation for some conditions, where an authority fails to determine in time and the applicant serves notice. It excludes a long list of condition types, including those tied to environmental impact assessment and to obligations, so treat it as a backstop rather than a plan.

Funding the gap

Model the gap explicitly. Three lines in the cash-flow forecast do most of the work: the fees and consultant costs incurred after permission but before start, the finance cost of holding the site through the discharge period, and the contingency for a survey season missed entirely.

An illustrative example. A single-dwelling plot with permission granted in late autumn carries conditions requiring infiltration testing, a tree protection plan and a preliminary ecological appraisal with a possible follow-up bat survey. The infiltration test needs a dry spell. The bat survey cannot start until May. The realistic start on site is the following summer, so the budget carries roughly nine months of finance cost that the appraisal written at offer stage did not include. Figures will differ on every site; the sequencing is what to copy.

Where you have a choice, front-load. Commissioning the ecology and drainage work before determination costs money earlier but removes the condition or shortens its discharge, and the saving on finance usually exceeds the cost of doing it out of sequence.

Negotiating the wording at decision stage

The useful asks are specific.

1. Convert "prior to commencement" to "prior to commencement of development above slab level" or "prior to first occupation" wherever the substance allows it.
2. Ask for the condition to be split, so that the uncontroversial part can be discharged quickly and the difficult part does not hold up the start.
3. Ask for the approving body to be named, because a condition requiring agreement "with the local planning authority in consultation with the highway authority" adds a consultee and a fortnight.
4. Offer a pre-commencement condition you can meet in exchange for removing one you cannot.
5. Get the reason for each condition in writing, since a condition without a defensible reason is the one to challenge.

Where a condition has already been imposed and is unworkable, the route is an application under section 73 to vary it, or section 96A for a non-material change to the wording. Both take time and one of them attracts a fee. Starting work first and arguing later invites an enforcement notice, and it can also break your commencement for levy purposes, which is its own expensive problem. CIL surcharges and a missed commencement notice covers that trap.

When a condition cannot be met at all

Say so early and in writing. Officers deal with this more often than applicants assume, and an honest note setting out why the required evidence cannot be produced, with the alternative proposed, is treated very differently from a late application to vary after the site has been fenced.

If the authority will not move, the section 73 route gives a right of appeal on the condition alone, and the original permission stays alive while it runs. That is a slow answer, but it is an answer, and it costs less than a stalled site with no lawful start. A Construction Management Plan and a Drainage Strategy prepared before determination often stop the condition being written in that form at all.

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.