Developers spend months securing planning permission, then risk delaying the entire project by overlooking the conditions attached to it.

For high-value developments, securing approval is an important achievement. Months of consultation, negotiation and financial investment have finally produced the decision everyone has been working towards.

Contractors begin preparing to mobilise, procurement commitments are made and funding arrangements progress.

But there is an assumption here that deserves challenging.

Planning permission does not automatically mean a project is ready for construction.

And overlooking that distinction can create serious commercial consequences.

When permission comes with complications 

Planning conditions are not simply administrative requirements. They determine what happens next on your development, and failing to understand them can leave an otherwise viable project unable to proceed.

Some require additional technical information before construction begins. Others impose restrictions on design, site operations or particular stages of development.

Consider a residential development where permission has been granted, but work cannot commence until further drainage details receive approval.

The site is ready, the construction programme has been agreed but an outstanding pre-commencement condition prevents work from starting.

Every additional week of uncertainty puts pressure on delivery commitments, financing arrangements and project margins.

What appeared to be a straightforward planning requirement has become a commercial problem.

This is why I believe developers should give planning conditions the same scrutiny as their construction contracts.

Are all planning conditions reasonable? 

Planning authorities do not have unlimited discretion when imposing conditions.

National planning policy establishes six tests. Conditions should be necessary, relevant to planning, relevant to the development, enforceable, precise and reasonable in all other respects.

These safeguards matter because there is an important distinction between a condition which is inconvenient and one which raises genuine legal concerns.

A requirement for additional environmental information might delay progress, but inconvenience alone does not establish unlawfulness.

Equally, a condition which appears unreasonable, unclear or unrelated to the development warrants closer examination.

Developers also need to understand the available legal routes.

Section 78 of the Town and Country Planning Act 1990 provides a route for appealing against conditions attached to planning permission. Judicial review, by contrast, concerns the lawfulness of the decision-making process.

These are different mechanisms, and choosing the wrong approach risks wasting valuable time and resources.

Why early scrutiny protects commercial interests

In my work involving construction and engineering disputes, I frequently see how overlooked legal requirements become expensive problems once project delivery is under pressure.

What concerns me is the attention given to negotiating construction contracts while planning conditions sometimes receive far less scrutiny.

Developers will spend months examining payment provisions, delay clauses and contractual liabilities.

Yet a planning condition affecting the entire construction programme might not receive the same attention.

That makes little commercial sense.

Before committing to mobilisation, developers should understand which conditions require approval, who is responsible for discharging them and how outstanding requirements affect the programme.

Where legal concerns arise, early assessment is essential, particularly when strict deadlines apply.

The mistake is assuming that because permission has been granted, the legal uncertainty has disappeared.

Continuing the discussion

Planning conditions are one example of why understanding the legal basis of a planning decision matters.

But the wider issue is what happens when a planning decision itself is legally flawed.

That is what I will be examining in my upcoming Planning Series webinar, Planning Judicial Review: Challenging Unlawful Planning Decisions.

I will explore the grounds for challenging unlawful planning decisions, the applicable deadlines, the evidence required and the remedies available.

Registration is now open for developers and planning professionals who want to better understand their legal options: 

If your planning permission was granted tomorrow, would your team be ready to proceed, or would the conditions reveal risks nobody had properly considered?