How to Vary or Remove Planning Conditions

Planning permission often feels like a milestone — the point where a project can finally move forward. But for many developers, homeowners and businesses, that excitement is tempered when they realise that the permission is tied to conditions that don’t quite fit their needs.

Maybe the local planning authority (LPA) restricted delivery hours more tightly than expected.

Perhaps the approved plans need a small tweak to accommodate a change in layout or construction method. Or maybe a pre-occupation condition is simply unworkable.

The good news is that the planning system does provide a mechanism for amending or removing most conditions without having to start from scratch. It’s called a Section 73 application, and it’s one of the most useful — but often misunderstood — tools in the Town and Country Planning Act.

In this article, I’ll explain what Section 73 can (and can’t) do, why it’s so widely used, the legal limits confirmed by key case law, and how to approach an application or appeal for the best chance of success.

What is a Section 73 application?

Section 73 of the Town and Country Planning Act 1990 allows an applicant to seek permission to carry out development without complying with one or more conditions previously attached to a planning permission.

In everyday terms, it lets you ask the LPA to remove, relax, or modify a condition — for example:

• Extending opening hours of a commercial use.

• Amending the list of approved drawings to reflect design changes.

• Removing an outdated restriction that no longer serves a purpose.

If the LPA grants the Section 73 application, it issues a new planning permission. The original permission remains intact and unaltered, but you’ll now have an alternative consent you can choose to implement.

That distinction is critical: Section 73 doesn’t “amend” the old permission — it creates a fresh one.

Why would you use Section 73 instead of a new application?

A Section 73 route is often quicker, cheaper, and more proportionate than submitting a new full application.

If the principle of development has already been established, there’s no need to re-argue it. The only question before the LPA (and the Planning Inspectorate on appeal) is what conditions should apply.

That focus makes Section 73 ideal for:

• Minor design revisions: moving windows, altering materials, or re-positioning a structure.

• Operational adjustments: revising hours, deliveries, or management plans.

• Compliance updates: modernising drainage, lighting, or landscaping details to reflect current best practice.

It’s also the correct route if you want to remove an onerous condition that restricts flexibility — for example, a condition limiting the use of a building to “holiday accommodation only” when you now wish to use it as a dwelling within Class C3.

The legal framework in plain English

When you submit a Section 73 application, the LPA must consider only the question of the conditions. They can either:

• Grant permission subject to the same conditions,

• Grant it with varied or fewer conditions, or

• Grant it unconditionally.

If they refuse, you can appeal under Section 78(1)(a) of the Act, which gives you the right to challenge that refusal (or any new conditions imposed).

Importantly, because the result is a new planning permission, the LPA should restate all relevant conditions from the original consent — not just the varied one — so that the new permission reads clearly in its own right.

The Finney judgment: where Section 73 stops

For years, Section 73 was sometimes treated as a convenient way to make almost any amendment to a scheme. That changed decisively with the Court of Appeal judgment in Finney v Welsh Ministers [2019].

In Finney, the developer had permission for two wind turbines with a tip height of 100 metres. They submitted a Section 73 application to vary a condition listing the approved plans, substituting drawings for 125-metre turbines. The LPA refused, the appeal was allowed, and the Inspector amended the condition.

However, the Court found that increasing the turbine height changed the operative description of development — the core wording of what had been permitted (“two turbines with a tip height of 100 metres”). Because Section 73 only allows changes to conditions, not to the description, the Inspector’s decision was quashed.

The principle from Finney is now clear:

A Section 73 application cannot be used to change the description of development in a planning permission.

In practice, this means:

• You can’t use Section 73 to increase or reduce the number of dwellings.

• You can’t change a use (e.g. from offices to flats) unless that flexibility already exists in the permission.

• You can’t add entirely new buildings or structures.

If your proposed change conflicts with the description, you’ll need a new planning application instead.

Other key cases reinforcing Finney

Several subsequent judgments have built on the same logic:

• Fiske v Test Valley BC (2020): removing a substation from a solar-farm layout was unlawful because it conflicted with the original description, which had included one.

• Reid v SSLUHC (2023): removing restrictive conditions can be lawful where it doesn’t contradict the operative description.

• Armstrong v SSLUHC (2023): confirmed that Section 73 isn’t limited to minor amendments, but changes must still stay within the same development description.

Together, these cases draw a clear boundary: you can vary the conditions that shape a permission, but not the permission itself.

How Section 73 relates to other appeal routes

You might remember from our earlier guide — “When Can You Appeal a Planning Condition?” — that Section 73 is just one of several tools available. It sits between:

• Section 79 appeals, which challenge conditions immediately after permission is granted; and

• Section 73A appeals, which deal with conditions retrospectively once development has already taken place.

Unlike those, a Section 73 application is proactive: it lets you negotiate flexibility while a permission is still live, avoiding enforcement risk later.

Timing: the importance of an extant permission

A Section 73 application can only be made while the original permission is still in effect.

If the time limit for commencement has expired and the development hasn’t started, you can’t use Section 73. In that case, the permission has lapsed and you’ll need to re-apply for full planning permission.

Once the permission has been lawfully implemented (i.e. works have started in accordance with the approved details), you can apply under Section 73 at any time — even years later — provided the condition you’re varying still has effect.

That’s useful for operational businesses or long-term developments that need flexibility down the line.

Practical examples

Here are a few real-world examples of how Section 73 works in practice:

Example 1: Extending opening hours

A small restaurant has permission to operate between 9 am and 6 pm. The owner wants to serve evening meals until 10 pm. A Section 73 application seeks to vary the condition limiting hours.

• The LPA assesses whether extended hours would cause unacceptable noise or disturbance.

• If no significant harm is found, the condition can be relaxed.

• If refused, the applicant can appeal; an Inspector will weigh the same issues.

Example 2: Updating approved plans

A developer realises mid-build that relocating a window improves internal layout and reduces overlooking. Rather than a new full application, they submit a Section 73 to vary the plans condition, substituting the updated drawing.

Because the change doesn’t alter the scale, height or description of development, it’s within Section 73’s powers.

Example 3: Removing a redundant condition

A 2008 permission for a rural conversion includes a condition requiring Code for Sustainable Homes certification — a standard abolished years ago. A Section 73 application removes it, since it no longer serves a planning purpose.

What about pre-commencement conditions?

Section 100ZA of the Act requires the written agreement of the applicant before any pre-commencement condition is imposed. If such a condition slipped through without your agreement, you can use Section 73 to seek its removal or amendment.

However, once development has already started, the wording of that condition may make retrospective removal impossible — so timing is key.

What happens if the LPA refuses?

If the LPA refuses a Section 73 application, or if they approve it but add new unwanted conditions, you can appeal to the Planning Inspectorate within six months.

On appeal, the Inspector will:

1. Consider only the conditions (not the wider merits of the scheme).

2. Assess whether the disputed condition meets the six tests from the NPPF.

3. Decide whether the new or modified wording would avoid harm.

The Inspector’s decision, if allowed, will again create a new planning permission — so be careful that all necessary conditions (such as landscaping or construction hours) are restated to avoid ambiguity.

Section 73 and planning obligations

Because a successful Section 73 application generates a fresh permission, any associated planning obligations (s106 agreements) need to be carried forward or varied to apply to the new consent.

Failing to do this can have unintended consequences. In Norfolk Homes Ltd v North Norfolk DC (2020), a developer secured a Section 73 permission without linking the existing s106. The court found the new consent free from affordable-housing and infrastructure obligations — a costly loophole for the council, and a reminder for applicants to ensure documentation aligns.

The simplest approach is to sign a Deed of Variation alongside the Section 73 approval, confirming that the obligations attach to both the original and varied permissions.

What Section 73 can’t do

Even though Section 73 is flexible, there are hard limits:

• ❌ It can’t amend the description of development.

• ❌ It can’t extend the statutory commencement period.

• ❌ It can’t grant a new approval of reserved matters or prior approval.

• ❌ It can’t be used once a permission has lapsed without implementation.

For those scenarios, a new full application or (in some limited cases) a Section 73A retrospective application will be necessary.

Common pitfalls and how to avoid them

1. Assuming “minor material amendment” means trivial.
   There’s no statutory definition of “minor” in Section 73 — what matters is whether the change stays within the same development description.

2. Forgetting about other conditions.
   When varying one condition, make sure all relevant others are carried across. Missing a pre-occupation or drainage condition could render the new consent unusable.

3. Overlooking planning obligations.
   Always confirm that s106 agreements or unilateral undertakings extend to the new permission.

4. Using the wrong route.
   If the change affects the fundamental nature or scale of development, don’t force it through Section 73 — it risks being declared unlawful later.

5. Ignoring the bigger picture.
   Although the LPA can only consider conditions, they’ll still assess the effects on neighbours, highways and policy objectives. Supporting evidence — acoustic surveys, transport notes, etc. — is often worth including.

Why professional advice helps

Although Section 73 seems straightforward on paper, its implications are surprisingly technical. The interplay between conditions, descriptions, case law, and planning obligations can easily trip up even experienced applicants.

As an RTPI-chartered planning consultant, I often find that a short professional review at the outset can save months of delay later — particularly where there’s a risk of crossing the line between “variation” and “new development.”

A well-structured Section 73 application (or appeal) should read like a concise planning statement: explaining what’s changing, why it remains policy-compliant, and how it continues to meet the six tests for conditions.

Final thoughts

Used wisely, Section 73 can be a developer’s best friend. It provides a legitimate, efficient way to refine a project as designs evolve or operational needs change — without reopening the entire planning debate.

But it’s equally important to recognise its limits. Push it too far, and you risk an invalid permission or a costly legal challenge down the line.

If you’re unsure whether a proposed change sits comfortably within Section 73, or whether an appeal might be the right route, get professional advice early. A short review by a planning consultant can confirm the correct approach — and help you avoid the common traps that others have already fallen into.

About Me

Andrew Ransome is the planning director at ADP and is a chartered member of the RTPI, with over 22 years of town planning experience.

Andrew has extensive experience offering strategic planning solutions to challenging projects in both rural and urban settings. Follow him on Linkedin.

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