How Long Does Planning Permission Last?

At a glance

Planning permission in the UK does not last forever. Full planning permission is valid for three years from the date it is granted - not from when you start work. Outline planning permission gives you three years to get reserved matters approved, and then a further two years to begin construction. Once permission expires, it cannot be extended or renewed - you must submit a new planning application. This guide explains the time limits for every type of planning permission, what counts as starting work, what to do if your permission is about to expire, and how planning permission affects the value of your property when selling.

What is planning permission, and why does it expire?

Planning permission is legal consent from your local planning authority (LPA) to carry out development that would otherwise be restricted under planning law. It covers everything from home extensions and loft conversions to new builds and changes of use.

Permission is time-limited for a practical reason: planning policy changes over time. What was acceptable under the local development plan three years ago may no longer reflect current priorities around housing density, environmental standards, design guidance or infrastructure capacity. Expiry dates ensure that development takes place while the conditions under which it was approved still apply.

Under the Town and Country Planning Act 1990, every planning permission must be granted with a condition specifying when development must commence. The default period is three years, unless the local planning authority specifies a different timeframe.

How long does each type of planning permission last?

There are several types of planning permission in England, each with different time limits.

Note: Scotland and Wales operate under different planning frameworks. In Wales, the default period for full planning permission was extended to five years under the Planning (Wales) Act 2015, though individual councils may set different conditions. Always confirm the time limit stated in your specific decision notice.

Full planning permission - the 3-year rule explained

Full planning permission is the most common type granted for residential and commercial development. It covers complete, detailed proposals - a new build, a large extension, a change of use - where all details have been submitted and approved upfront.

The three-year clock starts from the date permission is granted, not from the date you receive the letter, not from when you intend to start, and not from when you purchase the land. This is a common misunderstanding that leads homeowners and developers to lose permissions they thought were still valid.

You do not need to complete the development within three years. You only need to start. Once development has lawfully commenced within the three-year window, the permission is effectively locked in and remains valid until the works are finished - provided no completion notice is served by the local authority.

Outline planning permission - a different timeline

Outline planning permission grants approval in principle for a development without requiring all the details to be finalised upfront. It is commonly used for larger residential or commercial developments where the full design will be worked out later.

The timeline for outline permission works differently:

• You have three years from the date outline permission is granted to apply for approval of reserved matters
• Once reserved matters are approved, you have two years to start construction
• If reserved matters are not applied for within three years, the outline permission expires

Reserved matters are the details left over from an outline application - typically appearance, landscaping, layout, means of access and scale. Each reserved matters application must be submitted within the three-year window, and construction must then begin within two years of each reserved matters approval.

This two-stage timeline can catch developers out. The total window from outline permission to lawful commencement of development can be up to five years in some cases, but only if reserved matters are applied for and approved promptly within the initial three-year period.

What counts as starting work?

This is one of the most important and most misunderstood aspects of planning permission. The Town and Country Planning Act 1990 defines the commencement of development as a material operation. The following activities qualify:

If your planning permission is approaching expiry and development has not yet commenced, speak to a planning consultant or your local planning authority before taking any action. They can advise on the most appropriate steps for your specific circumstances, including what would constitute a lawful commencement of the approved development.

Once a qualifying material operation has taken place, it is strongly advisable to apply for a Certificate of Lawful Development from your local planning authority. This provides formal confirmation that the development has lawfully commenced and protects you if the start is later disputed.

How to check when your planning permission expires

Your planning permission expiry date will be stated in the decision notice issued by your local planning authority. The exact wording will appear as a condition - typically worded as: "The development hereby permitted shall be begun before the expiration of three years from the date of this permission."

If you cannot find your original decision notice, you can search for it through the Planning Portal, which holds records for planning applications in England and Wales. Your local council's planning department will also be able to confirm the details of any permission granted on your property.

It is worth checking the exact grant date and any non-standard time conditions attached. While three years is the default, some councils do impose shorter or longer periods for specific types of development.

Can you extend planning permission?

No, not automatically, and not easily.

The option to extend planning permission by paying a fee, which was previously available where there were no significant changes to the site or local planning policy, was removed in 2013. As of 2026, that option is no longer available.

There is also no automatic right to extend a planning permission that is still live. A 2023 update to legislation gave local planning authorities greater powers to take into account the non-implementation of previous permissions when assessing new applications. This means that if you allow a permission to lapse without starting work, a new application for the same development could face additional scrutiny.

If your permission is approaching expiry, speak to your local planning authority or a planning consultant at the earliest opportunity. The options available depend on your specific circumstances and the stage the development has reached.

Reapplying for expired planning permission - what to expect

Reapplying for planning permission after it has expired does not carry an automatic penalty, but it is not a simple renewal. The local planning authority will assess the application as if it were entirely new.

Before reapplying, it is worth checking:

• Whether local planning policy has changed since the original permission was granted
• Whether any relevant national planning guidance has been updated
• Whether the proposed development still meets current requirements on things like design, energy efficiency, flood risk or biodiversity net gain
• How similar recent applications on comparable sites have fared

For most residential applications - extensions, loft conversions, outbuildings - the process is relatively straightforward. For larger or more complex developments, or for properties in sensitive areas such as conservation areas or green belt land, a pre-application discussion with the local planning authority is advisable before submitting a new application.

Application fees apply and are updated periodically. As of April 2026, a typical householder application in England costs £548 and in Wales £585. Always confirm the current fee before submitting using the Planning Portal fee calculator or by contacting your local authority directly, as fees are subject to annual review.

Does planning permission affect property value?

Yes, significantly. Planning permission - particularly for extensions, additional dwellings or change of use - can add meaningful value to a property. Outline planning permission on land can increase its value considerably, as it demonstrates development potential.

When selling a property with existing planning permission, it is worth being clear in the listing about:

• What the permission covers
• When it was granted
• How much time remains before it expires
• Whether any pre-commencement conditions have been discharged

A permission with limited time remaining is less valuable than one that has been recently granted or where development has already commenced. Estate agents will typically highlight this in marketing materials, as buyers - particularly developers - will assess the risk and timeline carefully.

If you are selling a property and planning permission is a relevant factor, GetAgent's comparison tool lets you compare local estate agents by their performance data before deciding who to instruct.

Permitted development rights - a separate route

Not all works require planning permission. Permitted development rights allow certain types of development to be carried out without a full planning application, provided the work falls within specified limits.

Common works that may fall under permitted development include:

• Single-storey rear extensions up to 4 metres for detached houses (3 metres for other house types) under the standard rules, or larger under the larger homes extension scheme
• Loft conversions within specified volume limits
• Outbuildings within certain size restrictions
• Solar panels on roofs

Permitted development rights do not expire in the same way as planning permission. However, they come with conditions and restrictions, and they are not available to all properties. Flats, listed buildings, and properties in conservation areas or areas of outstanding natural beauty may have permitted development rights removed or restricted.

If you are uncertain whether your planned works require planning permission or fall within permitted development rights, the Planning Portal common projects guide provides useful guidance by project type, and pre-application advice is available from most local planning authorities.

Planning permission in Scotland and Wales

The rules described in this article apply primarily to England. Scotland and Wales have their own planning systems.

For properties in Scotland, the relevant guidance is published by Scottish Government Planning. For Wales, guidance is published by Planning Policy Wales.

Key dates and the enforcement time limits

A related concept that sometimes causes confusion is the planning enforcement time limit - sometimes referred to as the 4-year rule or the 10-year rule.

These are not the same as the expiry of planning permission. They relate to how long a local planning authority has to take enforcement action against unauthorised development.

From 25 April 2024, the Levelling-up and Regeneration Act 2023 changed the enforcement time limit to 10 years for all breaches of planning control in England, replacing the previous split between 4 years for operational development and 10 years for other breaches.

This is an important distinction. The enforcement time limits tell you how long a council has to act against unauthorised development. They are entirely separate from the question of how long a planning permission remains valid for implementation.

If you are purchasing a property where work was carried out without planning permission, understanding the relevant enforcement time limit is important. Always take legal advice before completing a purchase on a property with unauthorised works.

If you're seeking planning permission to add value to your home, you can always find your home's current value using our instant Online Valuation Tool here!