Planning Permission Expiry in England: A Lawful Start Beats the Clock
In England, permission usually lapses after three years unless the notice says otherwise. Learn what counts as a lawful start and how to keep it live.
Planning Permission Expiry in England: A Lawful Start Beats the Clock
Full planning permission in England normally lapses if development has not begun within three years of the decision date, unless the decision notice sets a different period. Outline permissions and reserved matters follow separate timings. A lawful start, meaning a relevant operation carried out before the deadline, keeps the permission alive, so what counts as starting work matters as much as the date itself.
TL;DR:
- Foundation trenches, pipes to foundations, or construction can qualify as a start; clearance and fencing usually cannot, so document qualifying work and notify the council.
- Outline permission sets three years for reserved matters and generally two years after final approval to begin work, subject to both decision notices.
- Once permission lapses, there is no formal extension route; a fresh application is usually needed, and current policy can require changes or bring refusal.
- Even a lawful start does not protect an unfinished project indefinitely; a completion notice must allow at least 12 months before permission ends.
Table of Contents
- How long does planning permission last?
- What counts as starting work?
- How do outline permission and reserved matters timing work?
- What happens when planning permission expires?
- Can the council end a permission that was started but not finished?
- What should you do if a permission is about to expire or has lapsed?
- What does expiry mean for work that is already under way?
- How do expiry rules differ between householder, outline and full permissions?
- What do real expiry scenarios look like?
- Why does a documented start matter so much?
- How can we help you keep your planning permission live?
- FAQ
- Sources
How long does planning permission last?
The default rule sits in section 91 of the Town and Country Planning Act 1990. In England, full planning permission expires if development has not begun within three years of the date it was granted. Councils can attach a different period through a condition, so the decision notice always has the final word.
Your expiry date is normally recorded on that decision notice. Local authorities such as Rushcliffe Borough Council confirm that permission runs from the decision notice date. The planning portal entry for your application repeats the decision and any conditions, so check both. Some permissions carry bespoke timing conditions, such as shorter periods or phased start dates, and these override the default.
- Default period for full permission: three years from the decision date
- Different periods: only where the decision notice or a condition says so
- Where to look: the decision notice first, then the council’s planning portal entry
- What stops the clock: lawfully beginning development, not finishing it
3 years (England): the default period for full planning permission. If you have not lawfully started by then, the permission lapses.
What counts as starting work?
You do not need to finish a project to preserve its permission. You need to carry out a relevant operation. The explanatory notes describe these as construction works involved in erecting a building, demolition works, digging foundation trenches, and laying pipes and cables to foundations. Once one has been carried out, the rest of the development can be completed later.
Activities that usually qualify:
- Digging foundation trenches for the approved building
- Laying underground pipes or services that run to the foundations
- Demolition that forms part of the approved development
- Starting construction of the building itself
Activities that usually do not qualify on their own include clearing the site, putting up temporary fencing or moving materials onto land. These are preparation, not commencement. Whether a particular act counts depends on the facts and the wording of your permission, so treat these as guidance rather than a guarantee. Keep a contractor’s written statement and dated photographs of whatever was done.
Pro Tip: Once a qualifying operation has taken place, write to your local planning authority to tell them what was done and when, and keep a copy.
How do outline permission and reserved matters timing work?
Outline permission is a two-stage process, and each stage has its own clock. Section 92 of the 1990 Act says reserved matters must normally be applied for within three years of the outline grant. Once the final reserved matters are approved, development must generally begin within two years of that approval.
That two-year window is shorter than the three years given to full permission, which catches people out. A homeowner or developer who has waited a long time to secure reserved matters approval may find very little time left to start on site. The decision notice for both the outline grant and the reserved matters approval can vary these periods, so read both.
Timeline steps to track:
- Date of the outline permission decision
- Deadline for submitting reserved matters (three years from outline grant)
- Date the final reserved matters approval is issued
- Deadline for a lawful start (generally two years after that approval)
What happens when planning permission expires?
An expired permission lapses, and you cannot lawfully rely on it to build. Starting work after the deadline, without having begun before it, means development without permission. There is also no formal mechanism to extend a permission once granted. As one local review body report puts it, the usual route after the deadline passes is a fresh application, judged against current policy.
That last point is the real risk. Policies, local plans and design guidance change, so a scheme approved comfortably a few years ago is not guaranteed approval today.
- Do not start building on the strength of a lapsed permission
- Submit a new application, updating plans to reflect current policy
- Speak to the planning officer early about what has changed
- Do not confuse this with permitted development: those rights are a separate regime, and Gov explains that time-limited permitted development rights should not be confused with the standard three-year expiry
Can the council end a permission that was started but not finished?
Yes. Beginning work does not make a permission permanent. Under section 94 of the 1990 Act, a local planning authority can serve a completion notice where development has begun but not been completed. The notice must allow a further period of at least 12 months before the permission ceases to have effect.
Enforcement runs on a separate track. The same GOV.UK enforcement guidance summarises the time limits for taking action against breaches, which differ by type of breach and have changed over the years. For a half-built extension, that matters because the lawfulness of what stands depends on how and when it was built.
- A completion notice must give at least 12 months before the permission ends
- Enforcement time limits depend on the type of breach
- Partly completed work may be left without cover once a notice takes effect
- If you receive or suspect a notice, take professional advice promptly
What should you do if a permission is about to expire or has lapsed?
Work through these steps in order:
- Check the decision notice and the planning portal entry for the exact expiry date and any conditions.
- Document any qualifying works with dated photographs and written contractor statements.
- Notify the local planning authority in writing of what has been done and when.
- Only start urgent works if they genuinely qualify as a commencement, not as a hopeful gesture.
- If the permission has expired, prepare a fresh application with updated plans and talk to the planning officer early.
Expect a new application to take time, and plan for the chance of revisions if policy has moved on. Contractor availability matters too, since a start date you cannot meet is no use. A partner article on bathroom installation timelines shows how quickly trades can book up, and the same logic applies to groundworkers.
Pro Tip: Keep every dated record in one folder, and where you can, use one managed supplier to coordinate planning and works so the paperwork and the start date stay aligned.
For a wider look at durations, our guide to the planning permission timeline covers what UK homeowners can expect.
What does expiry mean for work that is already under way?
The answer turns on whether the work began lawfully before the deadline. If a relevant operation was carried out in time, the permission survives, and you can finish the build after the three years have passed. That is why dated evidence of the start matters: it is your proof that the permission never lapsed.
The trouble comes when work started in a way that does not count. Say a site was cleared and fenced before the deadline, but no foundations were dug. The permission may well have lapsed, and anything built since is development without permission. The council can then take enforcement action, and the cost of putting that right is far higher than the cost of checking at the start.
Even a valid start does not give unlimited time. A site left half-finished for years can attract a completion notice, which sets a deadline of at least 12 months after which the permission ceases. Whatever remains unbuilt then has no cover. A new application for the unfinished part would be judged against current policy, with no guarantee of the same outcome.
If you are mid-build and unsure, stop and establish the facts before spending more. Gather the decision notice, any condition about timing, and every record of what was done and when. Then ask your planning officer or an adviser whether the start was lawful. It is also worth keeping building regulations in step with planning. Our note on getting a completion certificate for extensions in England explains how final sign-off fits alongside the planning position.
How do expiry rules differ between householder, outline and full permissions?
The underlying rule is the same for most permissions: a time limit for starting, set by statute unless the decision notice says otherwise. What changes is the clock. Householder permission, for example an extension to a family home, is a form of full permission, so the standard three-year default normally applies from the decision date.
Full permission follows section 91 in the same way. Outline permission runs on two stages: reserved matters within three years, then a start within two years of the final approval. A householder and a developer can therefore have quite different deadlines even though both are in England.
Other kinds of permission vary further. Temporary permissions carry explicit end dates, and in Scotland, Highland Council guidance notes that planning permission in principle has a longer default period of five years. That is a different system, so do not apply it to England, but it shows why you should never assume a period without reading your own notice.
Permitted development sits outside all of this. These are rights granted nationally, not a permission with a decision notice, and some are time-limited or need notification on completion, as GOV.UK guidance on when permission is required explains. If you are weighing that route for a rear extension, our article on the prior approval extension in England sets out how it works.
What do real expiry scenarios look like?
These are illustrative scenarios based on how the rules operate, not reports of specific cases.
The lapse nobody noticed. A homeowner gets full permission for a rear extension, then delays for family reasons. Three years pass with no work on site. The permission has lapsed, and there is no extension mechanism. They submit a fresh application, and the planning officer applies the current local plan. The scheme needs redesign, which adds time and cost.
The timely start. Another owner, facing a looming deadline, has a contractor dig the foundation trenches for the approved extension and lay the pipes running to them. The contractor provides a signed statement and dated photographs, and the owner writes to the council. The permission is preserved, and the rest of the build proceeds the following year.
The outline squeeze. A developer holds outline permission and wins reserved matters approval late in the three-year window. They then have only two years to start. A managed programme that aligns planning with groundwork booking meets the date, whereas a slower approach would have risked a lapse.
The stalled site. A build started lawfully but was left unfinished for years. The council serves a completion notice, giving at least 12 months. The owner responds by agreeing a programme to complete, and takes advice on the position before the period ends.
The common thread is evidence and early action. If you are planning a rear extension, our rear extension planning guide covers the rules that apply to your project.
Why does a documented start matter so much?
I think too many owners treat the three-year deadline as a vague background fact and discover its force only when it has gone. A careful, documented start is cheap insurance. A trench dug, a photograph dated, a letter sent: these cost little, and they can save a reapplication that costs months and offers no guarantee of the same answer.
I also believe expiry risk is mostly a coordination problem. Planning and the build schedule are too often handled by different people who never compare calendars. Services that manage both together lower the risk simply because someone is watching the date. Where you are in doubt, combine good records with professional help.
— Esskay
How can we help you keep your planning permission live?
Missing a planning deadline usually comes down to nobody owning the date. For single-storey rear extensions, we manage that for you: design, planning and construction run through one in-house team, so the paperwork and the start on site stay in step. We handle Permitted Development and prior approval routes where they suit your project.
- Instant online quote and booking, so you can get moving without waiting on site visits
- Planning handled alongside design and build, which reduces expiry risk
- A fixed VAT-inclusive price and a workmanship warranty
Get your price today with our instant extension quote tool, or see our single-storey rear extension service.
FAQ
How long does planning permission last in England?
Full planning permission normally lasts three years from the decision date, after which it lapses if development has not begun. The decision notice can set a different period, so check it first. The default comes from section 91 of the Town and Country Planning Act 1990.
Can you extend planning permission once it has been granted?
There is no formal mechanism to extend a permission once it has been granted. If the deadline passes without a lawful start, the usual option is a fresh application, which is judged against current policy. Starting a relevant operation before the deadline is what preserves the permission.
What counts as starting work to keep planning permission?
A relevant operation counts, such as digging foundation trenches, laying pipes to foundations, demolition forming part of the development, or beginning construction of the building. Site clearance and temporary fencing usually do not. Keep dated photographs and a contractor’s statement as evidence.
What happens if planning permission expires before I build?
The permission lapses and you cannot lawfully rely on it. You would normally need to submit a new planning application, and current policies may change the outcome. Permitted development rights are a separate regime and are not revived by expiry.