United Kingdom
Planning Permission UK: When You Need It and Permitted Development Rules by Nation
Independently fact-checked against primary sources (last audited September 28, 2026). · 16 primary sources cited on this page. How we verify our legal content
Whether you need planning permission for building work depends on which UK nation you are in, since England, Wales, Scotland and Northern Ireland each run their own General Permitted Development Order (GPDO), the instrument that pre-authorises certain minor works without a planning application, and each has its own enforcement time limit for a breach that goes unchallenged.
What planning permission and permitted development mean
Most building work, or a change in how land or a building is used, needs planning permission from the local planning authority, unless it falls within a permitted development right (gov.uk: planning permission in England and Wales). A permitted development right comes from a General Permitted Development Order (GPDO), a statutory instrument that pre-authorises defined categories of minor work nationally, so the applicant does not need to apply case by case. Each right still carries its own conditions and size limits, set out in the Order's own schedule.
Each nation runs its own General Permitted Development Order
| Nation | Instrument | In force |
|---|---|---|
| England | Town and Country Planning (General Permitted Development) (England) Order 2015 (SI 2015/596) | From 15 April 2015 |
| Wales | Town and Country Planning (General Permitted Development) Order 1995 (SI 1995/418), as amended for Wales | Still the operative Order for Wales |
| Scotland | Town and Country Planning (General Permitted Development) (Scotland) Order 1992 (SI 1992/223), as amended | Applies to all land in Scotland |
| Northern Ireland | Planning (General Permitted Development) Order (Northern Ireland) 2015 | From 1 April 2015 |
(legislation.gov.uk: England 2015 Order; Wales 1995 Order; Scotland 1992 Order; Northern Ireland 2015 Order)
Wales is the trap here. England's 1995 Order was revoked for England only when the 2015 Order took over, but it was never replaced for Wales, so Wales's permitted development rights still run from the amended 1995 Order rather than from a separate Welsh 2015 Order. Do not assume Wales mirrors England's current Order just because the two once shared the same original instrument.
Permitted development for householder extensions, and the neighbour consultation scheme
Common projects such as small extensions, loft conversions and outbuildings can often go ahead as permitted development rather than needing a full application, but the exact depth, height and volume limits for each class sit in the relevant Order's schedule and in separate technical guidance, and they differ by nation. In England, a larger single storey rear extension built under permitted development rights goes through a neighbour consultation scheme: a form of prior approval where the local planning authority notifies adjoining neighbours of the proposal and steps in to decide only if a neighbour objects (gov.uk: when is permission required).
Because the class by class dimensions change and differ across all four nations, this page covers the concept rather than trying to maintain a dimensional reference table. Check the current technical guidance or your local planning authority, or use the Planning Portal, before relying on a specific size limit. For fence and boundary height limits specifically, see fence and boundary law, which already covers that permitted development right in detail.
How long a council has to take enforcement action
England: a unified 10 year limit, from 25 April 2024. The Levelling-up and Regeneration Act 2023 raised England's ordinary enforcement time limit to 10 years. Before this change, two of the three limits in section 171B of the Town and Country Planning Act 1990 stood at 4 years (operational development, and a change of use to a single dwellinghouse), while the third, covering all other breaches such as an unauthorised change of use not to a single dwelling, was already 10 years. The 2023 Act raised the two 4 year limits to meet the third, so England's ordinary limit is now 10 years for all three kinds of breach (legislation.gov.uk: Levelling-up and Regeneration Act 2023, section 115). Two exceptions in the 1990 Act remain: there is no time limit for unauthorised 'relevant demolition', meaning demolition of an unlisted building in a conservation area in England without the required planning permission (legislation.gov.uk: Town and Country Planning Act 1990, section 171B; section 196D), and a magistrates' court can make a planning enforcement order for a deliberately concealed breach in England, which allows action even after the time limit has run (legislation.gov.uk: section 171BA).
This only applies going forward: the new 10 year limit covers a breach where the operations were substantially completed, or the breach occurred, on or after 25 April 2024. Operations substantially completed, or a change of use to a single dwellinghouse that occurred, before that date keep the previous 4 year limit (legislation.gov.uk: commencement regulations, regulation 5).
Wales: the 4 year limit was expressly kept, for two specific kinds of breach. The same 2023 Act, in the same section, wrote Wales's 4 year limit into the amendment by name for operational development and for a change of use to a single dwellinghouse. Wales's limit for every other kind of breach was already 10 years and was not touched (same source).
Scotland and Northern Ireland: separate regimes, not covered by this change. The Levelling-up and Regeneration Act 2023 is England and Wales planning legislation. Scotland's enforcement time limits run under the Town and Country Planning (Scotland) Act 1997, and Northern Ireland's run under the Planning Act (Northern Ireland) 2011, neither of which was amended by the 2023 Act. In Scotland the limits are 4 years for operational development and for a change of use to a single dwellinghouse, and 10 years for any other breach (legislation.gov.uk: Town and Country Planning (Scotland) Act 1997, section 124); in Northern Ireland a single 5 year limit applies to every kind of breach (legislation.gov.uk: Planning Act (Northern Ireland) 2011, section 132).
Lawful development certificates
A Lawful Development Certificate confirms that an existing use, an operation already carried out, or an activity that breaches a planning condition is lawful for planning purposes, or that a proposed use or operation would be lawful if carried out. It establishes that no planning enforcement action applies, or that planning permission is not required (gov.uk: Lawful Development Certificates). That is the England and Wales instrument; Scotland and Northern Ireland have an equivalent certificate of lawfulness of existing use or development, under section 150 of the Town and Country Planning (Scotland) Act 1997 and section 169 of the Planning Act (Northern Ireland) 2011 (legislation.gov.uk: Scotland, section 150; Northern Ireland, section 169). This is worth applying for once work has stood beyond the relevant enforcement time limit, or to get written confirmation that a permitted development right applies before starting work, rather than relying on your own reading of the Order.
Related reading
Tree protection orders and conservation area rules for trees and hedges are covered separately: see high hedges and trees. If your project sits on or near a shared wall, see the party wall agreement process. For the wider set of property topics, see the UK property law hub.
Frequently Asked Questions
Do all four UK nations use the same planning permission rules?
No. England, Wales, Scotland and Northern Ireland each run their own General Permitted Development Order under their own planning Act, so what counts as permitted development, and the enforcement time limit for an unauthorised breach, can differ by nation.
How long does a breach of planning control have to stand before it becomes immune from enforcement in England?
Usually 10 years, for a breach occurring, or operations substantially completed, on or after 25 April 2024. A breach from before that date keeps the previous 4 year limit for operational development and change of use to a single dwellinghouse, or the existing 10 year limit for other kinds of breach.
Does Wales have the same 10 year planning enforcement limit as England?
Only partly. Wales kept a 4 year limit for operational development and a change of use to a single dwellinghouse, written expressly into the same Act that raised England's limit. Other breaches in Wales already carried a 10 year limit before this change and were not affected.
What is a Lawful Development Certificate for?
It confirms that an existing use, operation or breach of a planning condition is lawful for planning purposes, or that a proposed use or operation would be lawful. It is useful once unauthorised work has stood beyond the enforcement time limit, or to confirm in advance that permitted development rights apply.
Is Wales's General Permitted Development Order the same age as England's?
No. England replaced its Order in 2015. Wales never got a separate 2015 Order: Wales's permitted development rights still run from the amended 1995 Order, which was only revoked for England.
Where can I check the exact size limits for a permitted development extension?
This page covers the concept and the enforcement rules rather than class by class dimensions, since these differ by nation and change over time. Check the official technical guidance, the Planning Portal, or your local planning authority before relying on a specific size limit.
Updates
Independently fact-checked against the cited primary sources
The Law Behind This Article
This article rests on the statutory provisions below, held in our own legal record and retrieved from the official source. Tap a section to read the operative text.
Planning Act (Northern Ireland) 2011
s. 132Time limitsIn force
(1) Where there has been a breach of planning control consisting in the carrying out without planning permission of building, engineering, mining or other operations in, on, over or under land, no enforcement action may be taken after the end of the period of 5 years beginning with the date on which the operations were substantially completed. (2) Where there has been a breach of planning control consisting in the change of use of any building to use as a single dwelling-house, no enforcement action may be taken after the end of the period of 5 years beginning with the date of the breach. (3) In the case of any other breach of planning control, no enforcement action may be taken after the end of the period of 5 years beginning with the date of the breach. (4) The preceding subsections do not prevent— (a) the service of a breach of condition notice in respect of any breach of planning control if an enforcement notice in respect of the breach is in effect;
Official text (excerpt) · last checked 2026-08-14 · Read the full text in our law library · Verify at legislation.gov.uk
s. 169Certificate of lawfulness of existing use or developmentIn force
(1) If any person wishes to ascertain whether— (a) any existing use of buildings or other land is lawful; (b) any operations which have been carried out in, on, over or under land are lawful; or (c) any other matter constituting a failure to comply with any condition or limitation subject to which planning permission has been granted is lawful, that person may make an application for the purpose to the appropriate council specifying the land and describing the use, operations or other matter. (2) For the purposes of this Act uses and operations are lawful at any time if— (a) no enforcement action may then be taken in respect of them (whether because they did not involve development or require planning permission or because the time for enforcement action has expired or for any other reason); and (b) they do not constitute a contravention of any of the requirements of any enforcement notice then in force. (3) For the purposes of this Act any matter constituting a failure to comply with any condition or limitation subject to which planning permission has been granted is lawful at any time if— (a) the time for taking enforcement action in respect of the failure has then expired;
Official text (excerpt) · last checked 2026-08-14 · Read the full text in our law library · Verify at legislation.gov.uk
Town and Country Planning Act 1990
s. 171bTime limits.In force
(1) Where there has been a breach of planning control consisting in the carrying out without planning permission of building, engineering, mining or other operations in, on, over or under land, no enforcement action may be taken after the end of the period of— (a) in the case of a breach of planning control in England, ten years beginning with the date on which the operations were substantially completed, and (b) in the case of a breach of planning control in Wales, four years beginning with the date on which the operations were substantially completed. (2) Where there has been a breach of planning control consisting in the change of use of any building to use as a single dwellinghouse, no enforcement action may be taken after the end of the period of— (a) in the case of a breach of planning control in England, ten years beginning with the date of the breach, and (b) in the case of a breach of planning control in Wales, four years beginning with the date of the breach. (2A) There is no restriction on when enforcement action may be taken in relation to a breach of planning control in respect of relevant demolition (within the meaning of section 196D).
Official text (excerpt) · last checked 2026-08-14 · Read the full text in our law library · Verify at legislation.gov.uk
s. 171baTime limits in cases involving concealmentIn force
(1) Where it appears to the local planning authority that there may have been a breach of planning control in respect of any land in England, the authority may apply to a magistrates' court for an order under this subsection (a “planning enforcement order”) in relation to that apparent breach of planning control. (2) If a magistrates' court makes a planning enforcement order in relation to an apparent breach of planning control, the local planning authority may take enforcement action in respect of— (a) the apparent breach, or (b) any of the matters constituting the apparent breach, at any time in the enforcement year. (3) “The enforcement year” for a planning enforcement order is the year that begins at the end of 22 days beginning with the day on which the court's decision to make the order is given, but this is subject to subsection (4). (4) If an application under section 111(1) of the Magistrates' Courts Act 1980 (statement of case for opinion of High Court) is made in respect of a planning enforcement order, the enforcement year for the order is the year beginning with the day on which the proceedings arising from that application are finally determined or withdrawn.
Official text (excerpt) · last checked 2026-08-14 · Read the full text in our law library · Verify at legislation.gov.uk
s. 196dOffence of failing to obtain planning permission for demolition of unlisted etc buildings in conservation areas in EnglandIn force
(1) It is an offence for a person to carry out or cause or permit to be carried out relevant demolition without the required planning permission. (2) It is also an offence for a person to fail to comply with any condition or limitation subject to which planning permission for relevant demolition is granted. (3) In this section “ relevant demolition ” means the demolition of a building that— (a) is situated in a conservation area in England; and (b) is not a building to which section 74 of the Planning (Listed Buildings and Conservation Areas) Act 1990 does not apply by virtue of section 75 of that Act (listed buildings, certain ecclesiastical buildings, scheduled monuments and buildings described in a direction of the Secretary of State under that section). (4) It is a defence for a person accused of an offence under this section to prove the following matters— (a) that the relevant demolition was urgently necessary in the interests of safety or health; (b) that it was not practicable to secure safety or health by works of repair or works for affording temporary support or shelter; (c) that the relevant demolition was the minimum measure necessary;
Official text (excerpt) · last checked 2026-08-14 · Read the full text in our law library · Verify at legislation.gov.uk
Town and Country Planning (Scotland) Act 1997
s. 124Time limits.In force
(1) Where there has been a breach of planning control consisting in the carrying out without planning permission of building, engineering, mining or other operations in, on, over or under land, no enforcement action may be taken after the end of the period of 4 years beginning with the date on which the operations were substantially completed. (2) Where there has been a breach of planning control consisting in the change of use of any building to use as a single dwellinghouse, no enforcement action may be taken after the end of the period of 4 years beginning with the date of the breach. (3) In the case of any other breach of planning control, no enforcement action may be taken after the end of the period of 10 years beginning with the date of the breach.
Official text (excerpt) · last checked 2026-08-14 · Read the full text in our law library · Verify at legislation.gov.uk
s. 150Certificate of lawfulness of existing use or development.In force
(1) If any person wishes to ascertain whether— (a) any existing use of buildings or other land is lawful, (b) any operations which have been carried out in, on, over or under land are lawful, or (c) any other matter constituting a failure to comply with any condition or limitation subject to which planning permission has been granted is lawful, he may make an application for the purpose to the planning authority specifying the land and describing the use, operations or other matter. (2) For the purposes of this Act, uses and operations are lawful at any time if— (a) no enforcement action may then be taken in respect of them (whether because they did not involve development or require planning permission or because the time for enforcement action has expired or for any other reason), and (b) they do not constitute a contravention of any of the requirements of any enforcement notice then in force.
Official text (excerpt) · last checked 2026-08-14 · Read the full text in our law library · Verify at legislation.gov.uk
Levelling-up and Regeneration Act 2023
s. 115Time limits for enforcementIn force
(1) In section 171B of TCPA 1990 (time limits), in subsection (1), for the words from “four years” to the end substitute— (a) in the case of a breach of planning control in England, ten years beginning with the date on which the operations were substantially completed, and (b) in the case of a breach of planning control in Wales, four years beginning with the date on which the operations were substantially completed. (2) In that section, in subsection (2), for the words from “four years” to the end substitute— (a) in the case of a breach of planning control in England, ten years beginning with the date of the breach, and (b) in the case of a breach of planning control in Wales, four years beginning with the date of the breach.
Official text (excerpt) · last checked 2026-08-14 · Read the full text in our law library · Verify at legislation.gov.uk
Search our record of UK legislation — retrieved from legislation.gov.uk →
Sources and References
- Planning permission in England and Wales(gov.uk).gov
- Town and Country Planning (General Permitted Development) (England) Order 2015(legislation.gov.uk).gov
- Town and Country Planning (General Permitted Development) Order 1995 (Wales)(legislation.gov.uk).gov
- Town and Country Planning (General Permitted Development) (Scotland) Order 1992(legislation.gov.uk).gov
- Planning (General Permitted Development) Order (Northern Ireland) 2015(legislation.gov.uk).gov
- When is permission required(gov.uk).gov
- Levelling-up and Regeneration Act 2023, section 115(legislation.gov.uk).gov
- Levelling-up and Regeneration Act 2023 (Commencement No.2 and Transitional Provisions) Regulations 2024, regulation 5(legislation.gov.uk).gov
- Lawful Development Certificates(gov.uk).gov
- Town and Country Planning Act 1990, section 171B(legislation.gov.uk).gov
- Town and Country Planning Act 1990, section 171BA(legislation.gov.uk).gov
- Town and Country Planning (Scotland) Act 1997, section 124(legislation.gov.uk).gov
- Planning Act (Northern Ireland) 2011, section 132(legislation.gov.uk).gov
- Town and Country Planning (Scotland) Act 1997, section 150(legislation.gov.uk).gov
- Planning Act (Northern Ireland) 2011, section 169(legislation.gov.uk).gov
- Town and Country Planning Act 1990, section 196D(legislation.gov.uk).gov