In England, a planning application is not automatically required for every building project. First establish whether the proposal is “development” in planning law. Then check whether a permitted development right, local development order or another existing grant already gives permission. If no grant covers the precise work, use the local planning authority’s application process. Where the position remains uncertain, a lawful development certificate is the formal route to a legally binding answer.
The result depends on the address, design, dimensions, proposed use, planning history and local restrictions. A generic online checker cannot safely determine a site-specific outcome without those details.
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Check the scope before you start
This guide applies to England. Planning systems and local procedures differ in Scotland, Wales and Northern Ireland, so use the relevant national guidance if the property is elsewhere.
The body responsible for planning decisions is your local planning authority (LPA), usually the council or unitary authority covering the property. The LPA’s maps, planning register and local policies can reveal restrictions that do not appear in a general description of the work.
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Do not begin with the question “Do I need a planning application?” There are two separate questions:
- Does the proposal amount to development under planning law?
- If it is development, is planning permission already granted by a permitted development right, a local order or an earlier decision?
Only after those checks should you decide whether to submit an application.
1. Describe the proposal precisely
Write down the facts that the legal tests will use. A vague description such as “an extension” or “a new room” is not enough to test a right accurately.
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Record the physical work
- What will be built, demolished or structurally altered?
- Its length, width, height, floor area and position on the plot.
- Its distance from boundaries, roads and the original building, where relevant.
- Materials, roof form, windows, doors and any change visible from outside.
- Whether the work is temporary or permanent.
Record the proposed use
State the existing use and the intended use. A change from a dwelling to another use, a change within a business, or subdivision into separate homes can raise different questions. Note who will occupy or operate the space, how many units will result and whether access, parking, deliveries, noise or other activity will change.
Record the site context
- The full address and a plan identifying the application site.
- Whether the building is listed or lies in a conservation area, National Park, the Broads, a National Landscape or a World Heritage Site.
- Any protected trees, heritage designations or other environmental constraints you know about.
- Earlier planning permissions, conditions, refusals, appeals or certificates affecting the property.
Keep drawings, photographs and measurements together. The same information will be needed if you ask the council for advice, apply for a certificate or submit a planning application.
2. Decide whether the proposal is “development”
Government guidance summarises the test in section 55 of the Town and Country Planning Act 1990. Development generally includes building operations, most demolition, engineering operations, mining operations, material changes of use and subdivision of a dwelling into two or more separate dwellinghouses.
| Question | What it can include |
|---|---|
| Building operations | Construction, structural alterations and other work that changes a building or land. |
| Demolition | Most demolition operations, subject to the legal treatment of the particular work. |
| Material change of use | A change in how land or a building is used that is material in planning terms. |
| Engineering or mining operations | Works to land, ground levels or mineral extraction that fall within the statutory definition. |
| Subdivision of a dwelling | Dividing one dwelling into two or more separate dwellinghouses. |
Some activity is not development. Government examples include interior alterations, except for the stated retail-mezzanine exception, operations that do not materially affect external appearance and movement between uses in the same use class. Those examples are not a blanket exemption: the exact facts and any applicable legislation still control the result.
For example, removing a non-structural internal partition may raise a different planning question from changing a shopfront, adding an external flue or creating a separate dwelling. If work combines internal and external elements, test each element rather than assuming the least restrictive part determines the whole project.
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3. Look for an existing grant of planning permission
Development normally needs planning permission, but permission can already exist without a fresh application.
Permitted development rights
The General Permitted Development Order (GPDO) grants planning permission nationally for specified categories of building work and use changes. Householder rights are set out principally in Part 1 of Schedule 2 to the GPDO 2015, as amended. A right applies only when the proposal fits its category and every relevant limitation and condition.
“Permitted development” therefore means permission has been granted by the order; it does not mean that the project is outside planning law or that every administrative step can be skipped.
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A local development order, neighbourhood development order or Community Right to Build Order can grant permission for defined development in a specified area. Check the council’s published orders and maps rather than relying on a national rule alone.
Earlier permissions and conditions
Read the property’s planning history, including the approved plans and every condition. An earlier permission may authorise the work, but a condition can also remove or restrict permitted development rights. The fact that a neighbour carried out similar work does not establish that your property has the same permission or planning history.
4. Test the exact permitted development right
Once you have identified a possible right, compare the proposal against the current wording and technical guidance point by point.
Match the category
Identify the relevant GPDO part and class. A right for a householder extension is not interchangeable with a right for an outbuilding, roof alteration, agricultural operation or change of use. A similar appearance does not prove that the same class applies.
Check every limitation and condition
Permitted development rights contain category-specific controls on matters such as size, height, location, use, materials and the relationship to the original building. Some rights treat designated land, principal elevations, protected trees or previous additions differently. Use the current amended GPDO and the associated technical guidance for the precise category.
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Do not round measurements up or down to make a project fit. Draw the existing and proposed footprints, elevations and boundaries so that the council can see how each limit is met. If the right requires a particular material, roof treatment, set-back or use, record that requirement in the design brief.
Compare the two possible routes
| Issue | Permitted development route | Planning application route |
|---|---|---|
| Legal basis | A national or local order already grants permission if its category, limits and conditions are met. | The LPA decides an application for the specific proposal. |
| Design test | The work must fit the precise right; exceeding one limitation can take it outside the grant. | The proposal is assessed under the development plan and other material planning considerations. |
| Local restrictions | Protected-area controls, Article 4 directions and earlier conditions can remove or narrow the right. | Local policies and site constraints remain relevant to the decision. |
| Advance council step | Some categories require prior approval or notification before work starts. | The application must be submitted and determined before development begins, unless another lawful route applies. |
| Certainty | Compliance is your responsibility unless confirmed through a certificate or other formal decision. | The decision notice states whether permission is granted and any conditions attached. |
Neither route is universally faster or better. The correct route is the one supported by the law and the proposal’s facts.
5. Check local and protected-area restrictions
A national permitted development right can be limited or excluded by the property’s location.
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Designated areas
Rights may be narrower in conservation areas, National Parks, the Broads, Areas of Outstanding Natural Beauty (now generally called National Landscapes) and World Heritage Sites. The restriction depends on the particular right, so do not assume that a designation automatically bans all permitted development or that it has no effect.
Article 4 directions
An Article 4 direction can remove specified permitted development rights in a defined area. The council should publish the direction, its map and the classes of development affected. Check whether the property lies inside the mapped area and whether the proposed work is one of the classes removed.
Conditions on earlier permissions
A planning permission can contain a condition removing permitted development rights for the site. Read the original decision notice and approved plans, not just the application title. The condition may apply to the whole property or to a particular part of it.
How to investigate
- Open the LPA’s planning constraints or interactive map and search the full address.
- Check conservation-area, National Park, National Landscape, World Heritage Site and other designation layers.
- Search the planning register for the property and read decision notices and conditions.
- Find any Article 4 direction and verify its boundary and affected development classes.
- Ask the LPA to clarify anything the map or register does not make clear.
6. Find out whether prior approval or notification is required
Some permitted development categories require an advance notification or a prior-approval application. In those cases, the right may still grant planning permission in principle, but the authority must have an opportunity to consider the matters specified by that category before work starts.
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1Clear out junk files and repair common Windows errors2Scan for outdated or missing drivers - takes under a minute3Repair Windows errors before they cause bigger problemsThe category determines what the LPA may examine and which procedure applies. Depending on the right, the issues can include transport, flooding, contamination, design, noise, siting or neighbour impacts. Do not treat “permitted development” as permission to begin immediately.
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Read the procedural part of the applicable GPDO class and follow its notice, plans and timing requirements. Keep proof of what was submitted and when. If the authority requests prior approval, wait for the outcome or the legally applicable period to pass before starting, as appropriate to that category.
7. Check consents that are separate from planning permission
Planning permission is only one part of the approval picture. A project can be permitted development and still need another consent.
- Building regulations: Structural safety, fire safety, insulation, ventilation, drainage and accessibility may require building-control approval or a completion certificate.
- Listed building consent: Works affecting a listed building or its special architectural or historic interest can require this separate consent, even where planning permission is not needed.
- Protected tree consent: Works to a tree covered by a tree preservation order or within a conservation area may need the relevant notice or consent.
- Advertisement consent: Signs and advertisements can be controlled separately from the building or use they identify.
- Hazardous substances consent: Storage or use of controlled hazardous substances can trigger a distinct regime.
- Environmental permits and other licences: Activities affecting emissions, waste, water or other regulated matters may require approvals from the appropriate authority.
Ask each responsible authority what it needs. A building-control approval does not legalise development that required planning permission, and planning permission does not replace building regulations.
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Contact the LPA with a clear description, location plan, photographs, drawings, dimensions, proposed use and relevant planning-history references. Ask which permitted development class or application route the authority considers relevant and whether local restrictions or prior approval apply.
An officer’s informal view can help you understand the issues, but it is not the same as a binding determination. Keep written correspondence and ask the council to identify any point that remains unresolved.
Use a lawful development certificate for formal certainty
If it is not clear whether works are covered by permitted development rights, government guidance says you can apply for a lawful development certificate for a legally binding decision from the LPA. The certificate route is used to establish whether a proposed or existing use or operation is lawful; it is not a substitute for planning permission where the proposal is not lawful under an existing grant.
Submit the accurate drawings, site location plan, measurements, planning-history information and a precise description of the proposed operation. The decision will turn on the evidence and the law at the relevant date. A certificate can provide a document for your records, future buyers and lenders, but it does not grant other consents such as listed building consent or building-regulations approval.
9. A practical decision checklist
Work through this sequence before appointing contractors or ordering materials:
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- Define it: Write the work, dimensions, location, appearance and intended use in measurable terms.
- Classify it: Decide whether it is building work, demolition, an engineering operation, a material change of use, subdivision or another form of development.
- Search permissions: Review the property’s planning register, approved plans and conditions.
- Identify a right: Find the exact GPDO class or local order that might grant permission.
- Test compliance: Check every size, height, siting, use, design and materials limitation and condition.
- Check the site: Review designations, Article 4 directions and conditions that remove rights.
- Check procedure: Establish whether prior approval, notification or another advance step is required.
- Check other regimes: Contact building control and investigate listed buildings, trees, advertisements, hazardous substances and environmental permits.
- Get certainty: Ask the LPA for clarification, or apply for a lawful development certificate when a legally binding answer is needed.
- Keep the record: Retain plans, measurements, correspondence, certificates, notices and decision documents before work begins.
10. What can happen if you start without required permission?
If planning permission was required and development proceeds without it, the LPA can take enforcement action. The public GOV.UK guidance explains that an enforcement notice can require changes to be undone. Ignoring such a notice is illegal, although an appeal may be available.
Stopping work after a concern is raised does not automatically resolve the breach. Contact the LPA promptly, obtain advice on the available application or certificate route and do not assume that time alone makes an unauthorised project acceptable. Keep all notices and observe any deadlines stated in them.
Examples of how the checks work
A proposed house extension
Measure the extension, show its position relative to the house and boundaries, and identify the original building and any earlier additions. Test the relevant householder right in Part 1 of Schedule 2 to the GPDO 2015, including its limits and conditions. Then check whether the property is in a designated area, inside an Article 4 area or subject to a condition removing the right. If the design falls outside the right, prepare for a planning application rather than treating a neighbour’s extension as a precedent.
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Determine whether the work is genuinely internal and whether it changes the use, creates separate dwellinghouses or affects the external appearance. Interior alterations can be outside the statutory definition of development, but the stated retail-mezzanine exception and other facts can change the analysis. Building regulations may still apply.
A change of use
Compare the existing and proposed uses and assess whether the change is material. Check whether the movement is within the same use class, covered by a GPDO change-of-use right or controlled by a local order. Consider operational effects such as deliveries, noise, parking and opening hours, and check whether prior approval is required.
Work to a listed building
Run the planning-permission test and the listed-building-consent test separately. Even if a permitted development right appears to cover the external work, listed building consent may still be required for work affecting the building’s special interest.
When professional advice is sensible
Consider qualified planning advice for a project involving several uses, a heritage asset, a disputed planning history, a complex Article 4 direction, substantial engineering work, enforcement action or a valuable development decision. Give the adviser the same measured description and documents you would give the LPA. Professional advice can explain risk, but only the appropriate formal decision or certificate provides the legal status described by law.
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Keep the rules current
The central government guidance on when permission is required was updated on GOV.UK on 26 July 2023, with paragraph-level revision dates that vary. The GPDO can be amended, and local restrictions and planning histories can change. Recheck the current amended order and the LPA’s property-specific information immediately before relying on a permitted development right.
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