Permitted Development rights are a national grant of planning permission for specified types of development. The important question is not simply whether a project is called an extension, loft conversion or outbuilding; it is whether the property is eligible and whether the actual proposal meets every relevant limitation and condition in the applicable class.
This guide is an overview of the householder framework in England. It explains eligibility, the main Part 1 classes, Prior Approval, Lawful Development Certificates and Article 4 directions. Detailed dimensions and project-specific tests stay with the dedicated extension, loft, garage and garden-building guides rather than being duplicated here.
Local planning authorities apply the national legislation to individual properties, but a borough name does not create a separate set of TCM planning rules. Always check the property planning history, any Article 4 direction or condition, designated-area status and the current national guidance before relying on PD.
Scope of this page: householder permitted-development rights under the GPDO, the main Part 1 classes, class-specific Prior Approval, Lawful Development Certificates, Article 4 directions and authority/property checks. It is an overview, not a substitute for the detailed rules or project-specific planning advice.
What Permitted Development Rights Actually Are
Householder Permitted Development rights are set out in Part 1 of Schedule 2 to the Town and Country Planning (General Permitted Development) (England) Order 2015, as amended. A proposal benefits from PD only if the relevant property is eligible and the development meets every applicable limitation and condition.
Ordinary householder rights are primarily for eligible dwellinghouses. They do not generally apply to flats or maisonettes, and some houses created through specified change-of-use permitted-development rights also have restricted householder rights. Planning conditions, Article 4 directions and designated-area rules can further alter what can be done without an application.
PD is not Building Regulations approval
A project can be permitted development and still require Building Regulations approval, competent-person certification or other technical compliance. Planning and Building Regulations are separate systems. See our Building Regulations guide.
PD is property- and proposal-specific
Check the planning history, relevant PD class, any Article 4 direction or planning condition, designated-area status and previous development before relying on the national right. Where there is doubt, use current local-authority or professional advice and consider formal lawful-development evidence.
The Five Classes That Matter for Homeowners
Part 1 contains several classes relevant to household projects. The outline below explains what each class generally covers. The detailed dimensional and design tests belong on the project-specific planning guides because they must be applied to the actual house and proposal.
Class A can cover specified enlargements, improvements and alterations to an eligible house. The current limits and conditions depend on the original house, previous enlargement, position, height, storeys, materials, designated-land status and other project details.
For extension dimensions, larger-home Prior Approval and project-specific restrictions, use the House Extension Planning Permission guide.
Class B can provide rights for specified roof enlargements to eligible houses, including some dormer and hip-to-gable proposals. Volume, roof height, principal-elevation, materials and other conditions must all be checked, along with previous roof enlargement and any property-specific restriction.
Use the
Class C covers certain other alterations to the roof of an eligible house where the relevant limitations and conditions are met. It is separate from Class B roof enlargement, and other technologies such as solar equipment can fall under different parts of the GPDO.
Check the exact work and relevant class rather than assuming all roof work shares one permitted-development rule.
Class D provides rights for qualifying porches outside an external door of an eligible house, subject to specific size, height and highway-boundary tests. Use the current national guidance for the actual design before relying on the class.
Class E can cover specified buildings or structures required for purposes incidental to the enjoyment of an eligible house. Height, position, site coverage, designated land and intended use can all matter.
Use matters: an outbuilding intended as a separate self-contained dwelling is not simply an incidental Class E garden building. Check the actual residential use and planning route before design or construction.
Prior Approval: The Middle Ground Between PD and Full Planning
Prior Approval is not a single generic householder application. It is a procedure attached to specified permitted-development classes, under which the local planning authority considers the matters defined by that class before the development proceeds.
Larger home extensions are one familiar householder example, but whether Prior Approval applies, what information is needed, the current fee and the decision procedure should be checked against the relevant class and current Planning Portal/local-authority guidance.
| Route | What it means | Next check |
|---|---|---|
| Permitted Development without Prior Approval | The relevant class grants planning permission if every limitation and condition is satisfied. | Confirm the property and proposal against the current class. |
| Permitted Development with Prior Approval | The class grants permission subject to a prescribed authority procedure and specified matters. | Check the class-specific procedure, information, fee and timing. |
| Planning Application | Used where the proposal does not benefit from the relevant PD right or another planning route is required. | Use current application guidance and fees for the proposal. |
Lawful Development Certificates: Formal Evidence of Lawfulness
A Lawful Development Certificate is a formal local-authority decision on the lawfulness of proposed or existing development. It is different from planning permission: the authority is deciding whether the development is lawful on the evidence and planning law that apply.
An LDC is not mandatory for every permitted-development project. It can be useful where formal evidence of lawfulness matters, but the evidence required and fee depend on the type of certificate and current rules. Check the current Planning Portal or local-authority process rather than relying on an old fixed fee or assuming an LDC guarantees a future sale, mortgage or valuation outcome.
Decision point: consider an LDC when formal confirmation of lawfulness is materially useful to the project or property records. It should not be presented as a universal pre-start requirement.
Article 4 Directions: Where National Rights Can Be Withdrawn
An Article 4 direction allows a local planning authority to withdraw specified permitted-development rights in a defined area or for defined properties. It does not automatically remove every PD right, and a conservation area does not by itself mean that all development needs a planning application.
Check the current direction, map, schedule and wording for the exact property and the class of work proposed. Planning conditions on an individual permission can also restrict rights independently of Article 4.
Property check: planning history, designated-area status, Article 4 directions and conditions should be checked for the address before relying on a permitted-development route.
Local Authority Checks in Hertfordshire and North London
The national GPDO framework is the starting point, but local records determine whether an individual property is affected by an Article 4 direction, conservation/listed-building context, planning condition or previous development. The cards below are portal/check reminders, not TCM claims about how a council normally decides applications.
Hertsmere Borough Council
Borehamwood · Elstree · Radlett · Potters Bar
London Borough of Barnet
Barnet · Finchley · Hendon · Mill Hill · Totteridge
London Borough of Harrow
Harrow · Stanmore · Pinner · Wealdstone · Kenton
Watford Borough Council
Watford · Oxhey · Nascot Wood and nearby areas within the authority
How TCM Can Support a Permitted-Development Project
TCM can discuss the proposed building work and can coordinate with appointed designers, planning professionals or other specialists where that responsibility forms part of the agreed project scope. This page does not state that every TCM enquiry includes a free PD assessment, planning application, LDC or Prior Approval service.
Before construction is treated as permitted development, the project team should establish the property's eligibility, the relevant class, any planning-history restriction, Article 4 direction or designated-area issue, and whether formal lawful-development evidence or a different planning route is appropriate.
Useful information to establish before relying on PD
- Property type and planning history
- The Part 1 class relevant to the actual work
- Previous extensions or roof enlargements that affect the class tests
- Any Article 4 direction, planning condition or designated-area restriction
- Whether Prior Approval is part of the relevant class
- Whether an LDC or other formal planning evidence is useful
- Separate Building Regulations, Party Wall and other project requirements
Related Guides
House Extension Planning Permission
When a house extension may need a planning application and the project-specific checks that affect the route.
Building Regulations Guide
Planning and Building Regulations are separate regimes; check the Building Regulations route for the actual work.
Garage Conversion Planning Permission
Planning checks for garage conversions, external alterations, restrictions and separate residential use.
What Is a Party Wall Agreement?
When the Party Wall etc. Act may apply independently of the planning route.
House Extensions
House-extension building work with coverage and project responsibilities confirmed for the individual enquiry.
Loft Conversions
Loft-conversion building work; the planning route depends on the property and actual roof proposal.
Can I Convert My Garage?
Garage-conversion feasibility, intended use, approvals and project-specific constraints.
Frequently Asked Questions
Permitted Development rights are a national grant of planning permission for specified development that meets every relevant limitation and condition in the GPDO. The ordinary householder rights apply to eligible houses rather than flats/maisonettes, and the position can be affected by planning conditions, Article 4 directions, designated land, previous development or the way the house was created. Planning and Building Regulations are separate regimes.
Class A can cover specified enlargements, improvements or alterations to an eligible house, but the detailed limits and conditions depend on the property and proposal. Larger rear extensions can also involve a class-specific prior-approval procedure. Use the dedicated house-extension planning guide for the current dimensional tests rather than relying on a simplified table on this overview page.
Some householder rights remain available on designated land while others are more restricted. Conservation-area status does not remove every PD right automatically. Article 4 directions and planning conditions can also withdraw or restrict particular rights. Check the exact property, the current direction/condition and the relevant class before deciding that an application is or is not required.
A Lawful Development Certificate is a formal local-authority decision on whether proposed or existing development is lawful. It is not mandatory for every PD project, but it can provide formal evidence where certainty is useful. The evidence requirements and current fee depend on whether the certificate concerns proposed or existing development, so check the current Planning Portal or local-authority procedure rather than relying on an old fixed fee.
Prior Approval is a procedure attached to specified permitted-development classes where the local planning authority considers the matters defined by that class before development proceeds. It is not a generic planning-light route for every householder project. Whether it applies, the information required, fee and determination procedure depend on the relevant class and current rules.
Yes. A local planning authority can use an Article 4 direction to withdraw specified permitted-development rights, and planning conditions can also restrict rights for an individual property or development. The effect depends on the exact wording and scope of the direction or condition, so check the property records rather than assuming all PD rights have been removed.
Start with the property's eligibility and planning history, identify the class relevant to the actual work, then check every limitation and condition plus any Article 4 direction, planning condition or designated-area restriction. The Planning Portal and GOV.UK householder technical guidance provide the national framework. Where formal certainty is important, consider the appropriate lawful-development certificate route or project-specific professional/local-authority advice.
Planning Enquiries
Contact TCM to discuss your project. Any planning assessment, professional input, authority submission or written planning advice included by TCM remains project-specific rather than a universal service.