Resource guide | 9 min read
Permitted Development Rights UK Guide 2026 — What You Can Build Without Planning Permission
Permitted development rights (PDR) allow UK homeowners to carry out certain types of building work without applying for full planning permission. Understanding what you can and cannot build under permitted development can save you thousands of pounds and months of waiting. This guide covers the key permitted development rules for England in 2026. Crown Architecture & Structural Engineering Ltd offers expert permitted development advice and lawful development certificate applications across London, Kent, Essex, Surrey, and Hertfordshire. Call +44 7950 114633 or visit crownarchitecture.co.uk.
What Are Permitted Development Rights?
Permitted development rights are a set of national planning rules that grant automatic planning permission for certain types of development, without the need to make a formal planning application. They are set out in the Town and Country Planning (General Permitted Development) (England) Order 2015 (as amended).
Not all properties have permitted development rights. Rights can be removed by:
- Article 4 Directions (typically in conservation areas or Areas of Outstanding Natural Beauty)
- Conditions on previous planning permissions
- Listed building status
Key Permitted Development Categories for Homeowners
Permitted development is divided into classes covering different types of work. The most common categories for homeowners are summarised below.
1. Rear Extensions (Class A)
Single storey: rear extensions can project from the rear wall of the original house, with limits depending on whether the property is semi-detached, terraced, or detached.
- Up to 3 metres from the rear wall of the original house (semi-detached and terraced)
- Up to 4 metres from the rear wall (detached houses)
- Maximum height: 4 metres (with eaves up to 3 metres if within 2 metres of boundary)
- Double storey: up to 3 metres from the rear wall of the original house
- Double storey must be at least 7 metres from the rear boundary
- Double storey cannot be higher than the ridge of the original roof
- Neighbour Consultation Scheme (Prior Approval) allows larger single storey rear extensions up to 6 metres (semi/terraced) or 8 metres (detached), subject to neighbour consultation
2. Side Extensions (Class A)
Side extensions are more restricted than rear extensions under permitted development.
- Maximum width: half the width of the original house
- Only single storey under permitted development (double storey side extensions require full planning permission)
- Must not extend beyond the front wall of the original house
3. Loft Conversions (Class B)
Loft conversions are permitted development within volume and design limits.
- Additional volume: up to 40 cubic metres (terraced houses) or 50 cubic metres (detached and semi-detached)
- Must not exceed the existing ridge height
- No raised platforms, balconies, or verandas at roof level
- Must be set back 20cm from the eaves
4. Outbuildings and Garden Buildings (Class E)
Garden buildings, sheds, and home offices can usually be built under permitted development within strict limits.
- Single storey only
- Maximum height: 4 metres (dual pitched roof) or 3 metres (other)
- If within 2 metres of a boundary: maximum height 2.5 metres
- Must not cover more than 50% of the garden (including all existing outbuildings)
- Must not be in front of the principal elevation
- Cannot be used as a separate dwelling
5. Porches (Class D)
Porches have their own permitted development class with modest size limits.
- Ground floor only
- Maximum floor area: 3 square metres
- Maximum height: 3 metres
- Must be at least 2 metres from a highway
6. Garage Conversions (Class A)
Converting an existing garage into a room is usually permitted development, provided:
Check local conditions — some councils remove PD rights for garage conversions in certain areas.
- The external dimensions of the building do not change
- It is not used as a separate dwelling
When Permitted Development Rights Do NOT Apply
Your property may not have permitted development rights if:
- Listed buildings — any work to a listed building requires listed building consent in addition to (or instead of) planning permission
- Conservation areas — Article 4 Directions in conservation areas often remove PD rights for front and side extensions, cladding, and roof alterations
- Article 4 Directions — councils can designate Article 4 Direction areas beyond conservation areas, removing PD rights
- Flats and maisonettes — PD rights under Class A–E do not apply to flats or maisonettes
- Conditions on planning consents — a previous planning permission may have removed PD rights for the site
- New build properties — developers sometimes remove PD rights as a planning condition
- National parks and AONBs — stricter rules apply
How to Check If Your Project is Permitted Development
Follow these steps before assuming your project falls within permitted development.
- Review the Technical Guidance — The Planning Portal provides detailed technical guidance at gov.uk and planningportal.co.uk
- Check for Article 4 Directions — Contact your local planning authority or check their website
- Measure carefully — PD rules are precise. Being even slightly over the limits requires full planning permission
- Get a Lawful Development Certificate (LDC) — The safest way to confirm your development is permitted
Lawful Development Certificates (LDC)
Even if your development is permitted development, you should consider obtaining a Lawful Development Certificate from your local council. An LDC confirms in writing that the proposed works are lawful.
Cost: Typically £103 for an LDC application in England (2026 fee), plus architect/consultant fees.
Crown Architecture handles LDC applications across London and the South East. Visit crownarchitecture.co.uk/planning-consultant.
- Gives certainty and peace of mind
- Protects you when selling the property (buyers' solicitors and mortgage lenders often ask for it)
- Useful if there is any doubt about whether works fall within PD limits
- Provides legal evidence if the council disputes the works later
Permitted Development vs Full Planning Permission — Comparison
Permitted development and full planning permission differ across application requirements, fees, decision times, and flexibility.
Permitted development: no formal application is needed (just an LDC recommended), the LDC fee is £103, decision time is around 8 weeks, neighbour objections cannot stop it (unless prior approval applies), national rules are fixed, and it is best for standard extensions within size limits.
Full planning permission: a householder application is required, the council fee is £206, decision time is around 8 weeks, neighbour objections can affect the outcome, design flexibility is greater, and it is best for extensions over PD limits or in restricted areas.
Party Wall Act and Permitted Development
Even if your extension is permitted development, you may still need to comply with the Party Wall etc. Act 1996 if the works affect a shared wall or are near the boundary.
Crown Party Wall Surveyors can advise and handle party wall notices. Visit crownpartywall.co.uk.
- Rear extension close to or on the boundary with a neighbour
- Excavations for foundations within 3 metres (or 6 metres in some cases) of a neighbour's structure
Checklist: Permitted Development or Full Planning?
Run through this quick checklist before instructing drawings or starting work.
- Is the property a flat or maisonette? (If yes, PD does not apply for extensions)
- Is the property listed? (If yes, listed building consent required)
- Is there an Article 4 Direction in your area?
- Is the extension within the permitted size limits?
- Is the height within permitted limits?
- Does the extension use the same or similar materials as the original house?
- Is the extension set back from the eaves (loft conversion)?
- Is the total area of extensions within cumulative limits?
- Have you obtained (or do you plan to obtain) a Lawful Development Certificate?
Related routes
Continue to the service pages most relevant to this topic
These links move readers from research into the service pages that best match the project stage they are in now.
Planning consultant support
Help with permitted development and planning.
Architectural drawings
Planning drawing packages.
Lawful Development Certificate
LDC application support to formally confirm PD lawfulness.
Project pricing
Indicative fees.
FAQ
Questions homeowners often ask next
Do I need planning permission for a permitted development extension?
No — that is the point of permitted development. If your project falls within the size, height, and design limits set out in the General Permitted Development Order, you do not need to submit a full planning application. However, a Lawful Development Certificate is strongly recommended to confirm the works are lawful.
How do I know if my house has permitted development rights?
Check whether your property is listed, in a conservation area, or covered by an Article 4 Direction. Look for conditions on previous planning permissions that may have removed PD rights, and remember that flats and maisonettes do not have PD rights for extensions. Your local planning authority can confirm any restrictions.
What is a Lawful Development Certificate and do I need one?
A Lawful Development Certificate (LDC) is a formal council document confirming that proposed or existing works are lawful under permitted development. It is not legally required, but it gives certainty, helps with sales and mortgages, and protects you if the council later disputes the works. The 2026 application fee is typically £103.
Can I build a double storey rear extension under permitted development?
Yes, in many cases. A double storey rear extension can project up to 3 metres from the original rear wall, must be at least 7 metres from the rear boundary, and cannot exceed the original roof ridge. It must not be on a flat, maisonette, or in a restricted area, and design and materials must match the existing house.
Does the Party Wall Act apply to permitted development works?
Yes. The Party Wall etc. Act 1996 is separate from planning permission. Even if your extension is permitted development, you may still need to serve party wall notices if works affect a shared wall, build on the boundary, or involve excavations within 3 metres (sometimes 6 metres) of a neighbour's structure.
What happens if my project exceeds permitted development limits?
If your design exceeds the size, height, or location limits, you will need to apply for full planning permission instead. Going even slightly over the limits removes permitted development status, so accurate measurement and a careful design review are essential before starting work.
Ready to talk through your project?
Unsure if your project is permitted development?
Crown Architecture & Structural Engineering Ltd advises homeowners on permitted development rights, Article 4 restrictions, and Lawful Development Certificate applications across London and the South East. Call +44 7950 114633 or email info@crownarchitecture.co.uk for a clear assessment of your project.