Navigating the UK planning system can feel overwhelming for many property owners. Whether you want to build a small extension or construct an entirely new house, understanding the rules is crucial before any work begins.
This guide provides answers to the most common questions about planning permission in the UK. We will explain the planning application process, explore what permitted development rights entail, and help you avoid the potential headaches of building without planning permission. For official guidance and to apply online, the Planning Portal website is an excellent resource for homeowners.
Quick Overview of Planning Permission
Planning permission is the formal approval granted by your local planning authority to allow a proposed development to go ahead. It ensures that new buildings and alterations align with national and local planning policies, protecting the surrounding area and environment.
Not all work requires formal approval. Permitted development allows property owners to perform specific types of development without needing a full planning application. However, if your home is located in a conservation area or an Area of Outstanding Natural Beauty, your permitted development rights are often restricted or removed entirely to preserve the visual impact of the local area.
Do I Need Planning Permission?
According to Ben from Pristine Buildings, “You generally need planning permission if you want to build something new, make a major change to your building, or change the class use of your property.”
Common projects that require planning permission include:
- Building new houses or self-contained flats.
- Large extensions that exceed permitted development limits.
- Significant changes to the existing use of a building.
Conversely, minor internal alterations, small rear extensions, and basic loft conversions often fall under permitted development. If you are unsure, it is wise to seek pre-application advice from your local authority. You can also conduct an online search via the Planning Portal to check local restrictions and property information.
Understanding Permitted Development
Permitted development rights grant pre-approved permission for certain proposed works. National planning policies outline various classes (Class A to Class H) that cover typical residential projects.
- Class A: Covers the enlargement, improvement, or alteration of a house, such as rear or side extensions.
- Class B & C: Covers additions or alterations to the roof, including most loft conversions.
- Class E: Relates to outbuildings, such as sheds, garden offices, and greenhouses.
Permitted Development Limits
While permitted development is generous, strict size and height limits apply. For instance, householders can typically build single-storey rear extensions up to 6 metres for terraced or semi-detached houses, and 8 metres for detached houses.
Outbuildings must not take up more than half the land around the original house and must be single-storey. Be aware of Article 2(3) land restrictions, which limit these rights in protected areas.
Conservation Areas, Listed Buildings, and Trees
If your property is a listed building, most significant internal or external changes require Listed Building Consent from Historic England and your local authority. Doing work on listed buildings without this consent is a criminal offence.
Additionally, you must check for a Tree Preservation Order (TPO). A TPO protects specific trees, groups of trees, or woodlands. If a tree on your site has a TPO, you must apply to the local planning authority for tree work permission before cutting or removing it. Protecting trees and the local ecology is a major part of the planning process.
The Planning Application Process
When your project exceeds permitted development limits, you must submit a formal planning application. The process involves two key stages: validation and determination.
Validation and Determination
During the validation stage, the local authority checks that all necessary documentation is included. You will need to provide detailed architectural drawings, a site plan (often sourced from a mapping team), and potentially a planning statement or sewage plans.
Once validated, the determination stage begins. The target determination date for most minor planning applications is eight weeks. Major or complex full planning applications have a target of thirteen weeks. During this time, the planning officer assesses the application against local planning policies and conducts neighbour consultations.
Role of the Planning Officer
The planning officer reviews your application, visits the site, and gathers feedback from the public and specialists. If the officer raises concerns, you or your planning consultant should respond promptly to answer requests checking specific details. Maintaining polite, clear contact with your planning officer can help resolve issues before they lead to a planning refusal.
New Buildings and Class Use Changes
All new buildings require full planning permission. Furthermore, changing the primary use of a building—known as a change of class use—also requires approval. For example, converting a commercial shop into a residential dwelling represents a significant increase in residential footprint and requires a change of use application.
If you believe your property’s existing use is already lawful, you can apply for a Lawful Development Certificate to officially verify it.
Planning Application Costs and Timescales
The planning permission cost varies depending on the project type. Currently, householder planning applications (for extensions or alterations to existing homes) cost £206 in England. Full planning applications for new dwellings cost £462 per dwelling.
You should also budget for professional fees. Engaging architects or a planning consultant typically ranges from £2,000 to £5,000 for straightforward projects. Additional supporting documents, such as ecological surveys or heritage statements, can add between £500 and £3,000 to your overall permission cost.
Most planning permissions must commence within 3 years of the approval date. If work hasn’t started, the permission automatically lapses.
Conditions, Request Verification, and Compliance
When you receive a decision notice granting permission, it often comes with planning conditions. These might dictate the materials you must use or require tree protection measures during construction.
You must formally submit an application to discharge these conditions before work begins. You can request verification from the council to confirm that all conditions have been met, ensuring full compliance. Building regulations approval is a separate legal requirement; you must ensure your build meets structural and safety building regulations alongside planning rules.
Appeals, Enforcement, and Building Without Permission
If you build without planning permission, the local authority can take enforcement action. They can issue an enforcement notice requiring you to demolish the unauthorised work and restore the property to its original state.
If your application faces planning refusal, you have the right to appeal to the Planning Inspectorate. Common refusal reasons include negative visual impact, overshadowing, or failure to provide necessary ecological surveys. Sometimes, you can submit a retrospective application to approve unauthorised work, though this is risky and not guaranteed to succeed.
Frequently Asked Questions
What is the 50% rule for planning permission?
The 50% rule dictates that you cannot build on more than half the land surrounding the “original house” (as it stood in 1948 or when first built) under permitted development rights. Any extensions, outbuildings, or sheds count towards this 50% limit.
What is the 45-degree rule for overshadowing?
The 45-degree rule is a guideline used by local planning authorities to measure the impact of a proposed extension on a neighbour’s light. An imaginary line is drawn at a 45-degree angle from the centre of the neighbour’s nearest habitable room window. If the new extension crosses this line, it may be refused due to overshadowing.
What is the 2.5 metre rule?
Under permitted development, if an outbuilding or extension is situated within 2 metres of a property boundary, the maximum permitted height of the entire structure is capped at 2.5 metres to protect the neighbour’s amenity.
What are the four types of planning permission?
The main types of planning permission are:
- Full Planning Permission: Detailed consent for a specific design.
- Outline Planning Permission: General approval for the principle of a development, with details (reserved matters) to be agreed later.
- Householder Planning Permission: A simplified application for altering or enlarging an existing home.
- Permitted Development (via Lawful Development Certificate): Confirmation that proposed work does not require a formal planning application.
Do conservatories need planning permission?
Most conservatories fall under permitted development rights and do not need formal planning permission, provided they meet the standard size, height, and boundary limits applicable to single-storey rear extensions.
Do fences need planning permission?
You do not usually need permission to erect a fence if it is less than 1 metre high next to a highway, or less than 2 metres high elsewhere. If your property is a listed building, you will need permission regardless of height.
Conclusion
Understanding the planning application process is the first step toward a successful build. By familiarising yourself with permitted development limits, the planning portal, and local planning policies, you can avoid costly mistakes and enforcement action. Always secure building regulations approval alongside your planning consent, and consider hiring a planning consultant for complex projects.
For the most accurate guidance tailored to your specific property, always contact your local planning authority before starting any construction.