Understanding planning laws and regulations, especially for oak frame extensions, can be overwhelming for many homeowners. However, with the increasingly competitive nature of the housing market and endless property prices increases, extending an existing property makes sound financial sense.
Before starting a new building project, it is vital to understand how planning permission and building regulations may apply to your build. Although the two terms are often used together, they govern two very different elements of construction.
Applications for planning permission and oak frame building regulations approval are considered under different laws. Since they are separate pieces of legislation, approval for one doesn’t confer approval for the other.
Planning permission applications are handled by Local Planning Authorities, through devolved power from the government, and follow a strict set of rules outlines in the National Planning Policy Framework. This is used to control the way towns and cities develop through the use and appearance of buildings and land. Highway access, environmental impact, landscaping and conservation are also considered.
Building regulations are a set of standards governing all construction work in the UK. They are used to ensure the safety of occupants living or working in the building and its immediate surroundings.
In this blog we will address some of the most frequently asked questions regarding planning permission for bespoke oak structures.
Do you need planning permission for oak framed extensions?
Using oak as a construction material does not automatically mean you need planning permission. What matters most is the size, design and location of the extension.
In most cases, the materials used are not an issue. However, the extension should usually match the appearance of the existing house. For example, if you are adding an exposed oak frame, it should fit with the style of the property.
Planning rules can vary depending on your home and location, so it is always best to check the latest guidance on the government Planning Portal website.
What size extension can I build without planning permission?
Some extensions can be built under “permitted development” rules, which means you may not need planning permission.
As a general guide:
- Extensions and outbuildings together should not cover more than half of the land around the original house.
- The extension cannot extend beyond the front of the house.
- Rear extensions for detached houses are usually limited to four metres without permission.
Other standalone structures in your garden, such as sheds or garages, may affect what you are allowed to build.
Recent updates to permitted development rules in 2024 and planned updates through 2026 mean homeowners should pay close attention to the latest guidance. In particular, detached houses may qualify for the “Larger Home Extension” prior approval scheme.
Under this scheme, some detached homes can extend up to eight metres to the rear without full planning permission, provided you receive prior approval from the local authority and neighbouring properties are consulted. Semi-detached and terraced homes may be able to extend up to six metres under the same process.
Even when full planning permission is not required, you may still need:
- Prior approval from the council
- Building regulations approval
- Approval if your property is in a conservation area or protected location
We would normally recommend getting a Lawful Development certificate, when opting for the permitted development route, to ensure that the changes being made are legal and within the rules of your local council.
Rules can change, so always check the latest government guidance before starting work.
How big can I make my extension?
Height is just as important as floor area. Without planning permission:
- Side extensions are usually limited to one storey.
- The maximum height is generally four metres.
- Eaves near a boundary must usually be no higher than three metres.
- The extension should not be taller than the highest part of the existing roof.
The roof design should also match the existing property as closely as possible.
If your home is in a conservation area, national park or Area of Outstanding Natural Beauty, stricter rules may apply.
How close to my boundary can I build an extension?
The boundary is normally the edge of your property, such as a fence, wall or hedge.
As a general guide:
- Side extensions on detached homes should usually be at least one metre from the side boundary.
- Single-storey extensions should not be too close to a road at the rear of the property.
- Two-storey extensions normally need more space from rear boundaries.
Boundary rules can be complicated, so it is worth checking with your local planning authority before building.
For extensions of more than one storey, no part should be within seven metres of a boundary to the rear of the house.
Can you double the size of your house with an extension?
You may be able to significantly increase the size of your home, but doubling its size would almost always require planning permission.
Large extensions go beyond normal permitted development rules, so you would need to submit a planning application to your local council. Approval will depend on the design and how it affects neighbouring properties and the surrounding area.
What happens if you build without planning permission in the UK?
Even if your extension plans fall within permitted development, it is possible that details will have to be changed during construction. This can cause what is known as a planning breach and whether deliberate or not can have serious repercussions.
As the homeowner is ultimately responsible for any planning breach, you will be held personally accountable. It is possible to submit a retrospective application, and if this is successful, no harm is done.
If it fails, the council can issue an enforcement order demanding alterations or possibly demolition. Committing a planning breach is not in itself a criminal act, but ignoring an enforcement notice is.
If you fail to comply, you can be prosecuted and fined. If demolition is required and you do not carry out the work yourself, the council is entitled to perform the work itself.
You will then be billed for the cost of work and incur further fines if this is not paid. Failing to plan properly and obtain permission where needed can be an extremely costly mistake.
If you are unsure, visit www.planningportal.co.uk for guides and advice on planning permission.
What are Article 4 Directions?
Permitted development rights are not the same everywhere. In some areas, local councils can remove certain permitted development rights by introducing what is known as an “Article 4 Direction”.
This means you may need planning permission for work that would normally not require it. Article 4 Directions are most common in:
- Conservation areas
- City and town centres
- Areas with historic or architectural importance
- Some urban neighbourhoods where councils want tighter control over development
For example, you may need permission for an extension, external cladding, new windows or changes to the appearance of your home, even if similar work elsewhere would fall under permitted development rights.
Because Article 4 rules vary between local authorities, it is important to check directly with your council before starting any building work.
Vestra Oak specialises in creating oak frames suitable for extensions, garages, oak-framed porches and more. These are supplied as ready-to-build kits for ease of construction with the minimum fuss.
Looking for advice on your project? Contact us, and we will be happy to help.