If you’re planning a SIP extension, one of the first questions you’ll need to answer is whether planning permission is required.
Structural Insulated Panels (SIPS) are an increasingly popular choice for home extensions and garden rooms thanks to their excellent energy efficiency, fast construction times and design versatility.
Planning permission is not always required for SIP panel extensions but this is all dependent on the size of the extension, its location, the property type and how the space will be used.
Homeowners should always consult their local council for information on planning permission before getting started with the build.
In this article we’ll explain what SIP panel extensions are, explore their popular uses, outline when planning permission may or may not be required, cover building regulations and share practical advice to help you plan your project with confidence.
What is a SIP extension?
A SIP panel extension is a type of building extension built using structural insulated panels.
Each panel consists of an insulating foam core embedded between two structural boards which help to regulate the temperature of the build no matter the weather.
SIP panel extensions are a popular choice for both residential extensions and garden rooms due to their high level of thermal performance, their excellent air tightness and their fast build process compared to traditional construction methods.
What are SIP panel extensions commonly used for?
SIP panel extensions are highly versatile and can be designed for a wide range of uses.
Common uses for SIP panel extensions include:
- Home Offices: Ideal for year-round use with minimal heating costs
- Garden Rooms or Studios: Perfect for creative spaces or relaxation areas
- Home Gyms: Comfortable environments with good temperature control
- Self-contained Annexes: Suitable for guest accommodation or multi-generational living
When you may not need planning permission for your SIP panel extension
As planning rules can vary between local authorities, homeowners should always check with their local council before starting any building work.
However, you may not need planning permission if the SIP panel extension:
- Is no more than 5 metres high when built within 2 metres of a boundary
- Is located within 2 metres of a boundary and meets height restrictions
- Has a total floor area of no more than 30 square metres
- Does not cover more than 50% of the total garden space
- Uses fire-resistant materials on any wall that is within 1metre of a boundary
It is important to note that these conditions generally apply to garden room SIP panel extensions and outbuildings.
Different rules may apply to extensions attached to the main house, listed buildings or properties in conservation areas.
For peace of mind, homeowners can apply for a Lawful Development Certificate, which provides written confirmation that planning permission is not required.
When planning permission may be required for your SIP panel extension
In some situations, planning permission will be required for your SIP panel extension.
Planning permission may be required if:
- The SIP panel extension is intended to be used as a self-contained or habitable place, particularly if it includes running water, a kitchen or bathroom.
- The extension is larger than permitted development limits
- The property is a listed building
- The property is located within a conservation area, such as ‘An Area of Outstanding Natural Beauty’
- The extension is built to the side of the property rather than to the rear
If these cases, your local authority will need to assess the design, the scale and the impact of the extension on neighbouring properties and the surrounding area.
If you have any uncertainty, it is always best to consult your local council before proceeding.
What are building regulations?
Building regulations are separate to planning permissions and are mandatory standards for the design, construction and alteration of buildings.
They ensure that buildings are safe, healthy, accessible and energy efficient, covering aspects such as structural integrity, fire safety, ventilation, air quality and energy efficiency.
All SIP panel extensions must comply with building regulations, regardless of whether planning permission is required. This ensures your extension is safe, legally compliant and suitable for long-term use.
How to approach planning permission for your SIP panel extension
When planning a SIP panel extension, it is always best to take a careful and proactive approach.
You should always check your local council’s planning permission guidance to confirm whether your project falls under permitted development rights.
Taking these steps early can prevent delays, reduce the risk of refusals and give you confidence that your SIP panel extension will be legally compliant and built to a high standard.
At Green Leaf Garden Buildings, our team will assist with any planning permission applications to keep your project compliant and straightforward!
Get in touch with a member of our friendly team today to kickstart your SIP panel extension.