Do You Need Planning Permission for a Garden Room? Everything You Need to Know

A garden room can be a fantastic addition to your property, providing extra space for a home office, gym, studio, or simply a tranquil retreat. However, before you start building, it's crucial to understand the planning permission requirements to ensure your project complies with local regulations. In many cases, garden rooms are considered permitted development, meaning they do not require planning permission as long as they meet specific criteria. What are the general rules? Do you need planning permission? Read more down below!

What Is a Garden Room?

A garden room is a standalone structure situated within the grounds of a residential property, distinct from the main house. It serves as a versatile space that can be used for various purposes (home / garden office, private gym, guest accommodation etc.), offering a seamless blend of indoor comfort and outdoor tranquillity. Garden rooms are designed to be functional, comfortable, and aesthetically pleasing, providing an extra living area without the need for a traditional extension.

Garden rooms are classed as 'outbuildings'. They're an excellent solution for homeowners seeking additional space without the disruption and expense of extending their main property. With its versatility and potential for customisation, a garden room can be tailored to suit a wide range of needs, making it a valuable addition to any home. Whether used for work, leisure, or accommodation, a garden room enhances the living experience by bringing the comforts of indoor living into the natural beauty of the garden.

Do You Need a Garden Room Planning Permission? Complying with Building Regulations

A garden room is usually considered a permitted development, so you can proceed with construction without planning permission. However, it must adhere to the following planning rules and requirements for garden rooms:

Do I Need to Apply for Planning Permission for Garden Rooms: Size and Height Restrictions

  • Single-Storey Structure: The garden room must be single-storey.
  • Eaves Height: The maximum height at the eaves should be no more than 2.5 metres.
  • Overall Height of Your Garden Building Must Be:
    • Up to 4 metres for a dual-pitched roof.
    • Up to 3 metres for other roof types.
    • If the garden room is within 2 metres of the boundary, the maximum height is limited to 2.5 metres.

Permitted Development Rights: Usage Restrictions

  • How to Use Your Garden Room / Incidental Use: The garden room must be used for purposes incidental to the enjoyment of the main house. This includes uses such as a home office, gym, studio, or guest room, but excludes self-contained living accommodation or commercial use.

Temporary Structures

  • Temporary garden rooms or buildings used for less than 28 days a year generally do not require planning permission.

Important: Keep in mind that all the outbuildings – including extensions, garden sheds, and a proposed garden room – cannot cover more than 50% of the total area of land around your "original" property.

Building Regulations for a New Garden Room

Even if planning permission is not required, your garden room may still need to comply with building regulations, particularly if it will be used as sleeping accommodation or has a floor area exceeding 15 square metres. Key considerations include:

  • Structural Safety: Ensuring the building is structurally sound.
  • Fire Safety: Adequate fireproofing and escape routes.
  • Thermal Performance: Meeting standards for insulation and energy efficiency.
  • Electrical and Plumbing: Complying with safety standards for any electrical or plumbing installations.

Planning Permission for a Garden Room: Exemptions and Special Cases

When a garden room does not fall within permitted development rules? What are the garden room planning restrictions?

Designated Areas:

  • National Parks and AONBs: In National Parks, Areas of Outstanding Natural Beauty (AONBs), and conservation areas, stricter rules apply. Garden rooms must be less than 10 square metres if located more than 20 metres from the house, and additional restrictions may apply.
  • World Heritage Sites: Special restrictions can apply to properties within World Heritage Sites.

Listed Buildings: If your property is a listed building, you will likely need planning permission for any garden room, regardless of size or placement. Listed building consent may also be required to ensure the proposed structure does not negatively impact the historical or architectural significance of the main building.

Proximity to Boundaries: If the garden room is within 2 metres of a property boundary, exceeds 2.5 metres in height, sits in front of the main elevation, or to the side of your house, you will need to get a planning application.

Large Structures: Garden rooms with a floor area exceeding 30 square metres may require planning permission due to their size and potential impact on the surrounding environment.

If you're not sure whether your project falls within permitted development, check with your local planning office. 

How to Build a Garden Room: Tips for a Smooth Planning Process

By understanding the regulations, planning carefully, and seeking professional advice, you can navigate the planning process for your garden room smoothly. A well-planned garden room can enhance your living space and add value to your property, providing a versatile and enjoyable addition to your home.

How to keep all the aspects under control?

  1. Understand the Regulations and Permitted Developments Rights
  2. Plan the Design Carefully: Aesthetics, Size and Scale, Purpose
  3. Consult Professionals
  4. Prepare Thorough Documentation
  5. Submit Your Application Early
  6. Consider Long-Term Use
  7. Manage the Construction Process
  8. Keep Detailed Records
  9. Communicate with Neighbours
  10. Plan for Utilities