Whether used as a home office, gym, studio, or relaxation space, these versatile structures can often be built without formal planning permission — provided certain size and placement rules are followed.

In most cases, garden room cost fall under what is known as permitted development rights, meaning you won’t need to apply for planning permission. However, this only applies if specific conditions are met. Understanding these rules can help you avoid costly mistakes or legal issues down the line.

Key Garden Room Size Limits

To qualify as permitted development, your garden room must meet the following criteria:

• Maximum Height: If the garden room is within 2 metres of your property boundary, the maximum height is restricted to 2.5 metres. If it is further away, it can be up to 4 metres high with a dual-pitched roof or 3 metres with any other type of roof.

• Overall Size: The structure must not occupy more than 50% of the total area of land around the original house. This includes all outbuildings, sheds, and extensions.

• Usage Restrictions: The garden room must not be used as a self-contained living accommodation or as a separate dwelling.

• Location: It must not be placed forward of the principal elevation of your home (the front-facing part). It also should not be located on designated land such as conservation areas, national parks, or areas of outstanding natural beauty without permission.

Practical Considerations

In addition to staying within the size limits, there are a few other important considerations:

• Building Regulations: Even if planning permission isn’t needed, building regulations may apply if the garden room is over 15 square metres and is intended for sleeping accommodation or if it includes electrics or plumbing.

• Foundations and Drainage: Proper foundations, insulation, and drainage systems are essential for a durable and comfortable garden room.

• Neighbour Relations: While not a legal requirement, it's wise to speak to your neighbours before construction to avoid any potential disputes.

Understanding the rules around garden room size permitted and usage helps ensure a smooth installation process. Always check with your local planning authority if in doubt, as rules can vary slightly between regions. With careful planning, a garden room can be a valuable and compliant addition to your property.

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Pecasa Premium Garden Rooms

8 Colonial Way, Watford WD24 4PT, Watford, United Kingdom

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020 8146 2200

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