A garden room is a fantastic way to add extra space to your home and the vast majority of are built without planning permission, as they comply with permitted development rights. One of the key factors to consider is the 2.5-metre rule, which determines the maximum height of your garden room when it’s close to a boundary.
What is the 2.5 Metre Rule?
The 2.5-metre rule is part of permitted development rules. It states:
If your garden room is within 2 metres of a boundary, it must not exceed 2.5 metres in height (measured from ground level to the top of the structure).
If it’s more than 2 metres from a boundary, the height limits increase to:
3 metres for flat roofs.
4 metres for dual-pitched roofs (e.g., gable designs).
By ensuring your garden room stays within these limits, you can avoid the need for planning permission and proceed with your project more quickly. We aim to install within 4 weeks.
Tips for Planning Your Garden Room
To make sure your garden room complies with the 2.5-metre rule and other regulations:
Measure accurately: confirm the exact height of your garden room from ground level to the highest point. We offer a free site survey and will do this for you.
Choose the right roof design: flat roofs are ideal for staying under the 2.5-metre limit, while pitched roofs require careful measurements to ensure compliance. A roof lantern doesn’t affect the height and is a great way of flooding the room with light.
Position wisely: if your garden allows, placing the structure more than 2 metres from any boundary gives you greater flexibility with height, we can advise and design this so it meets your requirements exactly.
Check local rules: conservation areas, listed buildings, National Landscapes/Areas of Outstanding Natural Beauty may have stricter regulations.
When Planning Permission is Required
While many garden rooms fall within permitted development rights, there are specific scenarios where planning permission is necessary:
The garden room exceeds the height limits:
2.5 metres if within 2 metres of a boundary.
3 metres for a flat roof if more than 2 metres from a boundary.
4 metres for a pitched roof if more than 2 metres from a boundary.
Your property is in a conservation area, AONB, or is a listed building.
The garden room takes up more than 50% of your garden space (including other outbuildings).
Need Help?
Adding a garden room is an exciting project, but navigating planning rules can feel overwhelming. At Cosy Garden Rooms, we’re here to help! Our team can guide you through the process and ensure your garden room is fully compliant with all regulations.
Contact us today for a free consultation and site survey to get started on your dream garden room.
Contact us here or on 0115 7722715 or, email mark@cosygardenrooms.co.uk
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