Answer
Can I build a pond near a protected tree?
Often yes, but respect the root protection area and any TPO or conservation consent.
In short
Often yes, but you must respect the root protection area of the tree, and if the tree has a Tree Preservation Order or is in a conservation area you need the council consent or notice before any work near it. We design the pond and the groundworks around the roots, sometimes with minimal excavation, so the tree and the pond both survive.
A note
General guidance, not advice. Rules vary by site, and Article 4 directions or conditions can change what applies. Check with your local authority and the Planning Portal.
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