If your London property sits within a conservation area, the trees around it are protected, even if none of them carry an individual Tree Preservation Order. This is one of the most misunderstood areas of tree law: homeowners often assume that “no TPO” means “no restrictions,” then find themselves facing an unlimited fine for unauthorised tree work. This guide explains exactly what conservation area protection means, what you can do without permission, and what requires formal notice first.
How Conservation Area Tree Protection Works
Conservation area tree protection comes from Section 211 of the Town and Country Planning Act 1990, and it’s legally distinct from a Tree Preservation Order. Where a TPO protects a specifically named tree or group of trees that a council has formally designated, Section 211 automatically protects almost every tree within a conservation area boundary, regardless of whether it has ever been individually assessed.
In practice, this means a tree in your garden could be entirely unremarkable, untouched by any council paperwork, and still be legally protected purely because of where it stands. For background on how individually designated trees are protected, see our guide to Tree Preservation Orders for London property developers.
The 75mm Threshold
Protection applies to any tree with a trunk diameter of 75mm or more, measured at 1.5 metres above ground level (or 100mm where the work is thinning to benefit the growth of neighbouring trees). Below that threshold, a tree falls outside the notification requirement altogether. For multi-stemmed trees, every stem must be under the threshold for the exemption to apply, a single stem over 75mm brings the whole tree into scope.
What You Must Do Before Carrying Out Works
If you want to fell, top, lop, or significantly prune a protected tree in a conservation area, you must submit a Section 211 notice to your local planning authority at least six weeks before any work begins. This isn’t a permission application in the same sense as a TPO consent, the council can’t formally approve the work but the notice period gives them the opportunity to assess the tree and decide whether to serve a TPO on it before work starts.
According to government guidance on conservation area trees, if the council doesn’t respond within the six-week window, you’re free to proceed with the notified works. If they do object, they make a TPO instead, which then governs what you can and can’t do going forward.
What the Section 211 Notice Must Include
Your notice needs to clearly describe the proposed work, including the type of work (felling, crown reduction, pruning), the location of the tree, and enough detail for the council to identify exactly which tree is affected. Vague descriptions such as a general intention to “top” or “lop” a tree are typically rejected, since there are many different ways to carry out that kind of work and the council needs precision to make an informed decision.
What's Exempt From Notification
Not every piece of tree work in a conservation area requires a six-week notice. Common exemptions include:
- Trees with a trunk diameter under 75mm (or 100mm for thinning)
- Removing dead branches from an otherwise living tree
- Work on a tree that is dead, dying, or dangerous, most councils still require five working days’ prior written notice unless there’s an immediate risk of serious harm
- Pruning of fruit trees being cultivated for fruit production
- Work already covered by a granted planning permission
- Cutting or removing garden hedges and shrubs (these fall outside tree protection rules entirely)
If you’re unsure whether your situation qualifies for an exemption, it’s worth getting professional confirmation before proceeding as the burden of proving an exemption applied falls on you, not the council, if the work is later questioned.
What Happens If You Don't Comply?
Carrying out unauthorised work to a protected tree in a conservation area is a criminal offence, prosecutable in the Magistrates’ Court or Crown Court, and can result in an unlimited fine. Beyond the legal penalty, councils can also issue a tree replacement notice, requiring you to plant a replacement tree of a size and species they specify – an obligation that can run for years if the replacement fails to establish.
Conservation Areas and Planning Applications
If you’re planning building work as well as tree work, conservation area status raises the bar further. Where a tree near your development site sits within a conservation area, planning authorities will generally apply the fuller BS5837 survey and assessment requirements, regardless of whether your application would otherwise qualify for a lighter-touch householder process. Our guide on BS5837 tree surveys for London planning applications explains what’s typically required.
Checking If You're in a Conservation Area
Conservation area boundaries vary street by street in London, and it’s entirely possible for one side of a road to be covered while the other isn’t. Every London borough publishes a conservation area map, usually searchable by postcode through the council’s planning portal, and it’s worth checking this before commissioning any tree work, however minor it may seem.
Get Clarity Before You Act
Because conservation area protection applies automatically and broadly, the safest approach for any homeowner planning tree work is to confirm the tree’s status and prepare the correct Section 211 notice before any cutting takes place. Getting this wrong isn’t just a paperwork issue, it carries real legal and financial risk.
If you need help establishing whether trees on your property are protected, or want a professional report to support a Section 211 notice or planning application, our team can carry out a full assessment and prepare the documentation your council requires. Find out more about our tree survey and reporting services or get in touch to discuss your property.