Extending near a protected tree without losing consent
A protected tree does not stop an extension, but it does decide where the walls go. Here is the order to work through before the drawings are finished.
A protected tree near your house rarely stops an extension. It decides where the walls go, what the foundations cost and how long the programme runs. If you find out about the protection after the drawings are finished, all three of those decisions get made twice.
Work through the tree question early, in this order: is it protected, how big is its root protection area, can the footprint stay outside it, and if not, what foundation solves the problem. This is general guidance rather than legal advice, so confirm the position with your council's tree officer before you rely on it.
Finding out whether the tree is protected
There are two separate forms of protection and a tree can carry both.
A Tree Preservation Order is made by the council under the Town and Country Planning Act 1990 and names specific trees, groups, areas or woodlands. Most councils publish an Order map online. Orders also appear in local land charges, so your conveyancing search should have flagged one when you bought.
Conservation area protection is automatic. Any tree in a conservation area with a stem diameter over 75mm, measured at 1.5 metres above ground, is protected without an Order, and the council has six weeks from notice to decide whether to make one.
Check the neighbours' trees as well as your own. Protection follows the tree, and the roots do not stop at the fence.
What the root protection area does to your footprint
The working figure comes from BS 5837:2012. Take the stem diameter at 1.5 metres above ground, multiply by 12, and that is the radius of a circle centred on the stem. A 400mm stem gives a 4.8 metre radius. A mature oak at 600mm gives 7.2 metres, which on an ordinary suburban plot reaches most of the way to the house.
That circle is where roots are assumed to be and where the soil has to stay undisturbed. It can be reshaped where an existing building, a road or the site levels make rooting unlikely in one direction, as long as the area stays the same and touches the stem. Reshaping it purely because the extension is in the way does not survive scrutiny.
Two practical consequences. Trenches, service runs, spoil heaps, cement mixers and scaffold bases all count as disturbance. And a rear extension that fits comfortably within rear extension depth limits can still be undeliverable because of a tree that permitted development rules say nothing about.
Foundations that keep the tree and the extension
Where the footprint has to enter the root protection area, the method statement carries the case. Ranked by how readily councils accept them:
- No-dig construction for terraces, paths and driveways, using a cellular confinement system laid over a geotextile on the existing ground level.
- Screw piles, which avoid spoil, need no concrete pour and can be positioned around roots found in trial pits.
- A pile and beam foundation with a suspended floor and a ventilated void, so that excavation is limited to small dispersed points.
- Hand digging under arboricultural supervision, with roots above a set diameter retained and any cuts made cleanly.
Traditional trench fill within a root protection area is the one option that will not be agreed. It is also the one most builders price for, so tell your builder about the tree before you take quotes.
Clay soils add a second problem that has nothing to do with protection. Where a tree is close to a new foundation on shrinkable clay, the depth is driven by the risk of heave and subsidence, and the structural engineer will work from the species, the mature height and the distance. That calculation can push a foundation deeper at the same time as the tree officer wants it shallower, which is exactly the situation piles were invented for.
When the council will ask for a tree report
Most validation lists require a tree survey and an arboricultural impact assessment where works fall within a set distance of a tree of a certain size, often expressed as within the root protection area or within a stated number of metres. Conservation areas lower the threshold.
The document set follows the standard: a survey schedule with each tree numbered, a tree constraints plan showing the protection areas, an Arboricultural Impact Assessment covering the effects of the proposal, then a tree protection plan and method statement for the works.
For a modest householder scheme this is not a long document, but councils expect a suitably qualified arboriculturist to prepare and sign it, and professional review is strongly advised before submission. If the tree makes the extension unworkable, a garden building instead sometimes solves the accommodation problem without touching the root protection area at all.
The six week notice for conservation area trees
For a tree in a conservation area with no Order on it, you give the council six weeks written notice of the proposed works, describing the tree and what you intend to do. The council can respond by making an Order, by agreeing, or by saying nothing, in which case you may proceed after the six weeks and within two years.
For a tree under an Order, you apply for consent on the council's form, with a plan and a justification. The council has eight weeks. Refusals and conditions can be appealed to the Planning Inspectorate.
| Situation | What you send | Timescale |
|---|---|---|
| Tree under a Preservation Order | Application for consent for tree works | Eight weeks |
| Tree in a conservation area, no Order | Written notice of proposed works | Six weeks |
| Dead tree | Five days notice before works | Five days |
| Immediate risk of serious harm | Notice as soon as practicable | After the event where urgent |
Keep photographic evidence for the dead or dangerous exemptions. The burden of proving the exemption sits with the person who cut the tree, and a stump proves nothing.
Conditions, fencing and what happens on site
Assume a pre-commencement condition. The standard set requires the protective fencing to be erected to the approved plan before any equipment, materials or machinery come onto the site, retained throughout, and not moved without written approval. Many councils add a requirement for arboricultural supervision at specified stages, with a written record submitted afterwards.
The fence is a working constraint, not a formality. Position it so that there is still somewhere to stack blocks and stand a mixer, because a fence with no room to work behind it gets moved on day three and the breach is visible from the pavement.
And take photographs of the fencing on the day it goes up, dated. If a neighbour reports the site, that photograph is the difference between a query and an enforcement investigation.
Work out which documents your council will expect alongside the tree report before you submit. You can enter your postcode on PlanScope to see which reports your site is likely to need.
PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.
Frequently asked questions
How do I find out if a tree is protected?
Ask the council's tree officer or search the council's Tree Preservation Order map, which most authorities publish online alongside conservation area boundaries. Orders are also recorded in local land charges, so a conveyancing search will show them. If the tree stands in a conservation area it is protected whether or not an Order exists.
Can I build within the root protection area of a protected tree?
Sometimes, with an arboricultural method statement that shows how the roots will be protected. The usual answers are no-dig construction for hard surfaces and piled or screw pile foundations for structures. The smaller the incursion and the better the remaining soil volume, the easier it is to justify.
Does planning permission let me remove a protected tree?
Not on its own. The Tree Preservation Order regulations exempt works that are necessary to implement a full planning permission, so if the approved drawings clearly require the tree to go, a separate consent is not needed. Outline permissions do not carry that exemption. Show the tree and its intended fate on the submitted plans to avoid the argument.
What is the penalty for damaging a protected tree?
Cutting down, uprooting or wilfully destroying a protected tree is a criminal offence and can attract an unlimited fine on conviction. Lesser damage, such as careless root severance, is also an offence with a lower maximum penalty. Councils also use replanting notices, which require a replacement tree of the same species in the same place.
Do I need consent for a neighbour's tree that overhangs my extension?
You have a common law right to cut back branches to the boundary, but that right is suspended where the tree is protected. Serve the conservation area notice or apply for consent under the Order first. Tell your neighbour before you do anything, and keep the cut material available to offer back to them.
Sources and further reading
This article is general guidance about the planning system in England and, where stated, the rest of the UK. It is not legal or professional advice. Check your local planning authority’s validation requirements and take professional advice for your specific site.