Protected trees and permitted development on the same site

Permitted development rights let you build. They do not let you cut, prune or damage a protected tree. A TPO and permitted development can sit on the same plot quite happily until your extension's foundations reach the root plate, and at that point the tree rules take over. The Town and Country Planning (Tree Preservation) (England) Regulations 2012 require the council's written consent before a protected tree is cut down, topped, lopped, uprooted or wilfully damaged, and nothing in the General Permitted Development Order switches that off.

The same applies in a conservation area without any Order at all. Section 211 of the Town and Country Planning Act 1990 requires six weeks' notice to the local planning authority before works to most trees in a conservation area, which gives the council time to make a Tree Preservation Order if it wants to.

Why the Order does not override tree protection

The two regimes protect different things and are enforced separately. The General Permitted Development Order grants planning permission for certain building works. Tree protection is a separate consent about the tree itself, administered by the council's tree officer, and breaching it is a criminal offence rather than a planning breach.

There is one wrinkle worth being honest about. The 2012 Regulations contain an exemption for works to a protected tree that are necessary to implement a full planning permission, and permitted development is a form of planning permission granted by the Order. Whether that exemption reaches permitted development is not a settled question, and I would not rely on it. Councils generally expect an application, tree officers take a dim view of homeowners who assume otherwise, and the downside of being wrong is a prosecution rather than a refused application.

So the practical rule is simple. If a protected tree needs any work for your extension to happen, apply for consent first.

Tree Preservation Order consent and the application

Applying is free and the application is made to the council on the standard tree works form, usually through the Planning Portal or the council's own system.

What the tree officer wants to see:

• A plan showing the tree, its canopy spread and the proposed works.
• A description of the works tree by tree, using proper terms such as crown reduction, crown lift or removal, with measurements.
• The reason, which has to be about the tree or about an unavoidable conflict rather than about preference.
• Where removal is sought, what replacement planting is offered and where.
• An arboricultural report where the case is technical, for example a structural defect or a root conflict.

The council has eight weeks to decide. Consent can be refused, granted, or granted with conditions, and a refusal or condition can be appealed to the Planning Inspectorate. Where the council grants consent to fell, it will usually impose a replacement planting condition, and section 206 of the 1990 Act imposes a duty to replace a protected tree that is removed in contravention of an Order in any event.

The six week notice for conservation area trees

In a conservation area the mechanism is a notice rather than an application. You tell the council what you intend to do, and then wait.

If the council does nothing within the six weeks, you may carry out the works described in the notice, and the permission lasts two years. If the council makes a Tree Preservation Order during the six weeks, you are back to the consent route. That is exactly what tree officers use the period for, so a notice is not a formality.

Measure the diameter rather than guessing. The exemption threshold is based on stem diameter at 1.5 metres above ground, and a tree that looks small on a drawing often is not.

Works to roots during foundation excavation

This is where householders get caught, because nobody thinks of digging as tree work. Severing roots is capable of amounting to wilful damage to a protected tree, and if the damage is likely to destroy the tree the offence is the more serious one.

Root protection areas are calculated from stem diameter under BS 5837:2012, and the resulting area is usually much larger than people expect. A mature oak can have a root protection area extending well beyond its canopy. If your trench falls inside it, the options are a redesigned foundation, a different foundation technique, or consent for the root pruning with method supervision.

Three practical measures:

1. Get a tree survey and root protection area plan before the foundation design is finalised, not after the builder has priced it.
2. Where the trench cannot be moved, consider a pile and beam or a cantilevered slab solution, which the structural engineer prices against the cost of losing the design.
3. Where roots must be cut, get written consent, use hand digging within the protection area, and have the works supervised with a record kept.

A tree survey to BS 5837 is the document that holds all of this together, and councils normally expect a suitably qualified author for it, with professional review strongly advised. Hard surfacing raises the same issue, and permeable paving under Class F still has to respect a root protection area even though no application is needed for the paving itself.

Exemptions for dead and dangerous trees

The exemptions are narrower than the folklore suggests.

A dead tree may be removed, but you must give the council five days' notice beforehand unless the work is urgently necessary. Dead means dead, not declining. And a tree in poor condition is not exempt, so councils do check, sometimes by inspecting the stump.

Work that is urgently necessary to remove an immediate risk of serious harm is permitted without prior consent, with notice as soon as practicable afterwards. The bar is immediacy. A structural defect identified in a report two months ago is not an immediate risk, and the right response is an application supported by that report.

Photograph everything before, during and after. Where a prosecution follows, the burden of establishing the exemption falls on the person who carried out the works, and contemporaneous photographs with a measuring staff are the evidence that settles it.

An illustrative example

Illustrative only: a 1930s semi with a protected lime at the rear boundary, and a proposed 3 metre single storey rear extension within permitted development limits. The root protection area calculated from the stem diameter reaches 1.5 metres into the extension footprint. The homeowner commissions an arboricultural report, applies for consent to prune two lower limbs, and adopts a piled foundation under supervision within the protection area. The extension itself needs no planning application. The tree works do, and the sequencing is tree consent first, then build.

Penalties for unauthorised works

Cutting down, uprooting, destroying or wilfully damaging a protected tree in contravention of an Order is an offence under section 210 of the 1990 Act. On conviction in the Crown Court the fine is unlimited. Lesser breaches, such as pruning without consent, carry a fine on the standard scale.

Councils do prosecute, and they also use the replacement duty, which can require a tree of a specified size to be planted in the same place. The commercial reality for a homeowner is worse than the fine: a prosecution has to be disclosed on sale, and an unauthorised extension that relied on illegal tree works is awkward to sell.

Sequencing tree consent before building

Build the programme backwards from the tree, not forwards from the builder's availability.

Get the tree survey and root protection plan. Fix the foundation design around it. Apply for tree works consent and allow eight weeks, or serve the section 211 notice and allow six. Only then book the groundworks. A short Planning Statement is worth preparing where a related application is also needed, because it lets you present the tree position and the design response together.

Nothing here is confirmed by a planning officer's email. A Lawful Development Certificate is the only formal way to confirm that works are lawful, and it says nothing about the tree consent, which is a separate matter entirely. Enter your postcode on PlanScope to see which reports a site with a protected tree is likely to need.

This is general guidance, not legal advice; check the position with your local planning authority or a qualified professional before relying on it. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.