Clearing a site before an application and the risk it creates

Clearing trees and scrub before you submit a planning application is one of the few moves in development that makes the planning position worse in every direction at once. It does not create a clean baseline. Since the Environment Act 2021, a site stripped on or after 30 January 2020 is assessed for biodiversity net gain as it was before the stripping, the council can make a Tree Preservation Order the same afternoon, and if anything on site was nesting or roosting you may have committed a criminal offence rather than a planning breach.

Buyers of scrubby back land hear the opposite advice regularly. Get the site tidy, remove the self seeded sycamores, and the officer sees a developable plot rather than a thicket. It is bad advice, and the reason is that planning judgement and biodiversity accounting both look backwards.

A Tree Preservation Order can arrive the same afternoon

Outside a conservation area, and absent an order, felling a tree on your own land is generally lawful. That is the starting point, and it is also the end of the good news.

A local planning authority can make a Tree Preservation Order at any time, and an order takes provisional effect from the date it is made, for up to six months while objections are considered. Tree officers monitor exactly the signals that precede clearance: a site sold, a pre-application enquiry, a tree survey commissioned, scaffolding, a chainsaw hire van. A phone call from a neighbour on the Monday and a provisional order served on the Tuesday is a normal sequence, and it binds you before anybody has considered whether the order is justified.

In a conservation area the position is tighter again. Section 211 of the Town and Country Planning Act 1990 requires six weeks' written notice to the authority before carrying out works to a tree above 75mm in diameter measured at 1.5 metres above ground level, and 100mm where the work is thinning to assist the growth of other trees. The six weeks exist so the authority can make an order. Serving the notice and felling in week two is an offence, not an administrative slip.

The offences you may already have committed

Contravening a Tree Preservation Order is an offence under section 210 of the 1990 Act, and when sentencing the court must have regard to any financial benefit that has accrued or is likely to accrue from the offence. That provision exists precisely for the developer who fells a protected tree because the uplift is worth more than the fine.

Section 206 adds a duty to replace a tree removed in contravention of an order, and section 207 lets the authority serve a tree replacement notice to enforce it. The duty attaches to the landowner and runs with the land, so a purchaser inherits it. The practice of how long those obligations bind is set out in the piece on tree replacement conditions and how long they bind.

Wildlife law is the sharper risk, because it applies whether or not a tree is protected:

• It is an offence under the Wildlife and Countryside Act 1981 to damage or destroy the nest of a wild bird while it is in use or being built. Most clearance between March and August touches something.
• Bat roosts are protected under the Conservation of Habitats and Species Regulations 2017 whether or not bats are present at the time, so felling a mature tree with cavities or lifted bark without an assessment is exposure of a different order.
• Badger setts, great crested newts in adjacent ponds, reptiles in rank grassland and hazel dormice in scrub all carry their own protection, and none of them is visible from a car.

None of that needs a planning application for it to bite. The authority does not have to prove harm to amenity. It has to prove the works happened.

The biodiversity baseline rolls back to 30 January 2020

This is the provision that changed the arithmetic. Under the biodiversity net gain regime introduced by Schedule 7A to the Environment Act 2021, the pre-development biodiversity value of a site is normally measured at the application date. But where activities carried out on or after 30 January 2020, without the planning permission they required, have reduced the biodiversity value of the land, the pre-development value is taken to be the value immediately before those activities were carried out.

Read that twice if you are buying land. Clearance carried out six years ago, by a previous owner, can still set your baseline. And the burden of evidence is yours: you have to show what the habitat was before you can measure against it, and if you cannot, the authority and its ecologist will reach a view that is unlikely to favour you.

In practice that means a cleared site produces a higher baseline habitat score than the bare ground you are looking at, a larger net gain requirement, and sometimes a scheme that cannot deliver 10 per cent on site at all. A Biodiversity Net Gain Assessment has to be completed using the statutory metric by a competent person under the Environment Act 2021 regime, with the biodiversity gain plan approved by the authority, so an AI-assisted draft is the framing for that specialist's work rather than a replacement for it.

The same logic applies outside the net gain regime. Ecological assessment guidance treats a recently degraded site as requiring a baseline reconstructed from available evidence, and a case officer will apply development plan policies on trees and habitat to the site as it should have been.

How a council proves what was there

Applicants underestimate this badly. The evidence available to a tree officer is better than the evidence available to you, and most of it is free.

• Historic aerial imagery, including the authority's own GIS layers and commercially licensed imagery that councils hold under corporate agreements.
• Street level imagery with capture dates, which pins a canopy to a month.
• Earlier planning applications on the same site or next door, which often contain a tree survey with a plotted schedule and a constraints plan.
• The authority's tree records, Tree Preservation Order schedules and conservation area appraisals.
• Stumps. A ring count gives age, the cut face gives a season, and the diameter gives the crown spread that a competent arboriculturist can reconstruct.
• Neighbours, who photograph things and keep them.

Where an allegation has been made, the way you respond in the first fortnight shapes everything that follows, and the approach is covered in responding to an unauthorised tree felling allegation.

If the ground is already bare

Sometimes you inherit the problem. A site is bought with the clearance already done, or a contractor went further than instructed.

What actually helps:

1. Reconstruct the baseline honestly and early. Commission an arboriculturist to produce a retrospective survey from imagery, stumps and any earlier survey, and an ecologist to do the same for habitats. Submit it rather than waiting to be asked.
2. Gather the dated evidence yourself: imagery, sale particulars, the vendor's own photographs, previous applications. If the clearance predates 30 January 2020, that date is worth proving properly.
3. Say what happened in the planning statement. An officer who discovers the clearance from a neighbour's objection treats the whole application differently from one who read about it on page three.
4. Offer more than the policy minimum in replacement planting, with a specification, a plan and a five year maintenance commitment. A Tree Survey and arboricultural impact assessment should show the new planting at mature crown spread, not as dots.
5. Expect the determination to take longer and expect conditions with teeth, including a landscape management plan and a replacement clause tied to a monitoring regime.

What does not help is arguing that the trees were low quality. Category C trees in a survey still count towards canopy cover policies, still provide habitat, and their removal still changes the baseline. The quality argument addresses amenity value and nothing else.

The sequence that avoids all of this costs a few hundred pounds and about three weeks. Survey the trees, check for an order, check the conservation area position, get a preliminary ecological walkover, then decide what the scheme can support. Clearance, if it is justified, belongs after the permission and inside the approved method statement.

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. To see which tree and ecology documents a site is likely to need, enter your postcode on PlanScope.