Describing tree works correctly on an application

A tree works application that says "reduce and tidy" will come back to you. Councils need a description precise enough to be granted, conditioned and later checked on site, which in practice means each tree numbered, each operation named in the terminology of the British Standard, and every reduction or clearance given as a measurement in metres. Vague wording is the most common reason a tree application is invalidated or refused, and the fix costs nothing but half an hour with the tree and a tape.

Why vague descriptions get refused

Two routes bring tree works to a council. Works to a tree covered by a Tree Preservation Order need a formal application decided under the Town and Country Planning (Tree Preservation) (England) Regulations 2012. Works to a tree in a conservation area that is not already protected need six weeks' written notice under section 211 of the Town and Country Planning Act 1990, after which the council either makes an Order or lets the works proceed.

Both routes fail on the same thing. A tree officer cannot grant consent for an operation whose extent is unknown, because the consent would be unenforceable. "Crown reduce by a third" is meaningless: a third of what, measured how, and from which surface. "Cut back from the house" gives no clearance distance. "Tidy up the dead wood" gives no diameter threshold.

Worse, an imprecise consent is a trap for the applicant. If the contractor does more than the officer understood the consent to cover, the works can amount to unauthorised damage to a protected tree, and the penalties for that are set out in our note on damaging a protected tree. Precision protects you as much as it protects the tree.

Crown reduction expressed as a measurement

The British Standard on tree work, BS 3998, sets the vocabulary councils use. A crown reduction is a reduction in the overall size of the crown, and it is specified as the reduction in height and in lateral spread, in metres, with a note on the final crown shape.

A workable description reads something like this: reduce overall height by 2 m and lateral spread by 1.5 m on all aspects, retaining a natural outline, with final cuts made to suitable growth points and no cut exceeding 50 mm diameter. Every element there is checkable. An officer can stand under the tree afterwards with a clinometer and a photograph and say whether it was done.

Avoid percentages for reduction work. A percentage reduction in height is ambiguous, and a percentage of crown volume is not something two people will measure the same way. Where the objective is asymmetric, say so and give different figures for different aspects rather than a single number applied to a tree that only needs work on one side.

Crown lifting and the clearance height

Crown lifting means removing the lowest branches to give clearance underneath. Specify the clearance height above ground level, and say what the clearance is for.

Highway authorities commonly require around 5.2 m of clearance over a carriageway and 2.5 m over a footway, but the figures are set locally and should be confirmed with the highway authority rather than assumed. Over a garden or an amenity area, clearance is a matter of use: 2.5 m suits a lawn, more suits a parking area.

Two cautions. Lifting a mature tree by removing large primary limbs is not a crown lift, it is a major reduction of the lower crown with a different effect on the tree and on its appearance, and officers treat it as such. And on a tree with low sweeping branches that form its character, a heavy lift changes what the Order was made to protect, which is a planning objection rather than an arboricultural one.

Thinning, deadwooding and selective removal

Crown thinning is the removal of a proportion of secondary branchwood throughout the crown, leaving the outline unchanged. It is specified as a percentage of leaf area, and the standard advises against going far: 10 to 20 per cent is normal practice and anything approaching 30 per cent needs justification. Thinning does not reduce the size of a tree, and describing it as a way of "letting in light" to a garden usually prompts an officer to ask what is really being proposed.

Deadwood removal should give a diameter threshold and a purpose, for example removal of deadwood over 25 mm diameter over the footway and the parking area, retaining deadwood elsewhere for its habitat value. Blanket deadwooding of a veteran tree is a loss, not a gain.

Selective branch removal is the honest description where one or two named limbs are coming off. Identify them by compass bearing and by height on the stem, mark them on a photograph, and say why.

Pollarding and why councils resist it

Pollarding is a management system, not a single operation. A tree that has been pollarded before can be re-pollarded to the existing knuckles, and that is usually acceptable. Initiating a pollard on a mature tree that has never been cut is a different proposition: it removes most of the crown, creates large wounds on old wood, produces weakly attached regrowth and commits the owner to a cutting cycle in perpetuity.

Expect refusal unless there is a clear reason, such as a structural defect identified in a report. If the real motive is size, a properly specified reduction over two or three cycles is far more likely to be granted.

Naming the standard and referencing the plan

Every application improves when it says which document it is written to. A line stating that the works are specified in accordance with BS 3998 tells the officer that the terminology means what they think it means.

Number the trees and use those numbers consistently across the form, the plan and the photographs. Where a tree survey already exists for the site, reuse its numbering rather than inventing a new sequence, because the officer may have the survey open alongside your application. On a development site, keep the tree works description in the application consistent with the protection measures shown on the tree protection plan, since a contradiction between the two is an easy reason to hold the decision.

Photographs, reasons and evidence

The form asks for a reason. Give a real one. Subsidence claims need the insurer's or engineer's report, ideally with the soil and root evidence, not just an assertion. Structural defects need the arboriculturist's observations. Light and leaf fall are weak reasons on their own and honest applicants say so rather than dressing them up.

Photographs carry more weight than any amount of prose. Take one from a distance showing the whole tree against the sky, annotate it with the proposed cuts, and include a second from the position of whatever is being affected. Our piece on specifying crown works councils will accept goes further into the wording officers respond to.

This is general guidance, not legal advice; check the position with your local planning authority or a qualified arboriculturist 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. Enter your postcode on PlanScope to see which reports a site with protected trees is likely to need.