Council tree officer comments and the pre-application check

The council tree officer usually sees your application twice: once as an internal consultee during determination, and once informally if you ask at pre-application stage. The second visit is worth arranging. A council tree officer planning objection lands in week five or six of an eight week determination, at the point where redesign means withdrawal, and most of those objections are about layout decisions taken months earlier.

Trees are also the constraint most often discovered late, because they are outside the red line, in the neighbour's garden, or simply not drawn.

What the tree officer reviews, and when

At validation, the officer checks whether the submitted tree information meets the local list. During consultation, they assess the effect of the proposal on trees worth keeping, the deliverability of the construction method, and whether the replacement planting is credible.

They are looking at four things. Which trees are affected, directly or through their root protection areas. Whether the retained trees can survive the construction process. Whether the finished development will put pressure on those trees through shading, leaf fall or subsidence claims. And whether any loss is compensated.

The fourth is where schemes are won and lost. An officer who accepts the loss of a category C sycamore will still object where nothing replaces it, and replacement planting shown on a landscape drawing with species, size at planting and a maintenance period is far more persuasive than a note saying trees will be planted.

Tree Preservation Orders and conservation area status change the procedure but not the assessment. Where a protected tree is to be felled, consent is needed in its own right, and where a tree in a conservation area is affected, six weeks notice under section 211 of the Town and Country Planning Act 1990 applies.

Validation triggers for a tree survey

Most local validation lists require tree information where trees are on or adjacent to the site and could be affected. Adjacent does a lot of work in that sentence, because a mature oak in the garden next door can have a root protection area extending well inside your site.

The recognised method is the British Standard for trees in relation to design, demolition and construction, BS 5837:2012. It sets out a survey that records each tree's species, height, stem diameter, crown spread, condition, estimated remaining contribution and a category:

• Category A, high quality trees with an estimated remaining contribution of at least 40 years.
• Category B, moderate quality with at least 20 years.
• Category C, low quality with at least 10 years, or young trees.
• Category U, trees in such condition that they cannot realistically be retained.

The root protection area is calculated from stem diameter and drawn as a circle or a modified shape where roots are known to be constrained. That area, not the canopy, is what constrains your foundations. A tree survey done before the layout is fixed costs a fraction of one done afterwards.

Root protection areas and layout

The first design move is to overlay the root protection areas on the proposed layout and see what collides. Where a building footprint sits inside one, three options exist: move the building, use a foundation design that avoids excavation within the area, or fell the tree and justify it.

No-dig construction is the usual technical answer for driveways and parking within a root protection area. A cellular confinement system laid on a geotextile over the existing ground, with no excavation and a permeable surface, keeps the soil profile intact. It costs more per square metre than a dug construction and much less than losing the tree.

Level changes are the hidden killer. Raising ground level over roots by 300 mm can be as damaging as cutting them, because it starves the soil of oxygen. Show existing and proposed levels within every root protection area on the drawings.

Service runs need the same treatment. Trenching for drainage through a root protection area defeats a scheme that is otherwise carefully designed, so plot the drainage strategy and the arboricultural constraints on one drawing early.

Off-site trees and neighbouring canopies

Trees you do not own are a planning constraint even though you have no control over them. The officer will assess the effect of your development on them, and the effect of them on your development.

Overhanging branches can be pruned back to the boundary under common law, subject to any Tree Preservation Order or conservation area notice, and the arisings belong to the tree owner. That right does not extend to work that would kill the tree, and it is a poor basis for a design.

Shading is the more common issue in the other direction. A new dwelling sited two metres from a mature canopy will produce a request to fell it within five years, and officers refuse layouts that build that conflict in. Model the shading, and where a room relies on light from the shaded side, redesign rather than argue.

Where the canopy provides screening relied on in a landscape assessment, secure it. A Landscape Strategy that depends on a neighbour's beech tree is a strategy with a single point of failure.

Fencing, method statements and conditions

The usual condition package has three parts: a tree protection plan showing fencing positions, an arboricultural method statement covering every operation within a root protection area, and a requirement for supervision by an arboriculturist at defined stages.

Protective fencing to the British Standard is a rigid barrier fixed to a scaffold frame, not plastic mesh on stakes. It goes up before any material arrives on site and stays up until the last delivery has left. Photograph it in position and send the photographs to the officer, because that single email prevents most enforcement visits.

Ground protection is the other half. Where a vehicle must cross a root protection area, a temporary load-bearing surface over a geotextile spreads the load. Where materials must be stored, they go outside the fencing. On a constrained site the practical answer is often a Construction Management Plan that fixes the compound location away from every protected root zone before the contractor arrives with their own ideas.

The method statement should name the supervision points: fencing installation, any excavation within a protection area, any service run, and the removal of fencing. An arboricultural impact assessment and its accompanying method statement are normally prepared by a suitably qualified arboriculturist, and professional review is strongly advised.

Answering an objection with a revised layout

If an objection arrives, the response that works is a drawing, not a letter.

Take the officer's specific concerns, one by one. Shift the footprint to clear the root protection area. Change the driveway construction to no-dig and show the detail. Add replacement planting at a stated size with a five year maintenance schedule. Then send an amended plan with a short covering note listing what changed and why.

Ask for a site meeting before you draw. Ten minutes on site with the tree officer usually reveals which tree they actually care about, and it is not always the biggest one.

To check which documents your site is likely to need, enter your postcode on PlanScope and answer the constraint questions.

This is general guidance, not legal advice. Check the position with your local planning authority or a qualified professional before relying on it.

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