Street trees, crossovers and highway works
A street tree belongs to the highway authority, not to planning. Here is why dropped kerb refusals happen and which design changes get consent instead.
Wanting a street tree crossover means dealing with the highway authority rather than the planning department, and that surprises most householders. A tree growing in the adopted highway, including the verge, is controlled by the highway authority under the Highways Act 1980, not by a Tree Preservation Order and not usually through a planning condition. So the dropped kerb application and the tree question are decided by the same body, and it is a body with a statutory duty towards the highway and a general reluctance to lose trees it maintains.
The practical position: a dropped kerb that requires a street tree to be felled is refused far more often than it is granted, and the productive route is nearly always a design that keeps the tree.
Who owns and controls a street tree
Trees within the adopted highway belong to the highway authority, which is the county council in a two-tier area, or the unitary or London borough elsewhere. Transport for London controls trees on the roads it manages in London. The authority maintains the tree, inspects it and decides what happens to it.
A Tree Preservation Order is generally unnecessary on a highway tree, because the authority already controls it. Some authorities do make Orders covering highway trees for particular reasons, and a conservation area designation brings its own notification requirements for trees, so check the position rather than assuming the tree is unprotected in planning terms.
The boundary between your land and the highway is the thing to establish first, and the title plan is not always conclusive. Highway boundaries can extend beyond the visible kerb line, and the authority holds the definitive record. Ask for it in writing before designing anything.
Why authorities resist removal
Street trees deliver measurable benefits the authority is accountable for: shade and cooling, air quality, surface water interception, street character and property values across a whole street rather than one plot. Many authorities have adopted tree strategies with a presumption against removal and a net gain target for canopy cover.
There is also an asset argument. A mature street tree took decades to establish and cannot be replaced in kind, and replacement in the same position is often impossible because the services under the footway have changed since it was planted.
So the reasons that succeed are narrow. The tree is dead, dying or dangerous. It is causing damage that cannot be managed. Or there is a compelling highway safety reason such as an unresolvable visibility obstruction. Convenience is not among them, and neither is a preference for a particular driveway position.
Excavation within the rooting zone
This is the technical heart of most crossover refusals. Constructing a dropped kerb and a driveway across a verge involves excavation, and excavation within a tree's rooting area severs roots and compacts soil.
BS 5837:2012 sets out the approach to root protection areas for development, and the same principles inform highway authority requirements even though the crossover is not a planning matter. The root protection area is calculated from the stem diameter, and it defines the zone where excavation, compaction and level change need to be avoided or engineered around.
What causes the damage is not just the cut roots. Compaction from plant and from subsequent vehicle loading reduces pore space in the soil, which reduces the oxygen and water available to the remaining roots. A tree can look fine for five years and then decline, which is why authorities are cautious about consenting work whose effects appear long after the crossover was built.
| Activity | Effect on the tree | Usual requirement |
|---|---|---|
| Trench excavation across the rooting area | Severs structural and fine roots | Avoid, or hand dig with root pruning by an arboriculturist |
| Level reduction over roots | Removes soil and fine roots | Avoid |
| Plant tracking over the rooting area | Compaction | Ground protection boards |
| Permanent vehicle loading | Long-term compaction | No-dig construction with cellular confinement |
| Service diversion through the rooting area | Severs roots | Trenchless techniques |
Alternatives that keep the tree
Most crossover applications that initially look impossible can be resolved. In rough order of how often they work:
- Move the crossover along the frontage to a position clear of the root protection area, even where that makes the driveway arrangement less convenient.
- Narrow the crossover to the minimum width the authority will accept for the vehicle, reducing the excavation footprint.
- Use a no-dig construction over the rooting area: a cellular confinement system laid on a geotextile above existing ground level, with a permeable surface, which spreads the load without excavation.
- Reduce the depth of construction by specifying a permeable surface with a shallower build-up.
- Where a small number of roots must be cut, have the cutting done cleanly by an arboriculturist under supervision, with a method statement agreed in advance.
- Share an existing access with a neighbour, where the layout permits.
Option three is the one most householders have not heard of and the one authorities often accept. It costs more than a conventional build-up and it raises the surface level slightly, which needs to be resolved at the threshold, but it keeps the tree and it gets consent.
The supporting documentation looks much like the arboricultural work on a development site, and a tree survey with a root protection area plan and a method statement is what the authority will want to see.
Charges and commuted sums
Crossover works are carried out either by the authority or by a contractor approved by it, and the applicant pays. Fees are published by each authority, revised periodically, and cover the inspection, the works and often an administration charge. Take the current figure from the authority's own published schedule.
Where a tree is removed with consent, some authorities charge a commuted sum representing the value of the lost asset and the cost of replacement and establishment. Valuation methods vary between authorities, and the sum for a mature tree can be substantial. It is worth asking early what the figure would be, because it changes the economics of the alternatives.
Where a tree is retained but work occurs nearby, the authority may require a bond or a deposit against damage, released after a monitoring period.
Damage during works and liability
If a street tree is damaged or removed without consent, the liability sits with whoever did the work and often with the property owner who commissioned it. Authorities pursue these claims, and the sums reflect asset value rather than the cost of a sapling.
Practical protection: get the consent in writing before any work starts, keep the approved method statement on site, photograph the tree and the verge before work begins, and make the arboricultural supervision a contractual requirement of the groundworker rather than a hope. Damage disputes are settled on evidence, and the before photographs are the evidence.
Utility works in the same verge are a separate and continuing risk to the tree, and the interaction between them is covered in street trees, highway works and utility trenching.
Where the planning and highway routes meet
A dropped kerb alone often needs no planning permission, because the crossover is highway works and the hardstanding may be permitted development, subject to the conditions on permeable surfacing and the position relative to the highway. Where the property is a flat, is listed, sits in a conservation area with an Article 4 direction, or fronts a classified road, the position changes and planning permission may be required.
Where the crossover forms part of a larger scheme needing planning permission, the tree becomes a material consideration in that application as well, and the authority can require its retention through a condition even though the tree itself is a highway asset. That is the situation where the arboricultural evidence matters most, and where the Landscape Strategy would normally record the retained tree.
Apply for the crossover and the planning permission in parallel where both are needed, and tell each team about the other. A planning permission for a scheme whose access the highway authority will not approve is worth very little.
This is general guidance, not legal advice. A Lawful Development Certificate is the only formal way to confirm that works are lawful. Check the position with your local planning authority, the highway 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.
Frequently asked questions
Who decides whether a street tree can be removed for a dropped kerb?
The highway authority, under the Highways Act 1980. That is the county council in a two-tier area, or the unitary authority or London borough elsewhere, with Transport for London controlling its own roads. A Tree Preservation Order is usually unnecessary because the authority already controls the tree, though a conservation area brings its own notification requirements.
Why do authorities refuse to fell street trees for driveways?
Because the tree delivers shade, air quality, surface water interception and street character across a whole street, and many authorities have adopted tree strategies with a presumption against removal and canopy cover targets. A mature tree cannot be replaced in kind, and services under the footway often make replanting in the same position impossible.
Why does excavation near a street tree matter so much?
Because it severs roots and compacts soil. BS 5837:2012 sets out root protection areas calculated from stem diameter, and the same principles inform highway authority requirements. Compaction from plant and from later vehicle loading reduces the oxygen and water available to remaining roots, and decline can appear years after the work.
What is a no-dig crossover construction?
A cellular confinement system laid on a geotextile above existing ground level with a permeable surface, spreading vehicle loads without excavation into the rooting area. It costs more than a conventional build-up and raises the surface slightly, which needs resolving at the threshold, but it keeps the tree and authorities often accept it.
Do I need planning permission as well as a crossover licence?
Often not, because the crossover is highway works and the hardstanding may be permitted development subject to the permeable surfacing conditions. The position changes for flats, listed buildings, areas with an Article 4 direction, and frontages onto a classified road. Apply for both in parallel where both are needed.
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.