Hedgerow translocation and reinstatement
Translocation moves hedge stock rather than habitat. What the method statement needs, how to reinstate around a new access, and why hedgerow units cannot be traded for other habitat.
Hedgerow translocation on a development site means lifting lengths of hedge with their rootballs and soil and replanting them elsewhere, usually because the layout needs the line removed and the ecologist will not accept a replanted whip hedge as equivalent. It is a reasonable proposal in a narrow set of circumstances. It is also the mitigation most likely to be written into a condition and then quietly fail in year three, which is why authorities now ask for monitoring and replacement obligations rather than a one-line commitment.
Two separate regimes meet here. Removal itself may need a notice under the Hedgerows Regulations 1997, unless planning permission has already been granted for the development requiring it. And the loss has to be accounted for in the statutory biodiversity metric, where hedgerows sit in their own module with their own trading rules.
When translocation is proposed
Translocation tends to come up in three situations.
A hedge of high distinctiveness sits across the only viable access point, and replacing it with new planting would leave a shortfall in hedgerow units that cannot be made up on site. A hedge has archaeological or historic value as a boundary, often a parish or township line, so its material rather than its species composition matters. Or an estate layout needs the hedge line moved a few metres to accommodate a road, and keeping the existing stock costs less than negotiating off-site compensation.
The honest assessment is that the first and third of those are more often about metric arithmetic than ecology. That is not a criticism. The metric is the mechanism, and moving existing stock scores better than planting new.
Why the success rate is uncertain
There is no reliable general figure for hedgerow translocation survival, and anyone quoting one should be asked for the dataset. What is consistent is the list of reasons it goes wrong.
Mature hawthorn and blackthorn have extensive root systems, and a machine-lifted rootball captures a fraction of them. Species respond differently: field maple and hazel tend to re-establish, while older thorn stock suffers. Soil mismatch between the donor and receptor site changes drainage and pH. And the first two summers are decisive, so a translocation carried out in February before a dry spring is working against itself.
Associated species rarely move with the hedge. The bank, the ditch, the ground flora and the invertebrate assemblage that make an old hedge worth keeping do not transfer in a rootball, which is why an ecologist may argue that translocation preserves the stems and loses the habitat.
Say all of this in the submission. An application that claims translocation will succeed invites a condition requiring it to succeed. An application that sets out the risk, proposes monitoring and offers a replacement mechanism is in a better position when the first failures appear.
Method statement content and timing
The method statement is an arboricultural and ecological document and should be prepared by someone competent in both. Expect it to cover the following.
- A survey of the hedge to be moved, recording length, species composition by 30 metre section, height, width, structural condition, associated trees and the position of any bank or ditch.
- The receptor location, with soil analysis, drainage, aspect and a plan showing the new alignment and its relationship to plot boundaries and services.
- The lifting method, machine type and rootball dimensions, with the depth and width to be achieved and the handling sequence from lift to replant.
- Timing, carried out in the dormant season and outside the bird nesting season, which runs broadly March to August and is protected under the Wildlife and Countryside Act 1981.
- Ground preparation at the receptor site, including decompaction, topsoil specification and any imported soil.
- Aftercare for at least five years, with irrigation in the establishment period, weed control, a cutting regime and annual condition recording.
- The replacement trigger: what percentage loss prompts gapping up, and in what season.
Where the hedge contains trees, the tree work falls under BS 5837:2012 and belongs in the tree survey and the associated method statement rather than being dealt with as hedgerow work.
Reinstatement where an access is formed
Cutting a new access through a hedge raises a conflict that cannot be designed away entirely. The visibility splay has to be kept clear, and a hedge grows.
The usual resolution is to set the reinstated hedge back behind the splay, on a line that keeps mature growth outside the sightline, and to secure the splay by condition so it stays free of planting above 900 millimetres. On a Devon or Cornish hedge bank the faced stone or turf structure has to be rebuilt rather than replanted, and the specification should name the facing material, the batter and the core.
Three details get missed. The cut ends of the retained hedge need laying or trimming back to a sound face, or they die back and the gap widens. Services entering the site through the new access will cross the hedge line, and a duct run in the rooting zone defeats the reinstatement. And the hedge on the highway side may belong to the highway authority rather than the applicant, which changes who can consent to the works.
Species matching and gapping up
Match the composition of the hedge being replaced, recorded section by section, rather than planting a standard mix. A hedge that is 70 per cent hawthorn with field maple and hazel should be reinstated in roughly that proportion, with local provenance stock where it can be sourced.
Typical specifications use a double staggered row of whips at around 300 to 400 millimetres centres, giving five or six plants per metre, with a mulch and guards against rabbit and deer browsing. That is a convention rather than a standard, so state the figure you are using and why. Detailed gapping-up practice is covered in our note on hedgerow gapping up, translocation and replacement.
Avoid species that will not take the cutting regime, and avoid planting a single species in long runs where the metric requires a varied multi-species structure.
How the statutory metric treats hedgerows
Under the Environment Act 2021 regime, biodiversity net gain is calculated with the statutory metric, and hedgerows form a separate module measured in units derived from length rather than area. The trading rules require hedgerow units to be replaced with hedgerow units, so a shortfall cannot be made up with grassland or woodland elsewhere on site.
Three features of the calculation shape the design.
Distinctiveness depends on the number of woody species present and on associated trees, so a native species-rich hedgerow with trees scores far above a species-poor managed hedge. Condition is assessed against defined criteria covering gaps, height, width and the presence of undesirable species. And habitat creation carries time-to-target and difficulty multipliers, which is exactly where translocated stock may be scored more favourably than new planting if the method statement justifies it.
Biodiversity net gain under the Environment Act 2021 requires the metric to be completed by a competent person and the biodiversity gain plan to be approved by the local planning authority. A Biodiversity Net Gain Assessment drafted with PlanScope is a starting point for that professional, not a substitute for them.
Conditions, monitoring and replacement
Expect three conditions rather than one: approval of the method statement before any works affecting the hedge, implementation in accordance with it, and a landscape and ecological management plan covering the 30-year period the biodiversity gain regime requires.
The monitoring regime should set out who records condition, against what criteria, in which years, and who receives the report. Where hedgerow units contribute to the net gain figure, the reporting years follow the gain plan rather than a five-year landscape condition, and the two timescales need reconciling at drafting stage or you end up with contradictory obligations.
Where arrangements are contested, the quality of the written method statement is what carries the argument, as our piece on arboricultural evidence at appeal sets out.
Enter your postcode on PlanScope to see which ecology and landscape documents your site 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.
Frequently asked questions
Do I need a hedgerow removal notice if I have planning permission?
Generally no. The Hedgerows Regulations 1997 exempt removal required to carry out development for which planning permission has been granted, so the notice procedure applies to removals outside that, for example agricultural clearance. Check the exemption carefully where permission is outline only or where the hedge sits beyond the application site boundary.
Is hedgerow translocation likely to succeed?
It is uncertain and species dependent. Field maple and hazel tend to re-establish while older hawthorn and blackthorn suffer, machine lifting captures only part of the root system, and the first two summers decide the outcome. Associated bank, ditch and ground flora do not move with the rootball, so stems are preserved rather than habitat.
How does the statutory biodiversity metric treat hedgerows?
As a separate module with units derived from length rather than area, scored on distinctiveness and condition. The trading rules require hedgerow units to be replaced with hedgerow units, so a hedgerow shortfall cannot be made good with grassland or woodland. The metric must be completed by a competent person under the Environment Act 2021 regime.
When can hedgerow works be carried out?
Translocation and removal should be in the dormant season and outside the bird nesting season, which runs broadly from March to August. Nesting birds are protected under the Wildlife and Countryside Act 1981 regardless of whether permission has been granted, so a late spring start usually needs a nesting check by an ecologist immediately before works.
How do you reinstate a hedge around a new access?
Set the new hedge line back behind the visibility splay so mature growth stays outside the sightline, secure the splay by condition against planting above about 900 millimetres, and lay or cut back the exposed ends of the retained hedge to a sound face. On a hedge bank, specify the facing material, the batter and the core rather than planting alone.
What planting specification should a reinstated hedge use?
Match the recorded species composition of the hedge being replaced, section by section, using local provenance stock. A common convention is a double staggered row of whips at 300 to 400 millimetre centres, giving five or six plants per metre, with mulch and browsing protection. State the figure you have adopted, because it is practice rather than a standard.
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.