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Hedge overhanging a public road or footpath: the section 154 Highways Act 1980 duty in Gravesend

Many Gravesend and Northfleet properties front directly onto the footway with little or no verge between garden hedge and pavement. A privet or leylandii that missed one season's cut can push 300 to 400mm over the flagstones before autumn is out. Most homeowners assume this is purely a matter of courtesy to pedestrians. It is not: it is a statutory duty, and if you ignore a formal notice you can find yourself paying for a contractor you did not choose at a price you did not agree.

What the law says

The relevant provision is section 154 of the Highways Act 1980. It applies where a hedge, tree or shrub overhangs a highway, or any road or footpath to which the public has access, and does so in a way that meets at least one of four conditions:

• It endangers or obstructs the passage of vehicles or pedestrians.
• It obstructs or interferes with the view of drivers of vehicles.
• It obstructs or interferes with the light from a public lamp.
• It endangers or obstructs the passage of horse-riders.

Where any one of those conditions is met, a "competent authority" may serve written notice on either the owner of the plant or the occupier of the land on which it is growing. The notice requires the recipient to lop or cut the growth within 14 days from the date of service so as to remove the cause of the danger, obstruction or interference. In Gravesend and the rest of Gravesham, the competent authority for most public roads and footways is Kent County Council (KCC) acting as the highway authority.

If you do not comply within the 14-day window, the authority may carry out the work itself and recover the expenses reasonably incurred from you. That means a bill for the contractor's work. Confirm the current charges with KCC directly, because any figure printed elsewhere may be out of date.

Separately, section 137 of the Highways Act 1980 makes it a criminal offence to wilfully obstruct the free passage along a highway, including a footway, without lawful authority or excuse. It is more typically used against deliberate obstructions, but a persistent overhang that blocks a public footpath carries a cost-recovery risk under section 154 and, in the worst cases, potential exposure under section 137.

Practical clearance targets

Section 154 does not set fixed height thresholds: "endangers or obstructs" is the operative test, assessed on the facts of each case. In practice, Kent County Council's own guidance on overhanging vegetation sets these minimums:

• Over a carriageway (road surface): at least 5.2 metres of clear vertical headroom, extending about 50cm past the edge of the carriageway.
• Over a footway or public footpath: at least 2.4 metres of clear vertical headroom (the same minimum applies over cycle routes). Confirm the current KCC specification if you are responding to a specific notice.

These are vertical measurements, but the Act's "obstruction" test also catches angled or lateral growth: a branch projecting at waist height across the footway will fail the test even if the upright growth is well above 2.4 metres. After wet weather, heavy lateral branches droop further than they do on a dry day, so cut to a margin rather than to the minimum.

How to stay compliant: the steps to follow

1. Confirm whether your hedge borders public highway. Section 154 applies to public roads, footways (pavements), cycle tracks and bridleways. It does not apply to a shared private driveway between neighbours. If you are unsure whether a particular path is public highway, Gravesham Borough Council maintains the definitive map of public rights of way for the borough, and KCC holds the street gazetteer. When in doubt, treat it as public highway: the cost of a precautionary cut is trivial compared to the cost-recovery bill if a notice is served and ignored.
2. Check for a Tree Preservation Order and conservation area status before starting work. If a tree within or alongside the hedge carries a Tree Preservation Order made under the Town and Country Planning (Tree Preservation) (England) Regulations 2012, you normally need written consent from Gravesham Borough Council before cutting or removing it. If the tree sits in one of Gravesham's 23 conservation areas and the trunk diameter exceeds 75mm measured 1.5 metres above ground, a section 211 notice under the Town and Country Planning Act 1990 normally applies to significant work, and the six-week notice period is longer than the 14-day compliance window in a s.154 notice. Work needed to comply with an obligation imposed by an Act of Parliament is generally exempt from TPO consent and the section 211 notice, but the exemption covers only what the notice requires, so do not rely on it without checking. If either constraint might apply, contact Gravesham Borough Council's planning team and KCC Highways on the same day you identify the conflict, before the 14-day window expires, and get guidance in writing.
3. Check for active nests before putting a blade to anything.

   Is there an active nest in that overhanging growth?

   Section 1 of the Wildlife and Countryside Act 1981 makes it a criminal offence to intentionally damage or destroy an active bird's nest. Receiving a section 154 Highways Act notice does not suspend that obligation: the wildlife law runs alongside the highways duty. The main nesting season runs from 1 March to 31 August, with some species carrying later broods into September. Before cutting any section of hedge or tree growth that overhangs the highway, carry out a careful visual check for active nests. If you find one, stop work and notify KCC Highways in writing on the same day that a WCA 1981 constraint is preventing immediate compliance, giving the location and a description of the nest. The penalty is a fine (unlimited in England and Wales) or up to six months in prison, or both.

4. Cut to the practical clearance standard. Target at least 5.2 metres vertical clearance over any carriageway and at least 2.4 metres over any footway or footpath. Cut angled and lateral growth that crosses the footway below head height, not only the upright growth above the clearance line. Where the overhang is heavy, start from the highest point and work down so that cut material falls clear of the footway rather than piling on it. Sweep or rake the footway clean before you leave: a footway blocked with clippings fails the obstruction test just as surely as the uncut hedge.
5. If you receive a formal notice: act on it on the day it arrives. Note the date of service stated on the notice (this may differ from the date printed on the letter), since the 14-day window runs from service, not postmark. Read exactly what the notice specifies: it will describe the section of road or footway affected and identify the obstruction. If any TPO, conservation area or nesting-season constraint prevents immediate compliance, telephone and email both Gravesham Borough Council planning and KCC Highways that day to create a contemporaneous written record. Do not wait to see if the authority follows up: 14 days is a short window in any season.
6. Document the work. Photograph the hedge from the footway before you start, note the date and time, and photograph it again once the cut is complete. If KCC disputes compliance or later claims it had to carry out the work itself, dated photographs of a clear footway are the most straightforward evidence you have.

When a Tree Preservation Order or conservation area complicates the picture

For most front-garden hedges in Gravesend this will not arise. Ordinary privet, box, conifer hedges and mixed residential hedging along footways are not typically subject to TPOs. The situation changes when a hedge contains a significant tree that has been individually protected: a mature field maple, hornbeam or lime along one of the conservation area streets around Harmer Street, Darnley Road, King Street or Windmill Hill may carry a TPO even if it also functions as part of a boundary hedge. I check the Gravesham Borough Council TPO register as a matter of routine before quoting any hedge job in the borough, not only when a notice has already arrived, because discovering a TPO after cutting starts is worse than discovering it beforehand.

Where a section 211 notice would normally be required (conservation area, tree over 75mm diameter at 1.5m), the six-week notice period is longer than the 14-day compliance window in a section 154 notice. Tell Gravesham Borough Council and KCC Highways about the overlap as early as you can, keep a copy of the section 154 notice, and limit the work to what it requires while the position is confirmed in writing.

What this looks like in Gravesend and Northfleet

In the terraced streets of central Gravesend and Northfleet, gardens often meet the footway with no verge between them. Leylandii, privet, spotted laurel and cherry laurel planted at the garden edge can push well over the flags within a single growing season if the cut cycle is long. A single pass with a reach trimmer from the footway side and a careful sweep is often all that a typical domestic footway overhang needs.

On the Thames riverside walking route between Gravesend Pier and the Gravesend-to-Rosherville corridor, overhanging garden boundaries are a seasonal issue on the stretch where private gardens back onto the riverside path. The path is public right of way, and the same section 154 duty applies. Out in the Gravesham villages, Higham, Cobham, Meopham and Shorne, the same obligation runs along the public lanes and rural bridleways. In those situations it is worth checking whether the hedgerow itself is a qualifying hedgerow under the Hedgerow Regulations 1997: routine annual cutting for highway clearance does not normally engage the Regulations, but a more substantial back-cut might, and it is worth confirming the position with Gravesham Borough Council before starting.

Sources: Highways Act 1980, sections 137 and 154 (legislation.gov.uk); Wildlife and Countryside Act 1981, section 1; Town and Country Planning Act 1990, section 211; Town and Country Planning (Tree Preservation) (England) Regulations 2012; Hedgerow Regulations 1997; Kent County Council, "Overhanging vegetation"; Gravesham Borough Council, "Trees, hedges and planning."