This is a common source of friction between neighbours, and there are a couple of different situations worth separating out.
Overhanging growth
As a general rule, you can trim branches or growth that overhang from a neighbour's hedge back to the boundary line, with cuttings normally remaining the hedge owner's property. This is general guidance rather than legal advice.
Genuinely high hedges
Where a hedge is causing a serious loss of light or enjoyment of a property, formal high-hedge procedures involving the local council can potentially apply, though the rules are more involved than a simple height limit.
Herring can carry out professional pruning of overhanging hedges where appropriate. Call 07780 727385.
Got a question about your hedge? Speak to the team at Herring.
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Herring Trees & Landscaping provides professional hedge maintenance for homeowners, landlords and commercial customers across Derby, Nottingham and the surrounding areas. Every job starts with a proper assessment and a free, no-obligation quotation.