If you own or manage a commercial property in London – whether that’s an office building, a block of flats, a retail site, or a housing association estate – the trees on your land are your legal responsibility. This isn’t a matter of best practice or goodwill: it’s a formal duty of care under UK legislation, and failing to meet it can result in prosecution, civil liability, and significant costs if a tree-related incident occurs.
This guide explains who the duty applies to, what it requires in practice, and what documentation is needed to demonstrate compliance.
The Legal Framework: Who Is Responsible?
The duty of care for trees on commercial and managed properties sits primarily under two pieces of legislation. The Occupiers’ Liability Act 1957 requires that anyone in control of premises takes reasonable care for the safety of all lawful visitors, and the Occupiers’ Liability Act 1984 extends a lesser but still real duty to trespassers. Where staff or contractors are present, the Health and Safety at Work Act 1974 adds a further obligation to ensure activities on site don’t expose employees or others to foreseeable risks.
Together, these Acts mean that landlords are responsible for the safety and condition of trees on their property, including any risk they may pose to tenants, visitors, or the public. Responsibility doesn’t end at the building entrance – it covers any tree within the site boundary whose failure could affect people or adjacent property.
How This Differs From a Homeowner's Obligation
A homeowner with a tree in their garden is subject to the same basic principle of duty of care, but the exposure is comparatively limited: fewer people use the land, and the consequences of a lapse are generally confined. For commercial landlords, property managers, and housing associations, the picture is very different. Tenants and their visitors, delivery contractors, maintenance staff, and members of the public may all access the site regularly. That higher footfall significantly increases both the likelihood of harm and the scrutiny applied if something goes wrong.
Courts don’t require commercial occupiers to guarantee that no tree will ever fail. Trees are living structures and complete certainty isn’t possible. What the law requires is that you have a reasonable, documented system for identifying foreseeable risks and responding to them proportionately – and that you can demonstrate this system was followed.
What a Reasonable Inspection Programme Looks Like
There is no single legally prescribed inspection interval for commercial trees. The National Tree Safety Group, whose 2024 guidance was produced in consultation with the Health and Safety Executive, takes a risk-based approach built around three factors: the condition of the trees, the setting they grow in, and the number of people likely to be affected if a tree were to fail.
In practice, this means applying a zoning approach across your site:
- High-use areas – car parks, pedestrian routes, play areas, building entrances, and areas below overhanging trees – warrant annual or more frequent inspection, given the volume of people and the potential consequences of a failure
- Moderate-use areas – shared courtyards, communal gardens, and estate roads with regular but lower footfall – are typically suited to inspection every 18 to 24 months, adjusted for tree condition and species
- Low-use areas – boundary planting, service yards, and land with restricted access – may require less frequent formal assessment, provided there is a clear system for reporting changes and responding to them
Beyond scheduled inspections, reactive checks are needed after significant weather events, any report of tree damage or visible deterioration, and following construction activity that may have affected root systems nearby. Our guide on tree safety reports for London property owners explains how risk assessment findings translate into clear, actionable recommendations.
The Importance of Written Records
Documentation is not a secondary concern – it is often the deciding factor in whether a landlord or property manager can defend their position if an incident leads to a claim or prosecution. A written inspection record that is dated, identifies specific trees, records the findings, and sets out recommended actions with a timescale demonstrates that a system existed and was being followed. An absence of records, or records that show recommendations were not acted upon, can be used as evidence of negligence.
What Type of Survey Does a Commercial Site Need?
The appropriate survey depends on the size of the site, the age and condition of the trees, and how intensively the land is used. Most commercial properties benefit from a formal tree safety survey carried out by a qualified arboriculturist, producing a tree schedule that records every tree’s condition, identifies any defects, and sets out time-bound recommendations for remedial works or re-inspection.
For larger sites – housing association estates, business parks, or multi-building commercial developments – a full tree management plan may be appropriate. This goes beyond a point-in-time survey to establish an ongoing inspection cycle, a prioritised works programme, and a clear process for managing trees across the whole estate over time.
Decay Detection for Older Trees
Where mature or veteran trees are present, visual inspection alone may not be sufficient to identify internal decay that could lead to structural failure. Advanced decay detection using acoustic tomography or resistograph drilling provides objective data on the extent of internal rot, allowing decisions about retention or removal to be made on solid evidence rather than appearance alone. This is particularly relevant on historic estates, older housing association stock, and any site where large trees grow close to buildings or pedestrian areas. For more detail on how this works, see our guide on tree decay detection in London.
Trees and Planning: An Additional Layer for Commercial Developers
For commercial landlords and developers involved in refurbishment, extension, or redevelopment of their sites, tree obligations extend into the planning process. Most London boroughs require a BS5837 tree survey before they will validate a planning application affecting trees, and where trees are to be retained during construction, an Arboricultural Method Statement is typically also required. Getting this right from the outset avoids costly delays and the risk of conditions being imposed that constrain construction programming.
Housing associations undertaking new build or infill development on their estates face the same requirements, with the added complication that existing mature trees on the estate may already carry Tree Preservation Orders that restrict what works are permissible. Our post on tree surveys for schools and educational properties covers a similar managed-estate scenario with overlapping compliance requirements.
Getting Your Compliance Documentation in Order
A properly structured tree safety survey, carried out by a qualified and experienced arboriculturist and updated at appropriate intervals, is the foundation of a defensible tree management position for any commercial property. According to the National Tree Safety Group’s 2024 guidance, a periodic formal inspection supplemented by the landowner’s own informal observations between survey dates – and prompt action if anything gives cause for concern – represents a reasonable and balanced approach to meeting your duty of care.
If you manage a commercial property, housing association estate, or multi-let site in London and need a tree safety survey, an ongoing inspection programme, or documentation to support a planning application, our team can provide the full scope of arboricultural services you need. Find out more about our tree safety report service and our tree survey and reporting services, or get in touch to discuss your site.