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A dead branch overhead might not look like much. But above a busy footpath, a car park, or a building entrance, it represents a genuine and foreseeable risk, and one that site managers and duty holders are legally required to address. The trouble is that deadwood rarely announces itself. By the time it’s obvious, it may already be dangerous.
Managing that risk properly isn’t complicated, but it does require a clear process: the right inspections, a prioritised works programme, and a maintenance cycle that keeps pace with how trees actually change. Here’s what that looks like in practice.
Healthy wood is held in place by living tissue. Dead branches have lost that connection. The wood dries, contracts, and becomes brittle. Crucially, it can detach with very little warning, even on a still day. This phenomenon, sometimes called “summer branch drop,” is well documented among arborists and can affect apparently stable trees without any visible precursor.
The consequences depend entirely on where that branch falls. In a remote woodland, a fallen limb is unremarkable. Above a car park entrance, a school playground, or a pathway used daily by staff and visitors, the same event becomes a potential serious injury, or worse.
Removal of deadwood is normally only recommended where it presents an unacceptable risk of harm, which is why the emphasis in professional tree management is always on where a tree stands, not just what condition it’s in. Deadwood over high-footfall areas sits in a different risk category entirely from deadwood in low-use green space.
If you manage or occupy a commercial site, you have a legal obligation to take reasonable steps to keep people safe on your land. Landowners owe a duty of care to anyone who comes onto their land, whether authorised visitors under the Occupiers’ Liability Act 1957 or trespassers under the more limited duties of the 1984 Act. Employees, contractors and volunteers are generally covered separately by the Health and Safety at Work Act 1974.
The key word in all of this is “reasonable.” You are not expected to eliminate every conceivable risk, but you are expected to identify foreseeable hazards and have a credible strategy for managing them. Trees, and deadwood in particular, fall squarely into this category.
Case law reinforces the point. In Witley Parish Council v Cavanagh, a tree leaning over a road caused serious injury to a passing bus driver. It was held that structural decay could have been found had the Parish Council inspected the trees along their boundary more regularly. By contrast, in Parker v National Trust, the court ruled that the Trust was not liable for injuries caused by a falling branch, because it had a robust tree inspection regime aligned with industry standards. The difference between those two outcomes was documentation and process.
That’s what duty holders need to demonstrate: not that nothing ever went wrong, but that they took proportionate, evidenced steps to manage the risk. Tree risk assessments carried out by qualified arborists are the foundation of that evidence.
Not every tree on a site needs the same level of attention. One of the most important things a qualified arborist brings to an inspection is a structured way of determining which trees matter most, and in what order.
The National Tree Safety Group (NTSG) guidance requires that areas of land be defined according to levels of use, prioritising the most used areas. High-use zones require an inspection regime, while trees in areas with low public use require less frequent inspection. Examples of high-use zones include areas used by many people every day, such as busy roads, other well-used routes, car parks and children’s playgrounds.
In practice, this means an arborist will map your site into zones based on footfall and occupancy, then assess each tree against two factors: the likelihood of failure and the consequences if it does fail. A dead branch 10 metres above a rarely-used service road is a lower priority than a much smaller piece of deadwood hanging directly above a main entrance. The target (the people and property below) is what drives the risk score.
The output is a prioritised schedule of works, with timescales attached, so you know what needs addressing urgently, what can be planned into routine maintenance, and what simply needs monitoring. Understanding the signs that a tree is hazardous is part of that assessment, and a good inspection report will explain the findings in plain terms alongside the recommendations.
A one-off inspection and clearance programme is a good start. But trees change continuously, through growth, seasonal stress, storm damage, and disease. As a result, a single visit won’t keep you covered indefinitely. The goal is a rolling programme that matches inspection frequency to the risk profile of each zone.
The NTSG advises a proportionate approach: high-use areas such as near roads or footpaths should have regular inspections, typically every one to three years, while low-use areas require less frequent inspection unless concerns arise.
Practical integration into your maintenance cycle might look like this:
On seasonal planning for tree works, timing matters more than people often realise. Some deadwood removal can be carried out year-round, but other works are better scheduled around quieter site periods, nesting seasons, and the operational calendar of your site. Good tree management integrates all of these considerations rather than treating tree works as a reactive afterthought.
Crucially, a well-structured programme also creates the audit trail you need. Inspection reports, risk assessments, works completion records: these are the documents that demonstrate your duty of care has been actively managed, not just acknowledged.
Deadwood removal on a commercial site is not a simple job, and it’s not one for general grounds maintenance staff. The work requires trained arborists with the right equipment. It often involves aerial work, rigging systems, and careful control of falling material to protect people and property below.
Understanding what an arborist does during a deadwood removal job helps set expectations. A qualified arborist will assess each branch before working on it, use appropriate access methods (from ground-based equipment to climbing), and control the removal in a way that minimises disruption.
Where trees are close to buildings, parking areas, or live pedestrian routes, that level of precision is essential. Work should comply with BS3998:2010, the British Standard for tree work, which sets out best practice for specification, execution, and aftercare.
Where a tree has deteriorated to the point that routine removal isn’t sufficient (for example, following storm damage or sudden structural failure) emergency response may be required. Having a contractor relationship already in place before an emergency arises means a faster response and a team that already knows your site.
We work with commercial clients across Preston and Lancashire to put the right tree safety processes in place, from initial surveys and risk assessments through to planned deadwood removal programmes and emergency cover.
Our team holds ARB Approved Contractor status through the Arboricultural Association and Constructionline Gold accreditation, so you can be confident the work meets industry standards and provides a defensible record of your duty of care.
Whether you’re starting from scratch with a site survey, or looking to formalise an existing maintenance arrangement, Great Oaks can help you build a practical, proportionate approach that works for your site. Get in touch with the team to discuss your requirements.
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office@greatoakstreeservices.co.uk
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Climbing, grounds maintenance and utility work.Climbing, grounds and utility work.
Arboricultural Association Approved Contractor.
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Starts Monday 19 October 2026
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Entry requirements: Ground Based Chainsaw Operator and Tree Climbing and Aerial Rescue
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