Why do I need a tree survey?

Anyone who owns or manages land containing trees has a legal duty to ensure that they are in a safe condition so that foreseeable damage does not occur due to tree failure (Occupiers Liability Act 1954/1980). Commercial premises have a further obligation under the Health and Safety at Work Act 1974 to undertake regular tree surveys so that trees do not cause foreseeable damage. Guidance issued by the Government, the Forestry Commission and the Arboriculture Association advise that a tree survey is regularly undertaken by a professional tree surveyor. Failure to do so may leave those responsible liable to prosecution.

Twig will undertake a tree survey to identify hazardous trees and our tree report will make prioritised recommendations to reduce owner liability. An inspection frequency will ensure that funds are not wasted inspecting healthy trees in future tree surveys.

Our visually engaging, accessible, and intuitive tree risk assessment report includes:

  • GPS plotted trees transposed onto site plans.
  • Colour coding to highlight the defective trees, making it easy for tree surgeons to identify the defects and undertake the correct remedial action.

Tree surveys and risk assessment reports 

Twig provides professional health and safety tree surveys, enabling our clients primarily from large estates, councils (parish, local, district and county) and schools to understand and manage risks associated with trees they own or that affect their property.

While we look at all the trees, we can only record ‘risks’ where it is necessary or clearly evident – using our experience and judgement to make pragmatic decisions – thus keeping the cost manageable. Alternatively, we can record and plot all trees if required.

Tree risk assessment 

Our tree risk assessment always starts with understanding our client priorities including safety, aesthetic, and risk areas. We will efficiently and accurately collect all the data (up to 40 individual elements per tree) needed in one site visit.

Walk-over tree survey

This is the most economical type of tree survey. All trees will be inspected, but only details of those trees which are potentially hazardous are recorded within the tree report. Clients with a large number of trees and a limited budget tend to favour this type of tree survey.

Full tree survey

This is the next level of the tree survey whereby details of all trees are recorded within the tree report. This type of tree survey suits clients who wish to have a full inventory of trees within their care.

Quantified tree risk assessment tree survey (QTRA)

Twig are licensed users of the QTRA System and are able to undertake tree surveys which quantify risk. A figure representing the probability of significant harm occurring is included within the QTRA Tree Report. This type of tree survey is often favoured by those responsible for a very large tree stock.

Decay detection tree survey

This type of tree survey assesses the extent of decay deep within the tree. This requires the use of specialist tree survey equipment such as a resistograph, or the ultrasound Picus Tomograph machine.

Aerial tree survey

Occasionally defects are apparent but their extent cannot be determined during a ground level tree survey, in which case the tree surveyor may recommend that a climbed tree survey is undertaken.

Remedial works

A Tree Survey may identify potential hazards, which require remedial work. Twig can support you with any work identified. Click here for details.

Our tree surgeons have experience working in these sectors

  • Local Authorities or County Council Contracts
  • Facility Management
  • Parish Councils
  • Schools
  • Utility Schemes
  • Housing Developments
  • Renewable Energy

Other services

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TWIG Group is part of the RSK group of companies

The RSK group is a leading integrated environmental, engineering and technical services business offering bespoke end-to-end solutions to a variety of sectors. Headquartered in the UK but with an established presence throughout Europe, Africa, the Middle East, Asia and Australia, RSK helps organisations around the world achieve their business aspirations in a sustainable and efficient manner.