Tree Surveys and Risk Assessment Reports
Twig provide 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 any risk to and from their trees.
While we look at all of the trees we can only record ‘risks’ where it is necessary – 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.
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.
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 advises 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.
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 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.
Climbed 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.
Our tree surgeons are comfortable working in these sectors:
- Local Authorities or County Council Contracts
- Facility Management
- Parish Councils
- Utility Schemes
- Housing Developments
- Renewable Energy