Arboricultural Impact Assessments
An Arboricultural Impact Assessment (AIA) is a detailed written report that evaluates how a proposed development may affect the existing trees within and around a site. It considers the condition, value, and location of each tree, alongside the design and layout of the project, to determine the potential impacts of construction activities.
The assessment identifies risks to tree health and stability, but also recommends mitigation measures. An AIA can support developers, planners and local authorities to make informed decisions. Therefore, ensuring that trees are properly safeguarded and planning applications comply with any relevant regulations.
It is a recommendation of the British Standard 5837: 2012 Trees in relation to design, demolition & construction – Recommendations, that an Arboricultural Impact Assessment is produced in order to inform the development process.
What the Assessment Identifies
The Arboricultural Impact Assessment identifies trees to be removed and those to be retained, and it highlights the potential conflicts between retained trees and the planned development. Typical conflicts between trees and developments can range from crown shading issues of a tree to a planned development breaching a tree’s Root Protection Area (RPA).
Additionally, the Arboricultural Impact Assessment also considers the impact of statutory designations such as tree preservation orders (TPOs), and identifies the long-term value and benefits of trees in the urban and built environment.
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Frequently Asked Questions About Arboricultural Impact Assessments
What is an Arboricultural Impact Assessment?
An Arboricultural Impact Assessment (AIA) is a detailed report that evaluates how a proposed development may affect existing trees on or near a site. The assessment identifies potential conflicts between trees and development plans and recommends measures to protect retained trees during construction.
When is an Arboricultural Impact Assessment required?
An Arboricultural Impact Assessment is typically required when a planning application involves development near existing trees. Local Planning Authorities may request an AIA to demonstrate that trees have been properly considered and protected as part of the design process.
What is the difference between a BS5837 Tree Survey and an Arboricultural Impact Assessment?
A BS5837 Tree Survey records the condition, quality, and location of trees on a site. An Arboricultural Impact Assessment uses this survey information to assess how a proposed development will affect those trees and what mitigation measures may be required.
What does an Arboricultural Impact Assessment include?
An Arboricultural Impact Assessment typically includes:
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Tree constraints and opportunities
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Root Protection Area (RPA) analysis
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Trees proposed for removal or retention
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Potential impacts of construction works
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Tree Protection Plan recommendations
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Mitigation and management measures
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Consideration of Tree Preservation Orders (TPOs)