Arboricultural Impact Assessments (AIA)
Arboricultural Impact Assessments (AIA) are a key part of the planning and development process. They evaluate how proposed works will affect existing trees, and how those trees might influence the design.
Planning & Legal Framework
​A professional AIA identifies potential conflicts between trees and construction activities, helping developers reduce risk, protect high value trees, and meet local planning and environmental requirements.
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At North West Tree Management we carry out detailed Arboricultural Impact Assessments across Chester, Cheshire and the North West. Our reports provide clear practical recommendations that help projects move forward smoothly while maintaining biodiversity, landscape value, and compliance with UK planning policies.
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AIA's are frequently required by planning authorities and align with key UK legislation, including:
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The Town and Country Planning Act 1990 protects trees under the Tree Preservation Orders (TPOs) and within conservation areas.
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The Planning (Listed Buildings and Conservation Areas) Act 1990 safeguards trees contributing to heritage and conservation settings.
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The Wildlife and Countryside Act 1981 protects wildlife such as nesting birds and bats that may inhabit trees on development sites.
Arboricultural Method Statements (AMS)
An Arboricultural Method Statement (AMS) follows an AIA and provides a detailed step-by-step plan for protecting trees during development. It ensures all mitigation measures identified in the AIA are put into practice on site.
A Comprehensive AMS Typically Includes:
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Tree Protection Measures: Fencing, ground protection and Root Protection Area (RPA) specifications to prevent damage.
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Construction Guidance: Safe methods for excavation, service installation and landscaping near trees.
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Monitoring & Supervision: Appointing a qualified arboricultural consultant to oversee works and ensure compliance.
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Contingency Planning: Outlining how to respond if accidental damage or root disturbance occurs.
Why an AMS Matters
An AMS makes sure everyone involved, contractors, site managers and planners understand their responsibilities for tree protection. It translates the survey recommendations into clear, actionable site practices, reducing the risk of non-compliance, enforcement notices or project delays.
By integrating an AMS with your Arboricultural Impact Assessment you can demonstrate your commitment to responsible development, legal compliance and sustainable environmental management.
Contact us today to arrange your Arboricultural Impact Assessment in Cheshire and across the North of England.