Arboricultural Impact Assessment (AIA)
What is an Arboricultural Impact Assessment?
An Arboricultural Impact Assessment (AIA) is a critical document required by Local Planning Authorities (LPAs) to support planning applications where trees are present on or near a development site. It forms a key part of the BS 5837 process, providing a robust evaluation of how your proposed design interacts with the existing tree stock.
The primary purpose of an AIA is to identify any potential conflicts between the development and the retained trees, such as incursions into Root Protection Areas (RPAs), shading, or spatial dominance. Where conflicts exist, the AIA provides professional, practical mitigation strategies to ensure the long-term health of the trees and the successful progression of your planning application.
Why Do You Need an AIA?
Local Planning Authorities have a statutory duty to consider the protection and planting of trees when granting planning permission. If your project has the potential to affect trees, the council will require an AIA to demonstrate that you have thoroughly considered their retention and protection.
Attempting to submit a planning application without a comprehensive AIA when trees are present will almost certainly lead to costly delays, requests for further information, or an outright refusal. A well-prepared AIA clears a path for planning officers to approve your application with confidence.
What is Included in Our AIA Reports?
We pride ourselves on producing reports that are highly technical yet exceptionally clear and easy for planning officers to read. Our AIA process typically includes:
- Evaluation of Tree Impacts A detailed analysis of the direct and indirect impacts the development will have on retained trees, including an assessment of Root Protection Area (RPA) incursions.
- Practical Mitigation Strategies Where conflicts are identified, we propose solutions such as specialist foundation designs, permeable surfacing, or targeted pruning to resolve issues and protect the trees.
- Tree Protection Plan (TPP) An AutoCAD-produced plan illustrating the exact location of temporary protective fencing and ground protection to safeguard trees during the construction phase.
- Arboricultural Method Statement (AMS) Depending on the complexity of the site, we often supply an AMS alongside the AIA. This document outlines the precise methodology for carrying out construction activities near trees safely.
Frequently Asked Questions
Here are answers to some common questions we receive regarding Arboricultural Impact Assessments.
Do I always need an AIA for a planning application?
If there are trees on your site, or on adjacent land close to the boundary, the local planning authority will usually require an AIA to validate your application. We can review your site plans to advise whether an assessment is strictly necessary.
What happens if my proposed extension overlaps a Root Protection Area (RPA)?
An overlap does not automatically mean your application will be refused. Within the AIA, we can propose appropriate mitigation measures, such as using pile and beam foundations or cellular confinement systems, to ensure the root system remains viable and undisturbed.
Will an AIA help me get planning permission?
Yes. By demonstrating to the council that tree impacts have been professionally assessed and successfully mitigated according to BS 5837 standards, an AIA removes a major hurdle and significantly improves the likelihood of achieving planning consent.
How long does it take to produce an AIA?
We pride ourselves on fast turnaround times. Following the initial site survey and receipt of your finalised layout drawings, we typically prepare and deliver the completed AIA report within a few working days to keep your project on schedule.
Let's discuss your project
Contact Canopy IQ today for intelligent tree solutions and expert arboricultural advice across Kent, East London, South East London, and beyond.
Whether you need an Arboricultural Impact Assessment for planning, or expert advice on managing your trees, our experienced team is here to help.