Arboricultural Impact Assessment Explained: What You Need to Know for Planning

An Arboricultural Impact Assessment (AIA) is often required for planning applications where trees are present. It looks at how a development may affect trees on or near a site. This helps ensure trees are properly considered before work begins. 

Trees are an important part of a landscape. They provide environmental, ecological and visual benefits. Because of this, local planning authorities require clear information on how development will impact them.

At Elite Ecology, we provide Arboricultural Impact Assessments across the UK. At all stages of a project, we support developers, architects, and landowners. Our goal is to help your development progress while protecting important trees.

What Is An Arboricultural Impact Assessment?

An Arboricultural Impact Assessment (AIA) is a report used in the planning process. It assesses the relationship between trees and a proposed development. 

The report will:

• Identify trees that should be retained or removed.

• Highlight potential conflicts with construction.

• Recommend protection measures.

• Support planning decisions.

It also considers how construction may affect tree roots, canopies and long-term health.

When is AIA Important?

Trees add significant value to a site. It improves air quality, supports wildlife, and enhances the surrounding environment. As a result, they are protected by planning policies.

Without an AIA, your planning application may face delays or refusal. Before making a decision, planning officers must comprehend the impact on trees.

An AIA also helps reduce the risk; identifying constraints early allows designs to be adjusted before submission. This can save both time and cost later in the project.

When is AIA Required?

An Arboricultural Impact Assessment (AIA) is typically required where proposed development has the potential to impact existing trees. This includes:

• New residential or commercial developments.

• Extensions close to existing trees.

• Infrastructure or access works.

• Sites within Conservation Areas.

• Trees protected by Tree Preservation Orders.

Even small developments may need an AIA if trees are nearby; early advice is always recommended.

What Is Included?

An Arboricultural Impact Assessment  includes several key components.

Firstly, a detailed tree survey will record the species, size, condition, and quality of each tree. The trees are categorised using BS5837 standards. Secondly, a Tree Constraints Plan shows tree locations and Root Protection Areas, highlighting where development may be restricted. Thirdly, an impact assessment to explain how construction could affect trees, for example, excavation within root zones or building too close to trunks. And finally, a recommendations and mitigation report to provide practical solutions. This may include protective fencing or changes to layout or construction methods such as no-dig surfaces.

These steps help ensure trees are protected throughout the development process.

Planning Around Trees

Trees should be seen as an asset, not a constraint. With the right approach, they can be retained and enhanced as part of a development. 

An Arboricultural Impact Assessment helps to balance development needs with environmental responsibility. It ensures trees are protected while allowing projects to progress. If you are planning a development, seeking advice early is essential. Understanding tree constraints from the start can help avoid delays and keep your project on track.

How Elite Ecology Can Support Your Project

Elite Ecology provides clear and practical Arboricultural Impact Assessments. We prioritise early engagement to identify tree constraints before finalising designs. Our reports are easy to understand and tailored to planning requirements. 

Speak with our friendly and experienced team to have any questions answered and learn more about our AIA.