Preliminary Ecological Appraisal
A Preliminary Ecological Appraisal (PEA) identifies risks and opportunities early in your development project, recording protected habitats and species on-site to determine the need for future surveys.
In a nutshell
Seasonality: Anytime (Optimal: April to September)
Survey type: Desk study, field survey
Report lead time: 3-5 working days (from survey completion)
Report validity: 12-18 months
What is a Preliminary Ecological Appraisal?
A Preliminary Ecological Appraisal (PEA) is usually the first step in the ecological assessment process, and is a key requirement for any proposed development.
It helps to identify features of ecological interest on or near your site, inform the mitigation hierarchy (avoidance, mitigation, enhancement and compensation) and determine if further protected species surveys are necessary ahead of works.
Also referred to as Extended Phase 1 Habitat Surveys or Phase 1 Ecology Surveys, PEA surveys aim to develop a clear understanding of the proposed development site, highlighting potential impacts on protected habitats and species early on.
The resulting report is compiled through a three-part approach: a detailed desk study, an on-site walkover survey, and a reasoned evaluation of ecological constraints, risks and opportunities.
When is a PEA required?
Preliminary Ecological Appraisals are designed to inform planning applications so that the proposed development can continue lawfully without a detrimental impact on wildlife.
An assessment is commonly required where:
- Development affects or is adjacent to buildings, trees or structures with potential to support protected species (e.g. bats or nesting birds).
- Planning application is likely to impact habitats such as grassland, woodland, hedgerows or scrub.
- Works are proposed near watercourses, ponds or wetlands.
- A development site is located within or close to a designated site for nature conservation.
- The local planning authority requests ecological information to determine an application.
Survey seasonality
A PEA can be undertaken at any time of year, although between April and September is optimal.
To reduce the risk of project delays, appraisals should be engaged in good time to allow for further surveys to be performed, if required.
Optimal Survey Season
Sub-Optimal Survey Season
Survey Not Possible
Preliminary Ecological Appraisal
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Our Preliminary Ecological Appraisal process
We approach every PEA with diligence and professional judgement, guided by over 20 years of ecological experience.
01
Contact us for a quote
The process starts when you reach out to our friendly team. We answer all quote requests within 24 hours, providing clear guidance on the cost of your PEA survey.
02
PEA desk study & walkover
We’ll begin the PEA process, requesting and reviewing the required data search from the biological records centre. We’ll also organise and perform a walkover study of your site.
03
Additional surveys
PEAs are often conducted in conjunction with a Preliminary Roost Assessment (PRA) or a Ground Level Tree Assessment (GLTA), depending on the area’s geography.
04
Report Delivery
Once we have the information we need, you can expect your bespoke PEA report and recommendations to be delivered to you within 3-5 working days.
01
Contact us for a quote
The process starts when you reach out to our friendly team. We answer all quote requests within 24 hours, providing clear guidance on the cost of your PEA survey.
02
PEA desk study & walkover
We’ll begin the PEA process, requesting and reviewing the required data search from the biological records centre. We’ll also organise and perform a walkover study of your site.
03
Additional surveys
PEAs are often conducted in conjunction with a Preliminary Roost Assessment (PRA) or a Ground Level Tree Assessment (GLTA), depending on the area’s geography.
04
Report Delivery
Once we have the information we need, you can expect your bespoke PEA report and recommendations to be delivered to you within 3-5 working days.
Project outcomes for Preliminary Ecological Appraisals
The findings from the desk study and field survey will be brought together in a clear, planning-ready ecological assessment. This will typically include:
- Information on the site’s potential to support protected and notable species.
- Whether the proposed development is likely to result in ecological impacts.
- Application of the mitigation hierarchy and recommended ecological enhancements.
- Clear identification of whether further species-specific surveys are required, and why.
- Reasoned recommendations to inform and support the planning application.
All of our reports are prepared in accordance with the latest CIEEM guidance for ecological report writing, ensuring they are robust, transparent and suitable for submission to local planning authorities.
Please note: Any further species surveys or ecological work required will be specified and quoted for separately.
Why choose aLyne Ecology for your PEA?
At aLyne Ecology, our ecologists combine technical rigour with a responsive, well-organised approach, delivering surveys efficiently without compromising on quality. With over 20 years’ experience, you’ll receive clear, concise ecological advice tailored to your project and needs.
Quick turnaround
Following survey completion, we can offer an efficient, reliable turnaround of 3-5 working days on protected species reports.
Streamlined process
Our small team and organised in-house processes mean we can quickly mobilise, keeping projects moving without unnecessary delay.
Fully compliant reports
All of our reports meet the survey standards set out by CIEEM and BS 42020, giving you peace of mind when submitting applications.
Friendly, expert team
Our ecologists are fully-trained, friendly & experienced. We’re dedicated to delivering the best outcomes for your project & nature.
Get a Preliminary Ecological Appraisal quote
A Preliminary Ecological Appraisal is usually the first but also the most important step in getting your planned development approved without delays or a negative impact on local protected wildlife.
For clear, compliant ecological advice and assessment from a team that cares, contact our experts today to discuss your needs or request a PEA survey quote.
Contact details
info@alyneecology.co.ukGet a Preliminary Ecological Appraisal quote
A Preliminary Ecological Appraisal is usually the first but also the most important step in getting your planned development approved without delays or a negative impact on local protected wildlife.
For clear, compliant ecological advice and assessment from a team that cares, contact our experts today to discuss your needs or request a PEA survey quote.