Great Crested Newt (GCN) Surveys &
eDNA Testing for Planning
Fast, planning-ready GCN assessments with predictable timelines, seasonal clarity and practical advice aligned to your programme.Â
Do you need a GCN Survey?
You may need a GCN survey if your site:Â
- contains a pond or seasonal waterbodyÂ
- lies within 250m of a pondÂ
- includes grassland, scrub, hedgerows or woodland edgesÂ
- has rubble piles, log stacks or damp refuge featuresÂ
- was flagged during a PEA for suitable terrestrial habitatÂ
Because GCN are a European Protected Species, planning authorities require clear evidence wherever habitat risk is identified. Early checks protect timelines, avoid seasonal delays and shape proportionate next steps.Â
Early Signs an GCN Survey is Needed
- Pond on-site or within 250mÂ
- PEA flagged GCN suitabilityÂ
- Grassland, hedgerows, scrub, woodland edgesÂ
- Rubble piles, log stacks, terrestrial refugeÂ
- LPA requested a GCN assessment if site is in a GCN risk zoneÂ
- Large footprints near waterbodies or ditchesÂ
If any apply, a GCN survey is usually required.Â
What We Deliver
| Service | Purpose | Outcome |
|---|---|---|
| GCN eDNA Testing | Fast presence/likely absence screening | Clear positive/negative result |
| Habitat Suitability Index (HSI) | Early risk scoring | Practical suitability rating |
| Presence/Likely Absence Surveys | Alternative to eDNA Testing | Robust evidence for planning |
| Population Surveys | Gives an estimate of the population size | Data for mitigation/licensing |
| Mitigation & Licensing | If impacts are unavoidable | Planning-ready solutions |
How it Works
Scope & Schedule
Send the site location and timeframe. We confirm whether eDNA is eligible or if seasonal surveys are required.
Fieldwork
eDNA sampling (April–June) or multi-visit presence/absence surveys depending on need
Reporting
Planning-ready reports, clarity for planners, and next steps for your programme.
Timing & Survey Windows
Missing the eDNA window usually means waiting until the next survey season. Early booking protects your timeline.Â
eDNA Testing
Mid April – June
Presence/ Likely Absence Surveys:
Mid March – Mid June
Population Surveys
Mid April – June
Licensing
Seasonally Dependent
What You Receive:
- eDNA results (positive/negative)Â
- HSI scoringÂ
- Presence/absence or population dataÂ
- Planning-ready reportingÂ
- Clear mitigation/licensing guidanceÂ
- Reliable timelines and next stepsÂ
Evidence for planners. Clarity for project teams.Â
Why Developers Choose ProHort:
- Programme-first schedulingÂ
- Planning-focused reportingÂ
- Straight, practical recommendationsÂ
- Reliable survey capacityÂ
- Support through licensing where requiredÂ
Legal Compliance & Planning risk
GCN surveys are required under UK law when suitable habitat exists. Missing or incorrect evidence can lead to:Â
- Planning refusal or validation delaysÂ
- Stop-work noticesÂ
- Enforcement penalties for disturbing GCNÂ
- Licence requirements late in the programmeÂ
- Seasonal delays (eDNA and survey windows are fixed)
Relevant legislation includes:
- Conservation of Habitats and Species Regulations 2017Â
- Wildlife & Countryside Act 1981 (Schedule 5)Â
ProHort ensures your evidence is clear, proportionate and aligned to your build schedule.Â
Your Next Step
Need GCN or eDNA surveys? Let’s confirm your route and secure your survey window.Â
Phone: 0800 494 7479Â
Email: [email protected]Â
Areas We Cover
We cover many areas across England and Wales. Click below to find out more.
Case Note
GCN Survey FAQs
What is eDNA testing for great crested newts?
Environmental DNA, commonly referred to as eDNA, is a survey method used to detect the presence of great crested newts by analysing water samples from ponds. As newts shed DNA into the water through skin cells, mucus, and waste, laboratory analysis can confirm whether the species is present without needing to physically capture or observe individuals.
When is the eDNA survey season for great crested newts?
eDNA surveys are seasonally constrained and can only be undertaken between mid April and the end of June. This period aligns with the breeding season when great crested newts are most likely to be present in ponds, ensuring reliable detection results for planning purposes.
Is eDNA testing accepted by local planning authorities?
Yes. eDNA testing is widely accepted by local planning authorities as a valid method of presence or likely absence assessment for great crested newts, provided it is carried out in accordance with recognised guidelines.
For validation requirements, you should always refer to your local authority guidance, for example:
https://www.planningportal.co.uk/
Do you need a licence to carry out eDNA testing?
A licence is not required to undertake eDNA sampling itself. However, surveys must be carried out by a competent ecologist, and any follow up surveys or mitigation works involving great crested newts may require a licence from Natural England.
How accurate is eDNA testing for great crested newts?
eDNA testing is highly reliable when undertaken within the correct seasonal window and following standard methodology. It is designed as a presence or likely absence tool, meaning it can confirm whether newts are present, but it does not provide population size or distribution data.
What happens if great crested newts are detected?
If a positive result is returned, further surveys will typically be required. This often involves traditional presence surveys, such as torchlight surveys or bottle trapping, to establish population size and inform any mitigation strategy required for planning.
What happens if no great crested newts are found?
A negative eDNA result is generally accepted as evidence of likely absence. This can allow planning applications to proceed without the need for further surveys, provided there are no other ecological constraints identified on site.
How is an eDNA survey carried out on site?
The process involves collecting multiple water samples from around the perimeter of a pond using sterile equipment. These samples are then combined and sent to a laboratory for analysis. The survey is quick, non intrusive, and does not disturb habitats or wildlife.
How long does it take to receive eDNA results?
Once samples are submitted to the laboratory, results are typically returned within a few working days. This makes eDNA one of the fastest methods available for assessing great crested newt presence in support of planning.
Do all ponds require eDNA testing?
Not all ponds require testing. A Preliminary Ecological Appraisal or site assessment will determine whether ponds are suitable for great crested newts and whether eDNA testing is required to support a planning application.
Can eDNA replace traditional great crested newt surveys?
eDNA can replace initial presence surveys, but it cannot replace population assessments. If newts are detected, traditional survey methods are still required to inform mitigation, licensing, and development design.
What factors can affect eDNA survey results?
Several factors can influence results, including water quality, pond disturbance, seasonal timing, and sample handling. This is why surveys must follow strict protocols to ensure results are valid for planning submission.
Is eDNA testing suitable for all development sites?
eDNA testing is suitable where ponds are present within or near a development site and there is potential for great crested newts. It is commonly required for residential, commercial, and infrastructure projects where ecological constraints may apply.
Why is eDNA testing important for planning applications?
Great crested newts are a protected species under UK law, and planning authorities require evidence that development will not harm them or their habitats. eDNA testing provides a robust and efficient way to inform planning decisions and avoid delays.
Can eDNA detect other species?
While standard eDNA testing for planning focuses on great crested newts, the method can be adapted to detect other species. However, separate testing protocols are required depending on the species being targeted.
