ACP Insights & Guidance
Bat survey photographs are useful when they explain the works and show their limitations. Use safe, lawful viewpoints and a clear photo index to help your ecologist understand the brief.
The practical answer
Provide context, dates, drawing references and honest limitations. Photographs support a scoping discussion; they cannot prove bat absence or replace the fieldwork the project needs.
Use photographs to explain the works, not diagnose bats
Bat survey photographs can help an ecologist understand the building, surrounding context and proposed changes. Their value depends on clear labels and an honest account of what they do not show. A sharp image is still only one view at one moment.
Photographs cannot establish that bats are absent or replace required fieldwork. The ecologist decides the survey scope and whether further evidence is needed. For the wider assessment process, see ACP’s preliminary roost assessment guidance.
First ask which views would help the brief. Then collect only those available safely and lawfully, or use suitable existing photographs. A small, well-indexed set is more useful than many unexplained files.
Keep the collection safe and non-intrusive
Use ordinary accessible viewpoints where you have permission to be. Do not lift tiles, remove materials, inspect cavities or enter unsafe roof spaces to obtain a photograph. Likewise, do not move vegetation or disturb a feature to improve the view.
If a requested area cannot be photographed safely, record that limitation and ask the ecologist how to proceed. Do not use a general checklist as permission to approach a suspected roost. The government’s bat protection guidance explains why disturbance and interference matter.
Keep unnecessary personal information and security details out of the shared pack. Use the agreed project channel, and identify any sensitive images before wider circulation.
Agree a focused photograph list
| Record | Check and action |
|---|---|
| Whole-building context | Show the building and its immediate setting from a safe viewpoint. Explain which building is relevant if several appear in the frame. |
| Relevant elevations | Identify the side of the building and direction of view. Connect each image to a plan or elevation reference. |
| Proposed works area | Show where the alteration is proposed, using the current drawing as context. Keep any annotation separate from the unedited original. |
| Accessible external details | Include closer views only where they are safely available without intervention. State the feature and viewpoint without making a bat-presence conclusion. |
| Known gaps | Record areas that are obscured, inaccessible or absent from the photograph set. Explain why, rather than guessing what lies beyond the view. |
The ecologist may adapt this list to the building and proposal. For example, an existing photograph may help explain a previous layout, provided its date and changed condition are clear. Do not present it as a current view.
Match the views to a photograph register
| Record | Check and action |
|---|---|
| 1 · Context | File: example-building-context-2026-10-20.jpg. View: building from the permitted courtyard, looking north. Drawing: site plan SP-01 rev B. Limit: rear elevation not visible. |
| 2 · Front elevation | File: example-front-elevation-2026-10-20.jpg. View: front face from ground level. Drawing: elevation EL-02 rev C. Limit: no internal roof-space view. |
| 3 · Works area | File: example-works-area-2026-10-20.jpg. View: proposed window alteration. Drawing: proposal PR-03 rev A. Limit: photograph shows the existing external face only. |
| 4 · External detail | File: example-visible-eaves-2026-10-20.jpg. View: eaves visible from an ordinary ground-level position. Drawing: EL-02 rev C. Limit: no close inspection or cavity view. |
These filenames and references are fictional examples. In a real index, add the photographer or source, capture date, direction of view and a short factual description. Keep the original image and any marked-up copy clearly distinguishable.
Write factual captions and disclose gaps
Useful caption
Front elevation, looking north, photographed 20 October. Proposed window alteration shown on PR-03 rev A. Roof interior and rear elevation are not shown.
Unsupported conclusion
“No bats in this roof” goes beyond what a photograph can establish. Replace it with the visible facts and the limits of the view.
If an image is blurred, partly obscured or taken before a change, say so. In addition, identify images supplied by somebody else when their capture date is uncertain. The ecologist can then decide how much weight to give them.
When the proposal changes, update the drawing reference and identify which photographs remain useful. A new filename alone does not explain whether the scene, works area or design has changed.
Send the photographs with the brief
Send the image index together with the site location, current works description and relevant drawings. Explain the decision you need help with, such as defining the assessment scope for a proposed alteration.
- Every image has an identifiable location and capture date, or states that the date is unknown.
- The relevant plan and proposal revisions are clear.
- The pack distinguishes current views from older background images.
- The index records obscured areas and access limitations.
- The collection involved no unsafe access or disturbance.
- The appointed ecologist makes the technical interpretation.
For the wider scope of fieldwork and planning evidence, see ACP’s bat survey service. This checklist supports the initial conversation; it is not a survey method.
Questions about bat survey photographs
Can photographs replace a bat survey?
No. They can help explain the site and proposed work, but cannot establish bat absence or replace required fieldwork. The ecologist determines the evidence and assessment scope.
What should the photograph index contain?
Include a file identifier, date, location, direction of view, relevant drawing and short factual description. Also record limitations, such as an obscured elevation or an image showing an earlier condition.
What if I cannot photograph part of the building safely?
Record the gap and explain why the view is unavailable. Then ask the ecologist what information is needed; do not access unsafe areas or disturb features to complete the list.
Can I send existing photographs?
Yes, where they are relevant and you can share them lawfully. State their date and source, and explain any changes since capture. Clearly label an unknown date rather than estimating it.
References and scope
- Bat Conservation Trust: Bat Surveys for Professional Ecologists — Good Practice Guidelines, 4th editionProfessional survey guidance. This client briefing checklist does not reproduce or replace the specialist survey methods.
- Natural England and Defra: Bats — protection and licencesExplains protected status and activities that may harm bats or their roosts.
Sources checked 29 October 2026. This guide supports project coordination in England; apply the current documents and specialist advice for your scheme.