Bats and Roof-nesting Birds (BARB) Enquiries


A Bats and Roof-nesting Birds enquiry is ideal for small scale developments, such as extensions and attic conversions. This product was developed in accordance with the Bat Conservation Trust's 'Bat Surveys for Professional Ecologists: Good Practice Guidelines, 2016'. The results will include records of bats within a 2km buffer and roof-nesting birds within a 150m buffer.

A Data Enquiry and Release Form must be completed and signed before any data can be released. This document is available to download below; please send completed forms to


Data Enquiry and Release Form


There will be no quoting process, as BARBs have a set fee of £100 plus VAT. Results will be provided within 5 working days of reciept. Results are provided via Aderyn (the LERC Wales' Biodiversity Information & Reporting Database).


Instructions on how to interpret BARB results on Aderyn are available here [pdf]. A summary of the process is shown below:

Step 1: Customer completes DERF and emails to

Step 2: SEWBReC logs details on Aderyn and runs the search, with results being automatically emailed to the customer on completion.

Step 3: Customer clicks on link in email for results on Aderyn, which will include interactive online tables, interactive maps and downloadable reports and GIS files. Please download the guide to interpreting these results here.

Step 4: SEWBReC emails invoice to customer.


The species included under the term 'roof-nesting birds' are: house sparrow, swallow, house martin, swift, barn owl, peregrine, kestrel, starling, jackdaw, pied wagtail, little owl, black redstart, wren, herring gull and lesser black-backed gull.

The data provided will include: records of all bat species within a 2km radius, and records of all roof-nesting birds within a 150m radius of the grid reference; plus a list of all Special Areas of Conservation (SACs) and Sites of Special Scientific Interest (SSSIs) designated for bat species within a 10km radius of the grid reference.