Turn a preliminary roost assessment into a survey plan, then find the licence route for a confirmed roost. For other protected species, see which licence you need, who issues it, the fee and how long it takes.
This is a free planning aid, not legal advice. Licensing bodies change forms, fees and timescales, so always check the linked official page before you apply. Survey effort follows the BCT Good Practice Guidelines (4th edition), which say ecologists should adjust effort using professional judgement and justify it in the report.