Two significant British Standards for fire alarm installation are:
BS 5839-1:2017 - Fire detection and fire alarm systems for buildings: Code of practice for design, installation, commissioning, and maintenance of systems in non-domestic premises.
BS 5839-6:2019+A1:2020 - Fire detection and fire alarm systems for buildings: Code of practice for the design, installation, commissioning, and maintenance of fire detection and fire alarm systems in domestic premises.