BSI has just published a new standard. 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. Part 6: Code of practice for the design, installation, commissioning and maintenance of fire detection and fire alarm systems in domestic buildings

 The standard is available for in the FIA eShop. Members are offered a discounted price for this standard after logging in to the site.