All smoke alarms must be either powered by a long-life (minimum 10 years, non-removal and sealed) battery or mains power.
All smoke alarms must be interconnected with each other, this can either be wired or wireless.
A smoke alarm must be installed in every bedroom, living spaces, hallways, and landings within the dwelling. On a multi-level household unit, there must be at least one smoke alarm on each level. If the kitchen is separated from the living spaces and hallways by doors that can be closed, a heat alarm shall be installed. This may include the scullery.