For battery-powered smoke detectors, no electrician is typically required. These units are self-contained and don't involve any electrical wiring, making them straightforward for a homeowner or a handyperson to install.
However, if you opt for a mains-powered fire alarm system, the expertise of a qualified electrician is essential. These alarms are hardwired directly into your home's electrical supply, ensuring a constant power source with a battery backup for outages.