Smoke alarms save lives — but only when they’re properly installed, maintained, and tested. At O'Brien Electrical Castle Hill, our fully qualified and licensed master electricians specialise in professional smoke alarm installation, maintenance, and testing for both residential and commercial properties. With over 30 years of experience, we ensure every alarm in your home or business is correctly positioned, interconnected if required, and compliant with NSW regulations. Whether you need a new system or routine maintenance, our 24/7 local team provides peace of mind knowing your smoke alarms will always perform when needed most. Call (02) 9894 4843 or request a quote online today.