What are the smoke and carbon monoxide detector requirements before a Johns Island closing?

South Carolina requires working smoke detectors placed in specific locations throughout a home before a residential sale closes, and carbon monoxide detectors are required wherever fuel-burning appliances or an attached garage make them applicable. A Johns Island seller should test every unit and replace anything unresponsive well before the final walkthrough catches it. Brian Beatty confirms this requirement is met with Johns Island sellers ahead of closing so it never becomes a last-minute holdup.