What do I actually have to do about smoke and carbon monoxide detectors before my Hanahan closing?

South Carolina requires working smoke detectors in specific locations throughout a home before a residential sale closes, and carbon monoxide detectors are required where fuel-burning appliances or an attached garage make them applicable. A Hanahan seller should test every detector and replace batteries or units that don't respond well before the final walkthrough. Brian Beatty confirms this requirement is met with Hanahan sellers ahead of closing so it never becomes a last-minute holdup.