Dangers of Double-Key Deadbolt Locks

Problem

When it comes to securing their homes, homeowners often install double-keyed (double-cylinder) deadbolt locks. Double-cylinder deadbolts require a key for entry from both sides, while single-keyed deadbolts only require a key for entry from the outside. Although the cost to install a double-keyed deadbolt is not necessarily higher than that of a single-keyed deadbolt, they are often chosen for their perceived additional security features. However, these locks come with certain risks that homeowners need to be aware of before installing them. It’s important to learn about the potential risks that these locks pose to determine if they are the right choice for you.

Double-cylinder deadbolts are attractive to people seeking added security because an intruder can’t unlock them from the inside if the key is not in the interior key slot. However, these same features that make them more secure can also make them dangerous in emergency situations. For example, if a homeowner is unable to locate the key during a fire or other emergency, they can become trapped inside their home. In NC, double-key deadbolt locks are considered a defect, due to the “special knowledge” required to operate them, making them not safe for points of egress during an emergency, as a fire fighter would attest.

Conclusion

Double-cylinder deadbolts may provide some added security, they come with risks that need to be strongly considered. If you decide on double-cylinder deadbolts for points of egress in your home, it’s important to educate everyone in your home on how to operate the lock in case of an emergency.