Pro Handyman Blog

Installing an additional door lock can give you a more secure feeling, depending upon which type of lock you install. A door chain lock is not the type of lock I would say gives me a feeling of security. I do, however, think they are good for keeping two-year-olds inside the house instead of opening any door they can find to roam outside. Door chains are popular for many reasons.

There are two pieces of a chain lock. The chain, which mounts on the door frame, and the stationary piece that mounts on the door. The kit will come with all hardware, but the screws that hold the chain to the door jamb are usually too small. If someone impacts the door, the weakest part will give first. This may be the chain or either one of the mounted parts.

Choose the height that works for you and mark a level line. Install the chain piece to the jamb using long screws that will hopefully reach solid lumber behind the molding. This usually takes 2 screws. Line up the stationary piece and mount it level with the chain so that the larger open hole side is furthest away from the chain piece. This usually takes 4 screws.

These chain locks can be easily defeated using only a rubber band from outside the door. Manufacturers have made sets that prevent this, so depending on your use for this chain lock, you can go cheap or more costly.