A solid deadbolt is one of the most effective low-cost upgrades to any exterior door, and a locksmith can add one or replace a weak existing bolt.
A single-cylinder deadbolt uses a key outside and a thumbturn inside. Double-cylinder bolts need a key on both sides, which can slow escape in a fire, so they are best avoided on primary exit doors and where local code restricts them.
A quality deadbolt with a full one-inch throw plus a reinforced strike plate and longer screws into the framing resists kick-ins far better than the builder-grade hardware many homes ship with.
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