Single-Cylinder vs. Double-Cylinder Deadbolt Installation: Choosing the Right Fit
The most common upgrade we perform across Riverview is moving a door from a basic knob lock to a proper deadbolt — but the conversation doesn't stop there. A single-cylinder deadbolt uses a key on the exterior and a thumb-turn on the interior, making it the practical choice for most solid-core interior and exterior doors where no glass panels sit within arm's reach of the thumb-turn. A double-cylinder deadbolt requires a key on both sides, which matters on doors with sidelights, decorative glass inserts, or narrow garage-entry doors where a burglar could otherwise break the glass and reach through to the interior turn. Our technicians walk you through exactly which configuration fits your door's layout before any drilling begins.
We handle the full scope of deadbolt installation work: cutting a fresh bore hole in doors that have never had a deadbolt, enlarging an existing bore to fit a larger-format cylinder, installing reinforced strike plates with three-inch screws into the door frame stud (a detail that dramatically increases kick resistance), and re-keying the new lock to match existing keys if you want a single key to operate every entry point. For doors with a mortise lock pocket already routed — common in older Florida homes and most commercial storefronts — we supply and fit mortise lock cylinders and cases that drop into the existing pocket without damaging the door's integrity.
