Patio door locks are the locks on sliding and hinged glass doors that keep the door shut against anyone outside while opening from inside in one motion. The call we hear most: the latch clicks but the door still slides. King Locksmith repairs and replaces patio door locks across Maryland, Washington DC and Northern Virginia for 25 years.
Locksmiths call the sliding version a hook bolt mortise lock: a slim body set into the door edge whose curved hook swings into a keeper, the metal pocket on the frame, so the panel cannot slide or lift. Inside sit the thumbturn, the cylinder the key enters, and the cam that swings the hook. Most bodies mount on two face screws 3-15/16 inches apart, keyway at 45 or 90 degrees.
Hinged doors in MD homes run a multipoint lock, one handle driving two or three bolts along the edge, or a deadbolt on a 2-3/8 or 2-3/4 inch backset, the edge-to-cylinder distance. Fit means hook throw, keeper and face spacing.
Your door stays shut when a child leans on it or wind pushes it, because the hook wraps around the keeper instead of resting against it. A keyed patio lock adds what the factory latch never had: you decide who carries a key.
A lock matching your door’s face spacing drops into the existing cutout, so a worn latch becomes a new one in one visit. Multipoint locks pull a tall French door tight at three points, stopping the warp that lets pry bars in.
We install and repair these locks on sliders off kitchens and decks, on townhome French doors, on condominium balcony doors and on the glass rear doors of restaurants and clinics across Northern Virginia.
A patio lock is the wrong tool for a door that must lock from outside with no inside release, and a hook bolt on a slider with worn rollers never catches, because the panel must be lifted first. Unsure what your door needs? We survey it free.
We look at your track, rollers, keeper and lock together, tell you which lock your door actually needs, and price the work before touching anything. No obligation.
5 brands stay on our trucks because their patio parts fit the doors we actually see: hooks that catch, cylinders that rekey, handles that last.
Prime-Line makes replacement hook bolt mortise bodies in 45 and 90 degree keyway positions, so we match the lock in your door and fix it.
Ideal Security builds keyed and keyless sliding door locks that mount on the frame face, so a door with a worn edge cutout locks tonight.
Hoppe multipoint locks drive several bolts from one handle on hinged patio doors, and we stock gearboxes, the center mechanism, so stiff French doors work.
Adams Rite MS1850 puts a laminated steel hook bolt in narrow aluminum sliding doors, the commercial kind, and we carry bodies and cylinders for replacement.
The latch clicks but the door still slides: the panel has dropped on worn rollers, so the hook no longer reaches the keeper. The thumbturn spins and nothing happens: the cam that swings the hook has broken or its retaining screw has stripped. The lock has seized: rain and road salt corrode hook and cylinder until neither moves.
On arrival we check keeper alignment, then hook throw, then cylinder and cam, because the door explains most failures. Locked out? We respond 24/7. Call (240) 345-1455 in Maryland or (202) 800-2622 in Washington DC and NOVA.
For a dropped panel we raise the rollers with the adjustment screws in the bottom rail, then reset the keeper so the hook seats. For a spinning thumbturn we swap the mortise body, ten minutes when face spacing matches, and reuse your cylinder. Corroded parts are replaced from truck stock.
We replace when the body is discontinued, the door was pried, or you want a key instead of a latch. We measure face spacing, hook throw and backset so the new lock uses the existing holes, rekey it to your house key where the keyway allows, and test full travel before leaving. Estimates are free.
A patio door that will not lock is the easiest way into your home. Call (240) 345-1455 now or book patio lock service online.
Patio door locks secure kitchen sliders and condominium balconies, but every door has its match. Browse our lock type resources below to see each function, its applications and our services.
Straight answers from King Locksmith Technicans to on patio door locks questions customers ask us most.
(240) 345-1455
The hook no longer reaches the keeper, usually because worn rollers dropped the panel. Across Maryland we adjust both first.
Almost always. We measure screw spacing and hook throw so it uses your holes.
Yes. A keyed mortise body locks from outside and opens in one motion inside, across the District of Columbia.
Decades on a well adjusted door.
