Deadbolt Installation in Upper Darby, PA

A front door in Upper Darby with only a knob lock relies on a latch to keep it closed.

That latch retracts when you turn the handle. We install a deadbolt as a separate lock, with a bolt that extends into the door frame rather than stopping short. The strike must line up with the bolt so it can travel its full length when you lock the door. A door that closes easily still needs that alignment for the lock to work as intended.

For an Upper Darby entry door with glass nearby, the choice between a single cylinder and a double cylinder matters. The single version locks from outside with a key and turns from inside with a thumb turn. The double version takes a key on both sides, removing the inside turn that someone could reach through broken glass. The trade off is that you also need the key to get out. If you want your existing keys to work with the new lock, we can check compatibility with your other locks.

On a door leading to a garage or basement, we look at its thickness, existing openings and the space where the new hardware will meet the frame.

A door secured only by a knob lock may have room for a separate deadbolt, but its position needs to leave the knob usable. We explain the proposed placement and any changes to the openings before starting, so you know what will be installed and where it will sit.

You can choose a single cylinder, operated by an outside key and an inside thumb turn, or a double cylinder, which needs a key on both sides. Near glass, the double cylinder keeps the inside control from being turned by someone reaching through a damaged pane, but you will need a key to leave through that door. If you want one key for your other locks, we check whether the hardware is compatible. After installation, we check the strike placement with you and operate the lock with the door closed, making sure the bolt extends fully into the frame.

With a deadbolt added to an entry that previously relied on a knob lock, use both locks when securing your home.

Close the door fully before turning the thumbturn or key, and do not force either if it feels stiff. Test the action with the door open. If it moves freely there but binds when closed, the bolt may be catching at the strike.

Keep the keyway clear of grit, and follow the manufacturer's directions for any lubricant. Avoid adding oil or grease, which can hold dust inside the mechanism. If the bolt stops short, the key turns with unusual resistance, or the hardware loosens, contact us to check the fit and operation. A change in how the latch lines up with the frame is also worth mentioning.