Swapping a deadbolt is a 30-minute job with one screwdriver. Here's how to measure, choose, and install a new door lock yourself.
You just got the keys to a new place, or a house sitter never gave theirs back, or the front door lock has started sticking so badly you have to lean on it to get the bolt to turn. Whatever brought it up, replacing a deadbolt has a way of sitting on the to-do list far longer than it should — it feels like a locksmith job. If that's where you are, you're in good company; it's one of the most commonly postponed security tasks we see in San Diego homes.
The good news: swapping a deadbolt or door lock is genuinely one of the easiest home upgrades there is. Most take about 30 minutes, cost less than a service call, and need exactly one tool. Here's how to do it right.
A lock is the single piece of hardware standing between your family and the outside, and it wears out like anything else. Salt air near the coast corrodes internal pins, dry inland heat and dust gum up the cylinder, and years of turning slowly loosens the whole assembly. A bolt that sticks today is a bolt that fails to throw fully tomorrow — and a deadbolt that isn't fully extended offers almost no protection.
There's also the question of who still has a key. If you've recently moved in, finished a remodel, ended a rental, or parted ways with a dog walker or cleaner, replacing the lock is the only way to know for certain that the old keys are just metal.
Before you buy anything, measure two things on your existing lock. The backset is the distance from the edge of the door to the center of the bolt hole — it's almost always 2 3/8" or 2 3/4". The bore hole is the diameter of the round opening in the door face, standard at 2 1/8". Most replacement deadbolts are adjustable to fit both common backsets, but measuring first saves a return trip.
For the lock itself, look for an ANSI Grade 1 or Grade 2 single-cylinder deadbolt with a bolt that throws at least one inch. Grade 1 is the strongest residential rating. Skip double-cylinder deadbolts (keyed on both sides) on any door you'd use to escape a fire — needing a key to get out from the inside is a serious safety risk, and they're restricted by code in many places.
A Phillips screwdriver, the new deadbolt, a tape measure, a pencil, and a 3-inch wood screw or two. That's really it. A chisel and drill are only needed in the rarer case where the new strike plate doesn't line up with the old mortise in the frame.
Since you already have the screwdriver out, look at the whole entry. Are the hinge screws tight, and is at least one long enough to hit the stud? Does the door seal well against the frame, or is daylight showing at the edges? Is the knob or lever lock as worn as the deadbolt was? Entry hardware tends to age together, and it's far easier to handle it in one pass than three separate weekends.
One more tip: if you're replacing several locks at once, buy them keyed alike or use a rekeyable system so a single key opens the front, back, and garage doors. It's a small decision that makes daily life noticeably simpler.
Replacing a deadbolt is a satisfying half-hour project — right up until the backset doesn't match, the strike plate needs chiseling, or the door has settled just enough that nothing quite lines up. For Livd members, lock swaps and entry-door hardware are exactly the kind of security task your dedicated handyman folds into a scheduled visit, along with a look at the hinges, weather stripping, and strike plates on every exterior door. Same handyman each time, so they already know which door in your house has always been a little stubborn.
Already a Livd member? Add "replace deadbolt" to your task list in the Livd app and we'll take care of it on your next scheduled visit.
Not a Livd member yet? Schedule your free home walkthrough at livdhomes.com — we'll assess what your home needs and build a proactive maintenance plan to keep the little things from becoming big ones.
