How Do I Judge Whether My Locks Are Good Enough?

Neighbors Ask

The short answer, over the fence

A lock is good enough when it does four things well: it turns smoothly, it holds the door firmly shut, it sits in a sturdy door and frame, and nobody you did not choose can still open it. That last part surprises people. A very solid lock stops being good enough the day a former roommate, contractor or previous owner still has a working key.

So judging your locks is really judging a small system. The cylinder, the bolt, the strike plate, the screws, the door itself and the list of people holding keys all count. A weak link in any one of them sets the strength of the whole door.

You do not need tools or training to do a first pass. You need ten minutes, a flashlight and a willingness to look at your own doors the way a stranger might. The rest of this page walks through what to look at and what the answers mean.

Start with the door, not the lock

It is tempting to stare at the shiny lock, but the door matters just as much. Knock on it. A solid wood, fiberglass or metal door sounds and feels dense. A hollow door sounds like a drum. A hollow interior door is fine for a bedroom, yet an exterior door that rattles when you shut it deserves a harder look.

Check the edge of the door where the bolt goes through. If the wood around the lock has splits, soft spots or old repairs, the sturdiest lock in the world has little to hold on to. Likewise, look at the gaps around the door. A gap wide enough to see daylight along the latch side usually means the door has shifted, and a shifted door makes a lock work harder than it should. Our page on doors that sag and what that does to locks goes deeper on that.

Finally, think about the material. Metal, solid wood and fiberglass doors each hold hardware differently, and a good match matters. If you are curious how each one behaves, the guide on metal, wood or fiberglass doors and how locks fit them explains it in everyday terms.

The strike plate and frame, where doors really fail

Ask a locksmith where doors give way and you will often hear about the frame rather than the lock. The strike plate is the small metal plate on the frame that receives the bolt. If it is held on with short screws that only bite into thin trim, a hard shove can split the wood and pop the door open even though the lock itself never failed.

You can check this with a flashlight and a screwdriver. Open the door and look at the plate. See how many screws hold it and how long they look. Longer screws that reach into the solid framing behind the trim make a real difference. Notice, too, whether the opening in the plate lines up with the bolt. If you have to lift or lean on the door to make the bolt slide in, the alignment is off.

There is more on what separates a sturdy plate from a flimsy one in our guide to what makes a good strike plate. A short visit from a professional to reinforce a frame is often the most sensible upgrade a household can make.

Picture a household where the front door has a handsome deadbolt, yet the strike plate was installed with two short screws years ago and the trim has since dried and cracked. Nothing looks wrong from the street. The first real test would expose it. That is why we like to spend more time on the frame than on the lock itself when a neighbor asks us where to put their money.

The smooth turn test

Lock the door and unlock it slowly, several times, with the door open and then again with it closed. A good lock turns with an even, light feel and the bolt slides all the way out and all the way back with a clear stop at each end. If the key grinds, sticks or needs a wiggle, that is information.

Stiffness has several possible causes. Sometimes it is dust or old grit in the cylinder. Sometimes the key itself is worn, particularly a copy of a copy. Sometimes the bolt is rubbing in a misaligned strike. The guide on why a lock turns so hard sorts those causes out, and the page on telling if your locks are worn out covers the signs of age.

Two things to avoid: pushing harder on a stiff key, which can snap it in the cylinder, and spraying whatever oil is in the garage into the lock. The wrong lubricant gums up the small pins inside, a subject we cover in the guide on what lubricant belongs in a lock.

One more clue is sound. A healthy lock gives a clean, solid clunk when the bolt throws and a gentle click when the latch catches. A lock that rattles, scrapes or feels loose in the door is telling you that its mounting screws have loosened or that something inside has begun to wear. Tightening visible screws is a fair first step, but if the looseness returns, let someone look at it properly.

Count the doors and the deadbolts

Walk around the outside of your home and list every door that leads in: front, back, side, the one from the garage, the sliding door onto the deck. Each of those is an entrance, and a stranger looks at all of them, not only the front.

For each, ask whether there is a deadbolt, a separate bolt that locks with a key or a thumb turn and extends into the frame. A simple spring latch in a knob keeps a door closed, but it is not meant to resist much force. A deadbolt is what gives an exterior door real holding power. Whether every exterior door needs one is a fair question, and we answer it in should every exterior door have a deadbolt.

Do not forget the odd ones. The door between a garage and the house is often an afterthought, and so are sliding doors. Our pages on what to do if the lock on a garage entry door fails and sliding door security questions cover the usual trouble spots.

What the grade on the package means

Hardware stores sell locks with a grade printed on the box, and it is a useful clue. In general terms, the grade describes how much use and abuse a lock is built to take, with the strongest category made for heavy commercial traffic and the lightest for ordinary light duty. A higher grade usually means heavier internal parts, thicker metal and tighter tolerances.

A grade is not a promise of safety, though. A very sturdy lock on a weak door and frame is still a weak door. And a mid range lock installed well, with long screws and a reinforced strike, can outperform an expensive one installed carelessly. We unpack this in what lock grade means and in whether expensive locks make a difference.

When you check your own locks, look at the back of the lock or the original paperwork if you still have it. The grade or a model number may be there, and a professional can usually tell a lot from a few photographs and a look at the hardware in person.

Remember that good enough also depends on what you are protecting and who lives with you. A household with young children, an older relative living alone, a home office or a vacation cabin each has a slightly different answer. A lock that is perfectly adequate for a quiet street may call for something sturdier on a rural lane, and a lock with a thumb turn inside may matter more to a family than a lock that needs a key from both sides.

Who still holds a key

Here is the part a flashlight cannot show you. Think about everyone who has ever held a key to this door: previous owners, past tenants, a dog walker, a neighbor who watered plants, a contractor, an ex partner, a relative who moved away. Do you know that every one of those keys is accounted for?

If the answer is no, the lock may be perfectly strong and still not good enough, because the question is who can open it. Changing the pins inside the cylinder so old keys stop working is called rekeying, and it is usually much less involved than replacing hardware. Our page on rekeying your home explains how it works, and the guide on whether to rekey after buying a house is a good companion read.

A related habit is knowing how many keys exist. We talk through that in how many keys a household should keep. A short, known list of keys is a quiet kind of security.

Weather, age and wear in this part of California

Locks live outdoors more than we admit. In the Redding valley the long hot, dry summers bake hardware and fade finishes, and in the mountain towns around Mount Shasta, McCloud and Dunsmuir, cold nights and snow bring moisture, freezing and thaw into the same cylinders. Lakehead and the communities along Interstate 5 and Highway 299 each have their own mix of sun, dust and damp.

Heat can swell wood doors and make a lock bind in August. Cold can stiffen a lubricant and make a latch sluggish in January. None of this means your lock is bad. It does mean that a lock that felt fine in spring may need a little attention by the end of a hard season. Our guide on whether weather and seasons affect locks goes into detail.

A good habit is to repeat your ten minute check twice a year, perhaps when you change the clocks. It costs nothing, and it turns small problems into small fixes.

A final point on judgment: keep records. A small note on your phone listing each door, the type of lock, the date of your last check and the number of keys cut makes the next check easier and makes conversations with a locksmith far easier. You will not have to guess what is on a given door, and neither will they.

Dust deserves a mention too. The valley summers and the dry ridge winds carry fine grit that finds its way into keyways, and a lock that sees a lot of daily use will collect it more readily than one on a seldom used side door. A gentle cleaning with the correct product, rather than a heavy hand with the nearest oil can, keeps most cylinders happy for a long stretch. If cleaning does not help, the wear is probably mechanical and worth an expert opinion. Pay attention as well to the little things that change with the seasons, such as a door that sticks after rain or a latch that feels loose after a hot spell. These tend to come and go, but if they linger past the weather that caused them, the door or the hardware may have shifted for good, and it is wiser to adjust it now than to wait for a morning when it refuses to open at all.

Signs it is time for a professional

Some things you can judge yourself, and some deserve a second pair of eyes. Call in a professional if the key turns but the bolt does not move, if a key broke off in the lock, if the door will not latch without lifting or pushing, if you can see cracked wood around the bolt, or if a lock has been tampered with or forced.

A mobile locksmith can examine a lock on site, tell you whether it needs adjusting, rekeying or replacing, and explain the choices without pressure. Repairs are often modest. Our pages on lock repair and adjustment and new lock installation describe what each involves, and if you want to schedule a visit, the request form is the place to start.

It also helps to know what to have ready before you reach out. The guide on what to have ready when you call a locksmith is short and practical.

A simple checklist to keep on the fridge

Here is the whole exercise boiled down, so you can run through it in one pass. Take your time and treat any no as something to look into rather than something to panic about.

Doing this once gives you a baseline. Doing it every six months tells you what is changing. If you rent, share the results with your landlord in writing rather than fixing things yourself, since rules about changing locks vary by lease and by situation.

• Each exterior door has a lock that turns smoothly and a bolt that extends fully.
• The strike plate is firmly screwed into solid framing and lines up with the bolt.
• The door closes without lifting, pushing or slamming.
• You know who holds every key, and old keys have been dealt with.
• Sliding doors and garage entry doors are as secure as the front door.

Good to know

Common questions