What a smart lock actually is
A smart lock is an ordinary deadbolt or latch with a motor, a small circuit board and a way to receive commands. The commands might come from a keypad on the door, a phone app over Bluetooth or Wi-Fi, a fingerprint reader, a card, or a voice assistant. Inside, the mechanical part still has to throw a bolt into a frame. If the door is misaligned or the frame is weak, an expensive smart lock will be no better than an ordinary one, and may be worse because the motor is not strong enough to force a binding bolt.
Smart locks fall into two broad families. Some replace the whole deadbolt, including the cylinder and the exterior assembly. Others are retrofit units that attach to the inside of an existing deadbolt and turn the thumb turn, leaving the outside key slot and cylinder as they were. Each has trade-offs, and the right choice depends on your door, your existing lock, and how you want to use it. A technician can look at your door and tell you what fits.
Keypad, app, fingerprint and fob compared
A keypad lock lets you enter a PIN on the door. It does not need a phone and is easy for guests, housekeepers and family to use. A phone-controlled lock lets you unlock with an app, often through Bluetooth when you are near the door and through Wi-Fi when you are away. A fingerprint lock reads a finger and is quick for family members but needs clean, dry fingers and occasional re-registration. A fob or card lock is useful for small offices and rentals where each person gets a card.
Many locks combine methods, with a keypad for guests and an app for the owner. Think about who uses the door. A household with young children and older relatives may prefer a keypad over an app. A short-term rental needs temporary PINs. A home with a regular cleaner needs a PIN that can be changed or removed. Think about your habits before you buy, because the best lock is the one every user finds easy and reliable.
| Type | Strength | Watch for |
|---|---|---|
| Keypad | No phone needed, guest friendly | PIN sharing and worn keys |
| Phone app | Remote control and logs | Phone loss and app updates |
| Fingerprint | Fast for family | Wet or dirty fingers |
| Card or fob | Good for offices and rentals | Lost cards |
| Retrofit unit | Keeps existing key and cylinder | Door alignment and battery use |
Checking that your door is compatible
Before any smart lock goes on, the door needs to be measured and checked. Door thickness, backset, bore size and the position of the edge hole must match what the lock requires. Most residential doors follow standard sizes, but older doors, custom doors and impact doors can differ. If your door has a deadbolt already, the technician checks whether the new lock can use the same holes. If not, the holes may need to be modified, and not all doors can be modified.
The frame and strike matter as well. A smart lock motor has limited power, and it can stall if the bolt rubs against the strike. A door that sticks in the wet season is a poor candidate until it is adjusted. If the door has glass nearby, check how the thumb turn can be reached. Check also whether the door is a fire door or an exit door in a multi-family building, because rules may restrict the hardware that can be used.
- Door thickness and backset measured before ordering.
- Existing bore and edge hole checked against the new lock.
- Bolt and strike alignment tested and adjusted.
- Wi-Fi or Bluetooth range checked at the door itself.
- Building or association rules checked for exterior hardware.
Batteries and what happens when they run out
Smart locks are battery powered, usually with four AA batteries or a rechargeable pack. Most warn you when power is getting low, through a beep, a light on the keypad, or an app alert. Heed the warning. A lock that has run out of power will not turn, and a lockout caused by a dead smart lock is one of the most common calls we hear. Most designs include an emergency way in, such as a physical key slot hidden under a cover, or terminals on the outside that let you touch a battery to power the keypad for a moment.
Make a habit of changing batteries on a schedule that suits you, such as when you change smoke detector batteries, and use good quality alkaline or the type the maker specifies. Heat shortens battery life, and a door in direct afternoon sun may drain faster. Keep a spare set where you can reach it. A smart lock that shows low battery and is ignored is a lockout waiting to happen, and it is also a lock that may behave strangely as voltage drops.
Humidity, salt air and storms
Electronics and moisture do not get along, and South Florida has plenty of both. Choose a smart lock rated for outdoor exposure, and make sure the technician installs it with the gaskets and seals the maker provides. Salt air corrodes exposed contacts, so wipe the keypad face with a damp cloth from time to time and avoid harsh cleaners. If your door faces the ocean or the Intracoastal, a lock with a sealed keypad and corrosion-resistant finish is worth the thought.
Storms and power cuts raise another point. A smart lock that runs on batteries keeps working when the power goes out, but if it depends on Wi-Fi for app control, a router outage means the app stops working, and only the keypad or key will open the door. After a big storm, check that the lock still operates and that the app reconnects. Our page on hurricane season lock preparation lists other items to check before and after a storm.
Why a backup key still matters
Every smart lock should have a mechanical way in that does not depend on electronics. If the lock includes a key cylinder, keep a key somewhere other than inside the house, such as with a trusted neighbor or in a secure lockbox. If the lock is keyless, learn where the emergency battery contacts are and how to use them. Test the backup before you need it, not for the first time on a stormy night.
A hidden spare key under a mat or in a planter is not a backup. It is an invitation. Anyone who watches you for a day or two can find it. A better solution is a spare with someone you trust, or a purpose-built key safe fixed to a wall with a PIN that you control. See our lockbox and key safe guide for how to choose one and where to put it.
Setup, PINs and account hygiene
Installation is only half the job. Setup includes pairing the lock with your phone, setting an administrator PIN, creating user PINs, and linking the lock to an account or home system if you choose. Choose PINs that are not birthdays, addresses or repeated digits. Give each user their own PIN where the lock allows, so that you can remove one person without affecting the others and so the log shows who came in.
Protect the account that controls the lock. Use a strong, unique password and turn on two-step sign-in if the app offers it. Keep the phone's screen lock enabled. If you sell the home, rent it or change cleaners, remove old users and reset the lock. If you lose your phone, sign in elsewhere and remove the lost device from the lock account quickly. These habits matter more than the model you buy, because a smart lock is only as secure as the account behind it.
- Pair the lock and test it with the door open.
- Set the administrator PIN and keep it private.
- Create separate user PINs for each person who needs access.
- Turn on two-step sign-in for the lock account.
- Record where the backup key and spare batteries are kept.
Rentals, short-term stays and property managers
Smart locks suit rentals because PINs can be changed between guests and access can be given remotely. Create a temporary PIN for each stay, set to expire after checkout, and check the log if something is missing. A property manager who handles several doors can keep access organized in one app. For long-term tenants, discuss who may hold the administrator access and what happens when the tenant leaves.
Landlords should check local rules and lease terms before adding a smart lock. The tenant may need a key as well, and the lock must always allow them in. Keep records of who has access, and change PINs when tenancy changes. For vacation properties, remember that a power or Wi-Fi outage can disrupt remote access, and arrange a local person with a physical key as a fallback. Our page on vacation rental lock solutions covers this in more detail.
Everyday problems and safe first checks
Most smart lock complaints come down to a handful of causes. The lock turns slowly or stops halfway: check the batteries first, then check whether the door has shifted so the bolt rubs the strike. Try the lock with the door open. If it works freely open and struggles closed, the problem is alignment, not electronics. The app cannot find the lock: check that your phone's Bluetooth is on, that you are near the door, and that the lock's own battery is not low.
The keypad does not respond: wipe the face, wait a moment, and try again, since a wet or salty keypad can behave oddly after rain. A wrong PIN several times can put the lock into a short lockout period, so stop and wait instead of pressing faster. If the lock beeps a pattern, check the maker's guide for what it means. Do not take the lock apart yourself, and do not apply oil or spray to electronic parts, because many sprays attract dust or harm seals.
If these checks do not help, a technician can inspect the mounting, the wiring between the exterior and interior halves, the motor and the strike. Our page on smart locks that go offline goes through the typical causes in more detail.
Choosing between smart, keypad and plain key
A smart lock is not automatically the best choice. If you rarely give anyone access, a good deadbolt with a quality key may serve you perfectly well and has fewer parts to fail. If you often lose keys or give access to many people, a keypad or app lock can be a real improvement. If you want to know when someone enters, an app lock with a log fits. If you are unsure, a keypad lock with no app is a middle path with fewer moving parts and no dependence on a phone.
Think about the people who use the door. An older relative who does not use a phone may be happier with a keypad or a key. A teenager who loses things may benefit from a PIN. A household where everyone carries a phone may like the app. Think also about visitors and trades: a plumber or a delivery driver may need access once, and a temporary PIN that expires is neat. Our guide to smart lock, keypad or key compares the options side by side.
- Few users and simple needs: a quality key deadbolt may be enough.
- Many users or frequent guests: keypad or app lock.
- Want an entry log: app lock with user PINs.
- Prefer no phone dependence: keypad with a backup key.
- Rental or short stay: temporary PINs that expire.
Privacy, updates and long-term care
A connected lock talks to your phone and sometimes to the maker's servers. Read what the app collects and what it logs, and decide whether you are comfortable with it. Install app and lock updates when offered, since they fix bugs and security flaws, but do it when you are home and not about to walk out of the door. If you stop using the lock, remove it from your account before you sell or give away the home.
Long-term care is simple. Change batteries on schedule, wipe the keypad, check that screws are tight a couple of times a year, and test the backup key. Watch how the bolt moves, and if it begins to labor, have the door and strike checked. A lock that is cared for lasts longer and fails less often, and a quick check each season catches small problems before they strand you on your own doorstep.
What to expect during the visit
A technician will remove the old lock, check the door and bore, install the new lock, align the strike, and test the mechanism with and without power. They will set up the keypad and help you pair your phone, and will show you the emergency access method. Plan about the time it takes to set up carefully and not to rush, and have your phone, your account passwords and your Wi-Fi details ready.
Pricing is explained by phone. Quotes are given only by phone, and complicated jobs, such as modifying a door or fitting several locks, may need an on-site visit before a final number is possible. There is a service call charge, and it is explained before anyone is dispatched. When you are ready, call and describe your door, your current lock, and the kind of smart lock you have in mind, and the dispatcher will explain what the visit involves.
Questions people ask
Will a smart lock fit my existing door?
Most standard residential doors accept a smart lock, but thickness, backset, bore size and the edge hole must match. A technician measures these before work. Older, custom or impact-rated doors may have limits, and a door that sticks or has a weak frame should be fixed first so the lock motor is not strained.
What happens if the batteries die?
Most smart locks warn you when power is low. If the batteries do run out, most designs have a physical key slot or external battery contacts for emergency entry. Learn where these are and test them early. Change batteries on a regular routine, and keep a spare set somewhere you can reach if you are locked out.
Is a smart lock safe in humid, salty air?
Choose a model rated for outdoor use, with sealed seals and a corrosion-resistant finish, and have it installed with the maker's gaskets. Wipe the keypad with a damp cloth occasionally to remove salt. Even good locks benefit from simple care in a coastal climate, and ocean-facing doors deserve extra attention.
Do I still need a backup key?
Yes. Electronics can fail, and a mechanical or emergency option keeps you from a lockout. Keep a key with someone you trust or in a proper key safe, not under a mat. If your lock has no key slot, learn the emergency power method and test it before you need it.
Can I give guests and cleaners their own PINs?
Most keypad and app locks allow several user PINs, and many allow temporary ones that expire. Give each person their own so you can remove one without disturbing others and so the log shows who entered. Remove old users when a cleaner, tenant or guest no longer needs access, and change the administrator PIN if it was shared.
What if my Wi-Fi or the power goes out?
Battery powered locks keep working during a power cut. If the lock needs Wi-Fi for app control, an internet outage stops remote functions, but the keypad and key still work. After a storm, test the lock and confirm the app reconnects. Keep a physical backup so one failure never leaves you outside.
Describe the situation by phone and we will tell you what the job involves. Quotes are given by phone. Jobs that cannot be quoted without seeing them need a technician on site, and the service call charge is explained on the phone before anyone is dispatched.
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