The short answer
Buy a smart lock that fits your door, keeps a mechanical backup, connects the way your home already works, and runs on batteries you will actually change.
That sounds obvious, and yet the calls we get about smart locks almost always come back to one of those four things. The lock was bought for its app or its looks, installed on a door whose deadbolt already dragged, paired to a hub the owner did not have, and left running until the battery died at the worst possible moment.
A smart lock is a motorized deadbolt with a radio attached. It is only as good as the door it is on and the habits of the people who use it. If you get the door right and choose sensibly, a smart lock is a genuine improvement: no more hidden keys under the mat, codes for the dog walker that can be switched off, and a clear record of when the door was opened. If you get the door wrong, it is an expensive way to be locked out.
Step one
Check the door, not the box.
A motor cannot fix what your hand already fights.
Before you shop, close your door and turn the deadbolt by hand. It should slide smoothly all the way out with light finger pressure. If you have to push or pull the door to line the bolt up with the hole in the frame, or if the bolt scrapes and drags, a smart lock will struggle. Motors in residential smart locks are small. A bolt that needs a firm wrist to throw will stall the motor, drain the battery and eventually leave the lock half open.
Fix that first. Usually it is a strike plate that has drifted as the house settled, a door sagging on worn hinge screws, or a frame that swells in humid summers and shrinks in dry winters. A few minutes adjusting the strike or tightening hinges with longer screws can make a stiff deadbolt glide. Our lock repair page covers those fixes.
Next, measure. Most smart deadbolts are designed around standard door preparations, but not every door is standard. Check three things. The door thickness, since many locks cover a common range and need an extension kit outside it. The backset, the distance from the door edge to the center of the lock hole, which is usually one of two common sizes. And the bore hole diameter. Older doors, especially in older Wilmington and New Castle homes, sometimes have non standard preparations or mortise locks that a standard smart deadbolt cannot replace without door work.
Finally, look at the door itself. A hollow core interior style door used as an exterior door, a door with glass right beside the lock, or a frame that is split or patched are all problems no lock can solve. Our door frame guide goes into the frame side.
Types
The main kinds of smart lock.
| Type | How it works | Good for |
|---|---|---|
| Retrofit | Replaces only the interior thumb turn of your existing deadbolt. The outside and your keys stay the same. | Renters with permission, people who like their current exterior hardware, and quick upgrades |
| Full replacement deadbolt with keypad | Replaces the whole deadbolt with a motorized one and a keypad outside, usually with a key cylinder too | Most homeowners who want codes as well as app control |
| Keypad only, no smart connection | Electronic keypad deadbolt without an app or wireless link | People who want codes without connecting anything to the internet |
| Fingerprint or face recognition | Adds a biometric reader outside | Households where children or older relatives struggle with codes |
| Smart lever or handleset | Motorized latch in a lever or a full handleset, sometimes with a deadbolt | Doors that need a matching handle and lock |
| Mortise and multipoint smart locks | Electronic versions built for mortise or multipoint doors | Older homes with mortise hardware and some modern composite doors |
Connection
How the lock talks to you.
Pick what fits the home you already have.
Smart locks connect in several different ways, and the right one depends on what you already use and what you want the lock to do.
Bluetooth. Talks directly to your phone when you are nearby. Simple, and easy on batteries, but on its own it does not let you check or unlock the door from work. Many Bluetooth locks offer an optional bridge that plugs into an outlet near the door to add remote access.
Wi-Fi. Connects to your home network directly, so you can lock, unlock and check the door from anywhere without a hub. The trade off is battery life, since Wi-Fi radios use more power, and reliance on a good Wi-Fi signal at the door. A front door at the far end of the house from the router may need a mesh node or extender.
Z-Wave and Zigbee. Low power radio standards used by many home automation hubs and security systems. They are efficient and reliable where you already have a compatible hub, and useless without one.
Thread and Matter. Newer standards designed so devices from different makers work together more easily. Support is growing but still uneven, so check that your phone, hub or speaker ecosystem supports the specific lock before buying.
If you do not want the lock connected to anything, that is a perfectly sound choice. A standalone keypad deadbolt gives you codes and no keys to hide, with nothing to hack remotely and nothing to update.
Power
Batteries, and what happens when they die.
Almost every residential smart lock runs on batteries. How long they last depends on the lock, the radio, how often the door is used, how stiff the bolt is, and the temperature. What matters more than the stated battery life is what happens when they run low.
- Low battery warnings. Look for a lock that warns you clearly and early, through the app, a light on the keypad, or a beep, while there is still plenty of power to work.
- An emergency power option. Many keypads have terminals or a port on the outside so you can power the lock briefly from a battery or a cable if the batteries die with you outside.
- A mechanical key cylinder. The simplest backup of all. If the electronics fail completely, a key still opens the door. Keep that key somewhere you can reach from outside, such as with a trusted neighbor, not inside the house.
- Cold weather. Alkaline batteries lose capacity in cold weather. On an exposed Delaware door in January, a lock that was fine in October may suddenly warn of low power. Change batteries before winter.
- The right batteries. Use the type the maker specifies. Some locks misread rechargeable cells, which run at slightly lower voltage, and report low battery constantly.
Security
Is a smart lock as secure as a regular deadbolt?
Smart locks raise reasonable security questions, and the honest answer is that it depends on which layer you look at.
The bolt and the frame. This is where most forced entries happen, and a smart lock is no stronger or weaker here than any other deadbolt of the same build quality. Look for a solid bolt with a full throw, and pair it with a reinforced strike and long screws into the framing. That matters more than anything on the app.
The key cylinder. Many smart locks include a basic key cylinder as a backup. Some of those cylinders are no better than the cheapest builder grade locks. If the backup cylinder is the weak link, the smart features do not help. Check reviews and product details for the quality of the cylinder, and consider models where it can be upgraded or rekeyed to match your other locks.
The electronics. Reputable brands encrypt communication and issue firmware updates. Keep the app and firmware current, use a strong account password with two factor sign in where offered, and delete codes you no longer need. Standalone keypad locks avoid the remote side entirely.
Look for locks tested to recognized industry standards for residential hardware. Grade ratings give a useful indication of mechanical durability and strength, though they are not the whole story.
Features
Features worth paying for, and ones that are not.
Worth it for most homes:
- Individual user codes. A separate code for each person means you can remove one person's access without changing everyone's.
- Scheduled or temporary codes. A code for the cleaner that only works on Tuesdays, or a guest code that expires on Sunday.
- Auto lock after a set time. Useful for households that forget to lock the door. Make sure it cannot lock with the door open, or pair it with a door sensor.
- Activity log. A record of which code or phone opened the door and when.
- Door position sensing. Knowing whether the door is actually closed, not only whether the bolt is thrown.
Nice but optional: voice assistant control, geofencing auto unlock as you arrive, and camera integration. Some people love them. Others switch them off within a month. Auto unlock in particular should be set up carefully, since a phone that thinks you have arrived when you are only driving past can open the door when nobody is home.
Weather
Delaware doors and electronics.
An exterior keypad lives through humid summers, driving rain, the occasional nor'easter and winter nights well below freezing. Weather sealing matters more on some doors than others.
A front door under a deep porch roof is sheltered. A side door facing into the wind off open farmland in Kent County, or a door near the water in Delaware City or along the river, takes far more punishment. For exposed doors, look for a weather rating from the manufacturer, and consider a model with a physical keypad rather than a touchscreen, since touchscreens can misread wet or icy fingers.
Temperature also affects doors themselves. Wood doors and frames swell in summer and shrink in winter, which shifts how the bolt meets the strike. A deadbolt that is smooth in October may drag in July. Smart locks feel that change sooner than people do, so a lock that starts struggling seasonally is usually telling you the strike needs a small adjustment.
Installation
Doing it yourself, or having it installed.
Many smart locks are designed for owner installation, and on a standard door with a smooth deadbolt, a handy homeowner can fit one with a screwdriver. The instructions are usually good. Where people run into trouble is the door itself: a strike that needs moving, a bore that is out of line, a door thicker or thinner than the kit allows, or a mortise lock that cannot take a standard deadbolt.
A professional install makes sense if the door needs any adjustment, if you are replacing a mortise lock, if you want the backup cylinder keyed to match your other locks, or if you simply want it done once and done right. When we install a smart lock, we set up the bolt so it throws with minimal effort, reinforce the strike, key the cylinder to your existing key where possible, and walk you through codes and settings before we leave. Our smart lock installation page has more detail.
If you are torn between a keypad deadbolt without any app and a full smart lock, our keypad lock installation page explains the simpler option.
Before you buy
A checklist to take to the store.
| Question | Why it matters |
|---|---|
| Does my deadbolt turn smoothly by hand? | If not, fix the door first or the motor will struggle |
| What are my door thickness, backset and bore size? | The lock must fit without improvised drilling |
| What do I already use at home? | Choose Wi-Fi, Bluetooth, Z-Wave, Zigbee or Thread to match |
| Is there a mechanical key backup? | Electronics fail, and batteries die |
| How good is the backup cylinder? | A weak cylinder undoes the rest of the lock |
| How are low batteries handled? | Clear early warnings and emergency power prevent lockouts |
| Is it rated for my door's exposure? | Exposed doors need better weather sealing |
| Do I need individual and scheduled codes? | Most households do, eventually |
The mistake that causes the most lockouts
Installing a smart lock and then losing track of the backup key. Many owners stop carrying keys once they have codes, which is the point. Then the batteries die or the keypad fails, and the only key is inside the house. Decide where the backup key lives on installation day, somewhere reachable from outside.
Delaware specifics
What we see across both counties.
Older homes in Wilmington, Elsmere and New Castle. Mortise locks, thick doors and unusual preparations are common. Standard smart deadbolts often do not fit without door work. Smart mortise options or retrofit models that work with existing hardware are worth looking at first.
Newer developments in Middletown, Townsend and Smyrna. Standard doors with standard preparations. Most full replacement smart deadbolts fit well. The main work is usually the strike, since builder strikes are often light and fastened with short screws.
Rentals around Newark and Dover. Landlords increasingly fit keypad locks to simplify turnovers. The key question is code management and battery changes between tenants. Our landlord turnover guide covers that.
Rural Kent County. Longer power cuts and weaker Wi-Fi at the door make standalone keypad locks or Bluetooth models with a mechanical backup a sensible choice.
The short version, if you read nothing else
Fix the door so the deadbolt is smooth, measure before you buy, choose a connection that fits your home, keep a mechanical backup and a reachable spare key, and change batteries before winter.
Related
The neighbouring decisions.
If you are weighing electronic entry more broadly, keyless entry pros and cons helps. If your deadbolt is the question rather than the electronics, see choosing a deadbolt grade.
Where we do this
Smart lock installs across both counties.
Questions
About buying a smart lock.
Will a smart lock fit my door?
Most fit standard doors with standard deadbolt preparations. Measure the door thickness, backset and bore hole before buying, and check that your current deadbolt turns smoothly. Older doors with mortise locks often need a different type of smart lock or some door work.
What happens if the batteries die?
A good smart lock warns you well in advance. If the batteries die anyway, most have a mechanical key backup, and many keypads have emergency power terminals on the outside. Keep the backup key somewhere you can reach from outside.
Do I need a hub?
It depends on the lock. Wi-Fi locks connect directly. Bluetooth locks work nearby without a hub and may offer a plug in bridge for remote access. Z-Wave and Zigbee locks need a compatible hub or security system.
Are smart locks easy to hack?
Reputable locks use encryption and receive updates. Most break ins still happen through doors, frames and windows rather than electronics. Keep firmware current, use a strong account password, and choose a lock with a solid bolt and a decent backup cylinder.
Can I keep my existing keys?
With a retrofit lock, yes, the outside of your deadbolt stays the same. With a full replacement, the backup cylinder can often be rekeyed to match your existing key.
Is a keypad lock without an app a good option?
For many homes, yes. You get codes and no hidden keys, with nothing connected to the internet. You lose remote access and activity logs.
Will cold weather affect my smart lock?
Cold reduces battery capacity, and seasonal door movement can make the bolt drag. Change batteries before winter and have the strike adjusted if the lock starts struggling.
Can I install it myself?
On a standard door with a smooth deadbolt, often yes. If the door needs adjustment, the lock is a mortise type, or you want the backup cylinder keyed to your other locks, a professional install saves trouble.