16 Different Types of Exterior Door Locks

A close look at a white armored front door with heavy-duty locks.

In today’s world, it is more important than ever to be safe instead of sorry. One way to protect your home or business, along with yourself and those you love, is exterior door locks.

Millions of homes and businesses are broken into each year throughout the world and to help prevent that from happening to you and your property, you will need door locks that you can depend on but there are many different types to choose from. To learn which locks may be best for your situation to keep you and your property safe, here is a list of different types of exterior door locks that are currently on the market, the features of each one, and the history of each type of lock.

1) Knob Locks

A close look at a white door with a knob lock.

If you have ever locked a door that leads to the outside, then you have used a knob lock. This is the most common type of door lock and it is used by pretty much everyone to lock up their home or business on a daily basis. The main feature of knob locks is that the lock cylinder is inside the knob instead of the door.

Many people use them on exterior doors along with interior ones but they are best used inside as they do not offer as much security as other types of exterior locks. A knob lock on an exterior door can be broken into easily which is the reason they are not the best choice but they work wonderfully to lock up an office door or the door to your bathroom. Here are four different kinds of knob locks that are used for interior and exterior doors and can provide enough security to be used on exterior doors.

Many door knob locks feature a keyed entry lock system that is made of stainless steel or other stronger materials that add more security. Most of these types of locks can be installed easily and quickly. Really the only equipment you need to be able to install a knob lock is a Phillips head screwdriver and many are touted as a great option for exterior doors where keyed entry is required to enter. This is a good option for your apartment, mobile home, house, garage, or business.

Knob locks have been around since the 1800s with the first patent being given to Osborn Dorsey in 1878. He was an African American inventor who came up with the creation of a doorknob with an internal door-latching mechanism. In 1818 in Britain, Jeremiah Chubb, Joseph Bramah, and Robert Barron worked as locksmiths and created the design for a tumbler lock that the modern knob locks of today are based on.

Some of the knob locks available today offer Smartkey security that you can re-program if needed. They also offer Microban protection which keeps the doorknob area up to about 99 percent cleaner than unprotected knobs. Knob locks are also available in a package with a deadbolt lock for added protection for your exterior door.

Recommended Knob Lock

Schlage Georgian Knob Lock
  • Elevate the style of your entire home with keyed entry locks that coordinate with Schlage interior hardware
  • Finish coordinates easily with other home accents like Lighting and Plumbing Fixtures
  • Use a key from the outside or manually rotate the interior turn button to lock and unlock
  • For more than 95 years, Schlage has offered durable door hardware in a range of unique style combinations to express any personality
  • Guaranteed to fit on existing, standard pre-drilled doors

2) Deadbolt Locks

A look at a green door with deadbolt lock.

Deadbolt locks are by far the most popular exterior door lock and they are the most often used locks on exterior doors to residential properties. They are so popular that commercial property owners also use them to ensure security for their businesses or buildings.

Most homeowners choose a deadbolt lock with a single-cylinder which can actually be listed under a subset outdoor light types. There are many types of deadbolts that can be used in some way to secure entry to a house. This type of lock is most often used to secure exterior doors but can also be used inside of your house, although there are better door lock types for use indoors.

The deadbolt lock got its name for the fact that it does not have any spring-loaded mechanisms inside to work the bolt like other locks do so it is referred to as “dead.” The history of deadbolt locks can actually be traced back to the 1800s when banks begin using locks that required keys to protect their safes.

Back in those days, bank robbers viewed safes inside a bank as easy money to steal so the deadbolt was created to make it harder for the lock to be smashed and for the robbers to gain access to the money inside. Deadbolt locks are sometimes referred to as jimmy proof locks and those were first created by Samuel Segal, who once worked as a New York City police officer, in 1916.

He holds over 25 patents including several for different types of locks. Jimmy proof deadbolt locks are even more secure and are used often in large apartment buildings or other larger buildings for the added security they bring to the property owners.

Recommended Deadbolt Lock

Kwikset 660 Single Cylinder Deadbolt Lock
  • Keyed entry deadbolt with a traditional colonial design for an exterior door; easy installation in just minutes with a screwdriver
  • For use on exterior doors where a deadbolt on one side and keyed entry and security is needed
  • Features SmartKey Security Re-key your lock in 3 easy steps; Compatible with Kwikset KW1 Keyway
  • Features adjustable latch to fit all standard door preparations; Exposed screws on the interior face
  • Side locking bar technology offers improved security by protecting against lock bumping, an attack technique used to defeat conventional pin & tumbler locks

3) Cylindrical Lever Locks

Types of Door Locks - Cylindrical Lever Locks

Cylindrical lever locks are very similar to deadbolts in the way that they operate and are also used in both commercial and residential properties to secure exterior doors. There seems to be more space on larger doors for this type of lock which is the reason they are used for securing exterior doors at businesses, factories, and large buildings. Cylindrical lever locks are easier to operate than deadbolts because the lock lends itself to easier flexibility when moving in and out of the doorway jam.

This type of lock is not as secure as a deadbolt lock so it is used less often to secure the doors of people’s homes. The lever itself can be manipulated easier, hence giving a person who is up to no good a better chance of gaining entry to the property.

Recommended Cylindrical Lever Lock

LYNN HARDWARE Heavy Duty Designer Commercial Lever Door Lock
  • FUNCTION: Entrance/Keylock Function (Turn/push-button locking: push-button locks the outside lever until it is unlocked by key or by turning the inside lever) (pushing and turning button locks outside lever, requiring use of a key until the button is manually unlocked
  • COLOR & SIZING - Satin Chrome/Aluminum finish (26D finish) - Fits 1-1/2" to 2" thick Doors and comes standard with 2-3/4" backset - NON HANDED: Perfect for either Right Hand or Left Hand doors.
  • STRIKE & FACEPLATE: Comes with standard ANSI 4-7/8" x 1-1/4" square corner strike and 1-1/8" x 2-1/4" square coner faceplate
  • CERTIFICATION: ANSI/BHMA 156.4 Grade 2 Certified and UL Listed. ADA Compliant. Fire Rated for up to 3 hours
  • COMPARABLE: AL53PD, Sargent 7U05, Sargent 7G05, Lawrence LH5304, Inox BL-53-07

4) Single-Cylinder Locks

This is a close look at an exterior door with a single-cylinder lock.

Single-cylinder locks have a space for a key on one side only. The other side has a twist knob that locks the door from the other side. The key side is on the external part of the door, while the internal part has the knob so that you can lock your door from the inside without a key. Single-cylinder locks can be deadbolt locks as well.

Recommended Single-Cylinder Lock

Berlin Modisch Contemporary Square Single Cylinder Deadbolt Lock
  • Designed to complement modern contemporary style interior and exterior doors for commercial and residential applications deadbolt
  • Heavy duty high grade security door deadbolts for use on exterior doors where a deadbolt single cylinder keyed entry on the outside and thumb turn latch on the inside for security is needed
  • Uniquely crafted square shaped Deadbolt Set With 2 3/8 inch - 2 3/4 inch adjustable backset latch Features adjustable latch to fit all standard door preparations and comes with a square corner striker
  • Comes with unique thumb-turn interior lock latch knob that that is opened by an exterior key KW1 keyway for office or front doors, Fully reversible for both right and left handed doors with a brushed iron black color finish
  • Durable & Portable secure keyed entry deadbolt Iron Black Finish Deadbolt which fits 1-3/8-Inch to 1-3/4-Inch doors easy installation in just minutes

5) Double Cylinder Locks

A close look at an exterior door with a double-cylinder lock.

Double cylinder locks do not have a twist knob and require a key on either side. These locks are recommended for places where you don’t want anyone to be able to lock the door from the inside without a key.

Recommended Double-Cylinder Lock

Brinks Double-Cylinder Deadbolt, Keyed on Both Sides
  • Meets ANSI Grade 2 standards for pick, drill and bump resistance
  • Durable metal construction with 1 inch deadbolt and steel anti-saw pin
  • 4-way adjustable latch that fits any 2-3/8" or 2-3/4" backset
  • Easy to install and fits all doors 1 3/8 inch to 1 3/4 inch thick

6) Mortise Locks

A look at a brown door with mortise lock.

Similar to cylindrical lever locks, mortise locksets are also used more often on the exterior doors of businesses and other commercial properties because of the way they are designed. They need more room to operate properly but many homeowners use them to secure their homes too. Many older homes already had mortise locks in place when the homeowner bought the house and the person decided to continue to maintain the mortise locks instead of changing them out for a different type of lock.

People have been using mortise locks since the eighteenth century to secure their exterior doors to their properties in the United States. The earlier versions of the mortise locks featured a pull that allowed the door to be unlocked. The pulls were eventually replaced by doorknobs.

The intricate parts of mortise locksets are installed inside the door and include the lock cylinder and the cam which allows the door to be locked and unlocked. This type of lock is extremely strong which is why many business owners prefer it as compared to other types of locks. Mortise locks are as strong and durable as deadbolt locks and many consider them to be even more reliable than deadbolt locks. They are a great choice when it comes to security.

Recommended Mortise Lock

SUMBIN Commercial Heavy Duty Mortise Lock Handle Set
  • ANSI GRADE 1 AMERICAN MORTISE LOCK CASE Satin Stainless Steel Housing,Lock Case Size:70mm(2 3/4")x92mm(3 5/8") With 1,000,000 Time Life Cycle
  • REVERSIBLE LATCH BOLT 19mm(3/4"),1" SUS304 Extension Deadbolt For Extra Security,Rocker Switch Lock Or Unlocks Hub
  • REVERSIBLE LEVER HANDLE With Die-casting 304 Stainless Steel Material,Lever Size:115mm(4 1/2") Length and 64.5 Width(2 1/2")
  • ENTRY/OFFICE FUNCTION Door Thickness 45mm To 50mm Door Thickness

7) Euro Cylinder Locks

A close look at a Euro Cylinder lock with a set of keys.

Euro cylinder locks are used in Europe more often than in the United States, hence the name of the lock, but that does mean no one in America uses them. You will be able to find some throughout the country being used most often on patio doors or for interior double doors. Although Euro cylinder locks are used on patio exterior doors most of the time, they are not the most secure option to protect your home or business.

The body of this type of lock is more easily damaged and can break down after being used over periods of time. You may know someone that has a patio door that is hard to open or nearly impossible to lock or unlock and this is the reason for the issues. The lock body can even snap, leaving your home completely unprotected.

Even though Euro cylinder locks are not the greatest option when it comes to home security, many homeowners still prefer them because they are very easy to install and to use. They are self-contained locks which makes the installation process much easier than the process is when it comes to other types of locks. But even though it’s easy to install, it may not be the right choice for your exterior doors that are meant to protect you and your family.

Recommended Euro Cylinder Lock

Yale Euro Cylinder Lock
  • Standard security euro cylinder lock approved to British Standard BS EN 1303:2011
  • Replacement euro cylinder that can be installed in a few minutes, no specialist tools required
  • Supplied with 3 Standard Yale keys, additional replacement keys can be ordered from a locksmith
  • Suitable for use with a wide range of doors including wooden, composite, UPVC or aluminium doors with a Euro profile
  • 2 year guarantee.Polybag version comes in a plastic bag with no fitting instructions

8) Electronic Locks and Smart Locks

A close look at a brown door with a Smart Lock installed.

Electronic locks are most often used for residential properties by homeowners and the owners of condos or renters of apartments. Electronic locks are not the same as smart locks, even though people tend to lump them in the same category. Even though smart locks are electronic, not all electronic locks are smart locks.

Obviously, the two are very similar but when it comes to electronic locks, they do not have the capability for easy access that many people enjoy with smart locks. When it comes to both types of locks, though, there can be an issue when the electricity goes out due to a storm or some other issue. Homeowners and business owners should be aware of this issue and purchase an electronic or smart lock that can be backed up to have the ability to unlock it with a key if the need arises.

Most people use smart locks because of the need to have more control over the security of their home or business. The smart lock needs to have an authorized device to be able to lock and unlock it while an electronic one is usually controlled by punching in a code on a keypad.

The smart lock is controlled by wireless communication between an authorized device while the code for an electronic lock is entered manually by the person locking or unlocked the exterior door to leave or gain entry.

Both types of locks function inside the door similar to other locks, including euro cylinder locks, deadbolts, and mortise locksets. Due to their unique features, though, electronic and smart locks are in a category of their own.

Recommended Smart Door Lock

Eufy Security Smart Lock
  • Your Finger is the Key: Smart Lock fingerprint door lock recognizes your fingerprint in just 0.3 seconds and unlocks your door in 1 second—it’s faster than fumbling for your keys.
  • Control From Anywhere: With its all-new Wi-Fi connectivity, you can control Smart Lock from absolutely anywhere via the eufy Security app.
  • Always Has Your Back: Even when you’re in a hurry, Smart Lock is ready to protect your home. A built-in sensor detects when your door is closed and locks it automatically behind you, every single time.
  • Multiple Ways to Unlock: Open Smart Lock using your fingerprint, with your phone via the eufy Security app, or by using the keypad or key.
  • Built to Last: With a sturdy zinc alloy and stainless steel frame, Smart Lock is tested to handle the comings and goings of a busy household for over 30 years. The IP65 rating ensures that come rain or shine, your front door is protected.

9) Fingerprint and Retinal Scan Door Locks

A close look at a glass door with a fingerprint scan door lock.

Convenient to use because they require no key, fingerprint door locks provide a more state-of-the-art type of security because only individuals who have had their fingerprints programmed into the lock can “open” the lock. To open a fingerprint lock, a person must place their forefinger flatly on a sensor that recognizes their fingerprint pattern.

Retinal scan door locks are probably the most advanced type of exterior door lock. Predominantly used to secure buildings harboring manufacturing, medical and governmental secrets, retinal door locks require users to input a biometric scan of their retina into the lock system before gaining entry. Real-time retina scans must match what the system has on file.

Recommended Fingerprint Door Lock

LOCKLY Fingerprint Biometric Smart Deadbolt Door Lock
  • 🔓【Advanced 3D Fingerprint】LOCKLY Smart Lock can recognize your fingerprint in just 0.5 seconds, and unlock your door in 1 second. It's faster than fumbling for your keys. The most secured 5-in-1 Keyless Entry Smart Door Lock: Fingerprint + Passcode + Smartphone + Mechanical Key + Share ekey.
  • 🔓【PEEK-Proof Digital Keypad】Patented PIN Genie technology makes it nearly impossible to guess your personal access code (even if someone is watching) when entering your PIN number by always shuffling number locations on the secure, backlit keypad.
  • 🔓【Real-time Access Logs】Stores all access history so you can review who is coming and going anytime from your mobile phone. Great for keeping track of family members as they arrive home. Grant one-time use or specific time duration access by issuing codes or digital eKeys remotely via your mobile phone. Guests can access using their mobile phone, even without an internet or cellular connection.
  • 🔓【Easy DIY Installation】Replaces existing deadbolt with basic household tools in about 15 minutes. Fits both left and right swinging standard doors, 1 3/8 to 2 inches thick. Requires 2 1/8 inch face bore hole.
  • 🔓【Satisfaction Guaranteed】2-year warranty and free life-time technical support. Any question such as installation or App problems(or for more gateway information) please feel free to contact us.

10) Fail-Secure Electric Strike Locks

Electric locks need an electric current at least 12 volts or higher to work properly. Also referred to as a “fail-secure” device, electric strike locks ensure doors remain locked during power outages. Doors equipped with fail-secure electric strike locks also have doorknobs in case someone needs to open it from the inside of a room.

Recommended Fail-Secure Electric Strike Lock

UHPPOTE Access Control Electric Strike Door Lock
  • ✅The main feature of this kit is that it allows you to open the door simply by pressing the wireless RF remote instead of moving to the door physically when someone visits. The remote communicates with the receiver, which can program up to 40 remotes, and it has a range of 164 feet.
  • ✅An exit button is included in this magnetic lock system kit, and you could exit from indoors easily by pushing it once.
  • ✅The remote communicates with the receiver to let people in
  • ✅0/5/10 seconds locking delay time adjustable, default is 5 seconds
  • ✅The default function of the remote is momentary that when the power is on, the lock is locked and when you press the button on transmitter the lock will unlocked temporarily to open the door. The other function is toggle that the remote has is the ON/OFF feature.

11) Fail-Safe Electric Strike Locks

While fail-secure electric strike locks remain locked during power outages, fail-safe electric strike locks can be unlocked during power disruptions. When integrating this kind of lock in a security system, make sure you have some type of back-up power to avoid compromising the security of a home or business.

12) Magnetic Locks

A close look at a dark brown door with a magnetic lock.

Magnetic locks not constructed of interlocking parts nor do they need keys or combinations to be opened. They work using magnetism powered by a 12 to 24 volt DC current. Magnetic locks are considered fail-safe types of locks because they need a live current to prevent unlocking of doors. When a magnetic lock is installed on the main entrance door, a back-up power supply is advised in case of power disruptions.

13) Keypad Locks

A close look at a glass door with a keypad lock.

Keypad locks rely on an electronic keypad that needs to be manually inputted with a specific linear combination of numbers, letters, or symbols in order to “tell” the lock to open a door. Keypad locks are convenient to use when multiple people consistently enter a building throughout the day. With no keys to worry about, the risk of losing keys and having them frequently replaced is eliminated.

Recommended Keypad Lock

Kwikset Contemporary Electronic Keypad Lock
  • Keyless entry with a motorized driven deadbolt for 1 touch locking, low battery indication, and easy install with just a screwdriver
  • For use on exterior doors where keyed entry and security is needed.Customizable automatic door locking after 10 to 99 seconds for peace of mind
  • 6 customizable user codes along with temporary codes that can be used just once, perfect for visitors and service personnel
  • Single cylinder electronic deadbolt operates by keypad or key outside and thumb turn inside, fits door thickness of 1 to 3/8 inches to 1 to 3/4 inches Alarm sounds after 5 consecutive entries and the keypad is deactivated for 45 seconds
  • Includes an adjustable latch to fit all standard door preparations; Customizable automatic door locking after 10 to 99 seconds for peace of mind

14) Sliding Door Locks

A set of glass doors with sliding door locks.

Burglars consider homes with sliding glass doors as easier targets to rob. Standard sliding glass doors come with factory locks that do not provide the kind of higher security level you need. Homeowners with sliding glass doors should consider replacing factory locks with either two-bolt locks or smart locks designed specifically for these doors. Two-bolt locks strengthen door frames by sliding a steel bolt into frames while smart locks can be remotely activated from outside or inside a building.

15) Padlocks

A close look at a chain link fence locked with a padlock and a set of chains.

Padlocks have been around for years and are probably the most recognized lock by most people. They can be used for a multitude of things, including locking exterior doors, locking a shed, locking up bicycles, to secure a garage door, for added security at homes and businesses, the list is endless. Padlocks have been discovered that were actually used during the Roman Era which was 500 BC to 300 AD, so a really long time ago.

Padlocks are most often used as an auxiliary addition to increasing the security there is already in place, especially when it comes to exterior doors. Many factories and other businesses use padlocks in conjunction with other types of locks for the added security it brings to their business and the valuable items inside. Padlocks have evolved and changed a lot over the past few decades but have still maintained their integrity as some of the most dependable locks on the market.

Recommended Padlock

Abus Titalium Mechanical Shackle Padlock
  • High security padlock
  • Weather resistant padlock
  • Extreme Corrosion Protection
  • Normal arch
  • Security level: 8

16) Remote Control Lock Systems

A close look at a remote control door lock system.

A completely automated security system that allows you to unlock or lock all doors while in the shower, lying in bed or watching TV. You can also check to make sure all doors are locked from one area in a building, eliminating the need to walk through a home or business to check each door. Benefits of “keyless” remote lock systems include:

  • Ability to the preset engagement of door locks at certain times using a smartphone app
  • Connecting floodlight operations to the system so that lights turn on when you unlock a door
  • Makes it easier for people with physical disabilities to lock and unlock doors
  • Reduces home or business security costs by eliminating the need for maintenance of physical locks or replacement of damaged locks

Recommended Remote Control Lock System

Keyless Deadbolt Access Control System with 4 Remote Controls
  • 【High-quality Material】- The remote control door lock with anti-rust battery box, the spring is made of special material, durable in use. The locking tab and main parts are stainless steel, no fading. Beautiful appearance and arc design, the lock body is relatively thin.
  • 【Induction Lock】- Our deadbolt access control system unlocks by remote control, then closes the door, locks 3 seconds later. (no lock, no lock). The remote control distance is 0-10m. The unlock mode includes remote control unlock and key unlock.
  • 【Power Saving Control Mode】- low power consumption, 4 AA batteries can offer about 1 year of work (not include 4 AA batteries). This smart lock has a long service life, 300 thousand lock operations, no wear.
  • 【EASY TO INSTALL】 - Easy and firm installation with the external mounting plate. Remote control with digital conversation system, can not be decoded or duplicated. Innovative release and lock tone. It is easy to install without plugging in.
  • 【Wide Application】- Remote controls with digital conversation system, cannot be decoded or duplicated. Ideal for office, home, hotel, anti-theft door, hall door, wooden doors, garage door, etc.

Grading Scale of Door Locks

The American National Standards Institute (ANSI) uses a scale to grade performance and security abilities of all types of locks. Grade 1 locks are commercial level locks that are strong but more expensive than grade 2 or grade 3 locks. Locksmiths carry grade 1 locks but most hardware stores do not carry grade 1 locks.

Grade 2 locks include most exterior door locks found in home improvement department stores. Their ability of grade 2 locks to secure doors depends on several factors, such as what kind of door they are securing and materials used to make the lock.

Grade 3 locks are not as strong as grade 1 or grade 2 locks and should only be used to secure interior doors. Grade 3 locks are easily “picked” open with a screwdriver or other tool.

Are Expensive Exterior Door Locks Worth the Price?

Cheaper door locks tend to erode more quickly than higher-end locks, especially when they are exposed to seasonal weather changes. Erosion of the cylinder tumbler causes the locking mechanism to malfunction, leading to key break-offs and other problems. In some cases, paying more for a high-quality door lock is recommended when the risk of experiencing an intrusion and/or robbery is high. Professional Locksmiths can help you decide which lock grade or lock type would best accommodate your needs.

Types of Exterior Door Locks – Glossary

Commonly used door lock and locksmithing terms include:


Cylinders consist of parts necessary for most locks to function properly, such as plug retainers, tumblers, plugs, and tailpieces.

Key Codes

Locksmiths can make keys according to a code number imprinted on a lock. Key codes prevent locksmiths from cutting off or replacing locks in most cases.


Keyways are grooves carved along the key blade. Keyways often have corresponding locks or can represent the groove configuration associated with a set of locks. A keyway capable of opening multiple locks is called a master key.

Chip Key

Chip keys incorporate computer chips that correspond to specific locks containing codes placed onto the chip. Transponder keys are a type of chip key.

Lock Rekeying By replacing tumblers comprising lock cylinders with tumblers of various measurements, a locksmith can rekey a lock so that a new key operates the lock. Rekeying locks eliminates the need to purchase and install new locks.


Inside some exterior door locks lies parts that have been precisely arranged to allow a specific keyway to manipulate them and open the lock. Combination locks have tumblers which align when the correct set of numbers are entered.

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