Not all door locks are created equal. After installing hundreds across Eastern Pennsylvania, I’ve seen knob locks fail under a credit card, and deadbolts stop break-ins cold. Choosing the right one genuinely makes a difference.
Quick Answer: What Are the Main Types of Door Locks?
The most common types of door locks for homes include deadbolts (single and double-cylinder), knob locks, lever handle locks, smart locks, and keypad locks. For strong security, experts recommend a Grade 1 or Grade 2 deadbolt as your primary lock on entry doors, with knob or lever locks as convenient secondary options.
Each type of lock offers different security levels, ease of use, and installation needs. Pick the combination that fits your exterior doors, interior doors, and overall protection goals.
Why Understanding Lock Types Matters for Your Home Security
Not all door locks provide equal protection. A simple knob lock on an exterior door can be bypassed in seconds, leaving your home vulnerable. Many older Pennsylvania homes still rely on outdated door hardware, especially on sliding doors or original entry doors. Choosing the right door lock types—whether a deadbolt, sliding bolt lock, or smart lock—directly impacts your security, daily convenience, and even home value.
Installing a proper deadbolt in a century-old oak door frame can be a workout; the drill bit catches on those tight wood grain rings, and by the time you’re fitting the strike plate, your forearms ache from keeping everything perfectly aligned. But testing that Grade 1 lock afterward, feeling how solidly it engages compared to the old knob lock, makes it instantly worth the effort.
ANSI/BHMA Security Grading Explained
The American National Standards Institute (ANSI) and Builders Hardware Manufacturers Association (BHMA) rate locks based on durability and strength, helping homeowners choose the right level of protection for their doors.
Grade 1 locks are the strongest—built to withstand one million cycles for doorknobs and levers, or 250,000 cycles for deadbolts, and resist 10 strikes at 75 pounds of force. Grade 2 deadbolts handle 150,000 cycles and resist 5 strikes at 75 pounds of force, making them suitable for most residential applications. Grade 3 deadbolts must withstand 100,000 cycles and resist 2 strikes, meant primarily for interior doors or areas needing minimal security.
When purchasing new locks, checking these ANSI/BHMA ratings ensures you get genuine security, not just functional door hardware.
Deadbolts: The Gold Standard for Entry Door Security
Deadbolts are straightforward but tough: a solid metal bolt slides about an inch into your door frame. No springs, no gimmicks—just metal stopping forced entry. On exterior doors, a deadbolt is what actually keeps your home secure.
Single-Cylinder Deadbolts
These are the most common types of locks. You use a key outside, and a thumb turn inside for quick exit. The bolt engages fully into the strike plate, unlike knob locks that rely on spring latches and can be bypassed easily.
Best for: Front doors, back doors, or any external door without nearby glass.
Installation: Professional installation ensures the bolt lines up perfectly; misalignment can wear the lock and reduce security features over time. If your deadbolt is worn or not functioning smoothly, Valley Lock & Door offers deadbolt lock repair to restore its strength and reliability.
Vulnerability: If glass is near the door, someone can reach through and turn the thumb turn, so consider a different cylinder lock.
Double-Cylinder Deadbolts
Double cylinder deadbolts require a key on both sides, which stops reach-through attacks. Great for doors with glass panels or sidelights.
Safety note: You need a key to exit, which can be challenging in emergencies. The International Residential Code requires that egress doors be readily openable from inside without the use of a key, which generally prohibits double-cylinder deadbolts on residential egress doors. Check with local building officials before installation.
When to use: Some commercial settings where allowed by code, or doors with nearby glass where building codes permit. Always verify local requirements.
Lockable Thumbturn Deadbolts
A hybrid option. Normally, the thumb turn allows quick exit, but you can lock it with a key for extra security—useful when traveling or for doors with reachable glass.
Best for: Doors where you want the flexibility of both single and double-cylinder security without code violations.
Choosing the Right Deadbolt Grade
Grade 1: Maximum security for entry doors, handles serious attack attempts. Perfect for front doors and high-security applications.
Grade 2: Good for most homes, still strong and cost-effective for residential entry doors.
Grade 3: Only for interior doors; not suitable for front doors or high-risk entry points.
Deadbolts work well alongside sliding bolt locks, chain locks, or as an extra layer when purchasing locks for your Pennsylvania home.
Knob Locks: Convenience, Not Security
How Knob Locks Work
Knob locks use a simple spring-loaded latch that extends from the door edge into the frame. Turn the knob, and the latch retracts.
Easy to operate and inexpensive, but also easy to bypass. The latch can be forced back with minimal effort, and the knob itself can be broken with bolt cutters or even strong force.
When to Use Knob Locks (and When Not To)
Knob locks should never be the only lock on an external door—a common security issue in older Pennsylvania homes. They work best for:
- Interior doors, like bedrooms and bathrooms, for privacy
- Secondary locks paired with deadbolts on front doors or back doors
- Closets or storage units where security isn’t essential
Avoid relying on knob locks alone for entry doors or any external door locks that protect your home.
Upgrading from Knob-Only Entry Doors
If your exterior doors only have knob locks, adding a deadbolt is the simplest way to improve security. Many older homes in Montgomery and Berks counties still use knob-only entry points.
Valley Lock & Door helps homeowners install new locks, retrofit modern security into older doors, and adjust for non-standard door frames. This adds an extra layer of protection while keeping daily access convenient.
Lever Handle Locks: Accessibility and Ease of Use
How Lever Handle Locks Work
Lever locks swap round knobs for handles you press down, making them easier to use with full hands or limited grip strength. That’s why they’re common in commercial buildings and newer homes.
Most still rely on a spring-loaded latch, so their security features are similar to knob locks. They’re also ADA-compliant and come in various styles to match your door hardware.
Security Considerations
The spring latch is the weak point, so on exterior doors, lever locks should always be paired with a deadbolt. High-security options exist with Grade 1 ratings, reinforced latches, and anti-pry designs, offering stronger protection—but even these benefit from an additional deadbolt on entry doors.
Best Applications
Lever locks are ideal for:
- Interior doors throughout your home
- Exterior doors, when paired with a deadbolt
- Commercial properties, including office doors and storefronts
- Homes with elderly residents or anyone needing easier operation
They shouldn’t be the sole type of lock on any external door, as the latch remains the weak point.
Smart Locks: Modern Convenience with Remote Access
How Smart Locks Work
Smart locks use WiFi, Bluetooth, or Z-Wave to connect to your home network. You can lock or unlock doors via smartphone apps, enter with pin codes, fingerprints, or smartphones, and even integrate them with smart home systems for added convenience.
Types of smart locks:
- Smart deadbolts that replace traditional deadbolts
- Smart lever or knob locks
- Retrofit kits that upgrade existing deadbolts to keyless entry
Security and Convenience Benefits
Smart locks eliminate the need for physical keys and let you create temporary access codes for contractors, guests, or dog walkers. You can monitor activity with logs showing who entered when, use auto-lock features, and rely on Valley Lock & Door’s 24/7 emergency locksmith services if technical issues arise.
Potential Drawbacks and Considerations
For most digital locks, battery life ranges from 10 months to a full year under normal use, though WiFi-connected smart locks may only last 3-6 months if used frequently, while Bluetooth, Z-Wave, or Zigbee models typically achieve 10-18 months or longer.
Concerns to consider:
- Battery dependence—monitor battery levels regularly
- Cybersecurity—stick with reputable brands like Schlage, Kwikset, Yale, or August
- Installation complexity—some models need professional help
- Connectivity issues—WiFi or Bluetooth outages can affect app control
If you’re locked out and your smart lock fails, call (267) 923-5759—Valley Lock & Door offers 24/7 emergency locksmith services across Eastern Pennsylvania.
Keypad Locks: Keyless Convenience Without Smart Features
How Keypad Locks Work
Keypad locks let you enter a pin code to unlock doors—no keys or smartphone needed. Mechanical versions use purely physical mechanisms, while electronic versions are battery-powered with extra features like multiple codes or temporary lockouts.
When Keypad Locks Make Sense
Perfect for:
- Families with kids who misplace keys
- Rental properties where codes can change between tenants
- Homeowners wanting keyless entry without smart home systems
- Vacation homes or multi-user access situations
Electronic vs. Mechanical Keypad Locks
Keypad locks come in two main types, each with its own advantages and considerations.
| Feature | Electronic Keypad Locks | Mechanical Keypad Locks |
|---|---|---|
| User Codes | 10+ codes, easy to add or delete | Limited codes, harder to change |
| Power | Battery-powered | Fully mechanical, no batteries |
| Extras | Activity logs, temporary codes, and lockouts | Extremely durable, low maintenance |
Both types provide keyless convenience, so choose the option that best fits your home’s needs and lifestyle.
Mortise Locks: Heavy-Duty Security for Commercial and Older Homes
What Makes Mortise Locks Different
Mortise locks have their lock body embedded in the door edge, unlike modern surface-mounted cylinder locks. This hidden mechanism makes them extremely durable and secure. They often include multiple locking points and are common in older Pennsylvania homes and commercial buildings.
When You’ll Find Mortise Locks
You’ll see mortise locks in historic homes (pre-1950s), office buildings, storefronts, and other high-security applications. Many original locks in Eastern PA still function after decades with proper care.
Repair vs. Replacement Considerations
Many mortise locks can be repaired or rekeyed, saving money while preserving historic hardware. Replacement is needed only if the lock body is cracked, severely worn, or if modern security upgrades are desired.
Valley Lock & Door regularly helps homeowners balance maintaining old locks with upgrading to new locks for enhanced security.
Additional Lock Types for Specific Applications
Padlocks (Exterior Gates, Sheds, Garages)
Padlocks offer portable security for gates, storage units, and sheds. They range from low-cost options—easily cut with bolt cutters—to high-security models with hardened steel shackles.
For valuable items, investing in a quality padlock ensures better protection.
Cam Locks (Cabinets, Mailboxes)
Cam locks are small cylinder locks found in filing cabinets, mailboxes, and lockers. A flat metal “cam” rotates when you turn the key, catching on a strike. They’re low-security but useful when you just need to keep items closed rather than secure from forced entry.
Jimmy-Proof Deadbolts (Surface-Mounted Security)
Common in apartments and older buildings, jimmy-proof deadbolts use interlocking vertical bars instead of bolts extending into the door edge. When engaged, the two parts interlock, preventing prying attacks. They aren’t pick-proof or kick-proof, but provide solid added security when properly installed.
Local Expertise: How Valley Lock & Door Helps PA Homeowners Choose and Install the Right Locks
Understanding Eastern Pennsylvania’s Unique Lock Challenges
Older Homes and Historic Properties
Many pre-1950s homes in Montgomery, Berks, Quakertown, and Lehigh counties have non-standard door thickness, mortise locks, and vintage hardware. Valley Lock & Door adapts modern door locks to these older systems while preserving historic aesthetics.
Harsh Winter Weather
Frozen locks are common in PA winters. Choosing locks with weather-resistant features and proper lubrication (graphite-based lubricants work better than general-purpose oils in cold weather) helps prevent issues with cylinder locks and external door locks.
Matching Locks to Door Types
VLD installs Therma-Tru entry doors, Larson and ProVia storm doors, and Clopay garage doors, ensuring door hardware works correctly with steel, fiberglass, wood, and aluminum doors.
Security Concerns in Suburban and Rural Areas
Local crime patterns vary; VLD recommends the right security levels for external and interior doors across its seven-county service area, from historic downtown properties to rural homes.
When to Call a Professional Locksmith vs. DIY Lock Installation
DIY-Friendly:
- Replacing existing knob or lever locks with the same prep
- Installing interior door locks where security isn’t critical
Call a Professional:
- Installing deadbolts on solid-core doors
- Repairing or installing mortise locks
- High-security lock installation
- Rekeying existing locks
- Setting up smart locks
Why professional installation matters: Proper alignment of bolts, strike plates, and door edge positioning ensures your locks function correctly and maintain warranty coverage. A professionally installed Grade 2 deadbolt can be more secure than a poorly installed Grade 1 lock.
VLD’s Lock Services Across Eastern PA
Lock Installation: Deadbolts, smart locks, high-security locks, lever handles, and other locks are installed properly for the first time.
Rekeying Services: Update keys for new homeowners or lost keys; combine multiple locks to one key for convenience.
24/7 Emergency Lockout Service: Residential and commercial lockouts throughout Montgomery, Berks, Bucks, Chester, Delaware, Lehigh, and Northampton counties.
Lock Repair: Mortise locks, cylinder locks, stuck or broken locks, frozen locks—repair when replacement isn’t necessary.
Security Consultations: Free estimates and practical security recommendations based on 25+ years of experience.
Need help choosing or installing locks? Contact Valley Lock & Door for a free consultation: (267) 923-5759.
How to Choose the Right Lock for Each Door in Your Home
Entry Doors (Front, Back, Side)
Recommended Configuration:
- Primary: Grade 1 or Grade 2 single-cylinder deadbolt
- Secondary: Lever handle or knob lock for easy entry/exit
- Optional: Smart deadbolt for keyless convenience
Security Priority: Maximum
Front, back, and side doors are your first line of defense. If these doors only have knob locks, adding quality deadbolts instantly boosts security.
Storm Doors
Recommended Configuration:
- Lever handle lock or multi-point locking system
- Not your primary security—always lock the main entry door behind the storm door
Purpose: Weather protection and secondary security layer
Interior Doors (Bedrooms, Bathrooms, Closets)
Recommended Configuration:
- Privacy knob locks for bedrooms and bathrooms
- Passage lever handles (no lock) for hallways and closets
Security Priority: Privacy, not break-in protection
Simple locks provide enough privacy without overcomplicating access.
Garage Entry Doors (House to Garage)
Recommended Configuration:
- Deadbolt (treat like exterior entry door if garage has external access)
- Keypad lock for convenient family entry
Security Priority: High
Garages are common break-in points. Secure doors connecting garages to the home as you would your main entry doors.
Signs You Need to Upgrade or Replace Your Door Locks
Lock is hard to turn, or the key gets stuck: Worn tumblers or internal damage can lead to broken keys.
Rust, corrosion, or weather damage: Compromised locks fail faster and reduce security.
Lost or stolen keys: Rekey or replace immediately—you don’t know who might have them.
Moving into a new home: Always rekey; previous owners, contractors, or agents may still have keys.
Entry doors with Grade 3 or unknown locks: Upgrade to Grade 1 or Grade 2 for real protection.
Knob lock as the only exterior lock: Critical security gap; add deadbolts.
Older mortise locks with worn components: Often repairable by professionals.
Desire for keyless or smart lock convenience: Time to upgrade.
Break-in attempt or damaged lock: Replace immediately; internal mechanisms may be compromised.
Rekeying vs. Replacing: What’s the Best Option?
Homeowners often wonder whether rekeying or replacing locks is the better choice. Here’s a quick comparison to help you decide.
| Feature | Rekeying | Replacing |
|---|---|---|
| What it is | Damaged locks, upgrading to Grade 1 or higher quality locks, adding deadbolts, and smart locks | Install new lock hardware |
| Best for | Good locks, lost keys, standardizing to one key | Provides additional security, new key-operated locks, access to popular brands, and modern features |
| Benefits | Cost-effective, fast, and maintains the existing locking mechanism | Provides additional security, new key-operated locks, access to popular brands and modern features |
Both options improve home security; choose rekeying for convenience and cost savings, or replacement for higher security and updated hardware.
Securing Your Pennsylvania Home with the Right Lock Combination
For strong home security, entry doors need Grade 1 or Grade 2 deadbolts—knob locks alone won’t cut it. Smart locks add convenience, but choose trusted brands, and always rekey when moving into a new home.
Match locks to door use: entry doors for maximum security, interior doors for privacy, storm doors for secondary protection. Professional installation ensures proper alignment, strike plate placement, and bolt depth for optimal security and warranty protection.
Deadbolts are the gold standard, while smart locks complement but don’t replace them. Older Pennsylvania homes often need expert help for mortise locks or retrofitting modern security. Rekeying is cost-effective, and using the right lock types throughout your home creates layered protection.
Valley Lock & Door has served Eastern Pennsylvania homeowners since 2011 with expert lock installation, rekeying, and 24/7 emergency locksmith services—backed by Bob McCarty’s 25+ years of hands-on experience, PA License #PA084709, and a BBB A+ rating. Unsure which locks are right for your home? Call (267) 923-5759 or request a free estimate online.
Frequently Asked Questions About Types of Door Locks
What are the different types of door locks?
Common types of door locks include knob locks, lever locks, cylinder locks, euro cylinder locks, deadbolts, rim locks, barrel bolts, and padlocks. Each type of lock has a specific level of security and suits certain doors.
Knob locks work for internal doors, while deadbolts or cylinder locks provide extra security for exterior doors. Some locks permanently attach to the door edge, while others allow keyed entry for flexibility.
What kind of door lock is most secure?
Grade 1 deadbolts offer the highest level of security, withstanding 250,000 cycles and resisting 10 strikes of 75 pounds of force. Cylinder locks and double cylinder deadbolts installed on exterior doors provide strong resistance against forced entry.
Adding a second layer, like a chain lock, increases safety. For front doors and main access points, Grade 1 or Grade 2 deadbolts are considered the highest level of security.
Is it cheaper to rekey or replace a lock?
Rekeying is generally cheaper than installing new locks because it involves changing the internal cylinder, so old keys no longer work. However, if the lock is broken, outdated, or lacks modern security features, replacing it might be the better long-term option.
Installing a new type of lock can provide additional safety, a second layer of protection, and improved access control. Replacing a lock may require minor work on the door edge or door hardware, but usually results in a more secure setup for both exterior and interior doors.
