Key Takeaways
- Single-cylinder deadbolts are simple, affordable, and easy to install but offer limited protection against broken glass entry.
- Double-cylinder deadbolts add security at the cost of emergency egress—avoid them where quick escape is needed.
- Smart deadbolts offer convenience and remote control; choose models with a physical key backup and strong encryption.
- High-security/Grade 1 deadbolts provide the best physical resistance, ideal for higher-risk homes or commercial-grade protection.
Single-Cylinder Deadbolt
Best For: Budget-conscious homeowners with standard door setups who want straightforward security and easy installation.
Price Range: $15 - $60 for most consumer models; $60+ for higher-quality brands
Pros
- Affordable and widely available; easy to find replacements
- Simple operation with a keyed exterior and thumb-turn interior
- Easy to install as a DIY weekend project on standard doors
- Lower maintenance and no batteries required
Cons
- Vulnerable if there’s glass near the door—intruder can reach through and turn the interior thumb-turn
- Fewer advanced features compared with smart locks (no remote access or activity logs)
- Security level depends on cylinder quality; cheap models can be picked or bumped
Double-Cylinder Deadbolt
Best For: Homes with glass panels next to the door where alternative escape plans are in place and you accept the added inconvenience.
Price Range: $30 - $150 depending on cylinder quality and brand
Pros
- Requires a key on both sides, preventing entry through broken glass or mail slots
- Can deter opportunistic burglars when glass is present near the door
- Adds a psychological barrier; more secure against quick smash-and-grab attempts
Cons
- Serious egress hazard—occupants may not be able to escape quickly in an emergency if keys are not accessible
- More inconvenient because every exit requires a key
- Legal or building-code restrictions may apply in some jurisdictions
Smart (Electronic) Deadbolt
Best For: Tech-savvy homeowners who want convenience, temporary access control (guests, tradespeople), and integration with smart-home systems.
Price Range: $100 - $350+ depending on features and brand; professional installation may add cost
Pros
- Keyless entry options (keypad, fingerprint, smartphone) increase convenience
- Remote locking/unlocking, guest codes, and activity logs improve access control
- Many models offer auto-locking, geofencing, and integration with home automation
- Physical key backup available on most models for redundancy
Cons
- Higher up-front cost and possible subscription fees for cloud services or advanced features
- Requires batteries and periodic charging; lockout risk if batteries die without backup
- Potential vulnerability to hacking if using weak passwords or unencrypted connections
High-Security / Commercial Grade Deadbolt (ANSI Grade 1)
Best For: Homeowners in high-crime areas, those seeking maximum physical security, or users wanting commercial-grade protection.
Price Range: $100 - $400+; professional installation often recommended
Pros
- Highest mechanical strength and resistance to forced entry (kick-ins, drilling, wrenching)
- Often includes pick-resistant, drill-resistant cores and reinforced hardware
- Ideal for exterior doors in high-risk areas or where insurance discounts are desired
Cons
- Higher cost and sometimes heavier hardware that may require door or frame reinforcement
- More complex installation may require professional fitting and door/frame upgrades
- Less emphasis on convenience features like keyless entry unless combined with electronic systems
Our Recommendation
Smart deadbolt with keyed backup (choose an ANSI Grade 1 or 2 certified model)
A smart deadbolt with a physical key backup balances convenience, access control, and security. Choose a model that’s ANSI Grade 1 or 2 for robust mechanical resistance, supports secure wireless standards (e.g., Z-Wave, Bluetooth with strong encryption), and provides a keyed cylinder to avoid being locked out if batteries fail.
When to Call a Professional
Call a professional locksmith or qualified installer if: you need a Grade 1 deadbolt correctly fitted to a reinforced door/frame; your door requires resizing or frame reinforcement; you’re replacing a lock on a non-standard door thickness or retrofitting a smart deadbolt into a multi-point locking system; you’ve lost all keys and need a secure rekey or replacement; or if local building codes require certain lock types. Also call a pro if you’re unsure about electrical wiring for a hardwired smart lock or if you want a secure integration with an existing alarm or home automation platform.
Frequently Asked Questions
Is a smart deadbolt less secure than a traditional deadbolt?
A smart deadbolt can be as secure as a traditional deadbolt when you choose a reputable model with strong mechanical components and secure wireless protocols. Look for ANSI/BHMA grading, encrypted communication (avoid open or proprietary weak protocols), and a physical keyed backup. Security risks include weak passwords, outdated firmware, and lost devices; mitigate them with unique strong passwords, two-factor authentication where available, and regular firmware updates.
Are double-cylinder deadbolts legal and safe for home use?
Double-cylinder deadbolts are legal in many areas but may violate local building codes or fire-safety regulations because they can prevent quick escape during emergencies. Always check local codes and consider safer alternatives, such as laminated or reinforced glass, security film, or installing a single-cylinder deadbolt combined with a keyed glass-break sensor. If you choose a double-cylinder, keep a key in a designated quick-access location inside the home.
What is ANSI/BHMA grading and why does it matter?
ANSI/BHMA grades (1, 2, 3) rate a lock’s mechanical strength, durability, and security performance. Grade 1 is the highest residential/commercial standard, offering the best resistance to forced entry and the longest life cycle. Grade 2 is suitable for most residential applications, and Grade 3 is basic security suitable for low-traffic doors. Choose Grade 1 or 2 for exterior deadbolts to ensure superior protection.
Can I install a deadbolt myself?
Many single-cylinder and some double-cylinder deadbolts are designed for DIY installation with common tools and a template. However, smart locks and high-security deadbolts can be more complex—requiring correct alignment, door reinforcement, wiring or network setup, and possible frame upgrades. If the door or frame is damaged, the door is non-standard, or you’re installing an ANSI Grade 1 lock, hiring a professional ensures proper fit and maximum security.
How important is the door frame when choosing a deadbolt?
The door frame is critical. A strong deadbolt can be undermined by a weak frame. For high-security deadbolts or doors exposed to forced entry attempts, reinforce the frame with a strike plate, longer screws (3 inches into the stud), and a reinforced jamb. If the frame is rotted, cracked, or hollow-core, replace or reinforce it before relying on a premium lock.