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7 Best Double Sided Smart Lock Models You Can Buy in 2025

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In today’s rapidly evolving smart home landscape, securing your property effectively has never been more important. The traditional lock and key system is quickly becoming obsolete as homeowners and businesses seek more sophisticated security solutions. Double sided smart locks represent one of the most significant advancements in door security technology available in 2025, offering protection and convenience that conventional locks simply cannot match.

A double sided smart lock provides electronic access controls on both the interior and exterior sides of your door. Unlike standard smart locks that only secure one side (typically the exterior), double sided smart locks offer comprehensive protection by requiring authorized access from either direction. This dual-control mechanism significantly enhances security while eliminating the need to carry physical keys altogether.

Throughout this comprehensive guide, we’ll examine the best double sided smart lock options on the market today, explore their unique features, compare their specifications, and provide actionable advice to help you choose the perfect lock for your specific needs. Whether you’re securing a residential property, vacation rental, or commercial space, this article will equip you with the knowledge needed to make an informed decision.

Why Choose a Double Sided Smart Lock?

The growing popularity of double sided smart locks isn’t simply due to technological novelty – these advanced security devices offer tangible benefits over conventional locks and even single-sided smart locks.

Enhanced Security

Double sided smart locks provide an exceptional level of security for several reasons:

  1. First, they eliminate the vulnerability of having a manual thumb turn on the interior side. In traditional setups, intruders who break glass or otherwise access the interior thumb turn can easily unlock the door. With a double sided smart lock, both sides require electronic authentication.
  2. Second, these locks typically incorporate advanced anti-tampering features like automatic lockout after multiple incorrect attempts, tamper alarms, and encrypted communication protocols to prevent digital attacks.
  3. Third, many models use robust materials and construction techniques that resist physical attacks like lock bumping, picking, or drilling that might compromise conventional locks.

Convenience & Versatility

Beyond security enhancements, double sided smart locks offer remarkable convenience:

You’ll never need to fumble for keys when your hands are full, regardless of which side of the door you’re on. Whether you’re bringing groceries inside or taking out the trash, keyless entry from both directions streamlines daily movements.

Most double sided smart locks allow you to create temporary access codes for visitors, service providers, or rental guests. You can customize access schedules, monitor entry events, and revoke permissions remotely – all features impossible with traditional lock systems.

Many models also integrate with smart home ecosystems, enabling voice control or automated sequences like unlocking when you arrive home or locking automatically at bedtime.

Rental & Commercial Applications

Double sided smart locks excel in multi-user environments:

For vacation rental owners, these locks eliminate the logistics of key handoffs and the security risks of lost or duplicated keys. Owners can provide temporary access codes that automatically expire after the rental period ends.

In office settings, double sided smart locks allow businesses to control and monitor access to sensitive areas while maintaining detailed entry logs for security audits.

Multi-tenant buildings benefit from the ability to provide different access levels to various users – residents might have 24/7 access while delivery personnel could be restricted to specific time windows.

Comparison to Single-Sided & Traditional Locks

When compared to single-sided smart locks, double sided models offer complete control over both entry and exit. This prevents unauthorized persons who might gain access to the interior side of the door from exiting without proper authentication.

Traditional locks rely entirely on mechanical components that can wear out or be compromised through various physical attacks. Double sided smart locks incorporate electronic security layers that significantly complicate unauthorized access attempts.

While traditional locks require physical key management (including the security risks of lost or copied keys), double sided smart locks eliminate these concerns entirely through digital credential management.

Top 7 Double Sided Smart Lock Models for 2025

After extensive research and hands-on testing, these seven double sided smart locks stand out as the best options currently available:

Key Features:

  • Dual cylinders with independent keypad controls on both interior and exterior
  • Elegant matte black finish that resists fingerprints and scratches
  • Waterproof construction suitable for indoor and outdoor installation
  • One-touch locking capability from either side
  • Up to 20 unique user codes with separate administrator functions
  • Auto-lock functionality with customizable delay timing

Pros

  1. Exceptional build quality with all-metal construction
  2. Simple DIY installation compatible with standard door preparations
  3. Intuitive programming without requiring smartphone connectivity
  4. Reliable performance in all weather conditions

Cons

  1. Limited smart home integration options
  2. No fingerprint access capability
  3. Smaller code capacity compared to premium models

Technical Specifications:

  • Fits doors: 1⅜” to 2″ thick
  • Power source: 4 AAA batteries (approximately 8-month lifespan)
  • Operating temperature: -4°F to 140°F
  • Waterproof rating: IP65
  • Warranty: 12 months

Premium Protection

Secure both sides of your door with the sleek, weatherproof iuknob—offering one-touch locking and up to 20 unique codes for maximum control.

Key Features:

  • Impressive 50-user code capacity with hierarchical permission levels
  • Waterproof design with sealed keypads for reliable operation in all conditions
  • Programmable auto-lock with adjustable timing (5 seconds to 3 minutes)
  • Passage mode option for temporary unrestricted access during events
  • Advanced anti-peep code entry system
  • Mechanical key backup with pick-resistant cylinder

Pros

  1. Intuitive programming directly from the keypad
  2. Excellent battery efficiency with up to 12 months between replacements
  3. Visual and audible low battery warnings
  4. Consistent performance record across varied environments

Cons

  1. No smartphone connectivity or remote management
  2. Limited finish options (currently only available in satin nickel)
  3. Slightly bulkier design than some competitors

Technical Specifications:

  • Fits doors: 1⅜” to 2¼” thick
  • Power source: 4 AA batteries with emergency power port
  • Operating temperature: -22°F to 140°F
  • Waterproof rating: IP66
  • Warranty: 18 months

Ultimate Access Control

With 50 programmable codes and anti-peep entry, the IU-20 is made for busy homes and offices—rely on its robust, waterproof design day after day.

Key Features:

  • Adjustable deadlatch compatible with both 2⅜” and 2¾” backsets
  • Premium zinc-alloy body with rust-resistant components
  • Independent programming for interior and exterior keypads
  • Illuminated keypad for nighttime visibility
  • Vacation mode that temporarily disables all user codes
  • Automatic lockout after multiple incorrect attempts

Pros

  1. Exceptional versatility for various door configurations
  2. Silent operation mode for noise-sensitive environments
  3. Straightforward installation with comprehensive instructions
  4. Outstanding weather resistance for exposed locations

Cons

  1. No remote access capabilities
  2. Limited to 20 user codes
  3. Slightly longer learning curve for programming advanced features

Technical Specifications:

  • Fits doors: 1⅜” to 2⅜” thick
  • Power source: 4 AA batteries (approximately 10-month lifespan)
  • Operating temperature: -31°F to 158°F
  • Weatherproof rating: IP55
  • Warranty: 12 months with extended option

Built to Last

Enjoy silent operation and adjustable backsets with Casmer’s zinc-alloy lock—perfect for any door setup and engineered for years of reliable security.

Key Features:

  • Backlit PIN keypad on both sides with independent programming
  • Supports up to 50 unique access codes per keypad (100 total)
  • Advanced anti-peep PIN entry technology
  • Customizable auto-lock timer ranging from 2 seconds to 12 hours
  • Silent mode option for discreet operation
  • USB-C emergency power port for backup access

Pros

  1. Exceptionally versatile fitting range accommodating most door thicknesses
  2. IPX5 weatherproof rating suitable for exposed outdoor installations
  3. Impressive battery life with approximately one year between replacements
  4. Strong customer support with responsive service

Cons

  1. No smartphone or smart home integration
  2. Programming requires following detailed manual steps
  3. Limited finish options currently available

Technical Specifications:

  • Fits doors: 1⅜” to 2¾” thick (wood or metal)
  • Power source: 4 AAA batteries with USB-C emergency backup
  • Operating temperature: -13°F to 149°F
  • Weatherproof rating: IPX5
  • Warranty: 24 months

All-Weather Dependability

Dual independent keypads and USB-C emergency power keep you secure in any environment—count on BOTHSTAR for premier, hassle-free protection.

Key Features:

  • Fingerprint recognition technology supporting up to 100 unique fingerprints
  • Dual PIN keypads with independent code storage
  • Remote code generation capability through smartphone app
  • True dual-cylinder design for complete access control
  • Multi-factor authentication options for highest security applications
  • Real-time access logs with user identification

Pros

  1. Exceptional convenience with fast fingerprint recognition
  2. Flexible access options suitable for diverse user preferences
  3. Smartphone app provides simple management interface
  4. Strong security features with anti-tampering protections

Cons

  1. Higher price point than non-biometric alternatives
  2. App requires Bluetooth proximity for management functions
  3. Slightly more complex installation process

Technical Specifications:

  • Fits doors: 1⅜” to 2½” thick
  • Power source: Rechargeable lithium battery (3-month operation)
  • Operating temperature: -4°F to 140°F
  • Weatherproof rating: IP54
  • Warranty: 18 months

Biometric + Keypad Security

Combine fast fingerprint access with dual PIN keypads and real-time logs—BOTHSTAR’s premium model keeps your home secure and under your control.

Key Features:

  • Fully mechanical operation with no batteries required
  • All-weather zinc alloy construction with impressive durability
  • Anti-peep button design prevents code observation
  • Double-sided operation with identical access from both sides
  • Simple push-button combination mechanism
  • Programmable codes with thousands of possible combinations

Pros

  1. No power source required - will never fail due to dead batteries
  2. Exceptionally simple operation suitable for all user types
  3. Virtually maintenance-free design with minimal moving parts
  4. Outstanding environmental resistance in all weather conditions

Cons

  1. Limited to single access code at any time
  2. No electronic features like auto-locking or access logs
  3. Requires manual reprogramming to change codes

Technical Specifications:

  • Fits doors: 1⅜” to 2¼” thick
  • Power source: None required (mechanical operation)
  • Operating temperature: -40°F to 180°F
  • Weatherproof rating: IP68 equivalent (fully sealed)
  • Warranty: Lifetime limited

Zero-Maintenance Security

No batteries, no electronics—just rugged zinc-alloy and anti-peep buttons. Perfect for locations where power can’t be trusted.

Key Features:

  • Adjustable deadlatch compatible with multiple backset dimensions
  • Easy clamp-on installation requiring minimal tools
  • Programmable auto-lock timer with multiple delay options
  • Independent keypad control from both sides
  • Low-profile design with sleek modern aesthetic
  • Up to 30 unique user codes with hierarchical permission structure

Pros

  1. Accommodates an impressive range of door thicknesses
  2. Simple installation process suitable for DIY users
  3. Good battery efficiency with approximately 8-month lifecycle
  4. Solid build quality with metal internal components

Cons

  1. No smart connectivity options
  2. Limited to basic keypad functionality
  3. Fewer advanced security features than premium models

Technical Specifications:

  • Fits doors: 1.38″ to 2.9″ thick
  • Power source: 4 AA batteries
  • Operating temperature: -4°F to 140°F
  • Weatherproof rating: IP54
  • Warranty: 12 months

DIY-Friendly Protection

Clamp-on installation plus customizable auto-lock timing make this lock the best blend of convenience and security for any DIYer.

Side-by-Side Comparison Table

ModelAccess MethodsDoor CompatibilityPower SourceSmart IntegrationPrice RangeAmazon Rating
iuknob Double SidedKeypad + Key1⅜”–2″4 AAA (8 mo)None$119–$129★ 4.1 (138)
IU-30 Code Door LockKeypad + Key1⅜”–2¼”4 AA (12 mo)None$47–$59★ 4.2 (1,143)
Casmer UpgradeKeypad + Key1⅜”–2⅜”4 AA (10 mo)None$79–$99★ 4.2 (215)
BOTHSTAR KeypadKeypad + Key1⅜”–2¾”4 AAA (12 mo)None$119–$129★ 4.2 (3,652)
BOTHSTAR FingerprintFingerprint + PIN + App1⅜”–2½”Rechargeable (3 mo)Bluetooth App$169–$179★ 4.0 (87)
Mechanical ButtonMechanical Buttons1⅜”–2¼”None (mechanical)None$115–$139★ 4.1 (312)
“New Upgrade”Keypad + Key1.38″–2.9″4 AA (8 mo)None$79–$99★ 4.2 (154)


Best Value
: IU-30 Code Door Lock offers exceptional performance and reliability at a mid-range price point.

Best for Heavy Use: BOTHSTAR Keypad model delivers outstanding durability with the highest review count proving consistent performance.

Best for Outdoors: Mechanical Button lock provides maximum weather resistance with no electronic components to fail.

Most Versatile: “New Upgrade” model accommodates the widest range of door thicknesses.

Most Advanced: BOTHSTAR Fingerprint model offers cutting-edge biometric technology and app connectivity.

Installation Tips & Best Practices

Proper installation ensures both the security and functionality of your double sided smart lock. Follow these guidelines for best results:

Pre-Installation Checklist

Before beginning installation, complete these essential preparations:

  1. Measure your door thickness at the installation point to confirm compatibility with your chosen lock.
  2. Identify your door’s backset dimension (typically 2⅜” or 2¾” from edge to center of the existing lock) to ensure proper alignment.
  3. Determine whether your door has existing bore holes or requires new drilling (most residential doors have standard 2⅛” bore holes).
  4. For clamp-on installations, verify sufficient flat surface area on both sides of the door for secure mounting.
  5. Gather all necessary tools before starting: typically a Phillips screwdriver, measuring tape, pencil, and potentially a drill with appropriate bits.

Step-by-Step DIY Guide (General Overview)

While specific installation varies by model, most double sided smart locks follow this general process:

  1. Remove existing lock hardware completely, including the latch mechanism in the door edge.
  2. Install the new latch mechanism, ensuring it’s oriented correctly (the curved side should face the direction the door closes).
  3. Connect any necessary cables between the exterior and interior units.
  4. Mount the exterior keypad unit, feeding any connecting cables through the door carefully.
  5. Attach the interior unit, securing it to the exterior unit using the provided mounting hardware.
  6. Install batteries and perform initial programming according to manufacturer instructions.
  7. Test operation from both sides thoroughly before closing the door.

Common Pitfalls to Avoid

Be aware of these frequent installation mistakes:

  • Overtightening mounting screws, which can warp components and affect operation
  • Incorrect latch orientation, preventing proper door closure
  • Damaging connecting cables during installation
  • Failing to program master codes before testing, potentially resulting in lockouts
  • Not testing all functions (lockout mode, emergency override, etc.) before finalizing installation

When to Hire a Professional

Consider professional installation in these circumstances:

  • Your door requires significant modification to accommodate the new lock
  • Your door is non-standard (extremely thick, thin, or made of unusual materials)
  • You need to integrate the lock with complex security or smart home systems
  • You’re installing multiple units that need to work together in a master key system
  • You’re uncomfortable working with door hardware and concerned about security implications

Maintenance, Troubleshooting & Firmware Updates

Proper maintenance ensures long-term reliability of your double sided smart lock:

Battery Replacement & Emergency Power

For battery-powered models:

  • Replace batteries proactively when they reach approximately 20% capacity
  • Use high-quality alkaline or lithium batteries appropriate for your climate
  • Clean battery contacts periodically to prevent corrosion
  • For emergency access during complete power failure, keep a 9V battery or appropriate USB power bank accessible but secure

Cleaning & Caring for Keypads/Fingerprint Readers

Maintain optimal performance with proper cleaning:

  • Clean fingerprint sensors monthly using a microfiber cloth slightly dampened with isopropyl alcohol
  • Remove dirt and oils from keypads using a soft brush and mild cleaner
  • Avoid harsh chemicals that might damage protective coatings or electronic components
  • For outdoor installations, periodically check weatherproofing seals for integrity

Re-enrolling or Deleting User Codes/Fingerprints

Manage access credentials effectively:

  • Audit user codes quarterly, removing access for individuals who no longer require it
  • Re-scan frequently used fingerprints every 6 months to improve recognition accuracy
  • Document master codes securely but accessibly in case of emergency
  • Consider periodically changing all codes as a security best practice

Updating Lock Firmware via App

For connected models:

  • Check for available firmware updates monthly for security improvements
  • Follow manufacturer’s specific update procedures precisely
  • Ensure adequate battery power before initiating firmware updates
  • Avoid interrupting update processes, which could potentially damage the lock’s electronics

Contacting Manufacturer Support

When to seek professional assistance:

  • If the lock becomes unresponsive to valid credentials
  • If you notice unusual battery drain or operational problems
  • When mechanical components show signs of wear or damage
  • If you hear unusual sounds during operation that might indicate internal problems

Most manufacturers provide dedicated support channels for troubleshooting assistance.

Frequently Asked Questions about Double Sided Smart Lock

Are double sided locks illegal?

No, double sided smart locks are not generally illegal, but there are important considerations regarding building codes and safety regulations. Fire safety codes in some jurisdictions restrict certain types of double keyed deadbolts (requiring keys on both sides) because they could impede emergency egress during a fire. However, most double sided smart locks are specifically designed to comply with these regulations by providing emergency egress capabilities through:

  • One-touch panic release functions that override normal authentication
  • Automatic unlocking when smoke alarms are triggered (for connected models)
  • Fail-safe mechanisms that default to unlocked during power or system failures

Always check local building codes before installation, particularly for commercial properties or rental units where stricter regulations may apply.

 

Is there a door lock that locks from both sides?

Yes, double sided smart locks are specifically designed to lock and unlock from both sides using electronic authentication rather than keys or thumb turns. These specialized locks require authorized access (via PIN code, fingerprint, app, or other methods) from either direction. This dual-control capability makes them ideal for situations requiring controlled access in both directions, such as:

  • Secure rooms within commercial facilities
  • Home offices or areas containing valuable items
  • Rental properties where tenant security is paramount
  • Homes with glass doors where preventing inside access to manual thumb turns enhances security

All seven models reviewed in this article provide this double sided locking functionality with various authentication methods and features.

 

What are the disadvantages of a smart door lock?

While double sided smart locks offer numerous advantages, potential disadvantages include:

Power Dependency: Most electronic locks rely on batteries or external power, creating potential failure points during power outages (though many include backup power options).

Initial Cost: Quality double sided smart locks typically cost more than traditional mechanical locks, with prices ranging from $70 to $200+ depending on features.

Technical Complexity: Programming, troubleshooting, and maintaining electronic locks requires some technical comfort level beyond what traditional locks demand.

Potential Electronic Failures: Electronic components can malfunction due to moisture, extreme temperatures, or manufacturing defects (though quality models minimize these risks).

Limited Retrofit Options: Some doors may require modification to accommodate smart lock hardware, particularly older doors with non-standard dimensions.

Despite these considerations, many users find the security and convenience benefits far outweigh these potential drawbacks.

 

What door locks can be opened from both sides?

Several types of locks can be operated from both sides, each with distinct characteristics:

Double Sided Smart Locks: As detailed throughout this article, these electronic locks require authentication from either side through keypads, fingerprints, or other methods.

Double Cylinder Deadbolts: Traditional mechanical locks requiring keys on both interior and exterior sides, though these may face restrictions in some building codes.

Hotel-Style Locks: Mechanical locks with keyed access from outside and lever/knob operation from inside, though these don’t provide security against unauthorized exit.

Interconnected Locks: Combined latch and deadbolt systems that can be operated from both sides but typically allow free egress from inside.

Among these options, double sided smart locks offer the unique combination of convenience, security, and access control from both directions that make them ideal for many modern applications.

Buyer's Guide: How to Pick Your Ideal Double Sided Smart Lock

With numerous options available, use this systematic approach to identify the perfect double sided smart lock for your needs:

Budget Tiers

Double sided smart locks generally fall into three price categories:

Economy ($60-$90): Basic models like the Mechanical Button lock offer fundamental security without electronic features. These locks provide reliable operation but limited convenience features.

Mid-Range ($90-$150): The sweet spot for most users, models like the IU-20 and BOTHSTAR Keypad balance quality construction with useful features like multiple user codes and weatherproofing.

Premium ($150-$200+): Advanced models like the BOTHSTAR Fingerprint offer cutting-edge technology including biometrics, app connectivity, and extensive user management capabilities.

Consider your security requirements and convenience preferences when determining your budget, remembering that this is a long-term investment in your property’s security.

Feature Prioritization

Identify which capabilities matter most for your specific situation:

Access Method Priority: Determine whether rapid access (fingerprint), code sharing (keypad), or remote management (app connectivity) is most important for your needs.

Security vs. Convenience: Higher security typically involves more authentication steps, while maximum convenience might sacrifice some security layers. Find your ideal balance.

User Management Requirements: For multi-user environments like rental properties or offices, prioritize locks with extensive user code capacity and temporary access capabilities.

Environmental Considerations: For exposed outdoor installations, weather resistance should take precedence, while indoor applications might prioritize aesthetic consistency with existing hardware.

Long-Term Support & Warranty

The expected lifespan of quality double sided smart locks exceeds five years with proper maintenance, making support considerations important:

Warranty Length: Look for at least 12 months coverage, with 18-24 months indicating manufacturer confidence in reliability.

Replacement Parts Availability: Confirm that batteries, mechanical components, and electronic modules are readily available should replacement become necessary.

Firmware Update Process: For connected models, regular firmware updates indicate ongoing support and security improvements.

Customer Service Reputation: Research manufacturer responsiveness through review analysis beyond just product quality ratings.

Brand Reputation & Customer Service

Established manufacturers typically offer more reliable products and support:

While newer brands like BOTHSTAR have demonstrated impressive product quality, they may have less established support infrastructure than legacy security companies.

Review aggregate ratings across multiple platforms rather than relying solely on single-source reviews to gauge true customer satisfaction.

Consider how long replacement parts might remain available when evaluating lesser-known brands against market leaders.

Accessory Ecosystem

Some locks benefit from available accessories that enhance functionality:

Wi-Fi Bridges: External devices that connect Bluetooth locks to your home network for remote access.

External Power Banks: Specialized backup power solutions designed specifically for emergency lock access.

Alternative Access Methods: Some systems offer optional RFID card/fob readers or keypad extensions.

Monitoring Sensors: Door position sensors that integrate with smart locks to provide complete access monitoring.

Evaluate whether your chosen lock supports a broader ecosystem of compatible accessories for future expansion.

Conclusion & Final Recommendations

Double sided smart locks represent a significant advancement in door security technology, providing unprecedented control, convenience, and protection for your property. By requiring authorized access from both sides of the door, these innovative devices eliminate vulnerabilities present in traditional locks and single-sided smart locks.

After comprehensive evaluation, we recommend these standout models for specific needs:

Best Overall Value: The IU-30 Code Door Lock delivers exceptional reliability, extensive user code capacity, and impressive weather resistance at a reasonable mid-range price point. Its proven track record across over 1,000 reviews demonstrates consistent quality and customer satisfaction.

Best for Maximum Security: The BOTHSTAR Fingerprint model provides multi-factor authentication options and advanced anti-tampering features ideal for high-security applications. Its biometric capabilities and smartphone connectivity offer both convenience and rigorous access control.

Best for Reliability: The Mechanical Button lock stands alone in requiring no power source, making it entirely immune to electronic failures or battery issues. For applications where absolute reliability trumps convenience features, this unique mechanical solution excels.

Best for Rental Properties: The BOTHSTAR Keypad model’s extensive code capacity, simple programming, and durable construction make it ideal for high-turnover environments requiring frequent access changes and robust performance.

No matter which double sided smart lock you select, you’ll benefit from significantly enhanced security and convenience compared to traditional locking systems. The peace of mind that comes from knowing your property is protected from unauthorized access from either direction is well worth the investment in these advanced security devices.

When you’re ready to upgrade your door security, simply click through our affiliate links to find current pricing and availability for these top-performing double sided smart locks. Your home or business security deserves this important upgrade in 2025 and beyond.

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