Top 6 Secure Locks for French Doors in 2025: A UK Guide

Why Your French Doors Deserve More Than Just a Standard Lock

French doors are a beautiful architectural feature, flooding a property with light and offering elegant access. However, their dual-door design and large glass panes present unique security challenges that standard, single-point locks often fail to address adequately. The central meeting point of the two doors creates an inherent weak spot, and the expansive glass can be a target for forced entry. For professionals in enforcement, property management, and corporate security, overlooking these vulnerabilities is not an option. A standard lock simply doesn't account for the specific ways these doors can be compromised, from prying the doors apart to simply breaking a pane to operate the interior turn-knob.

This guide moves beyond generic advice to provide a curated roundup of the most secure locks for French doors available for the UK market. We will analyse high-tech smart locks that offer unparalleled access control and audit trails, alongside robust mechanical multi-point systems designed for maximum physical resistance. Our goal is to equip you with the detailed knowledge needed to make an informed decision, ensuring a property's most attractive feature is also one of its most fortified. We'll examine the specific scenarios where each lock excels, providing actionable insights to help you secure assets effectively.

1. Yale Real Living YRD256 Assure Lock SL Connected by August

The Yale Real Living YRD256 Assure Lock SL represents a premier choice for securing French doors, blending Yale's longstanding reputation for robust lock manufacturing with the advanced smart capabilities of August Home. This sleek, keyless deadbolt is particularly well-suited for doors with large glass panels, a common feature of French doors, as its design eliminates the physical key cylinder, a frequent target for burglars. Access is granted through a backlit numeric keypad, the August Connect smartphone app, or voice commands via popular smart home assistants, offering a versatile and highly secure entry system.

This model excels in environments requiring controlled and logged access, making it a powerful tool for commercial property managers and corporate security officers. Its ability to generate temporary or time-sensitive access codes is invaluable for granting entry to maintenance staff, enforcement agents, or liquidators without compromising long-term security. The lock's activity log, accessible via the app, provides a clear audit trail of who has accessed the property and when.

Key Benefits and Implementation Tips

The true strength of the YRD256 lies in its integration capabilities. When paired with the included August Connect Wi-Fi Bridge, you gain remote control over the lock from anywhere. This allows a property manager to lock or unlock a door for an authorised visitor from another location, check the lock's status, and receive instant alerts for any activity.

To maximise its effectiveness as one of the most secure locks for French doors, consider these practical tips:

• Create Tiered Access: Set up unique, permanent codes for trusted personnel and temporary codes for short-term visitors or contractors. This granular control is essential for managing access to sensitive commercial properties.
• Enhance Connectivity: Ensure the Wi-Fi router is positioned within 30 feet of the lock to guarantee stable performance for remote operations and real-time notifications.
• Integrate with Sensors: For comprehensive security, pair the lock with door position sensors. The August app's DoorSense™ technology can confirm if the door is physically closed before it is locked, preventing accidental insecure states.
• Conduct Regular Audits: Performing a thorough security risk assessment will help identify how this lock fits into your overall security strategy and highlight any potential vulnerabilities in the door's structure itself.
• Maintain Power: Use high-quality lithium batteries and plan for annual replacement to avoid unexpected power loss, though the lock provides ample low-battery warnings.

2. Schlage Encode Smart WiFi Deadbolt

The Schlage Encode Smart WiFi Deadbolt is a formidable contender when seeking secure locks for French doors, prized for its robust construction and direct-to-WiFi connectivity. This model simplifies the smart lock experience by eliminating the need for an external hub or bridge, connecting straight to your property's wireless network. Its design, featuring a durable, fingerprint-resistant touchscreen and a traditional key override, offers multiple layers of access, making it exceptionally reliable for high-traffic or critical entry points like French doors on commercial or residential properties.

This lock’s utility is particularly evident in scenarios requiring flexible yet monitored access. For instance, it is often installed in upscale residential developments where French doors open to pool areas, allowing property managers to grant temporary access to residents or maintenance crews. Similarly, boutique hotels utilise it to secure balcony doors, and it is a preferred solution for home offices with separate French door entrances, enabling business owners to manage client or delivery access without distributing physical keys. The lock's ability to store up to 100 unique access codes makes it highly scalable for such professional applications.

Key Benefits and Implementation Tips

A key advantage of the Schlage Encode is its built-in alarm technology, which can detect potential security breaches at the door and emit a loud alert. This feature, combined with its ANSI/BHMA Grade 1 certification, the highest residential security rating, offers significant peace of mind. For professionals managing multiple properties, the Schlage Home app (or Key by Amazon app) provides a centralised platform to manage codes, view access history, and customise lock settings from anywhere.

To optimise the Schlage Encode as one of the most secure locks for French doors, consider these implementation strategies:

• Verify Door Specifications: Before purchase, confirm that your French door's thickness is compatible, typically between 35mm (1-3/8") and 44mm (1-3/4"). This ensures a secure and flush fit.
• Leverage Geofencing: Set up the geofencing feature within the app. This can be configured to automatically lock the door when a designated user's smartphone leaves a predefined geographic area, preventing the property from being left unsecured.
• Programme Customised Alarms: Configure the built-in alarm settings to your specific needs. You can choose between activity, tamper, or forced entry alerts, ensuring you are notified of different types of disturbances at the door.
• Conduct Monthly Tests: Regularly test the alarm functions and the low-battery indicator to guarantee the lock's security features are always operational. This is a critical step in any routine security maintenance plan.
• Maintain the Touchscreen: To ensure reliable operation, regularly clean the touchscreen with a microfibre cloth and an appropriate electronics cleaner to remove fingerprints and residue that could interfere with input.

3. Medeco Maxum Residential Double Cylinder Deadbolt

For situations demanding uncompromising mechanical security, the Medeco Maxum Residential Double Cylinder Deadbolt stands as a formidable choice. Esteemed by security professionals and specified in high-stakes environments, this lock prioritises physical resilience over digital convenience. Its primary feature is the double-cylinder design, which requires a key for operation from both the exterior and interior. This makes it one of the most secure locks for French doors, especially those with extensive glass panelling where an intruder might break the glass to reach an interior thumbturn.

This lock’s core strength lies in Medeco’s patented key control and high-security cylinder technology. Featuring hardened steel inserts to resist drilling and a pick-resistant pin tumbler mechanism, the Maxum is built to withstand aggressive physical attacks. Its restricted keyway system ensures that duplicate keys can only be created by authorised individuals through a verified Medeco dealer, providing a robust layer of administrative security. This is invaluable for corporate security officers and insolvency practitioners who must maintain strict control over who can access a property.

Key Benefits and Implementation Tips

The Medeco Maxum excels where key control is paramount and the risk of physical bypass is high. Its purely mechanical nature means it is immune to electronic hacking, power outages, or signal jamming, offering dependable security in any condition. The double-cylinder function is a critical deterrent against "reach-around" attacks.

To deploy this lock effectively and maintain its high-security rating, follow these professional recommendations:

• Establish an Emergency Key Protocol: Due to the double-cylinder design, always keep a spare key in a secure but easily accessible interior location (e.g., a nearby lockbox) for emergency egress. This is vital for safety.
• Verify Local Fire Regulations: Before installation, consult local fire codes. Some regulations restrict the use of double-cylinder deadbolts in certain residential or commercial settings due to egress concerns during an emergency.
• Enforce Strict Key Control: Leverage the Medeco system by ordering keys only from authorised dealers. Maintain a log of all issued keys to create a clear audit trail for sensitive properties.
• Prioritise Professional Installation: The precision engineering of a Medeco lock requires expert installation to function correctly and provide maximum resistance. Combine it with other physical deterrents, such as researching the benefits of an anti-snap door lock, to create a comprehensive security solution.
• Perform Regular Maintenance: Ensure the lock's smooth operation by lubricating the mechanism every six months with a high-quality graphite lubricant. This prevents binding and extends the life of the internal components.

4. August Smart Lock Pro + Connect

The August Smart Lock Pro + Connect offers a unique and highly practical solution for enhancing the security of French doors, particularly when preserving the original aesthetic of the door hardware is a priority. This innovative smart lock is designed as a retrofit device, installing directly over the interior thumbturn of an existing deadbolt. This means the exterior lock hardware remains completely unchanged, a crucial feature for listed buildings, rental properties with strict modification policies, or historic homes where maintaining the original look is paramount.

For professionals like insolvency practitioners or commercial property managers, this lock provides a significant advantage. It allows for the rapid deployment of a smart, auditable access system without needing a locksmith or permanent alterations to the property. Access can be controlled and monitored remotely via the August app, enabling agents to grant temporary entry to authorised personnel, track every lock and unlock event, and ensure the property is secured after a visit, all from a smartphone.

Key Benefits and Implementation Tips

The core strength of the August Smart Lock Pro is its seamless blend of traditional security with modern convenience. By keeping the original key as a backup, it provides a failsafe entry method, while the included Connect Wi-Fi Bridge enables powerful remote capabilities. This makes it one of the most versatile and secure locks for French doors where installation simplicity is key.

To get the most out of this system, consider these implementation strategies:

• Verify Deadbolt Compatibility: Before purchase, ensure the property’s existing deadbolt is on August's compatibility list. This simple check prevents installation issues and ensures smooth operation.
• Optimise Bridge Placement: Position the Connect Wi-Fi Bridge within 15 feet of the lock and in a location with a strong Wi-Fi signal. This guarantees reliable remote access and instant notifications.
• Leverage Auto-Lock and Auto-Unlock: Configure the geo-fencing feature for auto-unlock upon approach and set the auto-lock timer to secure the door automatically after entry or exit. This is invaluable for ensuring a property is never left unsecured by mistake.
• Utilise DoorSense™ Technology: Install the included DoorSense™ sensor. This small device confirms the door is physically shut before the lock engages, preventing a situation where the deadbolt is thrown while the door is ajar.
• Establish Tiered Digital Keys: Use the app to issue time-limited or recurring digital keys for contractors, staff, or enforcement agents, eliminating the security risk associated with physical key handovers and providing a clear digital audit trail of access.

5. Baldwin Estate Series Handleset with Smart Lock

The Baldwin Estate Series Handleset represents the pinnacle of luxury security hardware, merging exquisite, handcrafted aesthetics with state-of-the-art smart lock technology. Specified by architects and luxury home builders, this system is ideal for French doors on high-value residential or commercial properties where visual elegance is as crucial as robust security. Unlike standard locks, the Estate Series is a complete handleset system that often incorporates multi-point locking mechanisms, providing superior resistance to forced entry on both the active and inactive door leaves.

This premium solution is frequently deployed in executive office buildings with glass door installations and high-end hospitality suites featuring French doors, where maintaining a sophisticated ambiance is non-negotiable. For corporate security officers managing access to such locations, the integration of Baldwin Evolved smart technology provides advanced control. It allows for keyless entry via smartphone or keypad, remote access management, and detailed activity logs, ensuring that security measures enhance, rather than detract from, the property's prestige.

Key Benefits and Implementation Tips

The primary advantage of the Baldwin Estate Series is its no-compromise approach, offering one of the most visually impressive and physically secure locks for French doors available. The solid forged brass construction provides a formidable physical barrier, while the smart features offer modern convenience and control. Baldwin Evolved technology can be managed via the Kevo app, offering eKeys for timed, scheduled, or anytime access.

To properly leverage this high-end system for maximum security and longevity, consider the following advice:

• Choose Multi-Point Locking: For French doors, always specify a multi-point locking handleset. This secures the door at the top, bottom, and centre, drastically increasing its resistance to being prised open.
• Work with Certified Dealers: Consult a certified Baldwin dealer for proper specification. They can ensure the chosen hardware is correctly configured for your specific door thickness, backset, and handing, which is critical for a secure fit.
• Plan for Professional Installation: The precision required for installing a multi-point locking system demands professional expertise. Incorrect installation can compromise the lock's integrity and void the warranty.
• Match Architectural Style: Select a finish and style from Baldwin's extensive collection that complements the property's architectural design. This ensures security enhancements align with the building's aesthetic standards.
• Register for Support: Always register the products to activate the comprehensive warranty coverage. This also provides access to dedicated technical support for any operational or maintenance queries.

6. Mul-T-Lock Cronus Multi-Point French Door Lock System

The Mul-T-Lock Cronus system represents the pinnacle of mechanical security for French doors, offering a comprehensive solution that goes far beyond a standard deadbolt. Engineered specifically for double-door configurations, this multi-point locking mechanism secures the door at several critical points simultaneously, typically at the top, bottom, and centre. This transforms the entire door set into a unified, fortified barrier, making it exceptionally resistant to forced entry techniques like prying, kicking, or spreading the doors apart. Its robust design is a preferred choice for high-security applications where digital systems may not be suitable or desired.

This system is frequently specified by security consultants for protecting high-value assets and sensitive locations, such as government facilities, luxury residential properties, and commercial buildings with stringent security mandates. For corporate security officers, the Cronus system provides peace of mind that physical entry points are maximally hardened against sophisticated attack methods. Its reliability is rooted in superior mechanical engineering rather than electronics, ensuring consistent performance without reliance on power or connectivity.

To give you a quick reference of its primary security advantages, the infographic below summarises the core benefits of this system.

These features highlight how the Cronus system provides layered defence, from its physical locking points to its highly controlled key system, making it one of the most secure locks for French doors available.

Key Benefits and Implementation Tips

The real strength of the Mul-T-Lock Cronus is its integrated, high-security approach. The system uses Mul-T-Lock's patented key control technology, which severely restricts unauthorised key duplication and provides a clear chain of custody. This is particularly valuable for insolvency practitioners or property managers who must maintain absolute control over who can access a property during sensitive proceedings. It can also be integrated into a larger security framework, and you can explore how this fits with patented master key systems for comprehensive site management.

To ensure the system performs optimally, consider these expert recommendations:

• Prioritise Professional Installation: This is not a DIY product. A professional evaluation and installation by a certified Mul-T-Lock dealer is essential to ensure all components are correctly fitted and aligned for smooth, reliable operation.
• Verify Door and Frame Integrity: For the locking points to engage properly, the French doors and their frame must be perfectly aligned and structurally sound. Any warping or misalignment will compromise the system's effectiveness.
• Conduct Regular Maintenance: Lubricate all locking points, including bolts and shoot bolts, every six months with a recommended non-petroleum-based lubricant to prevent binding and ensure smooth operation.
• Train Authorised Users: Ensure all personnel with access understand the correct locking sequence. Proper operation is key to engaging all locking points and achieving maximum security.
• Schedule Annual Inspections: Have a professional locksmith perform an annual service to check for wear, test functionality, and make any necessary adjustments to maintain peak performance and security.

Secure Lock Features Comparison

Making the Final Choice: When to Call in the Professionals

Choosing from the diverse range of secure locks for French doors we’ve explored is a crucial step towards fortifying a property’s most elegant, yet often most vulnerable, access point. We’ve covered everything from advanced smart technology, like the Schlage Encode and Yale Assure Lock SL, to the sheer mechanical resilience of the Medeco Maxum deadbolt and the comprehensive protection of the Mul-T-Lock Cronus multi-point system. Each solution presents a formidable barrier against unauthorised entry, but their effectiveness is ultimately determined by a perfect match between the lock, the door, and the specific security demands of the environment.

The fundamental takeaway is that securing French doors is a nuanced task. It is not merely about selecting the most expensive or feature-rich lock. It's about a holistic security strategy. For instance, a high-tech smart lock offers unparalleled access control and audit trails, ideal for commercial properties or situations requiring remote management. In contrast, a robust, drill-resistant double-cylinder deadbolt provides straightforward, physical security that is less reliant on power or connectivity, a critical factor for certain high-risk scenarios.

Synthesising Your Security Strategy

To move forward, your next steps should involve a detailed assessment of your specific needs. Consider the following key questions:

• What is the primary threat? Are you guarding against opportunistic burglars, or do you require protection against more determined, sophisticated attacks like lock picking, bumping, or drilling? The answer will guide you towards either a high-security mechanical lock like the Medeco or a smart lock with tamper alerts.
• What level of access control is required? Do you need to issue temporary digital keys for contractors, track entry and exit times for compliance, or simply secure a single-family residence? The August Smart Lock Pro offers flexibility, while a traditional deadbolt provides simplicity.
• What are the physical characteristics of your doors? The material, alignment, and existing hardware of your French doors will dictate which locks are compatible. A multi-point system like the Mul-T-Lock, for example, requires specific door construction and is not a simple retrofit for all frames.

The Critical Role of Professional Installation

While some of the simpler smart locks are designed for straightforward DIY fitting, achieving true, insurance-compliant security with high-calibre hardware is not a task for amateurs. An improperly installed lock is a security flaw in itself. Misalignment can prevent deadbolts from fully engaging, incorrect screw choices can compromise structural integrity, and poorly fitted multi-point systems can fail under pressure. These small errors can completely negate the investment in a premium lock, creating a false sense of security that is more dangerous than having no lock at all.

This is where professional expertise becomes non-negotiable. Engaging a certified locksmith ensures that your chosen lock performs exactly as the manufacturer intended. They can correctly assess your doors, make necessary adjustments, and guarantee a flawless installation that maximises resistance to forced entry and meets stringent industry standards.

Your property's security is too important to leave to chance. By carefully evaluating your needs and entrusting the installation to seasoned professionals, you transform your elegant French doors from a potential vulnerability into a secure, reinforced asset.

For a professional assessment and flawless installation of the most secure locks for French doors, trust the experts with over two decades of specialised experience. Contact Specialised Locksmiths today to ensure your property is protected with precision, expertise, and the highest quality hardware available.