Retrofitting Door Locks with a Secure Numerical Code

by | 11. August 2025 | Technology

Retrofitting door locks with a keypad lock is an innovative solution for improved security and user-friendliness. Code keypads enable access without traditional keys. This simplifies administration and increases security. It’s of particular advantage for places with a great deal of foot traffic, such as hotels, office buildings or public buildings. 

Target groups and use cases for PIN code keypads 

Using door locks with a keypad lock enables solutions to be tailored to a great variety of sectors and their specific requirements. Key users of doors with numerical locks, and key use cases include:  

  • Facility managers in large rental buildings: Whether it’s cleaning, maintenance or other everyday tasks – numerical locks simplify access administration and control. Particularly when external companies are involved or many different units are to be managed, e.g. in larger residential complexes, locks with numerical codes make things so much easier. 
  • Providers of Airbnb accommodation and hotels: For these providers, the option of giving guests easy and secure access without the need for handing over a physical key is a great advantage. 
  • Security officers in companies: In company buildings, using code locks can increase security and efficiently control access. So, security officers in companies often choose to retrofit door locks with a numerical code. 
  • Security in industrial facilities: Industrial enterprises must safeguard their factory grounds reliably. Strict security requirements and the need for efficient access control make electronic numerical locks an ideal solution. 
  • Access control in private offices and public buildings: Access control systems in private and public office buildings increase security and enable efficient monitoring of visitor influxes. 
  • Flexible access regulations in healthcare facilities: Flexible locking systems in healthcare facilities are essential in guaranteeing the protection of sensitive areas and, at the same time, fulfilling the requirement for quick access by medical staff. 

 Types of door locks with a numerical code 

Door locks with a numerical code vary, depending on usage requirements and technology. Each type offers specific advantages for certain use cases and requirements – from high security, right through to flexible and easy handling. 

 These are the most common types: 

 

  • Wireless code lock: These locks communicate with other security systems in the building via wireless, and enable central control of entrances. 
  • Standalone code lock: Ideal for individual doors, for which connection to a central system is not required. These locks function completely independently and are installed directly at the door. 
  • Smart lock: The cutting-edge option, enabling control via smartphone apps and often offering additional features, such as access logging or remote access. 

Functions and features 

Retrofitting a door lock with a keypad lock not only improves security and user-friendliness, but also adds to the range of functions offered. These locks can be integrated into existing security systems and smart home solutions, making extensive control and monitoring possible. The latest locks include advanced networking capabilities and improved encryption methods for safeguarding data transmission. 

Key functions include:  

  • Emergency opening: Many models have an emergency opening function that enables the lock to be opened manually in the event of a power failure or technical defect. 
  • App control: With an appropriate app, users can unlock and lock doors, as well as monitor access, from anywhere. 
  • Access logging: This function records who opened the door when, which is particularly useful in business or rental environments.  

PIN code keypads: advantages and disadvantages 

 Retrofitting a door lock with a numerical code offers numerous advantages, but also certain disadvantages. It’s essential for people wanting to optimise the security of their building with state-of-the-art access control systems to consider the following points: 

Advantages  

Increased security 

A higher level of security is achieved with codes that can be individually set and the option of integration into monitoring systems.  

No more physical keys 

Key loss and the risk of keys being copied become things of the past – an advantage in large complexes with many users.  

Simplified access control 

Access authorisations can be assigned and managed more flexibly, as well as modified faster, without the need to change physical locks.  

Disadvantages  

Higher initial costs 

Purchase and installation of these technologically advanced systems may be much more costly than installing traditional locking systems.  

Technical vulnerabilities 

Electronic systems may be susceptible to technical malfunctions, such as software errors or hardware failures.  

Security risks from weak codes 

If those responsible choose simple or frequently used codes, this may undermine the security of the system. 

Combination options and system integration  

Modernising existing door-locking systems by retrofitting numerical code systems is a flexible and secure solution. One example is the SmartHandles from SimonsVoss, which also offer mechanical “over-locking”. This means that they can be operated with both a physical key and a digital code, offering high security, but also allowing great flexibility.  

Compatibility of SimonsVoss PIN code keypads:  

  • Old PIN code keypads: These aren’t compatible with the Digital Cylinder AX and offer basic functions for older systems. 
  • New PIN code keypads (AX): Developed for use with the Digital Cylinder AX, these state-of-the-art keypads offer improved reach and additional security features. 

 

Digital functionality can be added to existing infrastructure using systems of this kind. This makes the transition to state-of-the-art security systems easier, and is ideal for the gradual implementation of new technologies. 

 

Decision support: criteria for choosing the right lock 

To choose the right electronic numerical lock, certain factors should be considered. These will ensure that the product corresponds to the specific requirements. 

 

Selection criteria:  

  • Door thickness: Door thickness and material may dictate what type of lock can be installed. 
  • Required level of security: The level of security of the lock should be selected in line with the sensitivity of the data or values to be protected. 
  • Budget: The costs for the different locking systems vary, so a budget should be defined that considers the purchase and possible maintenance costs. 

 

Finding a partner and installer 

Retrofitting a door opener with a numerical code is a cost-effective solution that offers long-term advantages. If you’d like to retrofit a SimonsVoss door lock with a keypad lock, contact one of our team members. The professionals at our partner companies have the necessary experience in installing and maintaining electronic locking systems. They will also give you advice on choosing the right system and support with integration into your existing security infrastructure, if you so wish.  

You’d like to learn more about state-of-the-art, keyless access solutions with a pincode? Then read our page about the SimonsVoss pincode keypads now. 

 

Learn more about PIN code keypads!