Access control systems regulate access to buildings and areas and can be divided into various types: from card- and transponder-based systems, through biometric solutions, to network- and cloud-based approaches. The choice depends on security requirements, scalability and integration options, with legally compliant planning being decisive.

Strategic planning for legally compliant, efficient access solutions

Choosing the right access control system is a complex decision that goes far beyond simply opening doors. It requires in-depth analysis of security needs, technological possibilities and the legal framework. This article examines the various types of access control systems and shows how independent planning paves the way to an optimal solution.

Key Takeaways

  • Choosing the right access control system requires a comprehensive requirements analysis that goes beyond simply opening doors and takes account of specific security requirements as well as future scalability.
  • Biometric systems offer the highest level of security but require strict compliance with the GDPR and a data protection impact assessment to be legally compliant.
  • Independent, manufacturer-neutral planning is decisive to avoid manufacturer dependency, optimise costs, and implement a future-proof, legally compliant solution that integrates seamlessly into existing security management systems.

However, the variety of available technologies and system architectures can be overwhelming. For decision-makers at medium-sized and large companies as well as public institutions, the question is which access control system types best meet the specific requirements for security, flexibility and cost-effectiveness. A well-founded decision requires not only technical understanding but also a strategic perspective, in order to ensure long-term investment security and legal compliance.

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Fundamentals of access control: more than just opening doors

Access control defines who is granted access to particular areas, when and where. Its primary aims are the protection of people, property and sensitive information, and the prevention of unauthorised access. While mechanical locking systems traditionally fulfilled this function, they are often inadequate in modern environments. They offer limited flexibility in granting rights, make logging difficult, and are costly when a key is lost or stolen. Electronic access control systems, by contrast, enable precise identification and authorisation of people, dynamic granting of rights, and complete logging of all access events.

A modern access control system typically consists of three core components: an identification medium (e.g. RFID chip, PIN code, biometric feature), a reader at the access point, and a control unit (controller) that checks permissions and grants or denies access. These systems can be standalone, offline, or networked online, which significantly influences their complexity and functionality. Choosing the right system type is decisive for the effectiveness of the overall security concept. It must take account of the company's specific risk profile, the number of access points, and the frequency of permission changes. A careful requirements analysis is therefore the first and most important step in planning a future-proof access control system.

Card- and transponder-based systems: focus on flexibility

Card- and transponder-based access control systems are among the most widespread electronic solutions. They use identification media such as RFID cards, key fobs, or mobile devices with NFC technology, which transmit stored access rights when brought close to a reader. These systems offer a high degree of flexibility in managing access rights. Permissions can be granted, changed or revoked centrally, without physical keys having to be exchanged. If a medium is lost, it can be blocked immediately, which significantly increases security and reduces costs.

Technologically, these systems are often based on standards such as MIFARE® (e.g. DESFire) or LEGIC® advant, which offer different security levels and feature sets. Choosing the right standard is decisive for the system's long-term security and compatibility. A key advantage of these systems lies in their scalability and the ability to integrate them into existing infrastructure. They are ideally suited to companies with large numbers of employees and many access points, such as office buildings, production facilities or educational institutions. Logging access events also enables complete traceability, which is highly important for internal audits and in the event of security incidents.

Biometric access control systems: maximum security through identification

Biometric access control systems use a person's unique physical or behavioural characteristics for identification and authentication. These include fingerprint, iris scan, facial recognition or hand vein pattern. Their main advantage lies in their high resistance to forgery and the fact that biometric characteristics cannot be lost, forgotten or passed on. This makes them ideal for high-security areas such as data centres, laboratories or vault rooms, where protecting sensitive data and assets is the top priority.

However, biometric systems are particularly sensitive from a data protection perspective. Under the General Data Protection Regulation (GDPR), biometric data is classed as a special category of personal data and requires heightened protection. Before implementation, a data protection impact assessment (DPIA) under Article 35 GDPR must be carried out, in order to identify risks and define suitable protective measures. In addition, use must be proportionate and may only take place if milder means cannot achieve the required security level. Integrating biometric systems therefore requires comprehensive planning that takes account not only of technical aspects but also of the legal and organisational framework. Combining biometrics with other identification media (e.g. biometrics and card) can further increase security while also supporting legally compliant use.

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Network-based and cloud-based access control: scalability and central management

Network-based access control systems enable central control and monitoring of all access points in real time. By connecting to the company network, permissions can take effect immediately and all events can be logged without gaps. These systems are particularly suitable for larger companies or locations with many doors and frequently changing permissions. Management takes place via central software, which often also integrates functions for time recording or personnel management.

Cloud-based access control systems go a step further by hosting the management software and data in the cloud. This offers advantages such as remote access, simplified servicing, and high scalability, ideal for companies with multiple locations or flexible working models. A 2025 report shows that wireless systems, which often form the basis for network- and cloud-based solutions, overtook wired solutions for the first time, underlining the trend toward digital and mobile access options. When planning such systems, IT security is of the greatest importance. Robust encryption mechanisms, secure authentication procedures, and regular security updates must be ensured, in order to protect data integrity and confidentiality. Selecting a provider with certified cloud services and demonstrable IT security standards (e.g. ISO/IEC 27001) is essential here.

Integration into higher-level security management systems

The true strength of modern access control systems often only unfolds through their integration into higher-level security management systems (GMS). A GMS centralises the monitoring and control of various security-relevant systems, such as fire alarm systems (BMA), intrusion detection systems (EMA), video surveillance and access control, in a single user interface. This link creates synergies that significantly improve responsiveness in an emergency and increase the efficiency of security management.

In the event of a fire alarm triggered by a BMA, the GMS can, for example, automatically unlock certain doors to release escape routes, while other doors remain locked to prevent the spread of danger. At the same time, video surveillance cameras can be panned to the affected area and the images transmitted to the security control centre. DIN VDE 0833, which sets general requirements for hazard warning systems, emphasises the importance of integration for critical infrastructure. Such comprehensive integration requires detailed planning that takes account of all interfaces and dependencies. PLANATEL® supports companies in developing tailored integration concepts that not only meet technical requirements but also optimise operational processes and raise security to a new level.

Planning and operating access control systems are inseparably linked to a wide range of legal requirements, particularly with regard to data protection and employee protection. Compliance with the General Data Protection Regulation (GDPR) is of central importance here, as access control systems frequently process personal data to enable identification and log access events. Strict requirements apply particularly to biometric systems, which process sensitive data, including the need for a data protection impact assessment (DPIA) and the principle of proportionality.

Alongside the GDPR, national laws such as the Federal Data Protection Act (BDSG) and employment-law provisions also play a role, particularly where employee monitoring is concerned. DIN VDE 0833, which sets general requirements for hazard warning systems, as well as specific VdS guidelines for access control systems (e.g. VdS 2358, VdS 2367), provide the technical framework for legally compliant planning and installation. Independent planning by experts such as PLANATEL® ensures that all relevant standards and guidelines are taken into account from the outset. This minimises legal risk, avoids costly rework, and builds trust among employees and external partners. Correct documentation of all processing procedures and transparent information for those affected are just as important here as the technical implementation of the security measures.

Common mistakes in selecting and planning access control systems

Selecting and planning an access control system is a complex undertaking in which mistakes are frequently made, which can lead in the long run to increased costs, security gaps or poor acceptance. A typical mistake is an inadequate requirements analysis. Without precisely capturing the access points to be secured, the number of users, the required security levels, and future growth plans, a system is often chosen that is either over-dimensioned and too expensive, or does not meet the actual requirements.

Another critical point is neglecting manufacturer neutrality. Committing too early to a particular manufacturer can lead to unwanted manufacturer dependency, which makes future extensions more difficult and weakens the negotiating position on maintenance contracts. In addition, integration options with other systems such as fire alarm systems or video surveillance are often overlooked, leaving valuable synergies unused. Aspects of legal compliance, particularly data protection for biometric systems, are also frequently underestimated, which can lead to legal problems. Failure to observe relevant standards such as DIN VDE 0833 or VdS guidelines can jeopardise the system's certifiability and lead to problems with insurers in the event of a claim. Independent planning that takes account of all these factors and adopts a holistic perspective is therefore essential to avoid such pitfalls and implement a future-proof solution.

The role of independent planning: your advantage with PLANATEL®

The complexity of modern access control systems and the variety of available types call for specialised, and above all independent, planning. This is where PLANATEL®'s expertise comes in. As a planning and consulting company, we have been established in the market since 1992, over 34 years, and operate 100% manufacturer-neutral and financially independent. Our goal is to develop the optimal solution for our customers, precisely tailored to their individual needs while meeting the highest standards of security, cost-effectiveness and legal compliance.

We begin every planning process with a detailed as-is survey and requirements analysis, to gain a clear understanding of your requirements. Building on this, we develop a target concept and detailed plan that takes account of all technical, organisational and legal aspects. This includes selecting the suitable access control system types, defining interfaces to other systems such as fire alarm systems, and producing legally compliant concepts. Through our manufacturer-neutral tendering and award process, we ensure you receive the best technology at the best price while avoiding unnecessary manufacturer dependency. We accompany you from conception through to acceptance and invoice review, to guarantee the quality and success of your project. With PLANATEL®, you invest in a future-proof, efficient access control solution that sustainably supports your security objectives.

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Next step

Contact us for a no-obligation initial consultation.

PLANATEL®: Independent planning and consulting since 1992
Tel: 040 / 23 73 02-30
E-Mail: info@planatel.de

Frequently asked questions

What advantages do card-based access control systems offer over mechanical keys?

Card-based systems offer significant advantages over mechanical keys. They enable central, flexible management of access rights, which can be adjusted at any time. If an identification medium is lost, it can be blocked immediately, without locks having to be replaced. These systems also log all access events completely, which increases traceability and improves security. Mechanical keys, by contrast, are prone to loss, theft and uncontrolled sharing, which carries high costs and security risks.

What does "security management system" mean in the context of access control?

A security management system (GMS) integrates various security systems, such as access control, fire alarm systems, intrusion detection systems and video surveillance, into a central platform. This enables a coordinated response to security incidents. For example, in the event of a fire alarm, access control can automatically release escape routes while simultaneously panning cameras to the affected area. A GMS optimises processes in an emergency, improves overview, and increases overall security through the intelligent linking of individual components.

Which DIN standards are relevant to planning access control systems?

Several DIN standards are relevant to planning access control systems. DIN VDE 0833 sets general requirements for hazard warning systems, which also includes access control systems. More specifically, the DIN EN 50133 series of standards (access control systems for security applications) and VdS guidelines such as VdS 2358 (requirements) and VdS 2367 (planning and installation) apply. These standards and guidelines guarantee the technical quality, functionality and legally compliant implementation of the systems.

How does the GDPR affect the implementation of biometric access control systems?

The GDPR has a significant impact on biometric access control systems, as biometric data is classed as particularly sensitive personal data. Its processing is generally prohibited unless strict exemptions apply. Companies must carry out a mandatory data protection impact assessment (DPIA) and observe the principle of proportionality. This means biometric systems may only be used where milder means cannot achieve the security objective and where the consent of those affected has been given, or another legal basis applies.

What cost factors must be considered when planning an access control system?

The cost of an access control system comprises various factors. These include hardware costs (readers, controllers, identification media), software licences for central management, installation costs (including electrical work and cabling), and ongoing operating and servicing costs. Biometric solutions are generally more expensive than card-based systems. A detailed cost breakdown and a life-cycle cost assessment are essential for sound budget planning.

What is the difference between online and offline access control systems?

Online systems are permanently connected to a central network, enabling real-time management of permissions and complete logging. Offline systems operate autonomously; permissions are stored directly on the identification medium or in the reader and updated less frequently. They are ideal for individual doors or smaller areas without permanent network infrastructure.

What role do VdS guidelines play for access control systems?

VdS guidelines, such as VdS 2358 and VdS 2367, supplement the DIN standards and provide practice-oriented detailed requirements for access control systems. Although they are generally voluntary, they are frequently used by insurers as a basis for assessment and are highly important for the system's certifiability.

Are biometric access control systems always the safest choice?

Biometric systems offer a very high level of security, as characteristics cannot be lost or passed on. However, their implementation is complex from a data protection perspective and requires a strict proportionality assessment under the GDPR. They are primarily justified for high-security areas where milder means are not sufficient.

How can manufacturer dependency be avoided with access control systems?

Manufacturer dependency can be avoided through independent planning and tendering. A detailed requirements analysis and the creation of manufacturer-neutral specifications of services make it possible to compare different providers and choose the best solution without being tied to a single manufacturer. This secures flexibility and cost control.

Sources and further information

  • assaabloy.de
  • lupus-electronics.de
  • mobatime.ch
  • stadtritter.de