A Guide to Keypad, Key Fob, Card and Mobile Access for UK Businesses

Modern businesses need to control who can enter their premises, when they can enter and which areas they can access. Traditional locks and keys provide very limited control and create security risks if keys are lost, copied or not returned when staff leave.

Electronic office access control systems allow organisations to manage building access securely while simplifying day-to-day operations.

This guide explains the four main access control technologies used in UK offices and how businesses can choose the most suitable system.

What Is an Access Control System?

An access control system is an electronic security system that restricts entry to a building or specific areas within it.

Instead of physical keys, authorised users gain access using electronic or digital credentials.

Common access credentials include:

• PIN codes
• RFID key fobs
• Access cards
• Smartphone credentials

A typical access control installation includes:

• Door readers or keypads
• Electronic locking hardware (magnetic locks or electric strikes)
• Access control panel or controller
• Access management software

These systems allow businesses to:

• Restrict entry to authorised personnel
• Control access to sensitive areas
• Remove access immediately if staff leave
• Monitor entry activity through audit logs
• Integrate with CCTV, intruder alarms and fire systems

For many organisations, access control forms a core part of modern office security infrastructure.

Key Types of Office Access Control Systems

Different access technologies suit different operational environments. The most common options for UK businesses are keypad systems, key fobs, access cards and mobile credentials.

Keypad Access Control Systems

How it works

Keypad systems allow entry by entering a PIN code on a keypad installed beside the door.

When the correct code is entered, the system releases the door lock and allows entry.

Advantages

• Low installation cost
• No physical credentials required
• Quick installation
• Simple to operate

Limitations

• PIN codes can be shared between users
• Codes must be updated regularly
• Limited individual user tracking

Suitable applications

Keypad systems are commonly used for:

• Small offices
• Staff-only areas
• Internal office doors
• Storage rooms or restricted areas

They are typically used in low to moderate security environments.

Key Fob Access Control Systems

How it works

Key fob systems use RFID or proximity technology. Users present a small electronic fob to a reader mounted near the door.

If the credential is authorised, the system unlocks the door.

Advantages

• Quick and convenient access
• Each fob is individually assigned to a user
• Lost fobs can be disabled immediately
• Access permissions can be managed centrally

Limitations

• Fobs can be lost
• Replacement credentials must be issued

Suitable applications

Key fob systems are widely used in:

• Office buildings
• Shared commercial premises
• Staff entrances
• Multi-tenant buildings

They are one of the most common access control solutions for businesses.

Access Card Systems

How it works

Access card systems operate similarly to fobs but use contactless access cards instead.

Cards are presented to the reader to unlock the door.

Advantages

• Convenient for staff carrying ID badges
• Suitable for organisations with many users
• Can integrate with staff identification systems
• Simple to issue and manage

Limitations

• Cards can be misplaced
• Cards may be shared if policies are not enforced

Suitable applications

Access cards are commonly used in:

• Corporate offices
• Larger commercial premises
• Government or educational facilities
• Businesses that use staff ID passes

Mobile Access Control Systems

How it works

Mobile access control systems allow staff to unlock doors using smartphone credentials.

Doors are unlocked using technologies such as:

• Bluetooth
• Near Field Communication (NFC)
• Secure mobile apps

Advantages

• No physical credentials required
• Access can be granted or removed remotely
• Suitable for flexible and hybrid workplaces
• Reduced risk of lost credentials

Limitations

• Requires compatible access control hardware
• Staff must have smartphones

Suitable applications

Mobile access systems are increasingly used in:

• Modern office environments
• Flexible workspaces
• Technology companies
• Buildings with remote management requirements

Choosing the Right Access Control System for Your Office

Selecting the most suitable access control system depends on several factors.

Number of users

Larger organisations require systems capable of managing large user databases and multiple access levels.

Security requirements

Higher risk areas may require multi-factor authentication, such as a card combined with a PIN.

Building layout

Businesses often require different access permissions for different areas, such as:

• Staff entrances
• Management offices
• Server rooms
• Storage areas

Integration with other systems

Modern systems can integrate with:

• CCTV systems
• Intruder alarms
• Fire alarm systems
• Time and attendance systems

Integration improves overall security management and monitoring.

IT Infrastructure

Cloud-based access control systems require reliable network connectivity and appropriate cybersecurity policies.

Benefits of Access Control Systems for Businesses

Access control systems provide several operational and security benefits.

Improved building security

Only authorised users can access restricted areas.

Immediate access management

Access rights can be changed instantly if staff roles change or employees leave.

Access activity monitoring

Many systems record who accessed doors and when, providing an audit trail.

Reduced reliance on keys

Businesses no longer need to manage large numbers of physical keys.

Flexible access permissions

Different access levels can be assigned depending on job roles.

Professional Access Control Installation

A professionally designed access control system ensures:

• Appropriate door hardware and locking mechanisms
• Reliable access management software
• Compliance with relevant fire and safety regulations
• Integration with existing security infrastructure

An experienced installer such as Sygma can also advise on system scalability, allowing additional doors or users to be added as the business grows.

Access Control Installation for UK Businesses

Choosing the right access control system is only part of the process. Correct system design, installation and configuration are essential to ensure reliable performance and compliance with relevant security and fire safety standards.

Sygma Fire, Security & Electrical designs and installs commercial access control and keyless door entry systems for offices, warehouses and commercial buildings across the UK.

Sygma engineers can provide:

• Access control system design
• Keypad, fob and card entry systems
• Mobile and cloud-based access control
• Multi-door and multi-site access management
• Integration with CCTV and intruder alarms

Sygma specialises in integrated commercial security systems, including CCTV, intruder alarms, access control and perimeter protection for businesses of all sizes.