Fill in the form and our specialists will help design a secure, scalable master key system tailored to your site.
✔ Free consultation
✔ Scalable solutions
✔ For commercial and industrial sites
✔Range of patented key profiles
A master key system is a structured locking solution that allows different keys to open different doors, while a master key can open multiple or all doors within a building. It’s a proven way to control access across offices, schools, healthcare sites, and commercial buildings without the complexity of managing large numbers of individual keys.
By creating a clear key hierarchy, master key systems improve security, simplify day-to-day access, and reduce the costs associated with lost keys and rekeying. Authorised staff can access the areas they need, while sensitive or restricted spaces remain protected.
At DOM UK, we design and supply bespoke mechanical master key systems using high-quality security cylinders tailored to your site, risk level, and operational requirements. Whether you’re securing a single building or a multi-site estate, our scalable solutions are built to grow with you, supported by an experienced UK partner network to ensure correct design, installation, and long-term key control.
I wanted to thank Emma Chapman and the team for all their help, particularly with large commercial projects over the last few years, couldn’t have done this without you and the range of product that DOM supply.
Roland Golby - Director - A1 Seecure Locksmiths
Thank you for your great service on our recent order. Everything was correct, cylinders all labeled up and fast delivery time.
Its a shame other companies aren't as efficient as DOM!
A master key system simplifies building management by allowing owners or facility managers to access multiple areas with a single key. This removes the need to carry large key bunches and makes day-to-day access quicker and more practical across your premises.
Master key systems offer precise access control through clearly defined key hierarchies. Individual keys can be assigned to specific doors or zones, while authorised personnel retain master-level access. This ensures staff only access the areas they need, without compromising overall security.
DOM UK supplies high-security mechanical cylinders with controlled key profiles. Keys can only be duplicated through authorised DOM dealers, helping to prevent unauthorised copying and maintain long-term control of your system.
When keys are lost or staff change, replacements can be issued quickly without the need to replace entire locking systems. This keeps ongoing maintenance costs low while preserving security across the site.
A professionally designed master key system supports smooth daily operations by reducing delays, simplifying access, and maintaining security. For organisations managing multiple doors or buildings, this results in a more efficient, organised, and secure working environment.
Master key systems are widely used in schools, healthcare facilities, offices, and multi-site commercial estates where security and access control must work together.
A master key system is ideal for small to medium-sized buildings where access needs to be controlled across multiple doors while remaining simple to manage. This type of system allows one master key to open all locks, while individual sub-keys are restricted to specific doors or areas.
For example, a managing director, facilities manager, or site supervisor may hold the master key, granting full access across the building. Staff or contractors are issued keys that only operate the doors relevant to their role, such as offices, storage areas, or plant rooms.
DOM UK master key systems are fully bespoke and can be built around any of our high-security mechanical cylinders. Each system is designed to match your building layout, access requirements, and future expansion plans. Whether you’re securing offices, commercial premises, or light industrial sites, a single-level master key system delivers:
Clear access control and accountability
Reduced key quantities and simplified key management
High security using patented DOM cylinder technology
This structure provides an effective balance between security, convenience, and control, making it one of the most commonly specified master key solutions for commercial environments.
For larger estates or more complex access requirements, additional master key hierarchies can be introduced.
A Grand Master Key (GMK) System is designed for large organisations that require a well-structured access control solution. This advanced hierarchy provides top-level access for senior management, while offering tiered access to other departments and employees based on their roles.
A typical GMK System includes three levels:
Level 1 – Grand Master Key (GMK): Unlocks all cylinders across all sites, providing complete access for top-level management.
Level 2 – Master Key (MK): Unlocks all cylinders within a specific building or site, typically used by department heads or managers.
Level 3 – Sub-Master Key (SMK): Unlocks specific areas or departments, ensuring restricted access for staff and teams.
In addition to these levels, each cylinder comes with a unique key for individual access, ensuring a secure and controlled environment. DOM UK’s Grand Master Key Systems offer flexibility and security for large facilities, streamlining management while maintaining robust control over who can access each area.
Common Entrance Systems are ideal for multi-unit buildings such as apartment complexes or halls of residence, where individuals need access to shared entry points without gaining access to private units. These systems provide secure entry keys specifically for main entry doors, ensuring residents and staff can access common areas without compromising the privacy of individual units.
This system is particularly useful for maintenance staff, delivery companies, and other service personnel who require access to shared spaces such as hallways and lobbies. In addition, Common Entrance cylinders can be seamlessly integrated into a larger Master Key System, offering an added layer of convenience and control for building managers.
A Keyed to Differ (KTD) cylinder is designed to be operated exclusively by its unique key, offering individual security for each lock. While each cylinder remains secure, access can also be granted through relevant master keys within the system, allowing for flexible and controlled access across multiple areas. This setup is perfect for scenarios where individual security is paramount, while still maintaining the convenience and structure of a broader Master Key System.
Keyed Alike (KA) cylinders allow multiple locks to be operated by the same key, streamlining access management and enhancing convenience. Ideal for systems where several locks need to be opened with a single key, KA cylinders can be incorporated alongside master keys to create a tailored access solution. This flexibility ensures that users can efficiently manage access to different areas while maintaining the control and security provided by a Master Key System.
Fill in the form and our specialists will help design a secure, scalable master key system tailored to your site.
✔ Free consultation
✔ Scalable solutions
✔ For commercial and industrial sites
✔Range of patented key profiles
Designing a Master Key System involves careful planning and consideration of various factors to ensure it meets the unique security needs of your premises. At DOM UK, our Master Keying department offers expert support to help design tailored and efficient solutions for projects of all sizes.
For easy and efficient planning, we provide DOMXL, a free and user-friendly design tool available to all DOM dealers. Compatible with Microsoft Excel, DOMXL enables the creation of both simple and complex Master Key charts. Developed in-house, DOMXL provides building owners with valuable insights into cost efficiency and offers a solid foundation for planning and implementing Master Key Systems.
Key Features of DOMXL include:
Relationship Management: Streamlined control of profiles, design, type, and lock length.
Locking Function Control: Customisable locking functions to suit diverse security needs.
Comprehensive Cost Overview: A detailed view of costs, including gross pricing, for informed decision-making.
Hardware Import Compatibility: Integrates seamlessly with existing hardware for easy planning.
Extensions to Existing Master Key Plans: Effortlessly extend or modify your current Master Key System to accommodate future requirements.
