Commercial key control
Master Key Systems
For offices, managed buildings and commercial premises, a master key system can help organise who has physical key access to different doors without turning every door into a separate key problem.
Access planning
A good master key system starts with a clear access plan.
Businesses usually need master key advice when too many keys are circulating, staff roles change, communal doors need control or a building needs simpler administration. We help clarify the door groups and access levels before hardware is changed.
Controlled structure
Master keying is about physical key hierarchy.
A system may include individual keys, sub-master keys and a master key, depending on the building and the people who need authorised access.
We do not claim absolute key control. The practical level of restriction depends on the system, key profile and administration process selected.
The safest key system is the one everyone authorised can understand and manage.
Use cases
Where master key systems can help.
These requests are usually commercial or managed-property problems.
Office suites
Teams need access to some areas but not every room.
Communal doors
Shared doors need practical authorised access.
Facilities teams
Maintenance access needs to be controlled and documented.
Managed blocks
Key plans need to support residents, staff and contractors.
Restricted areas
Some rooms should remain limited to specific users.
System refresh
Old key systems need reviewing after years of changes.
Process
How a master key system is planned.
- Map
List doors and users
We identify the doors, user groups and access requirements.
- Group
Define access levels
Doors are grouped into a practical key hierarchy.
- Check
Assess lock hardware
Existing cylinders and locks are checked for compatibility.
- Explain
Confirm limitations
You understand what the selected system can and cannot control.
- Install
Fit agreed hardware
Approved cylinders or locks are fitted and labelled appropriately.
- Handover
Support administration
Keys and access levels are explained for day-to-day management.
Related services
Connected services for replacement decisions.
These pages help when replacement overlaps with repair, fitting or urgent securing.
All Locksmith Services
Return to the Services Hub to compare the right route.
CommercialCommercial Locksmiths
For broader business locksmith support.
OfficeCommercial Locksmiths
For staff changes, lost keys and office re-keying, covered as part of our commercial locksmith service.
ReplaceLock Replacement
For replacing unsuitable or outdated locks.
UpgradeLock Upgrades
For improving lock specification.
Areas
Lock replacement across London, Essex and selected Kent areas.
These service pages are site-wide. Use the regional pages to understand current coverage for your address.
Questions customers ask
Master key system FAQs.
Useful answers for businesses planning physical key access.
What is a master key system?
It is a planned physical key hierarchy where different keys can open different agreed groups of doors.
Is master keying only for large buildings?
No. It can help smaller offices or managed premises if there are multiple doors and user groups.
Can every existing lock be master keyed?
Not always. The existing cylinders, lock type and required key profile need checking.
Can you guarantee keys cannot be copied?
No blanket guarantee should be made. Restriction depends on the system and how keys are administered.
Can master key systems be expanded later?
Often they can be planned with future expansion in mind, but this needs to be considered from the start.
Do you support offices and managed buildings?
Yes, this service is intended for commercial and managed premises.
Is this the same as access control?
No. This page is about mechanical key systems, not electronic access control.
Can old key systems be reviewed?
Yes. Older systems can be assessed if keys, cylinders or access levels have become unclear.
Will all doors need changing?
That depends on compatibility and the access plan. We assess before recommending hardware changes.
Who should manage the key list?
The business or building manager should keep a clear internal record of issued keys and authorised users.
Replace with care
Need Better Key Control?
Tell us how many doors you manage and which user groups need access.