Commercial Key Cabinet Sizes UK: How Many Keys Do You Need to Store?

Choosing a commercial key cabinet is not simply a matter of counting the keys you have today. The right capacity depends on how many individual keys, bunches and electronic fobs you need to store, how much spare capacity you require and how much physical space those items occupy inside the cabinet.

A site with 80 small flat keys may fit comfortably into a 100-position cabinet. Another site with 80 vehicle keys, bulky fobs and multi-key bunches may need a substantially larger or deeper cabinet.

Total Locker Service supplies commercial key cabinets ranging from compact units for smaller workplaces through to high-capacity models with up to 600 key positions. Browse our range of secure key cabinets when you are ready to compare suitable capacities and cabinet types.

Quick Answer: What Size Key Cabinet Do I Need?

Count every key, spare, bunch and fob that needs a permanent position, then allow additional capacity for future growth.

Keys currently managed	Typical cabinet capacity to consider	Typical application
Up to 20	20–30 positions	Small office, shop, reception or workshop
20–40	50 positions	Small workplace or department
40–80	100 positions	School office, maintenance team or medium workplace
80–160	200 positions	Larger facilities or estates department
160–320	400 positions	Large estates, property or fleet operation
320–500+	600 positions	Large multi-department or high-volume key estate

These figures are a starting point rather than a guarantee of physical fit. Large vehicle keys, electronic fobs and bunches can require considerably more space than individual flat keys.

For current commercial options from compact storage through to 600-position models, see our secure key cabinets.

Key Cabinet Capacity Is Not the Same as Usable Space

Key cabinets are normally described by the number of key hooks or positions they provide. A 100-key cabinet therefore provides positions intended to organise approximately 100 individual keys under suitable conditions.

But hook capacity does not tell you how much physical volume is available around those hooks.

The usable capacity can be affected by:

• the length of each key;
• the size of key tags;
• vehicle remote controls;
• electronic access fobs;
• multi-key bunches;
• large master keys;
• security seals or loops;
• hook spacing;
• cabinet depth;
• and the arrangement of internal hook bars or panels.

This is why an organisation storing 100 individual office keys and an organisation storing 100 vehicle key sets should not automatically specify the same cabinet.

20-Key Cabinets: Small Commercial Requirements

A cabinet in the region of 20 key positions can suit a small commercial site where only a limited number of controlled keys need central storage.

Typical applications include:

• small offices;
• shops and retail units;
• reception areas;
• small workshops;
• individual departments;
• cleaning cupboards;
• small community premises;
• and a limited collection of spare keys.

If you already have close to 20 keys, however, a nominal 20-key cabinet may be too small from the day it is installed.

Allow for duplicate keys, newly installed doors, cupboards, lockers or equipment. Moving to the next capacity band may provide a more usable long-term solution.

50-Key Cabinets: Small Workplaces and Departments

A 50-key cabinet is a useful capacity for organisations that have outgrown a small key box but do not yet need a large facilities-management cabinet.

It may suit:

• small workplaces;
• school administrative areas;
• maintenance departments;
• small care settings;
• local offices;
• retail premises;
• and individual departments within a larger organisation.

If the current estate contains 35 to 40 keys, a 50-position cabinet may provide some growth capacity. If the organisation is expanding rapidly, however, moving directly to approximately 100 positions may avoid an early replacement.

100-Key Cabinets: Medium Commercial Key Estates

Around 100 positions is a common commercial capacity because it can accommodate a meaningful key estate without moving into the largest cabinet formats.

Typical users include:

• schools;
• medium-sized workplaces;
• maintenance teams;
• warehouses;
• property managers;
• care facilities;
• hotels;
• and smaller vehicle fleets.

Before selecting a 100-key model, determine whether the requirement really consists of 100 individual keys.

If many positions will contain vehicle fobs or several keys on one ring, look at cabinet depth and hook spacing as carefully as the stated capacity.

200-Key Cabinets: Facilities and Estates Teams

Once an organisation is managing approximately 100 or more active keys, the cabinet becomes part of the facilities-management infrastructure rather than simply a secure box on a wall.

A cabinet around 200 positions can suit:

• larger schools;
• facilities departments;
• industrial sites;
• warehouses and distribution centres;
• property-management businesses;
• larger offices;
• healthcare environments;
• and modest fleet operations.

At this scale, organisation becomes increasingly important. Key positions should be numbered and linked to an index or key register so staff can identify missing keys without searching the cabinet manually.

A 200-position cabinet should also be assessed for its internal layout. Filling every hook with a bulky tagged bunch may make the cabinet difficult to use even though the nominal hook count is sufficient.

400-Key Cabinets: Large Key Estates

A requirement approaching 400 key positions usually indicates a substantial estate.

Applications can include:

• large educational sites;
• property and facilities-management organisations;
• vehicle fleets;
• large industrial premises;
• multi-building sites;
• hotels and accommodation estates;
• large maintenance operations;
• and centralised key stores.

At this level it becomes particularly important to decide whether one large cabinet or several smaller cabinets provides the better operating arrangement.

A single large cabinet centralises control. Several cabinets can allow keys to be separated by building, department, risk or function.

The correct choice depends on how the organisation issues and returns keys rather than capacity alone.

600-Key Cabinets: High-Capacity Commercial Key Storage

Commercial key cabinet ranges can extend to approximately 600 key positions, providing central storage for very large key estates.

A 600-position cabinet may be relevant for:

• large facilities and estates teams;
• multi-building organisations;
• large property portfolios;
• vehicle operations;
• industrial estates;
• large educational campuses;
• and central key-control rooms.

High-capacity cabinets should not be selected purely because they provide the greatest number of hooks.

Consider how staff will locate, issue and return several hundred keys. Clear numbering, indexing and separation by function become increasingly important as capacity rises.

For commercial options extending to high-capacity models, browse our range of secure key cabinets.

How Much Spare Key Cabinet Capacity Should You Allow?

A key cabinet that is completely full on installation has no practical growth capacity.

As a general planning starting point, allowing approximately 20–30% spare capacity can provide room for future additions.

For example:

Current requirement	20% allowance	30% allowance	Capacity to consider
20 keys	24	26	Approximately 30+
40 keys	48	52	Approximately 50–60+
75 keys	90	98	Approximately 100
150 keys	180	195	Approximately 200
300 keys	360	390	Approximately 400
450 keys	540	585	Approximately 600

This is not a rigid rule. A stable site with little prospect of expansion may require less reserve, while a growing organisation may benefit from substantially more.

Why Buying a Cabinet to Exactly Match Today’s Key Count Can Be a Mistake

Key estates rarely remain completely static.

Capacity can increase when an organisation adds:

• new offices;
• doors and access points;
• lockers;
• cupboards;
• plant rooms;
• vehicles;
• equipment;
• contractor keys;
• spare keys;
• and replacement or duplicate keys.

If a 100-position cabinet starts with 98 occupied hooks, even a modest site change may create an immediate capacity problem.

The result is often keys being doubled onto hooks, stored loose inside the cabinet or kept somewhere else entirely. That undermines the reason for installing an organised key cabinet.

Individual Keys Versus Key Bunches

One of the most common errors when selecting a key cabinet is counting bunches as though they occupy the same space as individual keys.

A small flat key hanging vertically occupies relatively little room.

A bunch containing:

• five or six keys;
• a large identification tag;
• a security fob;
• and a substantial key ring

can occupy several times as much internal volume.

If bunches make up a significant proportion of the requirement, consider a deep key cabinet or a cabinet whose internal hook arrangement can accommodate greater spacing.

Vehicle Keys and Electronic Fobs Need More Space

Vehicle keys are another situation where hook count alone can be misleading.

Modern vehicle keys can include:

• remote-control bodies;
• electronic transponders;
• large plastic housings;
• fleet identification tags;
• fuel cards;
• and several associated keys on one ring.

These may protrude considerably further from the back of the cabinet than ordinary door keys.

For fleet, garage, dealership or vehicle-management applications, check:

• internal cabinet depth;
• clearance between hook rows;
• clearance between keys and the door;
• and whether bunches overlap when the cabinet is fully populated.

A deeper 100-position cabinet may be more suitable than a shallow cabinet with a nominally greater hook capacity.

Why Cabinet Depth Matters

Width and height determine how many hook positions can be distributed across the cabinet. Depth determines what can hang from those hooks without interfering with the cabinet door or neighbouring keys.

Standard-depth cabinets can be suitable for individual flat keys and ordinary tags.

Deeper cabinets are worth considering for:

• vehicle keys;
• remote-control fobs;
• large bunches;
• long keys;
• oversized key tags;
• and mixed collections containing both individual keys and bunches.

Total Locker Service’s commercial range includes standard and deep key-storage options. Compare them through our secure key cabinets category.

When Does a Double-Door Key Cabinet Make Sense?

Very high-capacity key cabinets often become wider as additional hooks and internal panels are added.

Double-door cabinets can provide a practical format for large capacities because each door requires less swing space than one very wide door.

They can be useful where:

• 400 or 600 key positions are required;
• the cabinet contains several internal key panels;
• wall space is available but the surrounding room limits door swing;
• or the key estate needs a large central storage point.

Check the external width and required opening clearance before fixing a large cabinet to the wall.

One Large Key Cabinet or Several Smaller Cabinets?

A requirement for 400 keys does not automatically mean that one 400-position cabinet is the correct answer.

Compare two approaches.

Approach	Advantages	Considerations
One large cabinet	Centralised storage, one controlled location, easier overall inventory	Many users may need access to the same cabinet
Several smaller cabinets	Can separate keys by department, building, risk or user group	Requires several storage points and access arrangements

For example, a school could separate premises keys from classroom and departmental keys. A large business could separate vehicle keys from building keys. A facilities organisation could divide keys by site.

Capacity should therefore follow the way the organisation actually manages access.

Should Spare and Duplicate Keys Be Included in the Capacity Count?

Yes, if they are going to be stored in the cabinet.

A site may manage 80 locks but require substantially more than 80 storage positions if it holds duplicate or spare keys centrally.

Count:

• active user keys held centrally;
• spare keys;
• duplicate keys;
• master keys;
• contractor or service keys;
• vehicle spares;
• and infrequently used keys retained for emergency access.

Do not base cabinet capacity solely on the number of doors, vehicles or assets.

Allowing for Growth in Schools

Schools can accumulate keys gradually as buildings change and additional storage, classrooms, gates and specialist areas are added.

A capacity assessment should include:

• classroom keys;
• external doors;
• gates;
• maintenance areas;
• plant rooms;
• equipment stores;
• offices;
• locker keys;
• master keys;
• and controlled spare keys.

If an estate is expected to expand or undergo refurbishment, include those likely additions before selecting the cabinet.

Key Cabinet Capacity for Facilities and Estates Teams

Facilities teams frequently manage keys from several different operational categories.

For example:

• building access;
• plant and electrical rooms;
• stores;
• workshops;
• lockers;
• roof access;
• equipment;
• contractor access;
• vehicles;
• and emergency or restricted areas.

A useful capacity exercise separates these categories before adding them together.

This may show that one very large cabinet is appropriate, or that different key groups should have different security and access arrangements.

Key Cabinet Capacity for Vehicle Fleets

Vehicle operations should be especially cautious about selecting cabinets from the advertised hook count alone.

A fleet of 80 vehicles may involve more than 80 physical key items when spare keys, duplicate sets and associated access keys are included.

Vehicle remotes can also be much bulkier than conventional door keys.

Before ordering, assemble several representative key sets and measure their approximate depth and width when hanging naturally.

This provides a much better indication of the internal space required.

Capacity Is Only One Part of Choosing a Key Cabinet

Once you know how many keys the cabinet needs to accommodate, consider the other specification requirements separately.

• Security level: what do the stored keys provide access to?
• Lock type: keyed, combination, digital or electronic access?
• Accountability: do you need to know who removed a key?
• Cabinet depth: are you storing ordinary keys or bulky bunches and fobs?
• Location: is there suitable wall space and door-opening clearance?
• Fixing: can the cabinet be securely fixed to the wall structure?
• Organisation: how will keys be numbered and indexed?

If the main question is the overall type of cabinet rather than capacity, see our Key Cabinets Explained guide.

For the wider relationship between cabinets, access control and key-management procedures, see our Key Storage Systems UK guide.

Key Cabinet Capacity Planning Checklist

1. Count every key that must be stored.
2. Include duplicate and spare keys.
3. Include master and service keys.
4. Count vehicle keys and electronic fobs.
5. Identify keys stored as bunches rather than individually.
6. Estimate future growth.
7. Allow suitable spare capacity.
8. Check the physical size of representative keys and bunches.
9. Check cabinet depth as well as hook count.
10. Consider whether one cabinet or several cabinets works better.
11. Check wall space and door-opening clearance.
12. Consider double-door formats for larger capacities.
13. Then select the appropriate security and access-control level.

Choose a Commercial Key Cabinet by Capacity

The right key cabinet should have enough room for the keys you manage today without becoming full as soon as new keys are added.

For a small office, that may mean approximately 20 or 50 positions. Larger workplaces, schools and facilities teams may need around 100 or 200 positions. Large estates and fleet operations may require 400 or 600-position cabinets or several cabinets divided by function.

Always consider the physical size of the contents as well as the stated hook count. Vehicle fobs, large tags and multi-key bunches can require deeper cabinets and greater spacing than individual flat keys.

Browse Total Locker Service’s range of secure key cabinets, including compact, deep, high-capacity, high-security and electronic options for commercial key management.

Commercial Key Cabinet Size FAQs