Shallow vs Deep Lockers UK: 300mm, 450mm and 600mm Locker Depths Compared (2026 Guide)

Shallow lockers save floor space and improve aisle clearance, while deep lockers provide more internal storage for coats, bags, PPE and bulky items. The right locker depth depends on what users need to store, how much room is available and how the lockers affect movement through the space.

This guide compares 300mm, 450mm and 600mm lockers, explains when shallow lockers are better, and shows when deep lockers can cause layout problems.

For the main sizing hub, read our locker depth and projection guide. Space planning, see the minimum space for lockers guide. For compact rooms, use our small locker room design guide.

Quick answer: should you choose shallow or deep lockers?

Choose shallow lockers when floor space is limited, aisles are narrow or users only need to store small personal items. Choose deeper lockers when users need to store coats, bags, uniforms, workwear, helmets or PPE.

Locker depth	Best for	Main advantage	Main risk
300mm	Small items, compact rooms, valuables	Saves floor space	Limited internal depth
450mm	General staff, school and workplace storage	Balanced everyday depth	Needs proper aisle clearance
600mm	Bulky items, PPE, larger bags and equipment	High storage capacity	Can reduce usable room space

What is locker depth?

Locker depth is the distance from the front of the locker to the back. It determines how far the locker projects into the room and how much internal storage space each compartment provides.

Depth is different from width and height. Width affects how much side-to-side storage a user has. Height affects vertical storage. Depth affects both internal capacity and the amount of floor space left in front of the locker.

This makes depth one of the most important locker dimensions for layout planning.

300mm lockers: when shallow lockers work best

300mm lockers are shallow lockers designed for compact storage. They are useful where space is limited and users do not need to store bulky items.

They are often suitable for:

• phones, wallets and personal items
• small bags
• documents and folders
• compact workplace storage
• small staff rooms
• restricted corridors or tight layouts

The main benefit is space saving. A 300mm locker projects less into the room, which can help maintain aisle width and reduce congestion.

The limitation is storage capacity. A shallow locker may not be suitable for bulky coats, helmets, boots, PPE or large bags.

450mm lockers: the balanced everyday option

450mm lockers are a common practical choice for many UK workplaces, schools, gyms and staff areas. They offer more internal space than shallow lockers without projecting as far into the room as deeper units.

They are often suitable for:

• coats and bags
• school storage
• staff personal storage
• changing rooms
• general workplace lockers
• multi-tier locker banks

450mm depth is often a good compromise where users need practical storage but the room still needs clear movement space.

The main caution is layout. A 450mm locker still needs enough clearance in front for users to open doors, stand, turn and pass others.

600mm lockers: when deeper lockers are needed

600mm lockers provide more internal depth for larger or bulkier items. They can be useful where standard lockers are not deep enough for the items being stored.

They are often suitable for:

• PPE and workwear
• large bags
• helmets and boots
• sports kit
• specialist workplace equipment
• industrial changing rooms

The benefit is storage capacity. The risk is projection. A 600mm locker takes up more floor depth, which can reduce aisle width and make the room feel tighter.

In narrow rooms, deeper lockers can create door clashes, blocked routes and poor traffic flow. They should be used where the room can support the extra projection.

Depth comparison: 300mm vs 450mm vs 600mm

The best depth depends on the balance between storage capacity and room clearance.

Depth	Storage capacity	Space impact	Best use
300mm	Low to moderate	Lowest projection	Small items and tight spaces
450mm	Moderate	Balanced projection	General storage
600mm	High	Highest projection	Bulky items and specialist use

When shallow lockers are better

Shallow lockers are better when usable floor space is more important than internal depth. They can help small rooms, corridors and narrow changing areas work more effectively.

Choose shallow lockers when:

• the room is narrow
• aisle width is limited
• users only store small personal items
• lockers sit near a route or corridor
• door swing must be controlled carefully
• the layout needs better traffic flow

A shallow locker may be the better design choice even if a deeper locker offers more storage. If the room becomes difficult to move through, the extra internal depth may not be worth it.

When deep lockers cause problems

Deep lockers cause problems when the room cannot support their projection. The issue is not only the locker footprint. It is the loss of usable space in front of the lockers.

Deep lockers can create problems when:

• aisles become too narrow
• doors open into main circulation routes
• benches sit too close to the locker run
• users cannot pass during busy periods
• the room has inward-opening doors or awkward corners
• accessible routes or turning space are reduced

A deeper locker should solve a storage problem, not create a layout problem.

How locker depth affects aisle width

Locker depth directly reduces the clear space left in the room. A deeper locker projects further from the wall, leaving less room for users to move.

For a simple single-sided locker run, use this calculation:

Total required depth = locker depth + clear access space

Example with 450mm lockers and 1200mm clear access:

450mm + 1200mm = 1650mm total room depth

If the locker depth increases to 600mm, the same access space needs:

600mm + 1200mm = 1800mm total room depth

That extra 150mm can matter in a small room.

How locker depth affects door clearance

Depth affects projection, but door clearance affects how the locker is used. A deep locker with poor door clearance can become awkward, especially when users need to stand close to it, bend down or access lower compartments.

Door clearance becomes more important when:

• lockers face each other
• benches are opposite the lockers
• the aisle is also a circulation route
• users access lockers at the same time
• lower-tier compartments are used frequently

For more detail, read our locker door clearance guide.

How locker depth affects small rooms

Small rooms are less forgiving. A 600mm locker may work well in a large changing room but cause problems in a compact staff room. Shallow lockers can help protect movement space and reduce the feeling of overcrowding.

In small rooms, check:

• whether doors can open fully
• whether users can stand in front of lockers
• whether another user can pass behind
• whether benches reduce access space
• whether accessible users can approach and turn

If any of these fail, the lockers may be too deep for the room.

Locker depth by setting

Setting	Likely depth	Reason
Small office	300mm to 450mm	Personal storage with limited room depth
School locker area	300mm to 450mm	Bags and books with high user flow
Workplace changing room	450mm to 600mm	Clothing, uniforms and workwear
Factory or industrial site	450mm to 600mm	PPE, boots and bulky items
Gym or leisure centre	300mm to 450mm	Bags, clothing and valuables
Specialist equipment storage	600mm+	Larger equipment or site-specific needs

Decision guide: which depth should you choose?

Use this simple decision guide at the early planning stage.

Question	Better choice
Do users only store small personal items?	300mm may be enough
Do users store bags, coats or school items?	450mm is often suitable
Do users store PPE, helmets or bulky kit?	600mm may be needed
Is the room narrow?	Consider 300mm or 450mm
Is the room used during peak periods?	Protect aisle space before increasing depth
Are benches included?	Check the combined effect of locker depth and bench space

Common mistakes when choosing locker depth

• Choosing the deepest locker without checking aisle width
• Using shallow lockers for bulky items
• Forgetting that benches reduce usable clearance
• Placing deep lockers in narrow corridors
• Ignoring door swing and access space
• Assuming all users need the same compartment size
• Designing for storage capacity rather than daily use

FAQ: Shallow vs Deep Lockers UK (300mm, 450mm, 600mm)

What is the standard locker depth in the UK?
The most common standard depth is 450 mm, as it balances storage capacity and usable space. It suits most workplaces, schools and general locker use.

---

Are 300mm lockers too shallow?
Not necessarily. 300 mm lockers work well for small personal items like phones, wallets and small bags. They are ideal where space is tight, but they are not suitable for bulky items or coats.

---

When should I use 450mm lockers?
Use 450 mm lockers when users need to store:

• Coats
• Bags
• School items
• Everyday belongings

They are the most versatile option for general use.

---

When are 600mm lockers needed?
Choose 600 mm lockers when storing:

• PPE and workwear
• Large bags
• Helmets or boots
• Sports equipment

They are best suited to industrial or specialist environments where storage size matters more than floor space.

---

Do deeper lockers reduce aisle space?
Yes. Deeper lockers project further into the room, which reduces the available aisle width. This can affect movement, especially in small rooms or busy areas.

---

Is it better to choose shallow lockers to save space?
In many cases, yes. Shallow lockers improve movement and reduce congestion. However, they must still be deep enough for the items users need to store.

---

What happens if lockers are too deep for the room?
If lockers are too deep:

• Aisles become too narrow
• Doors may clash
• Users cannot pass easily
• The space feels cramped
• Access becomes difficult during peak use

---

Can I mix locker depths in one layout?
Yes. A mixed layout can work well. For example:

• Shallow lockers for valuables
• Deeper lockers for coats or PPE

This can improve both capacity and usability.

---

Which locker depth is best for small rooms?
For small rooms:

• 300 mm or 380 mm is often best
• 450 mm can work if space allows
• 600 mm is usually too deep unless the room is wider

---

How does locker depth affect door clearance?
Deeper lockers require more space in front for doors to open and for users to stand comfortably. If this space is not available, access becomes restricted.

---

What locker depth is best for schools?
Most schools use 300 mm to 450 mm lockers, depending on whether pupils store just books and bags or larger items.

---

What locker depth is best for workplaces?
Workplaces usually use 450 mm lockers for general use, with 600 mm lockers in industrial settings where PPE or bulky items are stored.

---

What is the key rule when choosing locker depth?
Choose the depth that fits the stored items without reducing usable space. Storage capacity matters, but movement, access and safety matter more in daily use.

Summary: shallow lockers save space, deep lockers store more

Shallow lockers are best when the room is tight, aisle space matters and users only need to store small or moderate items. Deep lockers are better when users need to store bulky belongings, PPE, bags or equipment.

300mm lockers save floor space but limit storage depth. 450mm lockers offer a balanced everyday option. 600mm lockers provide more storage but can reduce usable room space if the layout is tight.

The right choice is not always the deepest locker. It is the locker depth that gives enough storage while keeping the room safe, clear and practical to use.