How many compartments does a triple width locker have?

Three columns of compartments in one nest, so the compartment count is the door count multiplied by three. A 6-door triple width gives 18 compartments; a 10-door gives 30. On this collection the range runs from 6 compartments (2-door imperial) to 30 (10-door in either standard).

What is the cheapest way to buy lockers per person?

The highest door count the compartment contents will tolerate. Across the 24 triple-width configurations, cost per compartment runs from £54.05 on the Standard Metric 10-door flat top to £148.31 on the 2-door imperial — a factor of 2.74 on the same steel to the same 1800 mm height. Doors are cheap; carcasses are not.

How much does a sloping top add to a locker?

Exactly £74.31 to £74.32 on a triple-width nest, on every configuration we compared — that is £24.77 per column, charged as a flat fee rather than a percentage. Because the fee is fixed, it works out at £2.48 per compartment on a 10-door nest and £8.26 on a 3-door.

What is the difference between metric and imperial lockers?

Five to seven millimetres, and 20% on the price. Metric depths are 300 / 380 / 450 mm; imperial are 305 / 381 / 457 mm. Every comparable flat-top imperial locker costs exactly 20.0% more than its metric equivalent. Unless you are matching an existing imperial installation, specify metric — the two standards cannot be mixed in one run and give a flush face.

Are triple width lockers available with charging?

No. The PowerBox charging range — 3-pin mains, USB-A and USB-C — is not made in a three-column nest. If a device scheme needs charging at high density you will be specifying single or double-width PowerBox nests and accepting a higher cost per compartment.

What lock is fitted to Probe triple width lockers?

A Type A cam lock on every compartment, fitted as standard. The product data lists no hasp, no padlock provision, no coin-return mechanism and no electronic lock on any Probe locker. If padlock or coin-return locking is a requirement, this range will not meet it as supplied.

What is a 3 tier locker?

Trade shorthand for three compartments stacked in one column — what we list as a 3-door locker. It is a different thing from a nest of three, which means three columns joined side by side. Every product in this collection is three columns wide, so check whether a supplier is quoting columns or compartments before comparing prices.

Do perforated lockers cost more than solid ones?

Not consistently. On the 5-door triple width the perforated nest is £63.73 cheaper than the solid metric equivalent; on the 6-door it is £49.53 dearer. The direction of the premium reverses inside the same range, so it is not safe to budget on perforated costing more.

Triple Width Lockers

Triple-width lockers are three columns of compartments in one nest. A 6-door triple width is not six compartments — it is eighteen, in a single bay that shares its internal walls. That shared structure is the whole point: it is why a triple-width nest gives you the lowest cost per compartment of any locker format we sell, and why it is what most schools, changing rooms and shift-based workplaces actually end up specifying. This collection holds 24 configurations from the Probe range, from a 2-door nest of 6 compartments up to a 10-door nest of 30.

A height difference that is not in the product names and matters for a mixed run: the Standard Imperial lockers are 1780 mm tall, not 1800 mm. All 19 imperial products in the catalogue state 1780; all 48 metric, PowerBox, vision panel and perforated products state 1800. So metric and imperial nests differ by 20 mm in height as well as 5–7 mm in depth — a mixed run will not line up at the top or sit flush at the face. The imperial body exists to drop into an existing 1780 mm installation without re-planning the wall; if you are not matching one, specify metric.

A note on vocabulary before anything else, because it costs people time: the locker trade calls these "3 tier", "nests" and "banks" as often as it calls them triple width. A "3 tier locker" means three compartments stacked in a column, which is our 3-door. A "nest of 3" usually means three columns joined — which is what every product on this page is. Where a supplier quotes you a "bank", check whether they are counting columns or compartments before you compare prices with ours.

Cost per compartment: the number that decides this

Every product on this page is three columns wide, so the compartment count is simply the door count times three. That makes the comparison unusually clean, and it produces the single most useful figure for anyone buying at volume. Across the 24 configurations the cost per compartment runs from £54.05 to £148.31 — a factor of 2.74 on lockers of the same steel, to the same 1800 mm height, in the same finish.

Configuration	Compartments	From	Per compartment
Standard Metric, 10 door, flat top	30	£1,621.61	£54.05
Standard Metric, 6 door, flat top	18	£990.64	£55.04
Standard Metric, 8 door, flat top	24	£1,322.62	£55.11
Standard Metric, 10 door, sloping top	30	£1,695.92	£56.53
Perforated Metric, 6 door, flat top	18	£1,040.17	£57.79
Standard Metric, 6 door, sloping top	18	£1,064.95	£59.16
Perforated Metric, 5 door, sloping top	15	£928.86	£61.92
Standard Imperial, 10 door, flat top	30	£1,945.93	£64.86
Standard Imperial, 8 door, flat top	24	£1,587.14	£66.13
Standard Metric, 5 door, sloping top	15	£992.59	£66.17
Standard Imperial, 4 door, flat top	12	£954.26	£79.52
Standard Imperial, 3 door, flat top	9	£889.15	£98.79
Standard Imperial, 2 door, sloping top	6	£889.85	£148.31

Read the "from" price on this collection with care, because the cheapest bay on the page is the most expensive locker on it. The lowest headline figure belongs to the 3-door imperial nest at £889.15 — but that buys nine compartments, at £98.79 each, against £54.05 for the 10-door metric nest. If your compartment size is genuinely dictated by what goes in it, that is a fair trade. If it is not, you are paying nearly double per user for the same steel. The rule that falls out of the table: buy the highest door count the compartment contents will tolerate. Doors are cheap; carcasses are not.

The sloping top costs exactly £74.31, whatever you put it on

This is worth stating precisely because nobody publishes it. We compared every configuration that exists in both flat and sloping top — ten matched pairs across all three ranges — holding size and colour constant. The sloping top adds £74.31 or £74.32 every single time. Not a percentage. A flat fee.

Configuration	Flat top	Sloping top	Premium	As a %
Standard Imperial, 3 door	£889.15	£963.46	+£74.31	8.4%
Standard Imperial, 4 door	£954.26	£1,028.58	+£74.32	7.8%
Standard Metric, 6 door	£990.64	£1,064.95	+£74.31	7.5%
Perforated Metric, 6 door	£1,040.17	£1,114.49	+£74.32	7.1%
Standard Metric, 8 door	£1,322.62	£1,396.93	+£74.31	5.6%
Standard Imperial, 8 door	£1,587.14	£1,661.46	+£74.32	4.7%
Standard Metric, 10 door	£1,621.61	£1,695.92	+£74.31	4.6%
Standard Imperial, 10 door	£1,945.93	£2,020.25	+£74.32	3.8%

That is £24.77 per column, three columns to a nest. The consequence is the useful half: because the fee is fixed and the compartment count is not, the sloping top gets cheaper per user the taller the column. On a 10-door nest it is £2.48 per compartment; on a 3-door nest it is £8.26. If you are specifying a corridor run where people will otherwise stack boxes, sit on the tops or leave litter on them, the sloping top on a high-door-count nest is one of the cheapest permanent problems-solved-in-advance in this catalogue. On a low-door-count nest it is a much weaker case.

Imperial costs exactly 20% more — and here is why the sloping figures look different

On every directly comparable flat-top pair, the imperial locker costs exactly 20.0% more than the metric one, to the penny. 6 door: £990.64 to £1,188.77. 8 door: £1,322.62 to £1,587.14. 10 door: £1,621.61 to £1,945.93. It holds at all three depths too — the metric 10-door at 300, 380 and 450 mm deep is £1,621.61 / £1,673.32 / £1,704.88, and the imperial equivalents are £1,945.93 / £2,007.98 / £2,045.86. Multiply any metric figure by 1.2 and you get the imperial one.

On sloping-top pairs the premium reads 18.6% to 19.1% instead, and the reason is now obvious rather than mysterious: the ×1.20 applies to the carcass, and the £74.31 top is added afterwards to both. A fixed sum added to both sides of a ratio pulls it towards 1. The imperial range is priced by formula, not by cost.

What are you paying 20% for? Five, one and seven millimetres. Metric depths are 300 / 380 / 450 mm; imperial are 305 / 381 / 457 mm. The widths differ by the same order. Our recommendation is unambiguous: unless you are extending or matching an existing imperial installation, specify metric. The two standards cannot be mixed in one run and give a flush face, and ten 457 mm nests are 70 mm wider overall than ten 450 mm nests — enough to lose a wall recess or foul a door frame.

The exception that removes the choice

The metric range only exists in 5, 6, 8 and 10 door on triple width. Imperial covers 2, 3, 4, 5, 6, 8 and 10. So if you need a 2, 3 or 4-door triple-width nest — large compartments for coats, bulky PPE, sports kit or full-length garments — imperial is the only option on this page and the 20% premium is unavoidable, because there is nothing to compare it against. Worth knowing before you budget rather than after.

Ventilated doors: three configurations, and a price inversion

Perforated doors are laser-cut for airflow, with the carcass and floor remaining full solid steel and the doors reinforced. They are what you want for wet kit, sports gear, PPE and anything that will otherwise be shut in damp. On triple width there are exactly three: 4, 5 and 6-door sloping top, plus a 6-door flat top. If the specification says ventilated and triple width, that is the whole choice.

And the pricing does something counter-intuitive. At 5 door the perforated nest is £63.73 cheaper than the solid metric equivalent; at 6 door it is £49.53 dearer. The direction of the premium reverses inside the same range. We have checked both against live variant prices — it is a genuine ranging characteristic, not a stale figure, and it means "perforated costs more" is not a safe assumption to budget on.

Two things you cannot buy in triple width

Stated plainly, because both are easier to discover here than at survey stage:

There is no triple-width charging locker. The PowerBox range — 3-pin mains, USB-A and USB-C — does not extend to three-column nests. If a one-to-one device scheme needs charging at high density, you are specifying single or double-width PowerBox nests and accepting a higher cost per compartment. See the charging lockers range for what is available.
There is no triple-width vision panel locker. Clear-fronted doors are a 300 mm single-width format only, 1 to 6 doors. If your site requires visual inspection of contents, triple width is not available to you.

Specification: what these actually are

All 24 products in this collection share a consistent specification, taken from the live product data:

Height — full height, but not the same height across both standards: the 11 metric and perforated nests are 1800 mm; all 13 Standard Imperial nests are 1780 mm.
Construction — cold-rolled mild steel, powder-coated. The bodies are formed, not welded.
Locking — a Type A cam lock on every compartment, fitted as standard. The product data lists no hasp, no padlock provision, no coin-return mechanism and no electronic lock on any Probe locker. If padlock or coin-return locking is a firm requirement, this range will not meet it as supplied — that is worth establishing before an order rather than after. Our guide to locker lock types covers the alternatives and where they come from.
Doors — reinforcing ribs for rigidity and ventilation slots for airflow, with a coat hook in every compartment.
Sizes — metric 300 × 300, 300 × 380 and 300 × 450 mm; imperial 305 × 305, 305 × 381 and 305 × 457 mm.
Colours — three carcass colours (silver/grey, black, white) and seven door colours (red, yellow, blue, green, black, white, silver). All 21 combinations are one price, which is why the listings carry 63 variants: 21 combinations across three sizes. Choose colour for the room, not the budget.
Depth — going from the shallowest to the deepest option costs about 5% on both standards (£83.27 on the metric 10-door, £99.93 on the imperial). For half as much usable volume again, that is usually the easiest yes on the specification.
Manufacture — UK, by Probe.

What the product data does not state

So that you get it in writing rather than inferred: across all 24 products there is no stated warranty period, no lead time, no stock status, no master-key or key-suiting option and no steel gauge. On a school, gym or multi-site order at least one of those is usually a condition of purchase. Ask for it at enquiry stage and get it confirmed on the order.

Choosing between widths

Triple width is the right answer when you have a run of wall and a lot of users. It stops being the right answer when the users need different compartment sizes, when the wall run is short, or when the nest cannot physically get into the room — these are delivered assembled, and an 1800 mm tall three-column nest has a turning circle. Check the doorway, the lift and the route from the loading point before the lorry books in.

For fewer users per bay, individually specified compartments, or charging, see double-width lockers and single-width lockers. For broader compartments for coats and bulky kit, see wide-format lockers. To browse by compartment count instead of by width: 2 door, 3 door, 4 door, 5 door, 6 door, 8 door and 10 door lockers.

By range: standard metric, standard imperial, perforated and vision panel. By top style: flat top and sloping top. Or browse the full metal lockers range and the Probe collection.

Buying for a changing room? Lockers and benching are almost always one order — see cloakroom benches. For sector-specific guidance, read our school lockers buying guide, our gym and leisure locker guide, our staff and workplace lockers guide or our general guide to choosing metal lockers.