COSHH Cupboard and Chemical Storage: UK Requirements

What a COSHH Cupboard Needs (Short Answer)

A COSHH cupboard is a lockable, robust storage unit for hazardous substances that keeps them secure, contains spills, and separates substances that should not be stored together. There is no single "COSHH cupboard regulation" that dictates a particular cabinet — instead, the Control of Substances Hazardous to Health Regulations 2002 require you to control exposure, and safe storage is part of that control.

In practice, that means: keep substances in their original labelled containers, restrict access to authorised staff, contain any leaks, store incompatible chemicals apart, and follow the storage instructions on each Safety Data Sheet. The rest of this guide explains how to do each of those things.

Is There a Legal "COSHH Cabinet" Standard?

This is where a lot of confusion starts. COSHH does not specify a cabinet type, a colour, or a British Standard you must buy. The law sets the outcome — adequate control of exposure — and leaves the method to you.

The relevant duty sits in COSHH Regulation 7, which says exposure must be "either prevented or, where this is not reasonably practicable, adequately controlled." Safe storage is one of the engineering and organisational measures that helps you meet that duty. Storing a corrosive product in a leaking box on an open shelf is a control failure; storing it in a sealed, labelled, spill-contained cabinet is part of adequate control.

So when a supplier sells you a "COSHH cabinet," what you are really buying is a practical way to meet the storage side of your COSHH obligations. A sturdy lockable cupboard with a spill tray will do the job for most small businesses — you do not need to over-spend on industrial kit you will never fill.

The Core Storage Rules

These are the principles that show up consistently in HSE guidance and good practice across every sector.

1. Keep substances in their original containers

Always store a product in the container it came in, with the manufacturer's label intact. The label carries the hazard pictograms, the product identity, and the handling information. If you ever have to decant a substance into another container, that container must be fit for purpose and clearly labelled with the same hazard information — never an unlabelled bottle, and never a food or drink container.

2. Restrict access

Hazardous substances should be stored where only authorised, trained people can get to them. For most small workplaces that means a lockable cupboard or store, with the key held by a named person. This protects untrained staff, visitors, and — in settings like schools or care homes — vulnerable people who might otherwise reach the chemicals.

3. Contain spills

A leak should not be able to spread across the floor or reach a drain. Cabinets designed for chemical storage include a sump or spill tray in the base. As a rule of thumb for liquids, the containment should hold at least 110% of the volume of the largest container you normally store in it — so if the biggest bottle is 25 litres, the bund needs to catch around 28 litres.

4. Store incompatible substances apart

This is the rule people miss most often. Some substances react dangerously if they leak and mix. Keep these groups physically separated — ideally in different cabinets:

Acids and alkalis — react together, sometimes violently
Oxidisers and flammables — an oxidiser can feed a fire
Flammables — kept away from ignition sources and from anything that could feed a fire

Bleach (a common workplace chemical) is a good example of why this matters: mixed with an acidic descaler it releases chlorine gas, and mixed with ammonia it releases toxic chloramine vapour. Separated storage is the simplest way to make accidental mixing impossible.

5. Get the environment right

The storage area should be well ventilated, well lit, tidy, and have a floor that resists chemical damage and is easy to clean. Follow any temperature or light requirements on the Safety Data Sheet — some products degrade or become unstable if they get too warm.

Flammable Substances Need Extra Care

If you store flammable liquids — solvents, thinners, certain aerosols, fuels — there are a few extra points:

Keep only the quantity you actually need in the workroom; bulk stock belongs in a separate, suitable store.
Store them in fire-resisting cabinets or bins designed to retain spills.
Keep them away from ignition sources, oxidisers, and exits or escape routes.

The aim is to limit how much flammable material is present and how easily a fire could start or spread.

How Storage Fits Your COSHH Assessment

Storage is not a separate exercise — it is one of the control measures you record in your COSHH assessment. When you assess a substance, Section 7 of its Safety Data Sheet ("Handling and storage") tells you the specific storage conditions, and you record how you meet them.

A good way to keep on top of this is a chemical register — a single list of every hazardous substance, where it is stored, and whether its storage conditions are being met. When an inspector asks "show me where you keep your chemicals and how you keep them apart," the register plus a quick look at the cupboard answers the question in seconds.

Quick Storage Checklist

Every substance in its original, labelled container
Storage lockable, access restricted to authorised staff
Spill containment in place (110% of largest container for liquids)
Acids, alkalis, oxidisers, and flammables stored apart
Flammables in fire-resisting storage, away from ignition sources
Storage area ventilated, lit, with a chemical-resistant floor
Storage conditions match each Safety Data Sheet (Section 7)
Storage recorded as a control measure in your COSHH assessments

Getting Chemical Storage Under Control

Most storage failures are not about the cabinet — they are about losing track of what you have, where it is, and what it should not be stored next to. A spreadsheet works at first, but it falls behind the moment products change or a new site opens.

COSHHmate is being built to keep your chemical register and COSHH assessments in one place, so you always know what you are storing and that each substance's storage conditions are recorded against it. Pricing will be a flat monthly fee with no per-user charges. If you want to get your chemical storage properly organised, join the waitlist to be first to know when COSHHmate launches.

Sources

This is general guidance based on the COSHH Regulations 2002 and published HSE guidance. Verify storage requirements for your specific substances against their Safety Data Sheets and HSE guidance. Not legal or safety advice.