What Not to Store in a Storage Container (UK Guide)

Most “what not to store” lists online are written for American indoor storage units. A steel shipping container sitting in a Salford yard is a different beast — no heating, no power sockets, and walls that sweat when the temperature swings. So here’s the honest list, based on the questions we actually get asked at our yard.

The hard no’s

Fuel, gas and anything flammable. Petrol, diesel, paraffin, gas bottles (including the one from your BBQ), white spirit, paint thinners. This isn’t us being difficult — it’s the one rule every container yard enforces, because one leak in a sealed steel box is a serious fire risk. Drain mowers, strimmers and generators fully before they come anywhere near a container.

Paint, chemicals and aerosols in quantity. A couple of sealed tins for the house move? Fine, ask us. A decorator’s van-load of trade paint, solvents and sprays? No — fumes build up in a sealed container, and in summer the heat makes it worse.

Food and anything perishable. Tins and sealed jars are one thing; anything that can rot, leak or smell is another. A steel container isn’t a pantry — no airflow, and in winter the condensation will find every weak spot. Perishables also invite mice, and mice don’t stay in one container.

Living things. Plants, animals — obvious, but people do ask. A dark steel box with no light or ventilation kills plants in days and is cruelty to animals. Full stop.

Anything illegal. Stolen goods, unlicensed firearms, drugs. We have 24/7 CCTV across the yard, and we’d rather not have that conversation with anyone.

The grey areas people ask us about

Car and motorbike batteries. A disconnected 12V battery in good condition is generally fine. Swollen or damaged lithium batteries from e-bikes and power tools are not — if a battery looks puffy or smells sweet/chemical, don’t store it. That’s a fire waiting to happen, container or not.

Important documents and valuables. Not banned, but think about it: passports, deeds and family jewellery are irreplaceable. A container is secure, but a bank or a fire safe at home is the right place for the truly irreplaceable. Insurance won’t bring back the originals.

Damp or wet items. This is the one that actually ruins people’s belongings — not theft, not fire. A damp mattress, wet garden furniture or soggy boxes go into a container in October and come out in spring covered in mould. If it isn’t bone dry, don’t store it. Dry it first, or don’t bring it.

Mattresses and leather sofas on the bare floor. Not prohibited, but a steel floor gets cold and condensation forms underneath. Pallet, wrap, or at least a layer between the item and the steel.

The simple rule

If it can burn, rot, leak, attract pests or die in the dark — it doesn’t go in the container. Everything else, ask us. We’d rather have a two-minute conversation at the gate than a problem six months later. And if you’re unsure how to protect what’s inside, read our packing guide.

Storing with us? Call 07375 063637 — open 7 days, 9am–9pm.