The 7 Things You Should Never Store in a Self-Storage Unit (and What to Do Instead)
Posted 17 Sep 2025
Self-storage is the perfect solution when you need extra space — whether you’re relocating, running a growing business, or simply decluttering. But not everything belongs in a storage unit. In fact, storing the wrong items can lead to safety risks, insurance issues, and unnecessary costs.
At U Hold the Key, we’ve seen it all. Our customers trust us to keep their belongings safe, and part of that is making sure people know what not to store.
Here are 7 things you should never keep in self-storage and the smarter alternatives you can use instead.
Anything that can spoil, rot, or attract pests is a definite no-go. Even tinned or bottled items are best avoided for long-term storage.
What to do instead: Store only sealed, non-perishable items in a cool, dry place at home. For businesses, we recommend commercial-grade cold storage or inventory rotation systems.
Ppetrol, fireworks, gas cylinders, batteries anything flammable or potentially explosive is not permitted. They’re dangerous to store and not covered by insurance.
What to do instead: Local recycling centres and hazardous waste facilities can dispose of these materials safely.
It may sound obvious, but animals, plants, or any living creature should never be placed in storage. Units aren’t ventilated or designed for life support.
What to do instead: Plants can be rehomed with neighbours or looked after by a plant-sitting service during moves.
Storing damp clothing, sports gear, or machinery can create mold, mildew, and lasting damage (not only to your things but to anything stored nearby).
What to do instead: Always dry items thoroughly before storing. For machinery, drain fluids and wipe down with protective sprays.
While our sites are highly secure, cash, bonds, or financial instruments shouldn’t be stored in a unit. Insurance policies typically exclude them.
What to do instead: Banks and financial institutions are the safest option for storing financial assets.
Original birth certificates, passports, wills, or legal papers should be stored somewhere with guaranteed protection against fire or theft.
What to do instead: Use a fireproof safe at home or a safety deposit box with your bank. We recommend keeping copies of documents (digitally and physically) if you do choose to store related files.
Jewellery, antiques, or rare collections can technically be stored if properly packed, but if they’re uninsured you risk significant loss.
What to do instead: Always check your insurance cover. U Hold the Key offers secure storage solutions, but we advise customers to double-check policies for high-value goods.
Most people are surprised by at least one item on this list — but it’s all about keeping you and your belongings safe.
By following these guidelines, you’ll get the best out of your storage experience — and avoid costly mistakes.
Ready to store your items safely?
Explore our secure, flexible storage solutions across the North East. Whether you’re a business needing long-term space or a homeowner looking to declutter, we’ll help you find the perfect unit.
Call us today to book a unit at your nearest site or click below to reserve online