What Not to Put in a Storage Unit — and How to Store Everything Else

You've hired the van, you've started boxing things up, and you've booked your storage unit. Then you pause over a half-used tin of paint, a bag of dog food, or a box of old electronics and wonder: can that actually go in storage?

It's a question more people ask than you might think, and the answer isn't always straightforward. Some items are flatly prohibited for safety, legal or insurance reasons. Others are technically permitted but need a little care and preparation to come out in the same condition they went in. Knowing the difference before you load up saves you from damaged belongings, voided insurance, and in some cases, serious legal consequences.

This guide covers both. We've drawn on the Self Storage Association UK (SSA UK) guidelines, UK legislation, and years of operational experience to give you a complete picture of what not to put in a storage unit, why the rules exist, and what to do instead when storage isn't the right answer for a particular item.

Whether you're clearing a home, managing a house move, or storing business stock, here's everything you need to know before you start packing.

Self-storage units are remarkably versatile, but they are not a blank cheque for storing anything and everything. Every reputable facility in the UK operates within guidelines set by the Self Storage Association UK (SSA UK), the industry body that represents the sector and establishes standards for safety, security and best practice. SSA UK membership gives customers a meaningful baseline of protection and a clear framework for what is and isn't permitted.

Behind those guidelines, three core reasons explain why certain items are prohibited.

Safety. Storage units are purpose-built, secure spaces — and like any enclosed building, flammable or pressurised materials require more care than they would if they were stored outdoors. 

Legal compliance. UK law governs what can and cannot be held in a rented space. The Firearms Rules 1998, the Misuse of Drugs Act 1971 and the Proceeds of Crime Act 2002 all have direct relevance to what is permissible in a storage unit. Operators are not simply following their own house rules; in many cases, they are legally obliged to refuse certain items and to report suspected illegal use of their facilities.

Liability and insurance. Storing a prohibited item doesn't just risk your rental agreement; it can void your storage contents insurance entirely, and in serious cases may create personal liability for any damage caused. Following the rules protects you as much as anyone else. 

One important caveat: rules are not entirely uniform across the industry. Individual facilities set their own policies within the SSA UK framework, and what one provider permits, another may not. Always read your rental agreement carefully, and if you're unsure about a specific item, speak to the facility team before your move-in date rather than after.

Some items are prohibited across every reputable storage facility in the UK, regardless of how they're packed or how long you plan to store them. Here's what falls into that category and, crucially, why.

This is the category with the highest potential for serious harm. Petrol, diesel, paint, white spirit, turpentine, cleaning solvents, gas canisters, aerosols, fertilisers and fireworks are all prohibited. Storage units are sealed, purpose-built spaces — and in those conditions, flammable or pressurised materials carry a level of risk they simply don't in an open garage or garden shed. A leaking petrol container or a pressurised canister isn't just a risk to your belongings; it creates a potential hazard for the entire facility.

In our experience, the most commonly overlooked items in this category are the everyday ones: leftover paint from a decorating job, a bottle of white spirit, or a petrol lawnmower that hasn't been fully drained. None of them seem dangerous sitting in a garage, but in a sealed storage unit, they're a different matter entirely.

Food of any kind, including pet food stored in bags rather than sealed airtight containers, should not go into a storage unit. The reason is straightforward: in an enclosed space, organic matter can attract vermin. Rodents and insects are opportunistic, and food, even pet food in bags, gives them a reason to investigate. Keeping food out of storage units entirely is the simplest and most effective way to ensure this never becomes an issue, for your belongings or anyone else's.

No animals, no plants, no exceptions. Leaving a pet in a storage unit is not only prohibited under every facility's terms and conditions; it constitutes an offence under the Animal Welfare Act 2006. If you're moving and can't take your pet with you temporarily, a boarding facility, pet sitter, or trusted friend is the only appropriate solution.

Plants present a different but equally practical problem. Without light, airflow or water, they deteriorate quickly, and as they do, they can attract insects and encourage mould. They're simply not suited to storage.

This should go without saying, but it's worth stating clearly. Storing illegal drugs, stolen property, counterfeit goods or unlicensed items in a self-storage unit is a criminal matter, not just a breach of your rental agreement. Under the Proceeds of Crime Act 2002 and the Misuse of Drugs Act 1971, storage operators are legally obliged to report suspected illegal use of their facilities to the authorities. Discovery doesn't just end your contract; it can result in unit seizure, loss of all stored belongings and criminal prosecution.

The Firearms Rules 1998 require that licensed firearms be stored in a secure location that meets specific legal criteria. A self-storage unit does not meet those criteria, regardless of how secure the facility is overall. Firearms, ammunition, and offensive weapons cannot be stored without prior written approval from the facility, and in most cases, that approval will not be granted. If you need to store firearms legally, speak to the facility directly and expect to be directed to a specialist provider.

The simple rule here is: everything going into storage should be clean and dry before it goes in. Damp or mouldy items don't belong in storage because the moisture that goes in will affect everything packed around them. For appliances like fridges, freezers and washing machines, fully defrost, clean and dry them before storage. A few minutes of preparation here protects everything else in your unit.

Storage units are secure, but for high-value items the key consideration is insurance rather than security. Standard storage contents insurance has coverage limits that may not fully protect items of significant financial value — cash, jewellery and fine art included. For these items, it's worth reviewing your policy carefully and considering specialist coverage. Our team is happy to advise on the best approach for valuable items before your move-in date.

Not everything on this list is prohibited. The items below can legally go into a storage unit, and for most customers, storing them for short periods won’t cause any issues at all. For longer-term storage — or for items of particular value or sensitivity — it's worth taking a few simple precautions to make sure everything comes out in the same condition it went in. This is the category most storage guides don't cover, and a little preparation goes a long way.

Vinyl stores well in self-storage with a little preparation. Keep records upright rather than flat in a sturdy box, and position it away from exterior walls for the most stable conditions. A silica gel packet inside the box is good insurance for longer stays. CDs and DVDs are more resilient but benefit from the same approach.

Wood responds to its environment over time, which means a little preparation before storing wooden furniture makes a real difference for longer stays. Wrapping pieces in breathable furniture covers and elevating them off the floor on pallets is good practice for any wooden furniture going into storage. 

For musical instruments of real value — particularly guitars, pianos, or other instruments sensitive to humidity — it's worth speaking to a specialist about the best approach and preparation for longer-term storage, or asking our team for advice before you move in.

Leather stores best when it can breathe. Store leather items in breathable covers rather than sealed plastic bags, and use silica gel to manage moisture. For clothing and textiles, acid-free tissue paper for delicate items and breathable garment bags for everything else will go a long way. Consider cedar blocks or moth repellent sachets alongside your boxes for additional protection.

Electronics store well over short periods with a little care. Wrap items carefully, include silica gel packets inside boxes to manage moisture, and avoid packing electronics directly against exterior walls for best results.

Most storage facilities now restrict the number of lithium battery-powered vehicles per unit due to the risk of thermal runaway, a chain reaction that can cause a battery to overheat and catch fire. Before storing an e-bike, e-scooter or similar vehicle, check the facility's current policy, as this is a fast-evolving area. Where possible, store the battery separately from the vehicle and ensure it is not left on charge inside the unit.

Fine art, oil paintings and wine collections often have specific conservation requirements that go beyond standard storage — particularly for pieces of significant value. If you're unsure whether your items need specialist conditions, our team is happy to advise on the best approach before your move-in date.

Most customers never encounter this situation, because the rules are straightforward and most people follow them. But it's worth understanding the consequences clearly, because they are more serious than many people assume.

Contract termination. Storage operators can end your rental agreement immediately if prohibited items are discovered in your unit. There is no obligation to provide a refund for the unused rental period, and in many cases, you will be required to remove your belongings from the facility at short notice.

Loss of access. If the prohibited item is serious enough to warrant investigation, you may lose access to your unit entirely while that process takes place. That means no access to anything else stored in the unit, regardless of whether the other contents are perfectly legitimate.

Voided insurance. This is the consequence with the most immediate financial impact for most people. Storage contents insurance is almost universally invalidated by the presence of prohibited items. If your belongings are lost, stolen or damaged while a prohibited item is present in your unit, your insurer is extremely unlikely to pay out. You would be carrying the full cost of that loss yourself.

Criminal consequences. For illegal goods, stolen property, unlicensed weapons or controlled substances, the consequences move beyond the facility entirely. Storage operators are legally obliged to report suspected criminal use of their units, and discovery can result in police involvement, unit seizure and prosecution under relevant UK legislation. For the vast majority of customers storing everyday belongings, none of this applies. These consequences are reserved for the small minority who deliberately misuse their units. 

The straightforward way to avoid all of this is to check before you store. If you have any doubt about whether an item is permitted, speak to our team. It takes a few minutes and saves a great deal of potential difficulty.

It's easy to come away from a prohibited items list feeling uncertain about what actually belongs in a storage unit. The reality is that the vast majority of household and business items are perfectly fine, and self-storage is an extremely practical solution for a wide range of situations.

Here's what storage units are genuinely well-suited for.

Household furniture and large appliances. Sofas, beds, dining tables, wardrobes, washing machines, fridges: all fine, provided they are clean, dry and properly prepared. Disassemble large pieces where possible to make the most of your space, wrap upholstered items in furniture covers, and make sure appliances are fully defrosted and dry before they go in.

Seasonal items. Garden furniture, barbecues, Christmas decorations, ski equipment, camping gear: storage units are ideal for items you only need part of the year and don't want taking up space at home the rest of the time.

Boxes of clothing, books and household accessories. Everyday belongings that you're not currently using, whether you're in the middle of a move, a renovation, or simply decluttering, are exactly what self-storage is designed for.

DIY tools and equipment. Power tools, ladders, workbenches and similar items store well, with one important caveat: any machinery that runs on petrol or uses flammable fluids must have those fluids fully drained before going into the unit.

Vehicles. Cars, motorbikes and bicycles can be stored in appropriately sized units, subject to the facility's specific policy. Petrol should be drained completely and the vehicle should be clean and dry. Check with your facility in advance if you're planning to store a vehicle.

Business stock, equipment and documents. Self-storage is widely used by small businesses, sole traders and larger companies for storing inventory, equipment, archived documents and seasonal stock. It offers a flexible, cost-effective alternative to commercial warehouse space.

A note for business storage customers: If you're storing stock, equipment or trade materials, it's worth taking a few extra steps before you move in. Retailers cannot store perishable goods. Tradespeople may face restrictions on certain chemicals or materials. Documents should be stored in dry, sealed conditions. If your business handles any specialist materials, declare them to the facility team upfront; they will advise on whether your intended use is appropriate and whether any additional measures are needed.

Run through this before your move-in date to make sure everything goes smoothly.

Your items:

• Is everything clean, dry and free of food residue?

• Have you removed petrol, oil or flammable fluids from any machinery or vehicles?

• Are fridges, freezers and washing machines fully defrosted, clean and dry?

• Have you checked that nothing you're storing is wet, damp or showing signs of mould?

• Have you reviewed your insurance coverage for any high-value items? 

• Is everything you're storing legally owned and legitimately obtained?

• Are boxes clearly labelled and fragile items properly wrapped and protected?

• If any items are temperature or humidity-sensitive, have you spoken to our team about the best storage approach? 

Your unit:

• Have you read your rental agreement and checked the prohibited items list?

• Have you placed items you're likely to need access to near the front of the unit?

If you're storing for a business:

• Have you checked whether your stock, materials or equipment fall under any specific restrictions?

• Are documents stored in sealed, dry conditions?

• Have you declared any specialist materials to the facility team?

If you're unsure about anything on this list, speak to our team before your move-in date. It's always easier to sort out questions in advance than to deal with problems on the day.

The rules around self-storage are not designed to be restrictive for the sake of it. They exist to protect your belongings, the belongings of everyone else using the facility, and the people who work there. In practice, the vast majority of what people want to store presents no issue whatsoever.

The items covered in this guide fall into two broad categories: things that are prohibited outright for safety, legal or insurance reasons, and things that are technically permitted but need the right storage conditions to come out the other end in good shape. Knowing which category your belongings fall into before you start packing makes the whole process significantly smoother.

If there's one piece of advice worth taking from this guide, it's this: when in doubt, ask before you store. A quick conversation with our team before your move-in date can save you from damaged belongings, a voided insurance policy, or an awkward situation on the day. We're here to help you get it right from the start.

Ready to book your unit or want to check whether a specific item can be stored? Get in touch with our team today, or find your nearest location and get a quote online.

Or, if you have more questions, you can find out more about how self-storage works. 

As a general rule, no. Perishable food of any kind, including pet food stored in bags, is not permitted. The risk of attracting vermin and encouraging mould is too significant. Some facilities may permit certain sealed, non-perishable items in airtight containers, but this varies by provider. If you have a specific situation in mind, check with the facility team before assuming it's fine.

Yes, in many cases, subject to the facility's policy and unit size availability. The key requirements are that the vehicle is clean and dry, and that petrol is reduced to a minimal level before storage. Electric vehicles and those with large lithium batteries may be subject to additional restrictions depending on the facility. Always confirm with the team in advance rather than turning up on the day.

Your contents insurance is almost certainly voided by the presence of prohibited items, even if the prohibited item itself isn't what causes the damage. If you store an item that isn't permitted and something unrelated goes wrong, your insurer is very unlikely to pay out. It's one of the less obvious but most financially significant consequences of not following the rules. Find out more on our FAQ page.

No. Using a storage unit as accommodation is prohibited under every facility's terms and conditions. Units are purpose-built for storing belongings, not for habitation, and customers found to be living in a unit will have their contract terminated immediately.

For short periods, yes — electronics store well with a little care. For longer-term storage of valuable items, wrapping carefully and including silica gel packets inside boxes is good practice. If you have any questions about storing specific items, our team is happy to advise before your move-in date.

It depends on the specific materials. Many trade items store without any issue, but certain chemicals, flammable substances and hazardous materials are prohibited in the same way they are for domestic customers. If you're a tradesperson or business operator planning to store anything specialist, declare it to the facility team before you book. They will advise on whether it's permitted and whether any additional measures apply.

The simplest answer is to ask. If you're unsure whether something is permitted, contact our team before your move-in date. We would far rather spend five minutes answering a question in advance than have to turn something away on the day.