How to make a storage unit inventory you can search

Why a storage unit needs an inventory

Self-storage is common. A StorageCafe report from 2025 found about a third of US residents use a storage unit. People rent one during a move, a renovation, a downsizing, or simply for things they do not need every day. In each case the unit becomes a place you visit rarely, which is exactly when memory fails.

A box-by-box list saves wasted trips and repeat purchases, helps you decide what is worth the monthly rent, and gives you a record of what is there for insurance. It also lets someone else, such as a partner or a family member, collect something without opening every box.

Number every box by hand

The simplest system works best. Write a number on each box with a thick marker, on at least two sides and the top, so it is visible however the box is stacked. Keep the numbers sequential and never reuse one.

Add a short word if it helps, like “12 Kitchen”, but keep the detailed list in your inventory rather than on the box. A box that says “Box 12” tells a passer-by nothing about what is inside.

• Write the number on two sides and the top
• Use the same color marker for every box
• Number furniture and loose items too, with a tag or tape
• Put fragile and heavy notes on the box itself

Photograph each box before you close it

A photo of the open box is the fastest inventory you can make. Lay the main items on top, take one picture from above, then close and number the box. Later you can scan the photos instead of reading a list.

1. Pack the box

   Put the items you are most likely to want near the top.

2. Photograph it open

   One clear photo from above, plus a second if the box has layers.

3. Write the number on it

   Then photograph the closed box with its number so the two photos stay together.

4. List the contents

   Write down the main items, with brand, model and serial number for anything valuable.

5. Record where it is

   Note the box number and its spot in the unit, such as back left or top of the stack.

Keep the list by box and by location

Treat the unit like a room and each box as a location inside it. That way you can ask both “what is in Box 12?” and “where are the camping chairs?”.

• Storage unit / Box 1
• Storage unit / Box 12
• Storage unit / Furniture
• Storage unit / Back wall shelf
• Storage unit / Loose items

Climate and what to store with care

Standard units are not heated or cooled, so they follow the weather outside. Climate-controlled units typically hold a range of around 55°F to 80°F, according to SpareFoot, and some facilities also control humidity. If your unit is not climate-controlled, think about what you put in it.

• Wood, leather and upholstered furniture, which can crack, warp or grow mold
• Electronics and media, which can corrode in humid air
• Photos, books, documents and artwork
• Musical instruments
• Vintage clothing, wedding dresses and leather
• Collectibles and antiques

Storage unit insurance basics

Most self-storage leases say the facility is not responsible for loss or damage to what you store, so it is up to you to arrange coverage. Some facilities require proof of coverage before you move in.

Your homeowners or renters policy may already help. Off-premises coverage usually extends to belongings kept in a storage unit, but some insurers cap it at around 10% of your personal property limit, according to the Insurance Information Institute as cited by Policygenius. Policies commonly exclude flood, mold and pests, and special limits often apply to items such as jewelry and collectibles.

Facilities also sell their own options. Tenant insurance is a real insurance policy, while a tenant protection plan is not insurance: it is an addition to your rental agreement in which the facility agrees to cover certain losses up to a set amount. Read what each one covers, the limit, and whether it pays replacement cost or actual cash value.

• Ask your insurer whether off-premises coverage applies and what the limit is
• Compare that with the total value of what is in the unit
• Read the facility’s lease for its liability terms
• Keep your inventory and photos somewhere other than the unit

Make each visit count

Check your list before you leave home. Know which box you need, where it is in the unit, and what you will bring back. When you take something out or add something, update the list the same day so it stays accurate.

A visit every few months is also a chance to check for leaks, pests and damp, especially after storms. Restack boxes so the numbers face out, and put the boxes you open most often near the door.

How Allventory helps with a storage unit

Allventory lets you keep the unit as a location in your property, with each box as a location inside it. You write the box number on the box by hand; the list lives in the app.

1. Locations for each box

   Create nested locations such as “Storage unit / Box 12”, then filter by “Storage unit” to see everything in it, including every box.

2. Add several items from one photo

   Photograph an open box and review the suggested name and category for each item before saving.

3. Find things before you go

   Search by name or serial number, then open the item to see which box it is in.

4. Details for valuable items

   Record serial numbers, purchase prices and AI value estimates you review, and attach receipts.

5. Share with family

   On paid plans, invite a family member with view access so they can look things up, or as a contributor so they can update the list.

6. Export the list

   Export a CSV on any plan, or Excel and insurance supporting documents grouped by location on paid plans.