Nobody wants to pay for storage they don't need. However, a little extra space makes moving around within the unit much easier. It also gives you room to add those unplanned items that always seem to pop up.

Estimating how much space you will need for your storage items can be simple if you know what you want to store. Here are some simple steps to help you plan, and size recommendations based on commonly-stored items.

• Start by making a list of the items you plan to store.
• Group the items according to how you will organize them. Start by identifying items that will be packed in boxes and stacked. Next, prioritize boxed items you will want to access most frequently (they'll go closer to the front of the unit). Then, group by fragility or weight—heavier, sturdier items should be stored on the bottom of stacked items, fragile items on top. Then, consider awkwardly-sized items that won't stack well, including how ofter you will need to use them and how heavy they are.
• Make note of how these items will be packed and organized. Boxes and containers should be of uniform size and should be stacked no more than three or four high, depending on the size and strength of the containers you use.
• Estimate size based on long-term use.
• It is always a good idea to visit potential storage units to get a visual sense of the space you will be working with.

We have developed quick-reference guides to help you plan what size unit you will need for your personal, business or warehouse storage.