Storage Unit Size Guide in Milton, WA

Choosing the right storage unit starts with understanding how much you need to store. Use this guide to compare common unit sizes and the types of belongings they can typically hold. Actual layouts and available dimensions vary, so check current inventory or call (253) 392-2672 if you need help choosing a unit.

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Step One - Select Your Item Sizes

Put together a list of items that can fit in boxes and what size boxes. Don't forget to include items that cannot fit in boxes

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Step Two - Categorize Your Items

Make a quick list of items you plan to store, including furniture, appliances, and any awkwardly-shaped items that will not be packed in boxes

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Step Three - Categorize Your Item Quantities

Determine how many boxes of different sizes you'll be using. Make a list of all the pieces of furniture and other items you need to store in your unit

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Step Four - Estimate What Size Unit You Need

Now that you have compiled a list of how many boxes and items you need to store in your unit, use our Size Guide Breakdown below that gives tips and suggestions on what size unit you may need

Size Guide Breakdown

5' X 5'

A 5x5 storage unit provides about 25 square feet of space and is similar to a walk-in closet. It can work well for boxes, seasonal decorations, small furniture, office records, sports equipment, clothing, and other belongings that do not require a full room of storage.


Great for storing:

  • Small furniture or appliances
  • Office supplies, business records, and tax files
  • Garden tools, camping gear, or other seasonal decor and equipment
  • Old toys and offseason clothing

5' X 10'

A 5x10 storage unit provides about 50 square feet of space and is similar to a large walk-in closet or small shed. It can hold boxes, a bedroom set, small furniture, office supplies, seasonal gear, business materials, and selected appliances.


Great for storing:

  • Business materials, files, or inventory
  • Seasonal decorations and gear like lawn mowers, snowboards, and camping equipment
  • Bed sets, dressers, and side tables
  • Art pieces, musical instruments, and medium-sized appliances

10' X 10'

A 10x10 storage unit provides about 100 square feet of space and is often compared with half of a standard garage. It can be useful for furniture, mattress sets, appliances, boxes, bicycles, office furnishings, and belongings from a one-bedroom home.


Ideal for storing:

  • Furniture like sofas, tables, dressers, mattress sets, and coffee or nightstands
  • Electronics and musical instruments
  • Seasonal items such as garden tools, bicycles, skis, and camping gear
  • Office items including desks, chairs, and shelving

10' X 15'

A 10x15 storage unit provides about 150 square feet of space. It can accommodate larger furniture, bedroom sets, appliances, boxes, business inventory, office furnishings, and belongings from multiple rooms during a move or renovation.


Great for storing:

  • Large household items like sofas, dining tables, dressers, bedroom sets, and bookcases
  • Major appliances, including washers, dryers, and refrigerators
  • Outdoor gear such as grills, bicycles, skis, and camping equipment
  • Business inventory and office furnishings like desks, chairs, and shelving units

10' X 20'

A 10x20 storage unit provides about 200 square feet of space and is similar in size to a small garage. It can work well for larger household moves, furniture sets, appliances, boxes, business inventory, office equipment, and belongings stored during a renovation or home sale.


Great for storing:

  • Large household items like sectional sofas, dining tables, mattress sets, dressers, and entertainment centers
  • Major appliances including washers, dryers, and refrigerators
  • Big musical instruments and electronics, such as pianos and televisions
  • Outdoor gear such as lawnmowers, grills, bicycles, skis, and camping equipment
  • Business inventory and office furnishings like desks, chairs, and shelving units

10' X 30'

A 10x30 storage unit provides about 300 square feet of space and is similar to a large garage. It can accommodate substantial household storage, oversized furniture, appliances, business inventory, equipment, boxes, and belongings from larger moves or long-term projects.


Ideal for storing:

  • Items that are difficult to pack in boxes
  • Oversized furniture like sectional sofas, entertainment centers, and bedroom or dining sets
  • Major appliances including washers, dryers, and refrigerators
  • Outdoor gear such as lawnmowers, grills, bicycles, and small boats or canoes
  • Business inventory and office furnishings such as desks, chairs, and shelving