Shipping Container Office: 20ft vs 40ft, Which One Should You Actually Buy?

A shipping container office is the cheapest way to put 160 to 320 square feet of private, soundproof, lockable workspace in a backyard or jobsite. But the 20ft vs 40ft decision gets people stuck, and we see both outcomes: people who bought the 20ft and wish they had the 40ft, and people who bought the 40ft and wish they had saved the cash.

Here is the honest framework.

20ft: 160 sq ft, $5,400-$6,400 delivered

A 20ft one-trip container gets you roughly 160 square feet of interior. After 2 inches of closed-cell spray foam, 3/4 inch plywood subfloor, and 1/2 inch drywall, you land at about 140 usable square feet with 7ft 9in ceilings (or 8ft 2in if you go high-cube).

Best for:

• Solo home office with one desk and a bookshelf
• Podcast or video studio (sound isolation is great)
• Jobsite office for 1-2 people
• Backyard creative studio

Not enough for: A conference table, a second employee, or a bathroom.

40ft: 320 sq ft, $7,200-$8,400 delivered

A 40ft one-trip gets you twice the floor area for about 45 percent more money. This is almost always the better buy per square foot.

Best for:

• Two-desk office with a small meeting area
• Office + bathroom (plumbing typically fits in the last 6 feet)
• Jobsite command-trailer replacement
• ADU-qualifying home office with separate bedroom for guest use

Overkill for: A true single-person workspace where you already know 160 sq ft is enough.

Go 40ft high-cube if you are finishing the ceiling

Standard 40ft containers have 8ft 6in exterior height. After floor + ceiling finish you live with ~7ft 6in, which reads as short. A 40ft high-cube is 9ft 6in exterior and finishes at about 8ft 4in interior, which is what residential ADU inspectors expect and what your Zoom calls deserve.

For a 20ft, the high-cube premium is worth it if you are tall or if you plan to mount ceiling speakers or LED panels.

When the 20ft actually wins

Three scenarios:

1. Setback-tight lot. A 40ft box does not fit alongside a driveway with 3ft side-yard setbacks. A 20ft often does.
2. You want it movable. A 20ft on a gooseneck trailer can follow you to a second property or a vacation lot. A 40ft is a one-way trip.
3. Your home-office spend is capped at $15k all-in. At that budget, a finished 20ft is 90 percent of a finished 40ft functionally, for half the finish budget.

How we ship container offices

Every order ships tilt-bed (offloads in 15 minutes, no crane needed). We send depot photos before shipment so you see the exact unit you are buying. Get a delivered price on a 20ft or a 40ft high-cube — both are the right starting shells for an office build.