If you’re researching shipping container sizes for a storage, business, or building project in Oregon, the first decision you’ll make is also the most important one: 20ft or 40ft? Get the size wrong and you’re either paying for space you don’t need or running out of room halfway through your project.

This guide breaks down the real dimensions, capacity, weight, and pricing differences between 20ft and 40ft shipping containers — plus how to think through which one actually fits your project, whether that’s job site storage, a backyard workshop, or the start of a container ADU. It’s written by the team at Iron Box, Oregon’s own shipping container dealer, based out of our yard in Creswell — so every size and price point below reflects what’s actually in stock and moving out to job sites across the state, not generic industry averages.

Quick Answer: Which Size Do You Need?

• Choose a 20ft container if you need compact storage, a small workshop, a single-vehicle garage alternative, or you’re working with a tight backyard or lot.
• Choose a 40ft container if you’re storing a full household’s furniture, running a larger job site, building a multi-room workshop or ADU, or need serious commercial inventory space.

If you’re still unsure after reading this, that’s normal — most first-time buyers are. Iron Box’s team talks through square footage and use case with every caller before recommending a size, at no cost. Get a free quote and we’ll help you land on the right fit.

Why Oregon Buyers Choose Iron Box

Size is only half the decision — who you buy from matters just as much. Iron Box has delivered 1,000+ containers across Oregon, and a few things set us apart from national brokers reselling containers sight-unseen:

• Oregon-owned and operated. We’re not a call center — you’re talking to a local team that operates out of our own yard in Creswell, OR.
• Every container is inspected before delivery. Each unit gets a pre-delivery quality inspection and an honest condition grade (Cargo Worthy, Wind & Watertight, or one-trip) — no surprises when it shows up.
• Modifications happen in-house. Insulation, electrical, roll-up doors, and custom builds are done in our own Creswell shop, not subcontracted out to a third party.
• Transparent pricing. The price we quote is the price you pay — no hidden delivery fees or line items added later.
• You’re not locked in. Between month-to-month rentals and our buyback program, you have an exit path if your project changes.

That combination is why Iron Box maintains a 100% customer satisfaction track record and five-star reviews across the counties we serve. Keep that in mind as you size up your project below.

20ft vs. 40ft Shipping Container: Dimensions Compared

Shipping containers follow standardized ISO dimensions, so a 20ft or 40ft container will measure roughly the same no matter who you buy it from — what differs is condition, and every container Iron Box sells is graded and inspected before it leaves our yard. Here’s how the two sizes stack up:

Figures reflect standard ISO 668 container dimensions. Exact interior measurements can vary slightly by manufacturer and container condition — confirm specs on the unit you’re purchasing.

In short: a 40ft container isn’t just “bigger,” it’s exactly double the floor space of a 20ft, in the same 8-foot width. That matters more than it sounds like once you start planning layout — two 20ft containers side by side won’t give you the same open, unbroken span as one 40ft box.

What Fits in a 20ft Shipping Container?

A 20ft container is the most popular size for a reason — it’s large enough to be genuinely useful, but still small enough to fit on most residential lots and be moved without a permit headache in many cases. Common uses include:

• Storage: Contents of a 2-3 bedroom home, seasonal equipment, landscaping gear
• Job site storage: Tools, materials, and small equipment for contractors
• Small workshop or hobby space: With insulation and electrical added
• Backyard studio or office: A compact, standalone workspace
• Single-vehicle garage alternative: With a roll-up door installed

What Fits in a 40ft Shipping Container?

A 40ft container roughly doubles your usable space without doubling your footprint’s width — making it the go-to for anyone who’s outgrowing (or would immediately outgrow) a 20ft unit.

• Full household storage: Furniture and belongings from a 3-4+ bedroom home
• Commercial inventory or equipment storage: Retail overflow, seasonal stock, fleet equipment
• Larger workshops or garages: Room for multiple workstations or vehicles
• Container homes and ADUs: The extra length makes room layouts (bedroom, bathroom, living space) far more workable
• Agricultural and cold storage: Including refrigerated container conversions for farms and food businesses

20ft vs. 40ft Shipping Container Price

Container pricing depends on size and condition. Here’s what Oregon buyers can generally expect:

A few things that move the price within those ranges: condition grade (Cargo Worthy vs. Wind & Watertight vs. one-trip), local availability, and delivery distance. If you’re weighing new against used, our guide on new vs. used shipping containers breaks down exactly what those condition grades mean for durability and cost.

Not ready to buy outright? A month-to-month container rental is worth considering if your need is short-term or seasonal — no long-term contract required.

Want an exact number instead of a range? Iron Box can quote your specific size, condition, and delivery address the same day in most cases. Get a free, no-pressure quote and we’ll confirm current inventory in your county.

Other Sizes Worth Knowing

While 20ft and 40ft cover most projects, Iron Box also stocks 10ft, 45ft, and 53ft containers:

• 10ft containers work well for tight urban lots or as a small, secure lockbox for tools and equipment.
• 45ft and 53ft containers suit large commercial storage or specialized builds where maximum length matters most.

Frequently Asked Questions

How much space is a 40ft shipping container in square feet?

A standard 40ft shipping container has roughly 300 square feet of floor space — double the ~150 square feet in a 20ft container, within the same 8-foot width.

Can a 20ft container fit on a residential driveway?

In most cases, yes. A 20ft container’s footprint (20 ft x 8 ft) fits comfortably on a standard driveway or side yard, though local permitting and HOA rules should always be checked first.

What’s the difference between a “one-trip” and a “used” container?

A one-trip container has made a single ocean voyage and looks nearly new, with minimal wear. Used containers have seen more service and are graded Cargo Worthy (CW) or Wind & Watertight (WWT) depending on condition — still structurally sound, just more cosmetic wear.

Do I need a permit for a shipping container in Oregon?

It depends on your county, intended use, and how long the container will stay on the property. Storage use is typically less regulated than converting a container into a livable structure like an ADU. Iron Box’s team can point you toward the right local requirements for your project.

Which size is better for a container home or ADU?

Most container ADU builds use a 40ft (often High Cube) container or multiple containers combined, since the extra length and ceiling height make room layouts far more practical. See our container ADU guide for a full breakdown.

Does Iron Box deliver both 20ft and 40ft containers across Oregon?

Yes. Iron Box delivers both sizes (plus 10ft, 45ft, and 53ft) out of our Creswell yard to all nine counties we serve — Lane, Linn, Benton, Douglas, Marion, Multnomah, Deschutes, Klamath, and Curry. We’ve delivered over 1,000 containers statewide, so most requests can be scheduled quickly.

Still Not Sure Which Size Is Right for You?

Every project is different, and the “right” size depends on more than just square footage — it depends on your site access, budget, and long-term plans. As an Oregon-owned dealer working out of our own Creswell yard (not a national broker), Iron Box’s team can walk through your project over the phone and recommend a size with zero pressure — then get you a transparent quote with no hidden fees.

Get a Free Quote from Iron Box or call (541) 246-4696 (Mon–Fri, 8am–5pm) to talk to a real person on our team — not a call center.