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Built to your plan
20ft Custom & Office Conex Box
A 20ft office conex box turns our most popular container size into a workspace: a site office, workshop, break room or pop-up shop built to your plan. Start from a standard or high cube unit and add doors, windows, insulation, power, lighting, AC and shelving.
Condition
How you’d like it
- External (L × W × H)
- 20′ × 8′ × 8′ 6″
- Capacity
- ≈ 1,170 cu ft
- Tare weight
- ≈ 4,900 lb
- Custom configuration
- Get Quote
Every custom build is quoted from the base unit and the work involved.
Pricing, availability, and delivery are confirmed when you request a quote.
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Price
Upfront, competitive prices
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Accessories
Free shipping accessories
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Delivery
Delivery in 5 to 10 days
About the 20ft custom-built conex box
A custom-built container starts with a sound standard or high cube unit and is modified to your plan. Tell us how you’ll use it and we’ll scope the changes, from a single extra door to a fully fitted office.
Common modifications include personnel and roll-up doors, windows, insulation, electrical and lighting, shelving, vents, and paint in your colors. Every build is quoted based on the base unit and the work involved.
Why 20ft?
The most popular size we sell. It balances space, cost, and easy delivery, and fits on most residential and commercial sites.
What fits
About the contents of a one- to two-bedroom home, or roughly 10 standard pallets.
Who buys a 20ft custom & office conex box?
Popular 20ft builds: a two- to four-desk construction site office with a window AC; a workshop with a roll-up door, workbench and lighting; a split unit with an office at one end and lockable storage at the other; a break room; and a retail or food pop-up.
Starting from a 20ft high cube leaves an extra foot of headroom after insulation, which matters if people work inside all day. Every build is quoted from the base unit plus each change, so bring a rough layout and we’ll scope it. See more on our custom and office conex page.
Key features
- Personnel doors, roll-up doors, and windows
- Insulation and interior wall finishes
- Electrical, lighting, and outlets
- Shelving, workbenches, and racking
- Vents, AC units, and custom paint
Popular uses
- Site offices and break rooms
- Workshops and studios
- Retail and pop-up shops
- Secure equipment rooms
- Container homes and cabins
Choose what suits your budget
Available conditions
Ask for current photos and grade details of any unit before you decide.
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Available
New
- Custom configuration
- Get Quote
Also called one-trip. Typically shipped once from the factory, so expect clean paint, tight door seals, and little or no wear.
About new containers -
Available
Used
- Custom configuration
- Get Quote
Has been in service. Expect dents, surface rust, and faded or mismatched paint; graded cargo-worthy or wind and watertight.
About used containers and grades -
Available
Customized
- Custom configuration
- Get Quote
Starts from a new or used unit and is modified to your plan, such as doors, windows, shelving, insulation, or electrical.
About custom builds
Good to know
Questions about this container
What fits in a 20ft container?
About the contents of a one- to two-bedroom home, or roughly 10 standard pallets. Exact capacity depends on how the space is packed.
How long does it take to build a 20ft office container?
It depends on the work. A door or window can be quick; a fully fitted office with insulation, wiring and AC takes longer. We’ll give you a timeline with your quote.
Do I need a permit for a container office?
Often, yes, especially if people will work inside or it’s wired for power. Rules vary by city and county, so check with your local building department before you order.
Can I rent this container instead of buying it?
Yes. Choose Buy, Rent or Rent to own above and request a quote, and we’ll confirm what’s available for this unit in your area. See how conex rental and rent-to-own work.
Does the quote include delivery?
Delivery depends on your location, site access and the container selected. Share your ZIP or postal code when you request a quote so those details can be checked.
Not quite right?
You may also like
Compare the same style in another size, or another style in the same size.
Custom-built in other sizes
Built to your plan
8ft custom-built conex box
Start from a standard unit and add doors, windows, shelving, or other changes.
Built to your plan
10ft custom-built conex box
Start from a standard unit and add doors, windows, shelving, or other changes.
- Custom configuration
- Get Quote
Built to your plan
40ft custom-built conex box
Start from a standard unit and add doors, windows, shelving, or other changes.
- Custom configuration
- Get Quote
Built to your plan
45ft custom-built conex box
Start from a standard unit and add doors, windows, shelving, or other changes.
- Custom configuration
- Get Quote
More 20ft containers
Everyday workhorse
20ft standard conex box
Versatile enclosed space for general storage, materials, and cargo.
- New
- $3,000
- Used
- $2,100
Extra headroom
20ft high cube conex box
Additional interior height for taller loads or roomier storage.
- New
- $3,500
- Used
- $2,700
Top loading
20ft open top conex box
A removable roof lets tall or crane-loaded items go in from above.
Temperature control
20ft reefer conex box
Refrigerated space for temperature-sensitive cargo; confirm power and equipment needs.
- New
- $12,000
- Used
- $7,500
Steadier interior
20ft insulated conex box
Insulated walls help moderate interior temperature without active refrigeration.
- New
- $4,000
Oversized cargo
20ft flat rack conex box
Open sides and end walls suited to machinery and loads that don’t fit inside a box.
From the blog
Buyer guides
Plain-English answers to the questions buyers ask most.
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20ft Container Floor Plans: Office, Workshop & Storage Layouts
Practical 20ft shipping container floor plans for offices, workshops, studios, split office-and-storage units and organized storage, with dimensions and tips.