Antioch, CA · Contra Costa County

Modular Buildings in Antioch

Compare modular office, classroom, and clinic building prices in Antioch, CA, and get quotes from suppliers that deliver there.

Starting from $560/month – $10,080/month

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Modular Building Prices in Antioch, CA

What you pay for a modular building in Antioch comes down to its size and layout, whether it is new or used, how long you lease it, and what it takes to deliver and set it on your site. The ranges below are monthly lease rates. Delivery, installation, and removal are quoted separately.

Estimated Pricing in Antioch, CA

Type	Monthly	Quarterly	Annual
Single-Section Office (500 to 900 sq ft)	$560 – $1,232	$1,512 – $3,326	$5,600 – $12,320
Modular Classroom (24' x 40')	$1,008 – $2,240	$2,722 – $6,048	$10,080 – $22,400
Double-Section Office (1,400 to 2,000 sq ft)	$1,344 – $3,136	$3,629 – $8,467	$13,440 – $31,360
Multi-Section Office Complex (3,000+ sq ft)	$3,360 – $8,960	$9,072 – $24,192	$33,600 – $89,600
Clinic or Lab Building	$3,920 – $10,080	$10,584 – $27,216	$39,200 – $100,800

* Prices adjusted for Antioch market (approximately 12% above national average).

These are estimates for the Antioch area. Real quotes depend on what suppliers have in their yards near Contra Costa County right now. Use the form on this page to get pricing from suppliers that cover Antioch, or call to talk through what you need.

Who Uses Modular Buildings in Antioch

Schools: classrooms for growing enrollment, and swing space while a campus is rebuilt.
Contractors: project offices on jobs that run longer than a trailer is comfortable for.
Healthcare: clinics, labs, and administrative space during an expansion.
Businesses and public agencies: sales centers, branch offices, and permanent buildings on a faster schedule than conventional construction.

Lease or Buy?

If the need in Antioch has an end date, lease. If you expect to use the building for more than three to five years, ask for a purchase price too, because buying usually wins over that stretch. Suppliers can quote both, and many offer lease-to-own.

Permits and Site Prep in Antioch

Most modular buildings need a permit, and the rules depend on how long the building stays and how it is used. Call the building department that covers your site in Antioch before you sign. Have a level spot with truck access picked out, and know where power, water, and sewer will come from.

Frequently Asked Questions

Monthly rates in Antioch typically run from $560 to $10,080, depending on size, floor plan, and how long you keep it. Prices in Antioch tend to run about 12% above the national average. Delivery, setup, and removal are quoted separately.

Square footage and layout matter most, followed by lease length, restrooms and plumbing, ramps and steps, and how far the building has to travel to your site in the Antioch area. Longer terms usually bring the monthly rate down.

A standard unit that is already in a supplier's yard can often be on site within a couple of weeks. Larger or custom buildings take longer because they have to be configured or built first. Ask each supplier what they have available near Antioch right now.

Usually, yes. Most cities and counties want a permit for a temporary or permanent building, and the rules depend on how long it stays and how it is used. Check with the local building department in Antioch, and ask your supplier what they normally handle.

Leasing fits a need with an end date, like a renovation, a long construction job, or an enrollment bump. Buying tends to cost less once you expect to use the space for more than three to five years. Ask for both numbers so you can compare them side by side.

How Much Does a Modular Building Cost? (2026 Prices)

Read our full pricing breakdown with daily, weekly, and monthly rates by equipment type.

Read full guide →

Modular Buildings in Nearby Cities

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Antioch Quick Facts

County: Contra Costa
State: California
Metro Population: 302,885
Market Rate: 12% above avg