CAT CLASS: HQ-10888

320-600 sq ft Mobile Office Trailer

The 320-600 sq ft mobile office trailer is the standard site office configuration in the rental industry, typically appearing as 10×40 or 12×40 units. This size class accommodates dedicated desk areas, a meeting corner, and often includes a restroom, making it the workhorse solution for long-term construction sites and temporary facility needs. It sits between smaller single-room offices (up to 320 sq ft) and larger multi-room complexes (600-1,440 sq ft).

192

Models

Brands

Cat classes

Pick a size class: capacity and reach differ across the range.

Key specifications

Specification	Typical range	What it means
Floor area	320-576 sq ft	Standard 10×32 to 12×48 footprints, accommodating multiple workstations and a meeting area
Maximum height	32–54 ft (9.8–16.5 m)	Length measurement for transport planning and site layout; most units fall in the 40-48 ft range
Common configurations	10×40, 12×40, 12×48	Industry-standard trailer dimensions that fit highway transport regulations
Typical interior layout	3-5 zones	Office area, meeting space, restroom, and optional kitchenette or storage

How to choose

This size class serves sites requiring a dedicated office with separation between workstations and meeting areas, typically supporting 2-4 simultaneous occupants. For single-superintendent sites with minimal administrative needs and no meeting requirements, the up to 320 sq ft band offers a more compact footprint and simpler placement. When a site demands separate offices for multiple trades, dedicated conference rooms, or break rooms distinct from the office area, the 600-1,440 sq ft mobile office trailer provides the necessary compartmentalization and capacity.

What this size handles

General contractor field office on commercial construction lasting 6-18 months
Highway or infrastructure project office with restroom for DOT inspectors and engineering staff
Utility substation expansion requiring secure office and parts storage under one roof
School addition project office with separate meeting area for owner-contractor coordination
Industrial maintenance turnaround office supporting shift supervisors and planning personnel
Pipeline or transmission-line construction with desk space and crew briefing area

Safety & operation

Egress doors at both ends required by most jurisdictions; verify local fire code for exit signage and emergency lighting
Anchoring to foundation or tie-downs necessary in high-wind zones; chassis alone does not satisfy stability requirements
HVAC units and electrical panels require clearance for service access; site layout must account for maintenance zones
Interior ADA compliance varies by jurisdiction and contract terms; verify accessibility requirements before placement

Transport & logistics

Delivered via tractor-trailer or heavy-duty tow vehicle; most units require commercial transport due to length exceeding 40 ft
Site must provide level, compacted pad or blocking to support distributed floor load; units typically delivered on integral chassis
Crane or forklift placement rarely required; units positioned via towing and jacking onto permanent blocks or piers

Power & supply

Standard 100-200 amp single-phase electrical service for HVAC, lighting, and office equipment; hardwired connection typical for long-term installations
Generator hookup feasible for remote sites; units draw 8-15 kW under normal occupancy with climate control operating
Utility tie-in for water and sewer when restroom is included; holding tanks available for sites without municipal connections

Frequently asked

What distinguishes a 320-600 sq ft unit from smaller mobile offices?

This size class provides distinct zones, typically a primary office area, a separate meeting or break space, and an integrated restroom, whereas units under 320 sq ft function as single-room offices with limited or external facilities.

How many workstations fit in a typical 12×40 trailer?

Most 12×40 configurations accommodate 3-5 desks or workstations, with layout depending on restroom size, storage needs, and whether a meeting table or plan-review area is included.

Can these units be stacked or joined for larger facilities?

Many manufacturers design this size class for modular expansion; units can be placed side-by-side with breezeway connectors, though stacking typically requires engineering certification and is more common in the 600+ sq ft size classes.

Compare popular models

Find by spec →

Normalised to the same units. A dash means the figure was not published.

Model	Load capacity	Max height
Pac-Van 8 x 40 Mobile Office with 1 Office and 1 Main Office	-	40 ft (12.2 m)
Pac-Van 8 x 40 Mobile Office with 1 Restroom, 1 Office and 1 Main Office	-	40 ft (12.2 m)
Pac-Van 10 x 32 Mobile Office Units	-	32 ft (9.8 m)
Pac-Van 10 x 36 Mobile Office with 1 Private Office and 1 Main Office	-	36 ft (11.0 m)
Pac-Van 10 x 40 Mobile Office with 1 Private Office and 1 Main Office	-	40 ft (12.2 m)
Pac-Van 10 x 40 Mobile Office with Open Floor Plan	-	40 ft (12.2 m)

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Browse by manufacturer

Pac-Van 17 Triumph Modular 3 Champion Homes 1

Sources

Every specification is verified against the manufacturer's published data, with the source linked for reference.

championhomes.com ↗pacvan.com ↗triumphmodular.com ↗

320-600 sq ft Mobile Office Trailer

21 models · Every spec cited to source

Pac-Van 8 x 40 Mobile Office with 1 Office and 1 Main Office