12’x64′ Office Trailer Floor Plan: How to Make the Most of 768 Sq Ft

This 12’x64′ office trailer floor plan shows a 12’x64′ single-wide mobile office with 768 sq ft of floor space. The box is 12’x64′; however, the towing hitch adds about 4′, so the overall length is about 68′. Inside, the layout includes a conference room at the left end (12’x12′), an open office with 4 workstations, a kitchenette counter with sink and microwave space on the rear wall, a single-user restroom (5.5’x6′) in the rear corner, with the toilet on the exterior wall, and a manager office at the right end.

By Matt Banes, President of iModular.com · 38 years in commercial modular buildings

The 12’x64′ office trailer floor plan

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12’x64′ office trailer specs at a glance

First, here are the key specs for this 12’x64′ office trailer floor plan, so you can compare it with your site and headcount.

Box size	12’x64′
Floor area	768 sq ft
Overall length with hitch	About 68′ (hitch adds about 4′)
Sections	1 (single-wide on its own chassis)
Occupancy group	B (business)
Code occupant load	About 6 (150 sq ft per person)
Desks shown in this layout	5
Restroom	Single-user restroom
Exterior doors	2, each with steps
Access	Steps (most codes do not require a ramp on a job site trailer)
HVAC	1 wall-mount unit on the end wall
Plan ID	OT-1264

Room schedule

Room	Size	Sq ft
Conference room	12’x12′	144
Open office	40’x12′ overall	447
Restroom	5.5’x6′	33
Manager office	12’x12′	144

We measure the rooms to the module lines, so interior walls take a few inches from each room.

How this layout works

• Conference room at the left end (12’x12′)
• Open office with 4 workstations
• Kitchenette counter with sink and microwave space on the rear wall
• Single-user restroom (5.5’x6′) in the rear corner, with the toilet on the exterior wall
• Manager office at the right end

Like every iModular.com plan, this 12’x64′ office trailer floor plan follows a few rules: wall-mount HVAC units sit on the end wall, and that wall has no windows; toilets and sinks are on exterior walls, which keeps plumbing runs short and costs down; restrooms have no windows. Also, every layout can change. For example, we can move walls, doors and fixtures before the factory builds a new building, and a contractor can often remodel a used one after delivery.

What a 12’x64′ office trailer is used for

For example, buyers often choose this layout for uses like these. However, the same layout works for many other jobs, too.

• Construction and project management offices
• Real estate and new-home sales offices
• School and government administration space during construction
• Temporary branch or clinic office

Delivery and site setup

A 12’x64′ office trailer rides on its own steel chassis with axles and a hitch, so a truck tows it to the site in one piece. However, at 12′ wide it is wider than the 8′-6″ legal limit, so the hauler pulls an oversize-load permit for each state on the route. Once it arrives, the crew levels it on piers or blocks, anchors it with tie-downs and adds steps at each door. However, utility hookups are by others.

As a result, the site work for this building usually comes down to a level pad, a foundation, utility hookups and access. Also, ask your city or county early, because local permits often set the schedule.

Approvals where you are

In short, the building in this 12’x64′ office trailer floor plan is the same everywhere. Instead, what changes is the state program that approves it and how your city or county permits the site work. For example, in California the Department of Housing and Community Development (HCD) approves commercial modular buildings (California prices and guides). In Texas, the TDLR Industrialized Housing and Buildings program covers them (Texas guide). Similarly, Florida uses the DBPR manufactured buildings program (Florida guide). Either way, iModular.com brokers modular buildings nationwide. Read how permits work for modular buildings.

Compare nearby sizes

Also, if this size is close but not quite right, compare these nearby sizes:

• 12’x60′ office trailer floor plan – 720 sq ft
• 12’x56′ office trailer floor plan – 672 sq ft
• 14’x64′ office trailer floor plan – 896 sq ft
• 24’x64′ modular building floor plan – 1,536 sq ft
• Browse every size in our modular building floor plans library

Buy or rent a 12’x64′ office trailer

iModular.com sells new and used office trailers and arranges rentals and leases. In many cases, a used building is the fastest and lowest-cost way to get this 12’x64′ office trailer floor plan, or one close to it. Learn how to buy a used modular building, or compare financing, leasing and rental. In California, see our stock mobile office trailers.

Frequently asked questions

How many square feet is a 12’x64′ office trailer?

A 12’x64′ office trailer has 768 sq ft. In this 12’x64′ office trailer floor plan, we measure the 12’x64′ box, so the hitch adds about 4′ to the overall length but no floor space.

How many people can work in a 12’x64′ office trailer?

This layout has desks for 5 people. However, for exits and restrooms, the building code counts business (B) space at 150 sq ft per person, which gives a code occupant load of about 6.

Does a 12’x64′ office trailer need a ramp?

Usually not. Most codes do not require a ramp on a job site office trailer, so this plan shows steps. However, if the trailer will serve the public, such as a sales or school office, plan on an ADA ramp and landing.

Can a 12’x64′ office trailer have a restroom?

Yes. In fact, this layout includes a single-user restroom in the rear corner, with the toilet on the exterior wall. Also, plan on water and sewer hookups on site.

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Drawn by iModular.com. Schematic concept, not for construction and not to scale. Final drawings by a licensed professional. Reviewed by Matt Banes · Plan OT-1264 · Updated October 29, 2026.