This 10’x40′ office trailer floor plan shows a 10’x40′ single-wide mobile office with 400 sq ft of floor space. The box is 10’x40′; however, the towing hitch adds about 4′, so the overall length is about 44′. Inside, the layout includes a private office at the left end (10’x10′), an open office with 1 workstations, a single-user restroom (5.5’x6′) in the rear corner, with the toilet on the exterior wall, and a private office at the right end.
The 10’x40′ office trailer floor plan
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10’x40′ office trailer specs at a glance
First, here are the key specs for this 10’x40′ office trailer floor plan, so you can compare it with your site and headcount.
| Box size | 10’x40′ |
| Floor area | 400 sq ft |
| Overall length with hitch | About 44′ (hitch adds about 4′) |
| Sections | 1 (single-wide on its own chassis) |
| Occupancy group | B (business) |
| Code occupant load | About 3 (150 sq ft per person) |
| Desks shown in this layout | 3 |
| 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-1040 |
Room schedule
| Room | Size | Sq ft |
|---|---|---|
| Private office | 10’x10′ | 100 |
| Open office | 20’x10′ overall | 167 |
| Restroom | 5.5’x6′ | 33 |
| Private office | 10’x10′ | 100 |
We measure the rooms to the module lines, so interior walls take a few inches from each room.
How this layout works
- Private office at the left end (10’x10′)
- Open office with 1 workstations
- Single-user restroom (5.5’x6′) in the rear corner, with the toilet on the exterior wall
- Private office at the right end
Like every iModular.com plan, this 10’x40′ 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 10’x40′ 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 job site office with a plan table
- Field office for an inspection or project management team
- Temporary office during a remodel
- Sales office on a new development
Delivery and site setup
A 10’x40′ 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 10′ 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 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:
- 10’x36′ office trailer floor plan – 360 sq ft
- 10’x44′ office trailer floor plan – 440 sq ft
- 8’x40′ office trailer floor plan – 320 sq ft
- 12’x40′ office trailer floor plan – 480 sq ft
- Browse every size in our modular building floor plans library
Buy or rent a 10’x40′ 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 10’x40′ 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.
Get pricing on a 10’x40′ office trailer
New or used, buy or rent. Mention plan OT-1040 and we will price this layout or one close to it.
Call (800) 806-7485 · Matt answers six days a week · Request a price online
Frequently asked questions
How many square feet is a 10’x40′ office trailer?
A 10’x40′ office trailer has 400 sq ft. In this 10’x40′ office trailer floor plan, we measure the 10’x40′ box, so the hitch adds about 4′ to the overall length but no floor space.
How many people can work in a 10’x40′ office trailer?
This layout has desks for 3 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 3.
Does a 10’x40′ 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 10’x40′ 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.
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-1040 · Updated October 29, 2026.