This 12’x40′ restroom building floor plan shows a 12’x40′ modular restroom building with 480 sq ft: a men’s room with 2 toilets and 2 urinals, and a women’s room with 4 toilets. Each side has a full-size ADA compartment, and every fixture sits on an exterior wall.
The 12’x40′ restroom building floor plan
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12’x40′ restroom building specs at a glance
First, here are the key specs for this 12’x40′ restroom building floor plan, so you can compare it with your site and headcount.
| Box size | 12’x40′ |
| Floor area | 480 sq ft |
| Sections | 1 (single module) |
| Men’s fixtures | 2 toilets (1 ADA), 2 urinals, 2 sinks |
| Women’s fixtures | 4 toilets (1 ADA), 2 sinks |
| Access | 18′ ADA ramp with landing |
| HVAC | 1 wall-mount unit on the end wall |
| Plan ID | RB-1240 |
Room schedule
| Room | Size | Sq ft |
|---|---|---|
| Men’s restroom | 20’x12′ | 240 |
| Women’s restroom | 20’x12′ | 240 |
We measure the rooms to the module lines, so interior walls take a few inches from each room.
How this layout works
- Men’s room with 2 toilets (one ADA compartment), 2 urinals and 2 sinks
- Women’s room with 4 toilets (one ADA compartment) and 2 sinks
- All plumbing fixtures on the exterior long walls, with no windows
- 18′ ADA ramp with a 5’x5′ landing shared by both entries
Like every iModular.com plan, this one 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’x40′ restroom building 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 sites and industrial plants
- Schools, parks and event venues
- Restroom space during a remodel
- Temporary or permanent public restrooms
Delivery and site setup
A 12’x40′ restroom building ships as a single module on its own chassis. Because it is wider than 8′-6″, it needs an oversize-load permit for transport. Once it arrives, it also needs a level pad, an ADA ramp and landing at the entry, and water, sewer and power hookups (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:
- 24’x40′ restroom building floor plan – 960 sq ft
- Browse every size in our modular building floor plans library
Buy or rent a 12’x40′ restroom building
iModular.com sells new and used restroom buildings and arranges rentals and leases. In many cases, a used building is the fastest and lowest-cost way to get this size, or one close to it. Learn how to buy a used modular building, or compare financing, leasing and rental.
Get pricing on a 12’x40′ restroom building
New or used, buy or rent. Mention plan RB-1240 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 12’x40′ restroom building?
A 12’x40′ restroom building has 480 sq ft. In this 12’x40′ restroom building floor plan, we measure the 12’x40′ box.
How is a 12’x40′ restroom building delivered?
It ships as one module on its own chassis. Because of its width, the hauler needs an oversize-load permit.
Can I change this 12’x40′ floor plan?
Yes. For example, to adapt this 12’x40′ restroom building floor plan on a new building, we can move walls, doors, windows and restrooms before the factory starts. However, a used building comes with its existing layout, although a contractor can often remove or add interior walls after delivery.
Drawn by iModular.com. Schematic concept, not for construction and not to scale. Final drawings by a licensed professional. Reviewed by Matt Banes · Plan RB-1240 · Updated October 29, 2026.