36’x40′ Modular Building Floor Plan: How to Make the Most of 1,440 Sq Ft

This 36’x40′ modular building floor plan shows a 36’x40′ triple-wide commercial modular building with 1,440 sq ft. In addition, it has 3 private offices, an open office, two single-user ADA restrooms and an accessible entry with an 18′ ramp. Because the code counts business (B) space at 150 sq ft per person, its code occupant load is about 10.

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

The 36’x40′ modular building floor plan

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36’x40′ modular building specs at a glance

First, here are the key specs for this 36’x40′ modular building floor plan, so you can compare it with your site and headcount.

Room schedule

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

How this layout works

• 3 private offices (12’x12′ each) along the end walls
• Open office of about 889 sq ft with 7 workstations shown
• Two single-user ADA restrooms (7’x8′-6″) on the rear exterior wall
• ADA ramp (18′) with a 5’x5′ landing at the main entry, plus a rear exit with steps

Like every iModular.com plan, this 36’x40′ modular building floor plan follows a few rules: wall-mount HVAC units sit on the end wall, one per module, 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 36’x40′ modular 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.

• Multi-department office buildings
• Corporate or plant headquarters on an industrial site
• Government and agency offices
• Training and meeting space with private offices
• Medical office suites

Delivery and site setup

A 36’x40′ modular building comes as 3 modules, each 12’x40′. Each module ships on its own truck, so delivery takes 3 truckloads. First, the crew sets the modules on the foundation. Then they join them along the marriage lines (the dashed lines on the plan) and finish the seams inside and out. Foundation options include steel piers with tie-downs or a perimeter foundation (compare foundation systems). Finally, the crew adds the ADA ramp and landing (ramp slope and landing rules).

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:

• 36’x56′ modular building floor plan – 2,016 sq ft
• 36’x60′ modular building floor plan – 2,160 sq ft
• 24’x40′ modular building floor plan – 960 sq ft
• 48’x40′ modular building floor plan – 1,920 sq ft
• Browse every size in our modular building floor plans library

Buy or rent a 36’x40′ modular building

iModular.com sells new and used modular 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. In California, see our stock modular buildings.

Frequently asked questions

How many square feet is a 36’x40′ modular building?

A 36’x40′ modular building has 1,440 sq ft. In this 36’x40′ modular building floor plan, we measure the 36’x40′ box.

How many people can work in a 36’x40′ modular building?

This layout has desks for 10 people (3 private offices and 7 open workstations). 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 10.

How is a 36’x40′ modular building delivered?

It ships as 3 modules on 3 trucks. First, the crew sets them on the foundation. Then they join them at the marriage lines and finish the seams.

Can I change this 36’x40′ floor plan?

Yes. For example, to adapt this 36’x40′ modular 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 MB-3640 · Updated October 29, 2026.