Buying Advice
Office Trailer Sizes and Floor Plans: 8×20 to Triple-Wide
Sizing mistakes cost real money in both directions: undersize and you pay for a mid-project swap with two haul charges; oversize and you rent square feet nobody uses. The math below gets it right the first time.
The 100 square foot rule
Give every regular occupant about 100 sq ft. That sounds generous for a desk, but it absorbs circulation, storage, the printer table, and the fact that HVAC sizing follows the same arithmetic. Then add function space on top:
- Plan table: 40+ sq ft
- Meeting space for six: 120+ sq ft
- Restroom: about 25 sq ft
- Secure storage: 20 to 60 sq ft
Two people plus a plan table lands you at roughly 280 sq ft, which is why the 8×24 and 10×40 dominate small-project rentals.
The standard sizes
| Size | Sq Ft | Comfortable Occupancy | Typical Monthly |
|---|---|---|---|
| 8×20 | 160 | 1–2 | $250–$500 |
| 8×24 | 192 | 2 | $300–$550 |
| 10×40 | 400 | 3–4 | $400–$700 |
| 12×44 | 528 | 4–5 | $450–$800 |
| 12×60 | 720 | 5–7 | $500–$900 |
| 24×60 | 1,440 | 8–14 | $700–$1,200 |
Widths are nominal; interior dimensions run slightly less after walls. Lengths include the hitch on some manufacturers’ spec sheets, so confirm interior footage on the quote.
Floor-plan logic by size
8×20 and 8×24: the one-room office. Desk, files, plan surface, coffee. The 24 earns its extra $50/mo the first time two people spread drawings at once.
10×40: one wall, two rooms. The classic split is a private office plus an open plan room. This is the smallest unit where a meeting happens behind a door.
12×44 and 12×60: the team layout. Two or three private offices, an open area, and a restroom becomes practical (water and sewer connections required). The 12-wide feels different from the 10-wide; it is the difference between a corridor and a room.
24×60 double-wide: the project HQ. Arrives as two halves joined on site. Conference room, multiple offices, restrooms, and a real entrance. This is also the standard footprint for portable classrooms and clinic configurations.
Triple-wide and modular complexes: anything a spec sheet can describe, quoted custom, and worth involving our team early because engineering and permits scale with the footprint.
Site realities that override the math
Placement space. A 24×60 needs roughly a 30×70 ft pad plus truck access and room to maneuver each half. Tight urban sites often step down to a 12×60 single for this reason alone.
Access route. The truck needs about 12 ft of width, firm ground, and overhead clearance the whole way in. A perfect unit that cannot reach the pad is the wrong unit.
Power. Bigger units want bigger service. Confirm what your temporary power or building connection supplies before falling in love with a double-wide.
When between two sizes
Take the bigger one. The rate difference between adjacent sizes runs $50 to $150/mo, and cramped project offices cost more than that in friction. Nobody has ever ended a project wishing the meeting room were smaller.
Common layouts by crew size
If you would rather start from people than dimensions, these are the configurations we place most often:
- 1 to 2 people: an 8×20 or 8×24 single office. Desk, files, plan surface, coffee. The 24 pays for itself the first time two people spread drawings at once.
- 3 to 5 people: a 10×40 or 12×44 with one or two private offices and an open area. This is the small-project workhorse, and the point where a restroom becomes practical.
- 6 to 8 people: a 12×60 with multiple offices, or step up to a double-wide if meetings happen on site more than weekly.
- 8 to 14 people: the 24×60 double-wide: several offices, a real conference room, restrooms. Also the standard classroom and clinic footprint.
- More than that: modular complexes, quoted custom, and worth a conversation before a form.
Know your size? Quote it below and written quotes for your ZIP code usually come back within the hour.