10×40 Office Trailer For Sale
The 10×40 is the first office trailer size with a real private office in a standard layout — 360 square feet, three to four people, a door that closes. It is also the first size that needs an oversize permit on every move, which is the trade you are making against the 8-foot-wide units below it. Rentals run $300 to $500 per month; used units sell from $10,000.
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10×40 Office Trailer Specifications
| Nominal size | 10×40 |
|---|---|
| Box dimensions | 10 ft × 36 ft |
| Floor area | 360 sq ft |
| Exterior width | 10 ft — oversize load, permit required |
| Working occupancy | 3 to 4 people |
| Typical layout | 1 private office plus open area |
| Restroom | Commonly available |
| Estimated dry weight | 10,000 – 12,000 lbs |
| Tie-downs | 8 |
| Monthly rental | $300 – $500 |
| Buy new | $20,000 – $45,000 |
| Buy used | $10,000 – $25,000 |
360 square feet, not 400. The box measures 10 by 36 — the nominal 40 feet includes a roughly four-foot hitch. This one is worth checking on any quote, because published figures for this size are wrong more often than for any other. Suppliers list it at 400 square feet and then describe a layout that adds up to 350.
How Much Does A 10×40 Office Trailer Weigh?
Expect roughly 10,000 to 12,000 pounds empty. This is an estimate — no manufacturer publishes a dry weight for this size, and the range is scaled from published figures for narrower units of similar length.
| Size | Published Dry Weight | Source |
|---|---|---|
| 8×32 | 7,500 lbs | Williams Scotsman |
| 8×40 | 8,554 lbs | Mobile Modular |
| 10×40 | 10,000 – 12,000 lbs (estimated) | Scaled for width |
| 12×64 | 16,000 lbs | Williams Scotsman |
The 10-foot width adds roughly a quarter more floor, roof and frame than an 8×40, plus a heavier chassis to carry it, which is where the estimate comes from. Treat it as a planning number and get the actual figure from the data plate or spec sheet before booking transport — it varies by several hundred pounds between manufacturers and moves further with a plumbed restroom or a second HVAC unit.
Where the weight actually bites: at this point you are past what a one-ton pickup handles casually and into dedicated transport, which is one of the reasons delivery on a 10×40 costs meaningfully more than on an 8-foot-wide unit. It also drives the ground bearing your pad needs and whether site equipment can reposition the unit once it is set.
The First Size That Needs A Permit
Legal load width in most states is 8 feet 6 inches. At 10 feet, the 10×40 crosses it, and that changes every move:
- An oversize permit is required, issued per state — so a multi-state delivery needs one from each.
- A route survey is usually part of it: turning radius, overhead clearance, weight-restricted bridges on the approach.
- Restricted travel hours in some jurisdictions, typically daylight only and not on holiday weekends.
- Longer lead time than an unpermitted move, because the permit has to be pulled before the truck rolls.
Escorts are a separate question and usually not required. Most states set the escort threshold well above 10 feet — Texas, for example, requires none until 14 feet. A delivery quote that adds a pilot car charge for a 10-foot-wide unit is worth questioning.
The real comparison is against the 8×36. That unit gives 256 square feet and moves permit-free; the 10×40 gives 360 and needs a permit on every relocation. On a single placement for one project, the permit is a one-time cost and the extra 104 square feet usually wins. On a trailer that follows a crew between jobs, the permit lands every time and the 8×36 often makes more sense.
Layouts And What Fits
360 square feet is the threshold where a private office stops being a compromise. The standard stock layout is one enclosed office plus an open area, and at 10 feet wide there is enough depth to put a desk against the back wall of the office without the door hitting it — which a 12-foot-wide unit does better and an 8-foot-wide unit cannot do at all.
| Configuration | Suits |
|---|---|
| 1 private office plus open area | The standard stock layout. Superintendent gets a door, the rest share |
| Open plan throughout | A single crew working together; most flexible, no privacy |
| Office plus restroom plus open | Costs roughly 50 to 70 sq ft and needs a sewer, septic or tank connection |
| Office plus storage partition | Less common at this size than on the 8×36, but available |
What 360 Square Feet Holds
Against a normal planning figure of 50 to 75 square feet per open-plan workstation and 100 to 150 for a private office:
| People | Square Feet Each | In Practice |
|---|---|---|
| 3 | 120 | Comfortable. One in the private office, two in the open area with a plan table |
| 4 | 90 | Works. The realistic upper limit for daily desk use |
| 5 | 72 | Tight, and the private office is what has to go |
Beyond four daily occupants, the 12×60 at 672 square feet is the next step, and it is a large one — nearly double the floor for roughly the same delivery constraints, since both need the same permit.
Should You Rent Or Buy A 10×40?
Renting
$300 to $500 per month, with the low end realistic only on a longer term. Delivery, set, blocking and leveling, steps and skirting are separate — and on a permitted load, delivery is a larger line than it would be on an 8-foot-wide unit.
Buying
$20,000 to $45,000 new and $10,000 to $25,000 used. The new range is unusually wide for a single size because the 10×40 sits at the boundary between basic job-site specification and finished commercial interior, and the two are priced very differently.
Break-even is about 44 months. A mid-range $400 per month against a mid-range $17,500 used purchase crosses over near the 44th month, before counting resale. That is longer than both the 8×20 at roughly 21 months and the 12×60 at 30, which makes the 10×40 the size where renting holds its advantage longest. On anything under three years, rent.
On a used unit, check the floor near the door and under the windows for soft spots, the age of the HVAC, and the roof. Our office trailers for sale guide covers the full inspection list.
Delivery And Site Requirements
- Oversize permit on every move, per state. Pull it before scheduling the truck, not after.
- Clearance for 40 feet of trailer plus the tractor, not 36. Plan the swing room to position it.
- A firm, level pad the full length. A 36-foot box shows a grade that a short unit hides, and re-leveling a set trailer is a callout.
- Eight tie-downs is typical. High-wind and coastal counties may require more.
- Typically a 100-amp service, sometimes more with a second HVAC unit. Confirm the panel spec against the site supply.
- Steps and a landing, and a ramp if the public or inspectors will enter.
10×40 Office Trailer FAQ
How much does a 10×40 office trailer weigh?
Roughly 10,000 to 12,000 pounds empty. That is an estimate rather than a published figure — no manufacturer publishes a dry weight for this size, so it is scaled from Mobile Modular’s 8×40 at 8,554 pounds and Williams Scotsman’s 12×64 at 16,000, adjusting for the extra width and the heavier chassis. Get the actual number from the data plate before booking transport.
How big is a 10×40 office trailer?
360 square feet. The box measures 10 feet by 36, not 40, because the nominal length includes a roughly four-foot hitch. This size is misreported more often than any other — suppliers commonly list 400 square feet and then describe a floor plan that adds up to about 350.
Does a 10×40 office trailer need an oversize permit?
Yes, on every move. At 10 feet wide it exceeds the 8-foot-6-inch legal load width used in most states, so each move needs a permit, usually a route survey, and sometimes restricted travel hours. Escorts are a separate question and generally are not required at this width — Texas, for instance, requires none until 14 feet.
How many people fit in a 10×40 office trailer?
Three to four for daily desk use. Three is comfortable at 120 square feet each, with one person in the private office and two in the open area alongside a plan table. Four works at 90 each. Five is tight and the private office is usually what gets sacrificed.
Is it cheaper to rent or buy a 10×40 office trailer?
Break-even lands around 44 months, comparing a mid-range $400 monthly rental against a mid-range $17,500 used purchase, before resale value. That is the longest crossover of any common size — longer than the 8×20 at about 21 months and the 12×60 at 30 — so on any project under three years, renting is the better call.
What is the difference between an 8×36 and a 10×40?
Floor area and permits. The 8×36 gives 256 square feet and moves at legal width with no oversize permit; the 10×40 gives 360 and needs a permit on every relocation. For a single placement the extra space usually wins. For a trailer that follows a crew between jobs, the repeated permit cost often makes the 8×36 the better economics.
Can a 10×40 office trailer have a bathroom?
Yes, and restroom-equipped units are commonly stocked at this size, unlike the 8-foot-wide range. Expect it to consume roughly 50 to 70 square feet and to need a sewer or septic connection, or a holding tank on a pumping schedule. On short construction projects many contractors skip it and pair the trailer with portable toilets instead.
Compare 10×40 Office Trailer Quotes
Tell us whether you are renting or buying and where the trailer is going, and we will connect you with suppliers who stock this size. Because delivery on a permitted load varies by route and by state, comparing the full delivered price rather than the monthly rate is what shows the real difference. There is no cost and no obligation.
Related Guides
- 8×36 Office Trailer — the largest permit-free size
- 12×60 Office Trailer — the next step up at 672 square feet
- Office Trailer Rental — rates and lease terms across every size
- Office Trailers For Sale — new and used pricing, what to inspect