Hidden Travel Costs on Construction Projects

I’ve lost count of how many “profitable” projects turned ugly the moment we added up travel, per diem, and downtime. On paper, the bid looked tight. In reality, travel pay quietly ate the margin.

If you run construction or field projects, you’re probably feeling it too. Crews are traveling farther. Hotels cost more. Rules keep changing. And the hidden travel costs you’re not planning for are usually the ones that blow up your job.

Let’s walk through the big three that sink a lot of field crew travel budgets: per diems, overtime tied to travel, and paid downtime when crews are stuck away from home.

1. Are You Treating Per Diem Like Free Money?

Most contractors I talk to treat per diem like a casual stipend: “We just give the guys an extra $75 a day when they’re out of town.” It feels simple. It’s not.

Per diem is supposed to be a reimbursement, not a bonus. Under IRS rules, it can be tax-free if you structure it under an accountable plan and stay within federal benchmarks like the GSA rates. If you don’t, that “simple” per diem quietly turns into taxable wages with payroll tax, overtime, and certified payroll implications.

Here’s the basic reality on travel cost planning for construction companies:

• Per diem covers lodging and/or meals & incidental expenses (M&IE) when workers are away from their tax home.
• For FY 2025, the standard GSA rates are about $110/night for lodging and $68/day for M&IE in most areas, with higher limits in roughly 300 high-cost locations (source).
• First and last travel days are only 75% of the M&IE rate, not the full amount.
• If you pay above those rates without receipts, or you don’t track time/place/purpose, the IRS can treat the excess (or all of it) as taxable wages.

On public works and prevailing wage jobs, per diem is often required and becomes part of the overall compensation package. That means mistakes don’t just annoy your accountant; they can trigger wage theft claims, certified payroll violations, and back taxes.

So you’ve got a choice to make on your next construction bid travel and per diem setup:

Decision to make: Are you going to treat per diem as a casual add-on, or as a structured, documented reimbursement plan that protects your margin and keeps the IRS off your back?

2. Are You Budgeting for the Real Cost of Housing and Food?

Let’s be blunt: a lot of per diem rates in construction are fantasy numbers. They’re based on what the company wishes it could pay, not what it actually costs to live on the road.

Look at the current landscape if you’re serious about a realistic construction per diem cost breakdown:

• Average U.S. hotel rates are in the mid-$150s to ~$160/night in many markets.
• Extended-stay options hover around $120/night on average, and that’s before taxes, parking, and fees.
• A basic weekly stay can easily hit $850+ per room.
• Temporary housing and furnished apartments in business hubs are often even higher, especially for 4–12 week assignments.

Now compare that to what you’re actually paying. If your all-in per diem is in the $100–$150/day range, you’re likely below federal benchmarks in many markets once you factor in taxes and ancillary costs (source).

In practice, most companies fall into one of two models when estimating travel expenses for construction crews:

1. Company books housing and pays M&IE only.
   This is often the cleanest approach. You control lodging costs and just pay the GSA M&IE rate (with the 75% rule on first/last day). No double-paying for lodging, easier to justify in an audit, and workers know their meals budget.
2. All-in stipend (crew self-houses).
   Here, the IRS high-low method is a useful anchor. For FY 2025, the high-cost locality rate is around $319/day and the standard is about $225/day. If you’re far below that, your crews are probably subsidizing the project out of their own pockets.

Decision to make: Are your per diem numbers based on current market costs and GSA/IRS benchmarks, or on what you were paying five years ago?

3. When Does Travel Time Turn Into Overtime?

Travel time is where many contractors accidentally give away money or, worse, underpay and invite claims.

Here’s the uncomfortable truth: not all travel is created equal. Some of it is clearly compensable work time. Some of it isn’t. And the line is not always intuitive when you’re dealing with construction overtime and travel time.

In general (and you should always check your state law, union CBA, and specific contract):

• Travel that happens during the workday at your direction is usually paid time.
• Travel between job sites in the same day is typically compensable.
• Ordinary home-to-work commuting is usually not paid.
• On prevailing wage jobs, the wage determination or CBA may require travel time pay and mileage beyond certain distances.

Now layer in overtime. If travel time is compensable, it also counts toward weekly hours. That means:

• Long drive to a remote site on Monday? Those hours may push a worker into time-and-a-half later in the week.
• Weekend mobilization? You might be paying overtime rates for travel before a single tool hits the ground.

On a six-month out-of-area project, per diem and travel-related costs can easily reach $20,000–$30,000 per worker (source). If you’re not modeling travel time and overtime correctly in your bid, you’re guessing with your profit.

Decision to make: Do you have a written, defensible rule for when travel is paid, how it counts toward overtime, and how that ties into prevailing wage or union rules?

4. The Downtime Trap: Paying People to Wait Around

Here’s a cost that almost never shows up in the estimate: paid downtime when crews are stuck out of town with nothing to do.

Think about scenarios like:

• Weather shuts down the site for two days.
• The GC or owner delays access to an area.
• Materials are late, inspections slip, or another trade is in your way.

When your crew is local, you might send them to another job or send them home. When they’re living in a hotel three states away, that’s not so simple. You may still be on the hook for:

• Per diem (they’re still away from home).
• Minimum guaranteed hours under a CBA or company policy.
• Travel costs if you decide to demobilize and remobilize.

Federal acquisition rules even recognize this reality. Under the FAR (31.205-46), travel costs are only allowable if they’re reasonable and properly documented. Partial travel days often require downward adjustments to per diem. That same logic applies to your own internal policies: if you’re paying full per diem for days when workers are barely on site, you’re bleeding cash.

Managing downtime on remote field work is part of the job now, not an exception.

Decision to make: What’s your rule for downtime on the road? Do you pay full per diem? Reduced per diem? Minimum hours? And have you priced that risk into your bid?

5. Tax Landmines: When Per Diem Becomes Wages

This is where a lot of “simple” per diem policies go to die: tax compliance.

Per diem is only tax-free if it meets IRS accountable plan requirements. That means:

• There’s a clear business purpose for the travel.
• You document time, place, and business purpose for each trip.
• Employees return any excess payments or you cap them at IRS/GSA rates.

If you pay per diem as a flat add-on, don’t track anything, or routinely exceed GSA rates without receipts, the IRS can say: This isn’t reimbursement. It’s wages.

When that happens:

• The per diem becomes subject to income tax withholding and FICA.
• Your labor cost jumps because you’re now paying employer payroll taxes on that money.
• On certified payroll, you must include taxable per diem in gross wages, which can affect fringe calculations and Davis-Bacon/prevailing wage compliance (source).

Auditors love this area. They look for:

• Missing or sloppy travel logs.
• Per diem rates that don’t match GSA tables.
• Inconsistent treatment between projects or crews.
• Multi-state issues (e.g., California’s stricter rules on what’s taxable).

For construction companies, this is where a loose per diem vs reimbursed expenses construction policy can turn into a real problem.

Decision to make: Are you willing to keep treating per diem casually and hope you never get audited, or will you invest in a clean, documented accountable plan that keeps reimbursements tax-free?

6. Policy vs. Chaos: Who Actually Controls Travel Pay?

In many companies, travel pay decisions are made by whoever yells the loudest: a superintendent promising a crew extra cash to get them to a remote job, a PM trying to save a bid, or HR trying to clean up the mess after the fact.

That’s how you end up with:

• Different per diem amounts for the same job.
• Some managers paying per diem inside payroll, others cutting checks off-cycle.
• Overtime calculated on base wages only, ignoring taxable stipends.
• Workers comparing notes and feeling burned.

A better approach is boring but powerful:

1. Write a clear travel policy.
   Spell out what’s covered (lodging, meals, incidentals), when per diem applies, how rates are set (GSA, IRS high-low, or CBA), and how first/last day rules work.
2. Align it with the law.
   Cross-check against prevailing wage determinations, union CBAs, state labor laws, and IRS rules. They can all apply at once.
3. Train your field leaders.
   Superintendents and foremen need to know what they can and can’t promise. A 20-minute training can save you thousands.
4. Use tools, not spreadsheets.
   Mobile apps and integrated systems make it easier to track dates, locations, and business purpose, and to sync with payroll and accounting (source).

In other words, your field technician travel pay policies shouldn’t be negotiated in the parking lot.

Decision to make: Will travel pay be driven by policy or by ad hoc deals made in the field?

7. How to Build Travel Costs Into Your Next Bid (So You Don’t Regret It Later)

Let’s bring this down to something you can use on your next estimate. When I review bids now, I force myself to answer a few uncomfortable questions before I call the number final.

For each traveling worker, ask:

• How many days away from home will they realistically be on this job?
• What’s the local GSA rate for lodging and M&IE in that county/city?
• Are we booking housing or paying an all-in stipend?
• How many hours of compensable travel will they log per week, and how much of that will hit overtime?
• What’s our realistic downtime risk (weather, access, other trades)?
• Which rules apply: prevailing wage, union CBA, state law, federal contract rules?

Then I build a simple model for the field crew travel budget:

1. Per diem cost per day × days away from home.
2. Estimated travel hours per week × wage rate (with overtime where it applies).
3. Reasonable allowance for downtime (even 5–10% of labor hours can be eye-opening).
4. Payroll tax impact if any per diem is likely to be taxable.

When you do this honestly, you’ll see why so many remote jobsite travel and lodging costs end up in the $20k–$30k in travel-related cost per worker range. It’s not because anyone is stealing. It’s because the original bid pretended those costs didn’t exist.

Decision to make: On your next bid, are you going to price travel like a real cost, or keep treating it like a rounding error?

Final Thought: Travel Is a Scope Item, Not a Footnote

Per diem, overtime on travel, and downtime aren’t side issues. They’re part of the scope. If you don’t define them, someone else will—your workers, your union, your client, or the IRS.

If you take nothing else from this, take this:

• Use GSA and IRS benchmarks as your floor, not your ceiling.
• Treat per diem as a reimbursement with rules, not a casual bonus.
• Decide, in writing, when travel is paid and how it hits overtime.
• Price downtime risk into your bid instead of pretending it won’t happen.

The projects that survive tight margins aren’t always the ones with the lowest number. They’re the ones where the contractor actually understood what it costs to keep people on the road—and built those hidden travel costs on construction projects into the bid from day one.