Finance

What are indirect costs in construction?

Indirect costs are expenses that support more than one job, or the whole company, so they cannot be traced straight to a single project. Contractors recover them by allocating them across jobs or building them into markup.

An office manager and contractor review invoices with a calculator and laptop in a construction office.
Review invoices, committed costs, and cash timing together before making project decisions. AI-generated illustration.

Indirect costs are the costs of running a construction business that do not belong to any one job. Office rent, the controller's salary, estimating software, the shop, the yard, and the owner's truck all fall here. They are the opposite of direct costs, which you can charge straight to a job's cost codes. Every dollar of indirect cost still has to be paid by some job, which is why how you allocate them decides whether your bids are priced right.

Federal contracting rules use a similar idea. FAR 31.203 describes indirect costs as costs left to be allocated to two or more cost objectives after direct costs are charged, and says they should be grouped logically and spread on a base that reflects the benefit each job receives.

Two layers of indirect cost

  • Company overhead. Costs that keep the doors open no matter how many jobs are running: office staff, rent, accounting, insurance not tied to payroll, marketing. Most contractors recover this through an overhead rate or markup.
  • Shared field costs. Costs that serve several jobs but not the office: a superintendent splitting time across three sites, a shared crane, small tools, the equipment shop. These are often pooled and charged to jobs by hours, days, or labor dollars.

Owners sometimes call a GC's site supervision and trailer "indirect" on their side of the budget. Inside the contractor's books, though, job-specific supervision on one site is usually charged to that job as general conditions. Be clear about whose definition you are using.

Worked example: allocating indirects

Say a mechanical contractor expects $9,000,000 in revenue next year and $1,080,000 in company overhead. It also runs a fabrication shop costing $240,000 a year, shared across jobs. The company decides to recover overhead as a percentage of direct cost and the shop by fabrication hours.

Example allocation of indirect costs
PoolAnnual costBaseRate
Company overhead$1,080,000$7,200,000 expected direct cost15% of direct cost
Fabrication shop$240,0006,000 shop hours$40 per shop hour

A job with $400,000 of direct cost and 300 shop hours picks up $60,000 of overhead and $12,000 of shop cost before any profit. If the estimator only marks up for profit, the job looks fine on paper and quietly loses money. The guide on how to calculate construction overhead rate covers the math in more depth.

Common mistakes

  1. Using last year's rate with a smaller backlog. Fixed overhead spread over less volume means a higher rate. Recheck it when revenue changes.
  2. Dumping shared field costs into overhead. It hides which jobs actually used the crane or the shop.
  3. Charging indirects to a job in the job cost report and then marking up for them again in the bid. That double counts.
  4. Inconsistent bases. Switching from labor dollars to direct cost mid-year makes job margins impossible to compare.
  5. Treating labor burden as overhead. Payroll taxes and benefits on field labor belong with the labor, on the job.

Related terms

See hard costs, burden rate, markup, and job costing. For the annual planning side, read how to budget overhead in a contracting business. Smart Business Automator's job costing views keep direct costs on the job and show margin before and after overhead, so the true profit on each job is visible; see job costing and WIP automation.

Frequently asked questions

What is the difference between direct and indirect costs?

Direct costs can be traced to one job, like the drywall sub on that project. Indirect costs support several jobs or the whole company, like office rent, and have to be allocated.

Are indirect costs the same as overhead?

Overhead is the biggest part of indirect cost, but indirect costs can also include shared field costs, like a shop or yard, that are allocated to jobs separately from company overhead.

How do contractors recover indirect costs?

Usually through a markup percentage on bids, an overhead rate applied to direct cost or labor, or hourly charges for shared resources like equipment and shops.

Can indirect costs be billed on federal contracts?

On cost-type federal contracts, allowable indirect costs are allocated under FAR Part 31 rules. On fixed-price work they are simply priced into the bid.

Sources

  1. Acquisition.gov: FAR 31.203, Indirect costs
Written and edited by

Maurice Francois writes and edits construction operations guides for Smart Business Automator. More from Maurice on the Scaling Legends podcast.

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