Construction Overhead Allocation Methods | Gurian CPA

Construction overhead allocation is the process contractors use to spread indirect costs, such as office rent, administrative salaries, and insurance, across individual jobs so bids and job cost reports reflect what a project actually costs to deliver. Without a defined allocation method, contractors underprice bids, misjudge which jobs are genuinely profitable, and set overhead rates by guesswork instead of calculation. Gurian CPA builds overhead allocation methods for general contractors and specialty subcontractors across the Dallas and Houston markets, tying every allocation decision to job costing data that estimators can use directly during bid preparation.

What Qualifies as Overhead in a Construction Company?

Construction overhead falls into two distinct categories, and mixing them up is one of the most common construction indirect costs mistakes we see in job cost reports. General conditions are project-specific indirect costs tied to a single job, such as site supervision, temporary fencing, job-site trailers, dumpsters, and permits. These costs get billed directly to that job and typically appear as their own line item in the bid. Company overhead, by contrast, covers the fixed costs of running the business as a whole: office rent, front-office salaries, accounting and legal fees, vehicle costs not assigned to a specific job, software licenses, and marketing. No single job caused these costs, so no single job should absorb all of them.

The distinction matters because general conditions are already captured at the job level. Overhead allocation only applies to company overhead, the costs shared across every active project. A contractor who treats general conditions and company overhead as one pool ends up allocating costs twice: once directly to the job for general conditions, and again through the overhead rate for the same expense category. That double-counting inflates job costs and distorts which projects were actually profitable. Getting this distinction right is foundational to sound construction accounting and accurate job cost reporting.

How Do Contractors Allocate Overhead to Individual Jobs?

Contractors allocate overhead to individual jobs in four steps: total the company's annual overhead costs, choose an allocation basis, calculate an overhead rate, and apply that rate to each job based on its share of the allocation basis. The allocation basis is the metric used to divide overhead fairly, most often direct labor hours, direct job costs, or contract revenue.

Here is how the calculation works in practice. A contractor has $480,000 in annual company overhead and 40,000 total direct labor hours across all active jobs. Dividing $480,000 by 40,000 hours gives an overhead rate of $12 per labor hour. A job that consumes 800 labor hours then absorbs $9,600 in allocated overhead ($12 × 800 hours), added on top of that job's direct labor, material, and general conditions costs. Estimators use this same rate during bid preparation, adding the per-hour overhead charge to projected labor hours before applying markup and profit.

The rate should be recalculated at least annually, and more frequently for contractors with seasonal labor swings. A rate built on last year's labor hours will overstate or understate overhead once volume shifts. A contractor whose labor hours drop 20% mid-year but keeps last year's overhead rate will underallocate overhead to every job running in that stretch, quietly eroding margin without an obvious cause.

What Allocation Basis Should a Construction Company Use?

The right allocation basis depends on which resource drives most of a contractor's cost structure. The three most common bases are direct labor hours, direct job costs, and contract revenue, and each fits a different type of construction business.

A specialty electrical subcontractor whose costs are almost entirely field labor gets the most accurate allocation from a labor-hour basis, since overhead genuinely rises and falls with crew hours worked. A site work contractor's jobs often vary widely between labor-heavy grading and material-heavy paving. This contractor typically gets a more accurate allocation from a direct-cost basis, since it captures both labor and material proportionally. Revenue-based allocation is the easiest to calculate. It works well when a contractor mainly needs a rough allocation for financial statement purposes rather than precise per-job cost control. It should not, however, be the basis used for bid preparation on jobs with uneven labor-to-material ratios.

Here is how a direct-cost basis works in practice. A concrete contractor has $360,000 in annual company overhead and $2,400,000 in total direct job costs (labor, material, and subcontracts) across all active jobs. Dividing $360,000 by $2,400,000 gives an overhead rate of 15% of direct costs. A job with $180,000 in direct costs then absorbs $27,000 in allocated overhead (15% × $180,000), added on top of that job's markup and profit. This basis captures material-heavy cost swings that a pure labor-hour basis would miss. That is why it tends to fit site work and concrete contractors better than trades where labor dominates the cost structure.

Overhead Rate Benchmarks by Contractor Type

Overhead rates typically run 10% to 20% of direct job costs for general contractors and 8% to 15% for specialty subcontractors. These ranges are broadly consistent with CFMA's Financial Benchmarker data and with Gurian CPA's work with contractors across both categories in Dallas and Houston. General contractors carry a higher rate because they absorb more administrative overhead per dollar of work: project management staff, estimating departments, and bonding and insurance costs that scale with total contract volume managed. Specialty subcontractors, running leaner back offices with fewer administrative layers per dollar of direct work performed, typically land at the lower end of that range.

These benchmarks work as a sanity check rather than a target. A general contractor calculating an 8% overhead rate from its own numbers should look for underallocated costs. A rate that low usually means some company overhead is being absorbed into job costs elsewhere, or that the labor-hour base used in the calculation is inflated. Conversely, a specialty subcontractor calculating an overhead rate above 18% should review whether general conditions costs are being miscategorized as company overhead, since that double-counts costs already billed directly to jobs. Either way, the benchmark tells a contractor whether their own allocation basis and rate calculation need a second look before that rate gets baked into the next round of bids.

Frequently Asked Questions

How does overhead allocation affect job profitability?

Overhead allocation determines the full cost of a job, not just its direct labor and material costs. A job that looks profitable when measured against direct costs alone can turn unprofitable once its share of company overhead is added in. Accurate allocation during bid preparation prevents contractors from winning jobs priced below their true cost.

What is a typical overhead rate for a construction company?

General contractors typically carry overhead rates of 10% to 20% of direct job costs, while specialty subcontractors typically run 8% to 15%. The exact rate depends on company size, administrative staffing, and the allocation basis used, so contractors should calculate their own rate from actual annual overhead and job cost data rather than applying an industry average directly.

Key Takeaway

Match the allocation basis to whatever resource actually drives cost in your operation — labor hours for labor-heavy trades, direct costs for material-heavy work, and revenue only when simplicity matters more than precision. Use these ranges to sanity-check your own calculated rate, not to adopt as your rate outright.

If you want a second set of eyes on your current overhead rate or allocation basis, schedule a call with our construction accounting team — we respond to new inquiries within 24 hours.

Getting Your Overhead Allocation Right

An accurate overhead allocation method changes how a construction company bids, tracks job profitability, and growth plans. Getting the allocation basis wrong, or mixing general conditions with company overhead, produces job cost reports that look accurate but understate what jobs actually cost to deliver.

Gurian CPA has worked with general contractors and specialty subcontractors across Dallas and Houston for more than 22 years, building overhead allocation methods tied directly to each contractor's job costing system and bid preparation process. You can also read more about how a CPA for construction can help maximize your profits.