How to Calculate Overhead Cost in Construction — 3 Methods, CFMA Benchmarks, and What Your Rate Should Be

Cost Construction Accounting
1 day ago
10 min read

By Tammy Hoang, QuickBooks ProAdvisor | Construction Cost Accounting | (949) 889-3283

Construction bookkeeper calculating overhead cost rate using job cost accounting system for contractor in Orange County California office

Most construction contractors know their direct costs — materials, labor, subcontractors, equipment rental on a specific job. The number they often do not know with the same precision is their overhead: the cost of keeping the business running regardless of which projects are active. Construction overhead costs are the indirect expenses that must be recovered across every job you complete — and if they are not calculated correctly and built into your bids, you will consistently underprice your work and wonder why you are busy but not profitable. How to calculate overhead cost in construction is a question every contractor should be able to answer in three steps: identify all indirect costs, total them for a twelve-month period, and divide by the right base number to produce an overhead rate. That construction overhead rate then gets applied to every bid you submit. A construction overhead rate that is calculated incorrectly will either leave money on the table or price you out of competitive bids — neither of which serves the business. Your construction overhead rate is the single most important percentage in your bidding model. At Construction Cost Accounting, managing construction overhead costs is part of every monthly bookkeeping engagement. We track overhead by account, produce monthly reports that separate indirect costs from direct job costs, and help contractors build overhead recovery into their pricing. This guide covers the overhead cost formula construction bookkeepers use, the overhead cost formula construction owners need for bidding, and the overhead cost formula construction CPAs rely on at year-end. The overhead cost formula, the three methods for calculating the overhead rate, the CFMA 2024 benchmarks for what overhead rate your company should have, and how job cost accounting construction bookkeeping tracks overhead in QuickBooks.

What Are Construction Overhead Costs — Direct vs Indirect

Construction overhead costs are all business expenses that are not directly attributable to a specific project. Construction accounting Orange County contractors rely on must cleanly separate direct costs from overhead — and construction accounting Orange County bookkeepers like CCA maintain this separation month by month as the standard monthly close. This is the key distinction in construction accounting Orange County contractors and bookkeepers apply to every expense: does this cost belong to a specific job, or does it belong to the business as a whole? Direct costs — materials delivered to a specific job site, labor hours worked on a specific project, subcontractor invoices for a specific scope of work, permits pulled for a specific project — are job costs. They are coded to the project in the job cost accounting construction system and appear on the job cost report. Indirect costs construction companies carry are the foundation of the overhead calculation. Indirect costs construction bookkeepers track fall into two categories — general overhead and indirect job costs. Indirect costs construction owners often miss are the ones that blur the line between job-specific and company-wide expenses. Indirect costs — everything that keeps the construction company running but is not tied to a specific project — are overhead.

Construction overhead costs include two subcategories. General overhead includes all administrative and operational costs: office rent or mortgage, owner salary for non-project time, administrative staff salaries, accounting and bookkeeping fees, business insurance including general liability and workers compensation, vehicle expenses for non-project vehicles, software subscriptions, marketing costs, and professional dues. Indirect job costs are the costs that are related to construction operations but cannot be assigned to a specific project: site supervision that covers multiple projects, small tools and equipment not assigned to a job, temporary sanitation and site facilities used across multiple projects. Both categories must be included when calculating construction overhead costs — omitting indirect job costs understates your true overhead and leads to underbidding. The table below shows the most common construction overhead cost items, whether they are fixed or variable, and which expense account they should be coded to in your job cost accounting construction system.

Overhead Item	Type	Fixed or Variable	Books To (Account)
Office rent / lease	General overhead	Fixed	Rent Expense
Owner salary (non-project)	General overhead	Fixed	Officer Compensation
Admin staff salaries	General overhead	Fixed	Salaries — Admin
Accounting / bookkeeping fees	General overhead	Fixed	Professional Fees
Business insurance (GL, WC, auto)	General overhead	Fixed	Insurance Expense
Vehicle payments + fuel (non-job)	General overhead	Fixed/Variable	Vehicle Expense
Software subscriptions (QBO, Procore, etc.)	General overhead	Fixed	Software Expense
Marketing and advertising	General overhead	Variable	Marketing Expense
Site supervision (not job-specific)	Indirect job cost	Variable	Indirect Labor
Small tools not assigned to a job	Indirect job cost	Variable	Tools and Equipment
Temporary facilities (general use)	Indirect job cost	Variable	Indirect Job Costs
Utilities — office and yard	General overhead	Variable	Utilities Expense

Construction contractor reviewing overhead cost breakdown and indirect costs report in job cost accounting system at Orange County California office

The Overhead Cost Formula — Fixed + Variable = Total Annual Overhead

The overhead cost formula for construction is straightforward once all indirect costs are identified and categorized. Total Annual Overhead = Total Fixed Overhead Costs + Total Variable Overhead Costs. Fixed overhead costs are the expenses that stay the same every month regardless of how many projects are active — rent, salaried employees, insurance, software subscriptions. Variable overhead costs change based on business volume — utility bills, hourly admin staff, marketing spend, vehicle fuel costs. Here is a real-world example of the overhead cost formula in practice for a mid-size Orange County general contractor. Fixed overhead: Office rent $3,500 per month, owner administrative salary $8,000 per month, admin staff $4,500 per month, business insurance $2,200 per month, software and technology $800 per month, professional fees including accounting $1,200 per month, vehicle payments $1,500 per month. Fixed overhead total: $21,700 per month, or $260,400 per year. Variable overhead: Utilities $600 per month average, marketing $2,000 per month average, vehicle fuel and maintenance $1,800 per month average, miscellaneous tools and supplies $900 per month average. Variable overhead total: $5,300 per month average, or $63,600 per year. Total annual construction overhead costs: $260,400 + $63,600 = $324,000. This $324,000 must be recovered across all revenue the company generates during the year — through the overhead rate applied to every bid. If the company bids $1,200,000 in total revenue for the year, the overhead rate using the revenue method is $324,000 divided by $1,200,000 equals 27%. Every dollar of revenue must contribute 27 cents to covering overhead before any profit is recognized. If actual revenue falls short of the projection, the overhead rate was set too low and the company will not fully recover its indirect costs.

💡 Tammy's Tip: Calculate your total overhead using 12 full months of actual expense data from QuickBooks — not estimates or last year's numbers. Construction overhead costs change as the business grows, adds staff, or takes on larger insurance policies. Recalculate every year before bidding season and whenever a major overhead expense changes.

How to Calculate Overhead Rate in Construction — 3 Methods

Once total annual overhead is calculated using the overhead cost formula, the next step is to calculate overhead rate construction companies rely on for bidding. How to calculate overhead rate construction professionals use varies by cost structure — but all three methods follow the same logic. Calculate overhead rate construction bookkeepers produce from the P&L is the starting point for every accurate bid. The next step is to calculate the overhead rate — the percentage that gets applied to each project bid. There are three standard methods for calculating the construction overhead rate, and the right one depends on your company's cost structure.

Method 1 — Revenue-Based Overhead Rate (Most Common for GCs)

Overhead Rate = Total Annual Overhead ÷ Total Annual Revenue × 100. This is the most widely used method for general contractors and construction companies with consistent revenue. It produces an overhead rate as a percentage of revenue that gets applied to the total value of each new bid. Using the example above: $324,000 ÷ $1,200,000 × 100 = 27% overhead rate. On a $500,000 bid, this contractor must include $135,000 in overhead recovery before profit. This method works well when revenue is predictable and project mix is consistent. It becomes less accurate when project types vary significantly in labor intensity or direct cost composition — a $500,000 design-build project has a very different cost structure than a $500,000 concrete scope of work, and a single revenue-based overhead rate treats them identically.

Method 2 — Direct Labor-Based Overhead Rate (Best for Labor-Heavy Trades)

Overhead Rate = Total Annual Overhead ÷ Total Annual Direct Labor Cost × 100. For specialty contractors where labor is the dominant cost driver — electrical, plumbing, mechanical, framing — the labor-based method produces a more accurate overhead allocation. If the same contractor pays $600,000 in direct labor annually: $324,000 ÷ $600,000 × 100 = 54% overhead burden on labor. This overhead rate is applied to the labor cost on each bid — meaning a project with $80,000 in direct labor would carry $43,200 in overhead recovery. This method is more granular than the revenue method because it allocates overhead proportionally to labor intensity. A project with more labor gets more overhead; a materials-heavy project with less labor gets less. For job cost accounting construction reporting, this method requires accurate labor cost tracking by project — which is a standard function of QuickBooks Online with job costing enabled .

Method 3 — Direct Cost-Based Overhead Rate (Best for Mixed Cost Structures)

Overhead Rate = Total Annual Overhead ÷ Total Annual Direct Costs × 100. For contractors with high material costs alongside significant labor — concrete, site work, commercial interiors — the direct cost method distributes overhead across the total direct cost base, including both materials and labor. If total direct costs across all projects are $1,080,000 annually: $324,000 ÷ $1,080,000 × 100 = 30% overhead rate on direct costs. This overhead allocation construction method is applied to the combined materials and labor cost on each bid, which makes it a more balanced approach than either pure revenue or pure labor basis. The three methods will produce different overhead rates for the same company — the right one is the one that most accurately reflects how your costs are actually distributed across your work. At Construction Cost Accounting, we review which overhead allocation construction method is appropriate for each client based on their project mix, labor-to-material ratio, and historical job cost data.

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CCA calculates and tracks construction overhead costs monthly for contractors throughout Orange County and California.

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Construction bookkeeper calculating overhead rate using three methods for contractor bid preparation in Orange County California

CFMA 2024 Benchmarks — What Overhead Rate Should Your Construction Company Have?

Knowing how to calculate overhead cost in construction is only useful if you know what the number should be. The Construction Financial Management Association — CFMA — publishes annual financial benchmarks for construction companies segmented by revenue size, trade type, and region. According to the CFMA 2024 Financial Benchmarker, construction overhead costs as a percentage of revenue vary significantly by company size. Contractors with annual revenue under $3 million typically carry overhead rates between 25 and 35 percent. The higher rate reflects the fact that fixed overhead costs — office rent, insurance, owner salary, accounting fees — represent a larger percentage of a smaller revenue base. A $2 million contractor paying $500,000 in annual overhead carries a 25% overhead rate before any allocation method choices. Contractors with revenue between $3 million and $15 million typically carry overhead rates of 18 to 25 percent. As volume grows, the same fixed overhead costs cover more revenue, improving the overhead ratio. Contractors at the $15 million to $50 million range typically see overhead rates of 14 to 20 percent, while contractors above $50 million in annual revenue typically achieve rates of 10 to 15 percent through scale and operational efficiency. For most Orange County general contractors and specialty subcontractors in the $1 million to $10 million range, an overhead rate between 20 and 30 percent is the realistic target. If your overhead rate exceeds 35 percent, the construction overhead costs calculation is revealing a cost structure that is too heavy relative to revenue — which requires either growing revenue or reducing fixed overhead expenses. If your overhead rate is below 15 percent for a small contractor, the construction overhead costs calculation likely has missing items — either indirect costs that were not identified or owner compensation that is not fully reflected in the overhead total. At Construction Cost Accounting, we see many contractors whose overhead rate is understated not because their costs are low but because they are coding job-related expenses incorrectly or not separating general overhead from direct costs in their job cost accounting construction system.

💡 Tammy's Tip: A common error in construction overhead costs calculation is including direct job costs in the overhead total — for example, coding all vehicle expenses to overhead when some vehicles are assigned to specific jobs. Vehicles assigned to a single project are a direct job cost. Vehicles that move between multiple jobs or handle administrative tasks are overhead. The distinction matters for both your overhead rate accuracy and your job cost reports.

Tracking Construction Overhead Costs in QuickBooks

The overhead cost formula and overhead rate calculation are only as accurate as the underlying data — and that data lives in your job cost accounting construction system. In QuickBooks Online with job costing enabled, overhead tracking requires a properly structured chart of accounts that separates overhead expense accounts from direct cost accounts. Every overhead expense — rent, insurance, software, owner salary — posts to an overhead account. Every direct job cost — materials, subcontractors, project labor, project-specific equipment — posts to a cost-of-goods-sold account and is coded to the specific job. When the accounts are set up correctly, the Profit and Loss report separates direct costs from overhead automatically. The overhead total on the P&L — the sum of all overhead expense accounts — is the number that goes into the overhead cost formula. Whether the construction bookkeeping system is QuickBooks, the goal is the same: every overhead dollar should be captured in the right account, the overhead total should be calculable from the financial statements, and the overhead rate should be reviewed and updated at least annually. At Construction Cost Accounting, we review the chart of accounts setup for every new client to ensure overhead is being captured correctly — because a misclassified expense produces a misleading overhead rate, which produces a misleading bid, which produces a project that loses money before the first shovel hits the ground.

Your Overhead Rate Is the Foundation of Every Bid You Submit

How to calculate overhead cost in construction is not a complex formula — it is total indirect costs divided by the appropriate base, expressed as a percentage, and applied to every bid you send. The complexity is in the underlying work: identifying every overhead expense, coding it correctly in your job cost accounting construction system, tracking it consistently month after month, and recalculating the overhead rate before it drifts far enough from reality to cause pricing problems. Construction overhead costs that are untracked are overhead costs that are not recovered. And overhead costs that are not recovered come out of profit. Construction Cost Accounting provides construction bookkeeping for contractors throughout Orange County and California, including monthly overhead cost tracking, chart of accounts setup for proper indirect cost separation, overhead rate calculation, and job cost accounting construction reporting that shows exactly what each project costs relative to your overhead structure. If you want to know your actual overhead rate — and whether it is being recovered in every bid you submit — book a free 30-minute consultation with Tammy. Call (949) 889-3283 or schedule below.