In construction, profit margins are notoriously thin, often hovering just above break-even. It’s not just materials and labor that eat into your bottom line. Overhead costs—the unavoidable expenses that keep your business running, whether projects are active or not—quietly shape whether your company thrives or struggles. Mastering how to track, calculate, and control these hidden costs can be the difference between growth and stagnation.
These costs, often referred to as the expenses to “keep the lights on,” include everything from office rent to insurance and administrative salaries. Many of these overhead costs, such as rent, utilities, insurance premiums, and certain administrative expenses, may be tax-deductible, depending on local tax regulations. Business owners should consult with a tax professional to identify eligible deductions and ensure compliance.
Additionally, capital investments, like equipment or vehicles, can be depreciated over time according to standard depreciation schedules (e.g., straight-line or accelerated methods), allowing businesses to spread the tax benefits over several years. Proper documentation, including receipts, invoices, and detailed expense records, is critical to substantiate deductions and comply with tax authority requirements. Miscalculating or mismanaging overhead can lead to underbidding, financial losses, or uncompetitive pricing, making it essential for construction business owners to master this aspect of financial management.
Effective tax planning strategies, such as timing major purchases to optimize deductions or leveraging tax-advantaged accounts, can further enhance overhead management. Overhead costs can also influence which project management software best suits your needs, especially when weighing solutions tailored for small to mid-sized contractors.
While many turn to well-known options like Buildertrend, others have found greater cost efficiency with Buildertrend alternatives that align more closely with their business model.
This comprehensive guide explores overhead costs in a construction company, their types, why they matter, how to calculate them, how to allocate them to projects, strategies to reduce them, and common mistakes to avoid. By the end, you’ll have a clear roadmap to managing overhead costs effectively, ensuring your construction business remains financially healthy and competitive.
What is Overhead Costs
Overhead costs are essential expenses that keep a construction business operational but aren’t directly tied to specific projects. These include office rent, utilities, insurance, and administrative salaries.
Divided into direct overhead (project-specific costs like temporary rentals or site supervisor salaries) and indirect overhead (general expenses like office utilities or marketing), understanding and categorizing these costs accurately is key to effective financial management and profitability.
Definition of Overhead Costs
Overhead costs are the ongoing expenses required to operate a construction business that are not directly attributable to a specific project. Unlike direct costs, such as materials or labor used on a job site, overhead costs support overall business operations. They include expenses like office rent, utilities, insurance, advertising, and salaries for administrative staff. In essence, overhead costs keep the business running, regardless of whether a project is active.
Types of Overhead Costs
Overhead costs in construction are categorized into two main types: direct overhead costs and indirect overhead costs. Understanding the distinction is crucial for accurate calculation and allocation.
| Type | Description | Examples |
| Direct Overhead Costs | Costs directly related to a specific project, also known as “Project Specific Overhead” or “Job Overhead.” | Temporary rentals (e.g., portable toilets, fencing), project-specific utilities (e.g., water supplies, cooling stations), equipment rentals, salaries of site supervisors or foremen. |
| Indirect Overhead Costs | General business expenses not tied to a particular project, also known as “General Overhead.” | Office rent, utilities, insurance (e.g., general liability, workers’ compensation), advertising, marketing, salaries of administrative staff, legal fees, depreciation of office equipment. |
The distinction between direct and indirect overhead can sometimes be blurry. For example, bulk material orders or interest on financed materials may require careful consideration to classify correctly.
Why Overhead Costs Matter
Overhead costs are a critical factor in the financial health of a construction company. Here’s why they are so important:
- Profitability: Overhead costs directly impact your bottom line. Failing to account for them in project bids can result in losses, as you may not cover all expenses. Conversely, overestimating overhead can make your bids uncompetitive.
- Bidding Accuracy: Including the correct overhead costs in bids ensures that you cover all expenses and achieve a profit. Accurate bidding is essential for winning contracts without sacrificing financial stability.
- Financial Health: Proper management of overhead costs ensures that your business can sustain operations during periods of low project activity. It also supports compliance with accounting standards and tax regulations. Learn more about financial tools in our guide to the best construction accounting software for contractors.
- Competitive Edge: Optimizing overhead costs can reduce expenses and potentially offer more competitive pricing, giving you an edge in the market.
According to industry benchmarks, the average profit margin in construction is around 6%, with a goal of 10% or higher to ensure profitability. Overhead costs, typically around 10% of project costs, are significant in achieving these margins.
Benchmarking Overhead Costs
Understanding how your overhead costs compare to industry standards is crucial for assessing financial performance and maintaining competitiveness. The Construction Financial Management Association (CFMA) provides valuable benchmarks for overhead costs across various segments of the construction industry, segmented by company size, specialty, and region. These benchmarks help contractors identify areas for improvement and ensure their overhead rates align with industry norms.
Overhead by Company Size: According to CFMA’s 2024 Financial Benchmarker, overhead costs as a percentage of revenue vary significantly by company size. Small construction companies (annual revenue under $50 million) typically have overhead rates ranging from 20-25%, driven by higher relative administrative and operational costs. Medium-sized companies (revenue between $50-100 million) see overhead rates of 15-20%, benefiting from economies of scale. Large companies (revenue over $100 million) often maintain lower overhead rates, around 10-15%, due to their ability to spread fixed costs across a larger project portfolio.
Overhead by Construction Specialty: Overhead costs also differ by construction specialty. CFMA data indicates that general contractors, primarily engaged in commercial and institutional projects (NAICS 236220), typically operate with overhead rates of 15-20% of revenue. Specialty trade contractors, such as those in electrical or plumbing (NAICS 238), often face higher overhead rates of 18-25%, reflecting the need for specialized equipment and skilled labor. Industrial contractors (NAICS 236210) may see overhead rates of 12-18%, while heavy highway contractors (NAICS 237) typically range from 10-15%, as their projects often involve lower administrative overhead but higher equipment costs.
Regional Variations: Geographic location significantly influences overhead costs due to differences in labor rates, real estate costs, and regulatory requirements. Urban areas, particularly high-cost regions like the Northeast and Far West, report higher overhead rates, often 18-22%, driven by elevated office rent and insurance costs. In contrast, rural areas and low-cost regions, such as the Midwest and Southwest, typically see overhead rates of 12-16%, benefiting from lower operational expenses. For example, CFMA’s 2023 Benchmarker noted that Industrial & Nonresidential companies in the Far West had overhead costs approximately 10% higher than those in the Midwest due to regional economic factors.
By benchmarking overhead costs against these industry standards, construction companies can identify inefficiencies, adjust pricing strategies, and improve profitability. Regularly reviewing CFMA’s Financial Benchmarker or similar tools ensures that your overhead rates remain competitive and aligned with current market conditions.
How to Calculate Overhead Costs
Calculating overhead costs requires a systematic approach to ensure accuracy. Below are two common methods used in the construction industry, along with step-by-step guidance.
Method 1: Percentage of Direct Costs
This is a straightforward method suitable for most construction companies, particularly smaller ones.
- List All Overhead Expenses
Identify both direct and indirect overhead costs. Direct costs include temporary rentals, project-specific utilities, and site-specific salaries. Indirect costs include office rent, insurance, advertising, and administrative salaries. - Calculate Total Overhead
Sum all overhead expenses for a standard period, such as one month. For example, if your monthly overhead includes $20,000 in office rent, $10,000 in insurance, and $20,000 in administrative salaries, the total is $50,000. - Determine Total Direct Costs
Calculate the total direct costs (e.g., materials, labor, equipment) for the same period. Suppose your direct costs for the month are $200,000. - Calculate Overhead Rate
Divide the total overhead by the total direct costs and multiply by 100 to get the overhead rate as a percentage.
Formula:
Overhead Rate = (Total Overhead / Total Direct Costs) * 100
Example:- Total overhead: $50,000
- Total direct costs: $200,000
- Overhead rate = ($50,000 / $200,000) × 100 = 25%
- Apply to Projects
Use this overhead rate to estimate overhead costs for future projects. For a project with direct costs of $20,000, the overhead cost would be 25% of $20,000, or $5,000.
This method is simple and effective, especially for small to medium-sized businesses.
Method 2: Eichleay Formula
The Eichleay Formula is a more advanced method used by larger construction companies or in legal disputes, such as those involving construction delays. It calculates the allocable Home Office Overhead (HOOH) to a specific project.
Formula:
Allocable HOOH = (Contract Billings / Total Company Billings Over Contract Period) * HOOH During Contract Period
Example:
- Contract Billings: $300,000
- Total Company Billings: $600,000
- HOOH During Contract Period: $90,000
- Allocable HOOH = ($300,000 / $600,000) × $90,000 = $45,000
To further refine this, you can calculate a daily HOOH rate:
Daily Allocable HOOH = Allocable HOOH / Contract Performance Period
Example:
- Allocable HOOH: $45,000
- Contract Performance Period: 92 days
- Daily Allocable HOOH = $45,000 / 92 = $489 per day
This method is particularly useful for allocating indirect overhead costs in complex scenarios or when seeking compensation for delays.
Allocating Overhead Costs to Projects
Once overhead costs are calculated, they must be allocated to projects to ensure accurate pricing and financial reporting.
- Direct Overhead: These costs are directly charged to the specific project they relate to. For example, the cost of renting portable toilets for a job site is allocated entirely to that project.
- Indirect Overhead: These costs are shared across all projects. Use the overhead rate from Method 1 or the Allocable HOOH from Method 2 to distribute these costs proportionally based on project size, duration, or direct costs.
For instance, if a contractor’s annual business is $1,000,000 and annual overhead is $50,000, the overhead percentage is 5%. For a $150,000 project, the overhead cost would be $7,500. Accurate allocation ensures fairness and prevents any project from being over- or undercharged.
Strategies to Reduce Overhead Costs
While overhead costs are necessary, there are strategies to manage and reduce them without compromising business operations. Here are some effective approaches:
- Improve Bidding Process: Use construction bidding software to ensure accurate estimating based on historical data. This reduces the risk of over- or underestimating costs, improving profitability.
- Leverage Technology: Leverage technology by implementing construction management software that supports real-time cost tracking and budgeting. While some teams have used tools like CoConstruct, others have found that more tailored platforms can offer greater precision and flexibility when managing expenses.
- Simplify Business Operations: Streamline administrative processes to reduce the need for excessive staff or resources. For example, using digital tools for communication and documentation can save on paper and storage costs.
- Regularly Review Expenses: Periodically assess all overhead expenses to identify and eliminate unnecessary costs. Negotiate better rates with suppliers, service providers, or insurers to lower expenses.
- Optimize Equipment and Tools: Invest in efficient equipment and tools that reduce long-term maintenance and replacement costs. For example, choosing durable vehicles or software can lower overhead over time.
By implementing these strategies, construction companies can optimize their overhead costs, freeing up resources for growth and investment.
Common Mistakes in Overhead Calculation
Even experienced construction professionals can make mistakes when calculating overhead costs. Here are some common pitfalls to avoid:
- Not Separating Direct and Indirect Overhead: Failing to distinguish between these types can lead to inaccurate project costing and financial reporting.
- Overlooking Certain Costs: Small expenses, like depreciation or minor administrative costs, might be forgotten or misclassified, resulting in incomplete calculations.
- Using Outdated Rates: Overhead rates should be recalculated regularly to reflect changes in business operations, such as new hires or equipment purchases.
- Failing to Adjust for Changes: As the business grows or shrinks, overhead costs change. Not adjusting calculations can lead to inaccurate bidding and profitability issues.
- Lumping All Overhead Together: Treating all overhead as a single percentage can oversimplify calculations, especially for indirect costs that require precise allocation.
Conclusion
Overhead costs are a critical component of running a successful construction business. By understanding overhead costs, why they matter, and how to calculate them accurately, construction companies can ensure they price projects correctly, maintain profitability, and manage their financial health effectively. Whether using a simple percentage-based method or the more advanced Eichleay Formula, accurate calculation and allocation of overhead costs are essential for competitive bidding and long-term success.
To stay ahead, regularly review and adjust your overhead calculations to reflect current business conditions. Leverage technology, streamline operations, and avoid common mistakes to optimize your overhead costs. By doing so, you’ll position your construction company for sustainable growth and profitability in a challenging industry.
