4.3 Estimating, Bidding Procedures & Cost Controls

Estimating, Bidding Procedures & Cost Controls

Accurate cost estimating and disciplined bidding procedures are vital to the survival of a construction firm. Underbidding leads to catastrophic job losses and insolvency, while overbidding renders a contractor uncompetitive. Estimating requires precise categorization of direct and indirect costs, accurate allocation of general and administrative (G&A) overhead, and precise mathematical application of markup versus margin.

---

Categorization of Construction Costs

Costs incurred by a construction company fall into three distinct tiers:

1. Direct Costs

Direct costs are expenses directly attributable to creating a specific physical project element.

• Materials: Lumber, concrete, rebar, electrical conduit, drywall, plumbing fixtures.
• Direct Labor: Wages and payroll burden (FICA, FUTA, SUTA, workers' compensation insurance, union benefits) paid to carpenters, electricians, and laborers physically performing work on-site.
• Subcontracts: Fixed-price agreements with trade subcontractors (e.g., HVAC, roofing, paving).
• Direct Equipment Rentals: Scaffolding, cranes, excavators, or concrete pumps rented specifically for the job.

2. Indirect Costs (Jobsite Overhead)

Indirect costs support a specific jobsite but cannot be tied directly to a single physical building component.

• Field superintendent and project manager salaries.
• Temporary jobsite trailers, temporary power, site fencing, and portable restrooms.
• Project permits, plan check fees, and jobsite safety equipment.
• Dumpster rentals, site cleanup, and jobsite security services.

3. General & Administrative (G&A) Overhead (Home Office Overhead)

G&A overhead consists of ongoing corporate operating expenses incurred to support the overall company, regardless of project volume.

• Home office rent or mortgage, utilities, internet, and office equipment.
• Executive salaries, administrative staff wages, legal, and accounting fees.
• Corporate Commercial General Liability (CGL) insurance, estimating software licenses, and marketing.

---

Allocating G&A Overhead

To ensure profitability, home office G&A overhead must be allocated across all active construction projects. Common allocation methods include:

• Direct Cost Percentage Method: $\text{Overhead Rate \%} = \frac{\text{Annual Total G\&A Overhead}}{\text{Annual Total Direct Construction Costs}}$ Example: If a company incurs $200,000 in annual G&A overhead and anticipates $2,000,000 in annual direct costs, the G&A overhead allocation rate is 10% of direct costs.

---

The Mathematics of Markup vs. Margin

A frequent cause of contractor bankruptcy is confusing Markup with Profit Margin. They use the same dollar amount of overhead and profit, but express it relative to two different financial baselines.

Definitions & Formulas

• Direct Cost Base: $\text{Direct Costs} + \text{Jobsite Indirect Costs}$
• Total Contract Price: $\text{Direct Costs} + \text{Overhead} + \text{Profit}$

$\text{Markup \%} = \frac{\text{Overhead} + \text{Profit}}{\text{Direct Costs}}$

$\text{Margin \%} = \frac{\text{Overhead} + \text{Profit}}{\text{Total Contract Price}}$

Conversion Formulas

$\text{Margin} = \frac{\text{Markup}}{1 + \text{Markup}} \quad | \quad \text{Markup} = \frac{\text{Margin}}{1 - \text{Margin}}$

Step-by-Step Numerical Worked Example

Assume a contractor estimates direct project costs at $800,000 and requires $200,000 to cover allocated overhead and profit.

1. Contract Price Calculation: $\text{Contract Price} = \$800,000 + \$200,000 = \$1,000,000$

2. Markup Calculation: $\text{Markup \%} = \frac{\$200,000}{\$800,000} = 25\%$

3. Margin Calculation: $\text{Margin \%} = \frac{\$200,000}{\$1,000,000} = 20\%$

The Common Contractor Trap: If a contractor desires a 20% margin but mistakenly applies a 20% markup to the $800,000 direct cost ($800,000 × 1.20 = $960,000), the bid will be $40,000 short of covering the intended $200,000 overhead and profit!

---

Construction Contract Types & Risk Allocation

---

Job Cost Control & Variance Analysis

Disciplined cost control relies on tracking job costs using standard coding systems (such as CSI MasterFormat). Contractors compare actual costs against budgeted costs during construction to calculate Cost Variance (CV) under Earned Value Management:

$\text{Cost Variance (CV)} = \text{Budgeted Cost of Work Performed (BCWP)} - \text{Actual Cost of Work Performed (ACWP)}$

• Positive Variance (CV > 0): Favorable status (project is running under budget).
• Negative Variance (CV < 0): Unfavorable status (project is experiencing cost overruns requiring immediate corrective action).