Direct costs and overhead allocation

Anatomy of a Landscape Bid: Core Cost Categories

In landscape contracting, construction cost accounting divides project expenses into four primary categories:

Direct Materials and Waste Factors

Direct materials include all physical goods permanently incorporated into the finished project: nursery stock, turf sod/seed, concrete pavers, natural stone, retaining wall units, crushed base rock (e.g., 3/4-inch minus), bedding sand, topsoil, compost, mulch, and irrigation components. Freight and delivery fees assessed by suppliers are also direct material costs.

Estimators must add realistic waste factors to material takeoffs:

• 5% to 10% for pavers and segmental retaining wall units to cover radius cuts, edge trimming, and handling breakage.
• 10% to 20% for bulk soils, compost, and aggregate base to account for wheelbarrow loss, subgrade undulations, and mechanical compaction settling.
• 5% to 8% for sod rolls and irrigation lateral piping.

Direct Labor and Labor Burden

Direct labor represents the field wages paid to installers, machine operators, and site foremen. However, base wages reflect only part of the employer's labor expense. Contractors must add labor burden—the mandatory taxes, statutory contributions, and benefits required by law:

• FICA: Social Security (6.2%) and Medicare (1.45%).
• Federal & State Unemployment: FUTA (0.6%) and Oregon SUTA (variable employer experience rating).
• State Benefit Assessments: Paid Leave Oregon and the Workers' Benefit Fund (WBF).
• Oregon Workers' Compensation Insurance: Mandatory for all non-exempt employers under Oregon Landscape Contractors Board (LCB) licensing rules. Landscape construction (NCCI Code 0042) rates typically range from $4.00 to $12.00+ per $100 of gross payroll, depending on claims history and the employer's Experience Modification Rating (EMR).
• Voluntary Benefits: Employer-paid health insurance, retirement contributions, and paid time off (PTO).

Aggregated statutory taxes and benefits produce a labor burden rate typically between 30% and 50% over base wages:

$$\text{Burdened Hourly Rate} = \text{Base Wage} \times (1 + \text{Labor Burden Rate})$$

Example: An installer with a $24.00/hour base wage and a 40% burden costs the business $33.60 per hour ($24.00 × 1.40).

Equipment and Subcontractor Costs

• Dedicated Equipment: Ownership and operating (O&O) expenses (depreciation, financing, preventive maintenance, fuel, and track/tire wear) for owned machines, as well as rental fees for specialized equipment (e.g., mini-excavators or power trenchers) dedicated to the project.
• Subcontractors: Specialized licensed trades hired under contract, such as commercial tree fallers, structural engineers, or licensed electricians for high-voltage exterior connections.

Indirect Job Costs (Job Overhead)

Indirect job costs are expenses caused directly by a specific project that cannot be assigned to a specific material or labor assembly. Examples include site-specific grading permits, roll-off dumpster rentals, disposal tipping fees, OSHA-mandated portable toilet rentals, mobilization hauling, and secure on-site storage boxes.

General & Administrative (G&A) Overhead

While indirect job costs end when the project concludes, General & Administrative (G&A) overhead represents the ongoing operating expenses necessary to maintain the enterprise regardless of sales volume:

• Shop and equipment yard lease or mortgage payments.
• Office salaries (bookkeepers, estimators, office managers, and owners).
• Office utilities (power, water, heating, communications, and internet).
• Commercial General Liability (CGL) insurance and commercial auto fleet policies.
• Professional fees for CPA tax accounting and legal counsel.
• Marketing, advertising, estimating software subscriptions, and Oregon LCB license renewal fees.

If G&A overhead is not systematically recovered across billable estimates, it directly erodes business net profit.

Overhead Allocation Methodologies

Contractors allocate annual G&A overhead to project estimates using three primary methods: