Bidding Strategy, Estimating | License Contractor School

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Qualifying the Project and Bid/No-Bid Decisions

Determining whether to bid starts with a financial evaluation of the project scope versus the contractor's classification and bonding capacity. Per California Business and Professions Code Section 7059, a contractor may only bid on work for which they are licensed, unless the work is incidental and supplemental to the principal trade. For public works projects, California Public Contract Code Section 10160 requires pre-qualification for projects exceeding $300,000. When reviewing bid documents, estimators must identify 'killer clauses' such as no-damage-for-delay or indemnity agreements that violate Civil Code Section 2782. If a project requires specialized structural work, such as ACI 318 compliant concrete with a compressive strength of 4,000 psi or higher, the contractor must verify they have the equipment to handle specific curing and testing protocols. Walking away from a bid is necessary if the project's geographic location prevents timely site inspections or if the owner refuses to acknowledge the mandatory 'Homeowner’s Bill of Rights' or the three-day right to cancel for residential projects. Proper vetting ensures that the labor burden-including Workers' Compensation, which is mandatory for all contractors with employees-does not exceed the projected profit margin.

Detailed Estimating of Direct Costs

Direct costs include all expenses specifically attributable to the physical construction of the project. This involves materials meeting California Building Code (CBC) standards, such as lumber for floor joists which must follow National Design Specification (NDS) span tables for specific species and grades. For example, a 2x10 Douglas Fir joist spaced at 16 inches on center may have a maximum span of approximately 16 feet 5 inches depending on live load requirements. Labor estimates must include the prevailing wage rates if the project is a public work, as governed by the Department of Industrial Relations (DIR). Equipment costs must account for fuel, maintenance, and compliance with California Air Resources Board (CARB) Tier 4 emission standards for off-road diesel equipment. Furthermore, material estimates should include tax and a waste factor, typically between 5% and 15% depending on the complexity of the design. Failure to include the costs for CBC-mandated inspections-such as special inspections for high-strength bolting or epoxy anchors-will lead to significant bid slippage and potential project losses. All direct costs must be totaled before applying the markup for overhead and profit.

Calculated Overhead and Profit Margins

Indirect costs, or overhead, are the expenses required to run the business but not linked to a specific job. For California contractors, this includes the cost of maintaining the $25,000 contractor’s bond required by B&P Code 7071.6 and any necessary liability insurance. Labor burden is a critical component of overhead and includes FICA (Social Security and Medicare at 7.65%), FUTA (Federal Unemployment Tax), SUTA (State Unemployment Tax), and the high cost of Workers' Compensation insurance in California. Profit is the amount remaining after all direct and indirect costs are paid. A common error in bidding is using 'margin' and 'markup' interchangeably. A 20% markup on $100,000 results in a $120,000 bid, but the profit margin is only 16.6%. To achieve a true 20% profit margin, the contractor must divide the total cost by 0.80. For residential projects, B&P Code 7159 limits the down payment to 10% of the contract price or $1,000, whichever is less. Estimators must ensure that the schedule of values (progress payments) reflects the actual work completed to maintain positive cash flow without violating this statutory limit.

Bidding for Residential Home Improvements

Residential bidding is heavily regulated by the Home Improvement Contract (HIC) laws under B&P Code Section 7159. Every bid for a project over $500 must lead to a written contract containing specific notices, including the 'Notice to Owner' regarding mechanics' liens and the 'Right to Cancel' notice. Estimators must account for the California Energy Code (Title 24) requirements, which may necessitate higher-tier HVAC equipment or specific insulation R-values, such as R-19 in walls or R-38 in ceilings for certain climate zones. In plumbing, the CPC (California Plumbing Code) requires specific pipe sizes and venting; for instance, a 2-inch floor drain is standard for showers, while horizontal drainage piping must be sloped at a minimum of 1/4 inch per foot for pipes 2 inches or less in diameter. If the project involves the California Green Building Standards Code (CALGreen), the bid must include costs for 65% construction waste diversion. Excluding these regulatory costs from a residential bid can result in legal penalties from the CSLB and financial losses due to failed inspections. Proper bidding requires a thorough understanding of these code-mandated minimums to provide an accurate and competitive price.

Strategy for Public Works and Competitive Bidding

Public works bidding is governed by the California Public Contract Code (PCC). Unlike private bidding, public bids are typically opened in a public session, and the contract is awarded to the lowest 'responsive and responsible' bidder. A responsive bid follows all instructions, including the use of specific bid forms and the inclusion of a bid bond, usually set at 10% of the total bid amount. Per PCC 4104, contractors must list all subcontractors who will perform work in excess of 0.5% of the total bid. Failure to list these subcontractors, or listing two for the same work, can lead to bid protests or disqualification. Contractors must also ensure their bid accounts for Cal/OSHA Title 8 safety requirements, such as trench shoring for excavations 5 feet or deeper, and fall protection for heights of 6 feet or more in general construction. On public jobs, the non-collusion declaration (PCC 7106) is a mandatory component to prevent price-fixing. Understanding the nuances of the Subletting and Subcontracting Fair Practices Act prevents legal disputes regarding 'bid shopping' or 'bid peddling' after the contract is awarded.

Post-Bid Procedures and Error Correction

After a bid is submitted, mechanical errors may occur. In California, if a bidder makes a clerical mistake, they may be able to withdraw the bid without forfeiting their bid bond, but only under strict conditions defined in PCC 5100-5103. The mistake must be a 'material' clerical error (such as a transposition of numbers) rather than an error in judgment or a misunderstanding of the plans. The contractor must give written notice to the public entity within five working days of the bid opening. In private work, if a bid is accepted and a contract is signed, the contractor is bound by B&P 7113, which states that failure to complete a project for the contract price is cause for disciplinary action by the CSLB. To win consistently, contractors should utilize a post-bid analysis to compare estimated costs against actual costs. This feedback loop identifies if labor production rates were overestimated or if material waste exceeded the 10% allowance. Winning a bid at a loss is often worse than losing the bid entirely; therefore, a strategy based on historical data and precise code compliance is the only way to ensure long-term solvency.