Alternate Bid: A Tool That Allows the Review of Cost Options in Construction Tenders

A Detailed Explanation

An Alternate Bid serves as a strategic tool in construction procurement, allowing clients to solicit pricing for specific variations to their primary project requirements without altering the fundamental integrity of the base tender. Unlike a post-contract change order, which amends an existing agreement, an alternate bid is a proactive mechanism embedded within the initial tender package, offering options before a contract is even awarded.

Clients carefully articulate these alternate requirements within the formal tender documents, typically in sections such as the Instructions to Bidders, Scope of Work, or as specific line items in a Bill of Quantities. These requests are usually categorized into three distinct types:

1. 1. Add Alternates: These are options that, if accepted by the client, will increase the total contract value above the base bid. Examples include adding an additional building wing, incorporating high-end custom finishes, or upgrading a specified system (e.g., from standard to smart building technology).
   2. Deduct Alternates: Conversely, these options, if accepted, will decrease the total contract value below the base bid. This could involve substituting a less expensive material for one originally specified, removing a non-essential feature, or reducing a portion of the overall project scope.
   3. Substitution Alternates: These alternates involve replacing a specified item or system with another, where the cost impact can be either an addition or a deduction depending on the relative cost of the substitute. For example, changing a specific type of flooring or insulation material.

For contractors, preparing alternate bids demands meticulous attention to detail and accurate cost estimation. Each alternate must be priced independently, considering all direct costs (materials, labor, equipment) and indirect costs (overhead, profit) associated with that specific modification. The challenge for bidders is to price these alternates competitively while ensuring they remain profitable, and to clearly articulate any assumptions made in their pricing.

For clients, the evaluation process is critical. They typically first identify the lowest compliant base bid. Subsequently, they review the pricing for all defined alternates, weighing the cost implications against the perceived value, functionality, budget availability, and strategic objectives of the project. The final contract price is then formed by combining the selected base bid with the accepted alternates. This structured approach provides transparency and allows for a highly informed decision on the ultimate project configuration and cost.

Origin 

The fundamental practice of proposing different options or conditions within a commercial agreement has roots dating back to early trade. However, the specific term “Alternate Bid” as a distinct element within formalized construction procurement processes became standardized in the 20th century. 

As construction projects grew in scale, technical complexity, and financial intricacy, the need for clients to gain greater flexibility and control over their investments became paramount. This led to the development of structured bidding documents that could accommodate pre-defined variations. The word “alternate” originates from the Latin alternare, meaning “to do by turns” or “to offer a choice,” perfectly encapsulating the nature of these optional proposals. Coupled with “bid,” which signifies a competitive offer, “Alternate Bid” precisely describes a formal, optional price submitted for a variant of the project.

Example

Consider a tender for a new community library building:

• • Base Bid: Construction of a 2-story library with a standard brick exterior, basic interior finishes (carpeted floors, painted drywall), and a conventional HVAC system.

• • Alternate Bid #1 (Add Alternate – Exterior): Provide the additional cost to upgrade the exterior facade from standard brick to natural stone cladding on the front elevation. (This would increase the base bid cost).

• • Alternate Bid #2 (Deduct Alternate – Interior Scope): Provide the deduction in cost if the dedicated “Children’s Reading Nook” (a specific, enclosed space with custom shelving) is omitted from the ground floor plan. (This would decrease the base bid cost).

• • Alternate Bid #3 (Substitution Alternate – Sustainability Feature): Provide the cost difference (addition or deduction) to install a rooftop solar panel array sufficient to offset 20% of the building’s energy consumption, instead of relying solely on grid power. (This could be an addition or a deduction depending on the initial energy solution priced in the base bid and the cost of the solar array).

The contractor submits their price for the Base Bid as the primary offering. Simultaneously, they provide separate, clearly itemized prices for Alternate Bid #1, #2, and #3. After reviewing all submitted bids, the client can then decide which, if any, of these specific alternates to accept, thereby adjusting the final contract price.

Use Cases 

• • Public Sector Infrastructure: Government bodies often use alternates for public works (e.g., roads, bridges, public buildings) to manage budgets and public expectations. They might bid a core project with alternates for enhanced landscaping, public art installations, or advanced pedestrian amenities, which can be selected if initial bids are favorable or additional grants are secured.

• • Contingency Budgeting for Private Developments: Developers facing uncertain market conditions or phased financing often leverage alternates. They can price a “must-have” base project, along with “nice-to-have” add alternates (e.g., a fitness center in a residential complex, upgraded retail frontage) that can be incorporated if sales targets are met or financing improves.

• • Design Exploration and Value Engineering: Architects and clients use alternates to compare the cost implications of different design elements or material choices without committing to a single option. For instance, comparing the cost of different types of glazing, flooring, or HVAC systems allows for informed value engineering decisions.

• • Phased Project Implementation: For very large developments, alternates can be structured to price future phases or specific project components that may be added at a later stage. This allows the client to obtain competitive pricing for expansion scenarios upfront, aiding long-term planning.

Benefits & Drawbacks

Benefits of using alternate bids:

• • Unparalleled Flexibility for Clients: Enables project owners to dynamically adjust the project’s scope, materials, or features based on real-time budget availability, market changes, or evolving preferences, without the significant delays and costs of re-tendering.

• • Transparent Cost Comparison: Provides a clear, pre-quantified financial impact for specific project variations from all competing bidders, simplifying the complex decision-making process for the client.

• • Enhanced Cost Optimization and Control: Empowers clients to strategically balance desired features against their budget by exploring cost-saving deduct alternates or evaluating the true cost of premium upgrades through add alternates.

• • Reduced Administrative Burden: Minimizes the need for lengthy and costly re-tendering processes when minor or even significant scope adjustments are desired after the initial bid opening.

• • Informed Decision-Making: Clients gain a comprehensive understanding of diverse options and their associated costs before contract award, leading to a project outcome that better aligns with their strategic objectives.

Drawbacks of using alternate bids:

• • Increased Estimating Complexity for Bidders: Contractors face a significantly higher workload and potential for errors as they must meticulously prepare multiple detailed pricing scenarios for the base bid and each alternate, increasing overhead during the tender phase.

• • Potential for Strategic Bid Manipulation: If not rigorously defined and evaluated, there’s a risk that contractors might strategically manipulate alternate pricing to make their base bid appear more attractive, potentially distorting the true competitive landscape or overall value.

• • Challenges in Bid Evaluation Comparability: The presence of numerous alternates can complicate the process of comparing different contractors’ submissions, especially if there are inconsistencies in how bidders interpret or price specific alternate options.

• • Risk of Ambiguity and Disputes: Poorly worded or ambiguous alternate descriptions in the tender documents can lead to contractor misinterpretations, resulting in scope disputes, cost overruns, or change orders during the construction phase.

• • Dilution of Focus on Base Bid Optimization: The extensive effort required for alternates might divert a contractor’s resources and attention from thoroughly optimizing and refining their primary base bid for the core project scope.

Q&A