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Estimating & Bidding

Base Bid

In Plain English

The main total price a contractor submits to complete the full project as specified.

Definition

The base bid is the total price submitted by a contractor for the full base scope of work as described in the bid documents, excluding any alternates. It represents the minimum complete project cost the contractor is offering. All bidders price the same base scope, enabling direct cost comparison.

Why It Matters in Bidding

The base bid is the number owners use to rank competing contractors, so it must reflect the complete defined scope and nothing more, since alternates and allowances are handled separately. Estimators build the base bid from the takeoff, subcontractor quotes, labor, material, and markups, and any scope omitted or double-counted distorts a contractor's standing directly. Because award decisions on hard-bid projects often hinge on the lowest responsive base bid, precision here determines whether a contractor wins work at a price it can actually deliver.

Example

The contractor submitted a base bid of $4.3 million for the full warehouse build-out, keeping the optional mezzanine priced as a separate additive alternate so it would not inflate the comparison number.

Related Terms

AlternatesAdditive AlternateDeductive AlternateBid

Frequently Asked Questions

The base bid covers the full scope of work described in the bid documents as the standard project. Alternates are optional additions or deductions priced separately so the owner can adjust scope. Keeping optional items out of the base bid ensures every contractor prices the same core project for a fair comparison.
Estimators perform a quantity takeoff from the drawings and specs, gather subcontractor and supplier quotes, then add labor, equipment, general conditions, overhead, and profit. Allowances and contingencies are folded in per the documents. The total represents the contractor's complete offer for the defined base scope before any alternates are considered.
Because all bidders price the identical base scope, the base bid creates a level, apples-to-apples cost comparison. Owners can rank bidders directly on this number and then apply alternates as needed. This is why scope clarity in the bid documents matters: ambiguity causes bidders to price differently and undermines a clean comparison.

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