An optional add-on item priced separately so the owner can include it if budget allows.
An additive alternate is a scope item listed separately in a bid that the owner may add to the base bid contract. Bidders price it independently so the owner can decide whether to include it based on available budget. Additive alternates allow owners to expand project scope without re-bidding.
A school district lists upgraded gymnasium flooring as an additive alternate, priced at $45,000 beyond the base bid.
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