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Glossary

Substitution request

A formal request to use a product other than the one specified, reviewed by the architect or engineer.

A substitution request asks the design team to accept a different product. It typically includes product data, a side-by-side comparison with the specified product, test reports or listings, and warranty terms.

The rules are set in Division 01, usually in section 01 25 00 Substitution Procedures, and in the instructions to bidders. Many public projects only consider substitutions before bid.

Why it matters to manufacturers

The deadline that matters is the substitution deadline, not the bid date. Miss it and the named products are what gets bid.

Related terms

Prior approvalApproval of a substitute product before bids are due, so every bidder can price it.Division 01The General Requirements division, which sets the rules for substitutions, product options and submittals.Or approved equalSpec language that lets a product other than the named one be used, if the design professional accepts it as equal.

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