An addendum is a written or graphic instrument issued by the designer on behalf of the owner before the execution of the construction contract. Its purpose is to modify, clarify, or correct the bidding documents (drawings and specifications) during the bidding process. Bidders must acknowledge receipt of all addenda on their bid forms, ensuring all bids are based on the same, updated information. This process ensures fairness and accuracy in pricing before a contract is awarded.

A. Bulletin: This is often an informal term for a general project notification and is not the formal, legally binding document used to modify bidding documents.

C. Change order: This document is used to authorize a change in the work, contract sum, or schedule after the construction contract has been signed and awarded.

1. American Institute of Architects (AIA). (2018). AIA Document A701™–2018

Instructions to Bidders.

Section 3.4.1: "Addenda are written or graphic instruments issued by the Architect prior to the execution of the Contract which modify or interpret the Bidding Documents by additions

deletions

clarifications or corrections."

2. Ballast

D. K. (2021). The Interior Design Reference Manual (7th ed.). PPI

A Kaplan Company.

Chapter 13

Bidding Procedures

Section "Addenda" (p. 13-5): "An addendum is a written or graphic document issued by the interior designer before the execution of the contract that modifies or interprets the bidding documents by additions

deletions

clarifications

or corrections. Addenda are issued during the bidding period..."

3. American Institute of Architects (AIA). (2017). AIA Document A201™–2017

General Conditions of the Contract for Construction.

Article 7.2.1: Defines a Change Order as "a written instrument prepared by the Architect and signed by the Owner

Contractor

and Architect stating their agreement upon... a change in the Work... the adjustment... in the Contract Sum... and the adjustment... in the Contract Time." This confirms its use is post-contract award.