Engineering and Construction

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Invitational bidding, also called   closed bidding , is another variation of the DBB method that is generally used for quasi-public and some private projects. In this method, the owner preselects general contractors who have demonstrated, based on their experience, resources, and financial standing, their qualifications to perform the work. The selected contractors are then invited to bid for the project, and the contractor with the lowest bid is then awarded the contract. The architect (as the owner’s representative) may be involved in the prescreening process.

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This method is very similar to competitive sealed bidding and is commonly used for publicly funded projects. The difference between competitive sealed bidding and competitive sealed proposal methods is that the owner’s selection of the general contractor is not based on price alone but also on such other criteria as the contractor’s past experience, safety record, proposed personnel, project schedule, and so on. To ensure fairness, the advertisement and bidding documents must provide the details of the selection criteria, with relative weightings assigned to each criterion.