CHOP | 2.3.9 | pp 5

To ensure that clients receive competitive prices, contractors must have adequate time to review the bid documents and to prepare a bid.  The length of the bid period will vary, based on the project size and complexity.  A large, complex project “out for Public Tender” may require four to six weeks for bidding, whereas a simple, small project by invited bid may only require two weeks.  Market conditions can affect the bid period; for example, several projects being bid at the same time may require a longer bid period. 

The last opportunity for issuing an addendum should be no later than four working days before bid closing. The same written instructions should be received in a timely manner by all bidders.  If this is not possible, consideration should be given to extending the bid period.

It is not recommended to receive bids in more than one location. It is increasingly common for bids to be received electronically and architects are advised to refer to Section 7.8 of CCDC 23, A Guide to Calling Bids and Awarding Construction Contracts, for information on principles which apply when receiving bids electronically.