1. Drawings, when offered for final or competitive estimates, should be sufficient in number and character to represent the proposed works clearly; should be at a scale of not less than one-eighth of an inch to the foot, and be rendered in ink or some permanent process.
2. Proper details should be furnished for work that is not otherwise sufficiently described for estimate.
3. Specifications should be in ink. They should be definite where not sufficiently defined and explained by drawings, and every distinctive class of work to be included in contract should be mentioned and placed under its appropriate heading.
4. Contractors should be notified, at time of estimate, if they are to be restricted in the employment of their subcontractors.
5. Sub-bids received by architects should be held as confidential communications until all the estimates in a given class of work have been submitted.
The principal contractor should add to his bids all these subestimates while in the architect’s office, and should sign a tender in which the names of these above-mentioned subcontractors should be enumerated.
6. A subcontractor should not (without his free consent) be placed under a general contractor, and no general contractor should be compelled to accept (without his free consent) the estimate of any subcontractor.
7. Should a contractor decline to assume in his contract the estimate for any work not included in his original estimate, he should not thereby be denied the contract upon the portions of the work covered by his original estimate.
8. Estimates should not be binding more than thirty days after received.
9. Unless previous notification has been given to the contrary in the specification or otherwise, the lowest invited bidder is entitled to the contract. If radical changes are made, the whole competition should be reopened.