There are four pieces that are typically submitted to the client:
1. Drawings: Full size drawings, hard copies, electronic, sufficient amount to send out to bid, permit or review.
2. Specifications: Complete specifications, same amount of copies to match the drawings, typically.
3. Cost Estimate: Full construction estimate for each bid item, if you have bid items. Typically, the estimate is split to match the sections of the specifications.
4. Basis of Design: This is exactly as it states, it is a basis of your design. What decisions were made? What was the basis of your decision. In this document you would include load calculations, manufacturer's catalog cuts, life cycle costs analysis, other engineering calculations (HW analysis, pipe sizing, duct sizing, fan sizing, pump sizing, etc.) Meeting minutes, owner's project requirements, a copy of the contract that you have with the client. I know this may seem like a lot, but a lot of these things do help out later, when the client comes back to you with some issues after construction is completed.
Justin K, P.E.