The engineering forms such as ICE can be said only to require standard workmanship. It dawned on me that hardly ever do I see a contract that calls expressly for a higher than ordinary standard of work. The work need only be of average quality to comply with legal obligations. But put all that aside. What I mean is, coax your client to go for craftsman quality of the sort my builder friends in Norfolk can produce.
Alpha is first-quality work.
Ord is the ordinary everyday contractual standard. The client, of course, pays more for alpha. But real builders will be very happy to take on this work. They love doing a great job. This, however, must be explicit in the contract.