Part of this equation depends on the level of trust between you and your clients.

Can you depend on your clients using good hygiene practices and your clients trust you to do the same? And if either party is exhibiting symptoms, this information should be shared with the other.

Unfortunately, transmission is possible while still asymptomatic or the symptoms can be so minimal that the carrier is not fully aware that they are infected. Testing is not a complete answer because there can be false negatives during the initial stage of infection. And, of course, someone can become infected post test.

New construction pre-wires should be relatively safe if there is minimal crew on the site and good hygiene is practiced -- by everyone.