While setting up a home office, a technician disables the dhcp service on the office router, but does not want to rely on link-local addressing

You didn't actually ask a question here.

I'm guessing the question is how the home office can still function correctly?

I can see two options:

a) all network clients are configured with their own fixed IP address

b) there is another server than the router that handles DHCP (most NAS devices offer this service as well)

answermetacognitive;

answervisible;