[esbranson]

RFC 7368 for home networks recommends the use of ULA locally.

> A home network running IPv6 should deploy ULAs alongside its globally unique prefix(es) to allow stable communication between devices (on different subnets) within the homenet

> When an IPv6 node in a homenet has both a ULA and a globally unique IPv6 address, it should only use its ULA address internally and use its additional globally unique IPv6 address as a source address for external communications.

[fulafel]

RFC 7368 is a 2014 "informational" (no ietf standing) doc so it's not a source for current IETF advice. Also it was part of the since closed "homenet" working group initiative trying to define some new stuff that did not get vendor uptake.

But in substance, if you have several subnets, then using ULA may make sense depending on what you're trying to do. However most home networks don't subnet.