I was just putting a few numbers on an Excel sheet and realized it could be useful to everyone.
So here's a compilation of all the ways to increase your (passive) Reach.
I've included the sneak peeks from Treasure Vault.
I obviously have forgotten some ways to increase it, so don't hesitate to tell me and I'll add them.
Skeleton level 5 ancestry feat well armed
Good one, and can be combined with everything so I have to add tons of lines...
I hope I haven't forgotten any. It becomes a bit unreadable in fact...
Yes, that's why I limited the list to passive reach. Both because active reach has too many ways to be increased. But also because active reach and range are not much different: It's the distance you can affect with a specific action/activity.
On the other side, passive Reach is important because it means you can use all effects (or most of them) in your Reach. The most important ones being Reactions like AoOs as your Reach then becomes a zone of control, which is important to martials.