Workbench can be upgraded upto level 5 by building the following four items:
– Chopping Block
– Tanning Rack
– Adze
– Tool Shelf
Building one of the above items levels up the workbench by 1 point. Building several of the same item doesnt affect the workbenchc level.
—————————————–
Valheim Game Guide: https://www.youtube.com/playlist?list=PL_l3PEDN9zYjaE73JZX54vLFX969Z-Iuf
—————————————–
Played on PC:
Intel i5-7600 CPU @ 3.5Ghz
GeForce GTX 1070
—————————————–
Source