From Lotro-Wiki.com

Superior Workbench

Location

• North Downs
  • Esteldin
• Ered Luin
  • Thorin's Hall - requires Acquaintance reputation with Thorin's Hall to access.
• Forochel
  • Suri-Kyla - requires Ally reputation with Lossoth of Forochel to access.

(The superior workbench in Hobbiton has been replaced with a normal one.)