He will turn your logs into planks for a fee. This fee depends on the type of log you use.  He also sells supplies for Construction .  This includes saws, nails, and cloth. He can be found along the southern wall of the Varrock Lumber Yard. (Northeast of Varrock) 

Sawmill Shop
Stock Cost
Saw 1000 13
Bolt of cloth 1000 650
Bronze nail 1000 2
Iron nail 1000 5
Steel Nail 1000* 3*

  • Unconfirmed max stock and cost at full stock
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