Construction training - OSRS Wiki
https://oldschool.runescape.wiki/w/Construction_training
WEBConstruction is trained by repeatedly building and removing various furniture inside the player-owned house. Planks are the primary material for training, and using them costs money. Normal accounts should buy the planks from the Grand Exchange, and it is recommended to have a lot of spare money to be able to afford a large amount of them …
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