Seperate the building process into
1. Cleaning/digging
2. Building the building

For 1. it probably makes sense to create a new hut/worker(e.g. a digger) for that task, 1. requires to be completed before 2. should be allowed to start.

Make it compatible to be further split into even more detailed working steps

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For that it would be good to

• Add a field to the workorders to add dependency to another work order
• Before assigning himself to an order a worker checks if the dependency is fulfilled
• Make the new worker
• Make the builder only claim the job if the new worker does not exist
• Make a button in the builder if he can claim the task if the new worker is busy
• Extend the work order to be able to stop and start after a certain task
  (Work order could contain Start_task and End_task)

Closed in favor of joint issue.