Contractor problems?

Our contractor is almost finished building a room addition. They said it would take 3 weeks, it's been 7 so far. The had to redo the siding after making lots of mistakes. They put on the roof shingles incorrectly. The windows and trim are not level. There are several other minor issues. We are considering... show more Our contractor is almost finished building a room addition. They said it would take 3 weeks, it's been 7 so far. The had to redo the siding after making lots of mistakes. They put on the roof shingles incorrectly. The windows and trim are not level. There are several other minor issues. We are considering witholding about 30% of the total payment due to these issues. Does this sound fair?
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