CA Real Estate
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The first thing that you can do is talk to the contractor to understand what has happened and when the new deadline would be to complete the work.
If you cannot come to an agreement on when the work will be completed, then you should write a demand letter to the contractor to complete the work by a specified date, or you will terminate his contract and hire a new contractor to complete the work and deduct it from what you owe the first contractor.
If it costs you more to complete the work than the original estimate from the first contractor, then you can sue in small claims court for up to $10,000 for the difference.