Texas is a "one party consent" state. This means that, under Texas law, as long as you are an identified member of the party to the conversation, you can record the conversation without the knowledge of the other parties. As long as you meet this requirement, which you would if you were talking with the contractor, then you can record your conversations without legal liability.
Since it is a legal recording, you can use it as evidence in court.
Please let me know, if you have follow-up questions.
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