Thank you for your question. I am a licensed New Jersey professional. Please permit me to assist you with your concerns.
There are two separate issues here, and please permit me to respond to both.
There are actually two potential breaches of contract here, one that he committed against you, and one you committed against him. In terms of his potential breach, if he requested more funds for the same exact work, it may be a breach of the original terms. Likewise, requesting that you purchase the top at your own expense without benefit could be a breach of terms. He could request or ask that you purchase it on your own, but would not be able to charge you for value out of the original contract.
On the other hand you could not charge him for your time, gas, travel, or pain and suffering--this is a contract, and unless he expressly contracted with you for chose charges, you could not pursue them against him. Furthermore, New Jersey law does not grant 'pain and suffering' for a contractual breach, but for personal injury claims, something that did not happen here. If you failed to pay him based on this withholding, the courts would not deem it be reasonable and would request and require that you pay him what he earned, minus value for the top itself.
DISCLAIMER: Answers from Experts on JustAnswer are not substitutes for the advice of an attorney. JustAnswer is a public forum and questions and responses are not private or confidential or protected by the attorney-client privilege. The Expert above is not your attorney, and the response above is not legal advice. You should not read this response to propose specific action or address specific circumstances, but only to give you a sense of general principles of law that might affect the situation you describe. Application of these general principles to particular circumstances must be done by a lawyer who has spoken with you in confidence, learned all relevant information, and explored various options. Before acting on these general principles, you should hire a lawyer licensed to practice law in the jurisdiction to which your question pertains.
The responses above are from individual Experts, not JustAnswer. The site and services are provided “as is”. To view the verified credential of an Expert, click on the “Verified” symbol in the Expert’s profile. This site is not for emergency questions which should be directed immediately by telephone or in-person to qualified professionals. Please carefully read the Terms of Service (last updated February 8, 2012).