Yes, you can sue for breach of contract. Whether you are successful depends upon the contract you have. For example, is it in writing. If so, are the aesthetics laid out unambiguously such that you can point to what was promised versus what was received.
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I agree that generally you can sue for breach of contract and your level of success will depend on what is in the contract. I would also add that if there was a specific timeline discussed and contracted for that delay may also be actionable. Best to have a local attorney take a look at the contract for you and advise you as to your potential recourse.