I have a contract which states my constructon project will take ten weeks. It is still not completed at week 22. Is this a breach of contract?

From the information you have supplied it sounds like a breach but it might take a review of the contract to be sure.  Why did the delay occur?  was there a storm or other act of nature that prevented the completion of the project?  Was there an agreed upon extension of time?  Either implicit or explicit?  Meaning did you seem to agree that the project could take longer?  We have attorneys that are used to dealing with construction law matters, and if you would like to talk to one, contact my office and I will assist you.