I am a subcontractor on a project that was supposed to take 4 months. It has been 8, goping on 9 months. During this time, materials have greatly increased in price. When I speak to the General Contractor, he tells me there will be no compensation. The main reason for my hold ups is because the owner never submitted the bioswell plan to SMUD for SMUD to include in the SMUD Comittment drawings. The bioswell had already been installed and the owner did not want to pay to remove it to install the SMUD conduits. So this portion of the project sat for 3-4 months. Once they dug the bioswell out to install the SMUD conduits, the conduit was $10,000 more than the original bid price.
If your question is whether you have a potentially valid claim for extra compensation, the answer is yes.