When did you make your next payment? Did he actually start work at 3.3%?
Next payment was about three months later. It covered excavating, most concrete, some framing labor, some framing material, various odds and ends, and the contractor fee. It was about 30% of total project cost.
Actual work (guys on-site doing things) started one month after down payment was made.
The typical process with my general contractor works like this:
Each sub-contractor quote is presented to me for approval. At an appropriate time during the project my GC provides me with a schedule of how much of each sub-contractor's quoted cost was paid. Some subs have been paid in full (if their work is all done) and some have only been paid part of their contract. All those to-date payments are totaled up, the GC fee is added on, and the grand total is my bill to that point in the project.
Some sub-contractors work over a long period of time so their payments are broken up. For example, concrete was $40,000. $2,000 of that was in the down payment to commit to the project. $31,000 was in the next payment as they did the bulk of the work on the foundation. The remaining $7,000 was in the following payment after they poured the slab.
With this method I am never paying ahead of schedule and I see which trades have been paid and which payments are still outstanding. I can easily see if I'm being asked to pay for any work that I don't remember being done. I have asked my GC plenty of questions regarding payouts which he has always answered to my satisfaction.