Change Orders - What's Fair / What's Not

I had a garage built by a general contractor. Along the way I had an few outlets added (by the electrician) and an extra door and hardware ordered (which I will install myself). The contract to build the garage is very simple, it only lists the construction and basic payment terms. There was no mention of "change order" or "upcharge" costs, either verbal or written. Do I still have to pay the change order fee for any changes made after the contract was signed?

Mr. B.,
Let's turn the table 180 degrees. You are a contractor and you agree to do X amount of work for a fixed amount of money. Your customer asks for additional work to be done. Why should you, the contractor, have to pay out of your pocket for this extra work? I am assuming in your situation that the *simple* plans and specifications didn't show these extra items. If this is the case, you made a mistake by not including them. You owe the money if the items were not in the contract.

Oh my goodness, my apologies for any misunderstanding. I have every intention of paying for all material and labor costs associated with my change requests. My question pertains to the additional "upcharges" (25%) requested by the general contractor. There was no mention of this fee.

Mr. B,
If that fee was not spelled out, then it is negotiable. But remember the old saying: The mills of the gods grind slowly but thoroughly.