depends where you have the work done...around $350 at the local shop to about $600 at a Honda dealership. It's the labor that will cost you. Also, since the belt replacement you might think about having the internal water pump, crankshaft seal (which a good repair shop will do) replaced, and camshaft replaced (again, a good shop will check the wear on the camshaft). It will be more money but well worth it. The cost of replacing the timing belt is small money compared to the possible costs if the timing belt should fail and damage the engine.