A Honda Civic timing belt replacement cost can vary somewhat. The actual timing belt itself should only cost an average price of $60 or so. The labor costs can vary from one mechanic to another. If necessary, the water may also need to be replaced at the same time, which costs around $90 plus the cost of labor. The average labor time for such a replacement is approximately 3.6 hours. This length of time must be multiplied by the mechanic’s hourly labor rate to arrive at the correct labor cost estimate. Replacing the belt yourself makes sense economically, if you possess the skills and knowledge required for such a job.