Determined by the amount of the job and the property, sewer leaks can cost from as little as $600 to over $50, 000. The price depends upon the nature of the sewer problem, the location of the sewer lines, the place of the home or building and the condition of the sewer lines. Then a major sewer repair may be required if your house has old iron lines that have largely corroded away. The only accurate means to find out is to have a camera inspection of the sewer lines.