1 Total costs (materials plus shipping and labor) for installing a straight, return or L-shaped stair can run $1,300-$7,000 or more. 2  Materials plus labor for custom-built wooden stairs, such as a sweeping circular or elliptical design, can cost $10,000-$30,000 or more, depending on the size, style and type of wood.
Make another bleach solution and pour it onto the driveway. Wait 20 more minutes for the bleach to kill the mold. Rinse the driveway thoroughly with a garden hose. Prevent future mold with a borate solution. Mix 1/4 cup of borate detergent with 1 gallon of warm water in a bucket. Pour the solution onto the driveway and allow it to dry. Don't rinse it.
1 Dry wet areas within 24 to 48 hours to prevent mold growth. 2  Fix leaks and seepage. 3  The ground should slope away from your house. 4  If water is entering the house from the outside, your options range from simple landscaping to extensive excavation and waterproofing.