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.
Absorb any moisture. Clean light deposits of mold, scrub the surface with warm water and detergent using a stiff bristle brush. Heavy deposits of mold can be cleaned with 1 cup of bleach mixed with 1 gallon of warm water. Dry the area completely. Allow to dry for 24 hours to ensure all moisture is removed before beginning repair work.