Average Hourly Cost: The average hourly cost for a marble staircase installation in the marble contractor category is around $90 - $150 per hour, depending on the complexity of the job and the type and quality of the materials used.

Cost Breakdown: The cost of a marble staircase installation can vary depending on the size of the staircase, the type of marble used, the complexity of the job, and the service provider. Generally, the cost of the material ranges from $200 to $1,000, while the labor cost is usually between $200 and $1,500. Other factors that can affect the cost include the location of the job and any additional accessories or services required.

Factors Affecting Cost: Several factors can affect the cost of a marble staircase installation. The type and quality of the marble used, the complexity of the job, and the location and service provider can all influence the cost. Additionally, the cost of any additional accessories or services required can also affect the overall cost.