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Yes, onyx is more expensive than granite. Its higher cost is due to its rarity, delicate nature, and the specialized care it requires. While granite countertops typically cost between $2,000 and $4,000, onyx is considered a premium material. Its luxurious, translucent appearance and unique ability to be backlit also contribute to the higher price. In terms of durability, granite is a hard, durable surface, whereas onyx is more delicate and can be damaged if not handled carefully.

The average cost to install or replace countertops is $3,105, with most projects falling between $1,858 and $4,177. However, the total price can range from $400 to $8,500 depending on several key factors. The most influential cost factors include the countertop material, the size in square feet, the quality of the new countertops, and the complexity of the job, such as the number of sink cutouts, corners, and special edging. Other considerations are the accessibility of the installation area and whether the project includes the removal and disposal of your old countertops. You have a wide array of material options to choose from. Laminate is generally the most budget-friendly, costing between $8 and $27 per square foot. On the higher end, slate countertops range from $30 to $90 per square foot. Other popular materials with varying price points include butcher block, quartz, granite, stainless steel, Corian, and wood.

A minimum overhang of 10 to 12 inches is generally recommended for countertop or island seating to provide enough legroom. For increased comfort, an overhang of 15 to 18 inches is ideal, allowing for more space and a relaxed experience. However, a 10-inch overhang can be sufficient in certain situations, such as for bar-height countertops, when using small stools, or in smaller kitchens where space is limited. Taller countertops may also require less overhang than shorter ones. Ultimately, you should consider your specific needs for legroom and measure to ensure the overhang fits comfortably within your kitchen's layout.

No, you don't have to apply polyurethane to butcher block countertops. Polyurethane sealant is a long-lasting finish for a butcher block counter, but its application also requires thoroughly sanding the surface multiple times. Other materials, such as mineral oil, require less work but must be applied more frequently.