I can provide you with some general information and factors to consider when estimating the cost:
Inspection: The first step is to identify the source of the leak accurately. You may need to hire a professional plumber or a contractor to inspect the shower and the area where the leak is occurring. Inspection costs could range from $100 to $500, depending on your location and the complexity of the problem.
Repairing the Shower: The cost of fixing the shower will depend on the nature of the issue. It could be a damaged pipe, cracked tiles, faulty grouting, or a problem with the shower pan. Simple repairs might cost a few hundred dollars, but if there's extensive damage and the shower needs a complete overhaul, it could run into several thousand dollars.
Ceiling Repair: Since the leak has already caused damage to the kitchen ceiling, you will likely need to repair or replace parts of the ceiling. The cost can vary depending on the extent of the damage and the materials involved. Ceiling repairs can range from a few hundred to over a thousand dollars.
Water Damage Restoration: If the water has caused damage beyond the kitchen ceiling, such as to the walls, flooring, or other structural elements, you might need water damage restoration services. The cost can increase significantly in such cases.
Location and Labor Costs: The cost of labor and materials can vary significantly based on your location. Larger cities and areas with higher living costs may have higher labor rates.
Considering the factors above, the total cost to fix a leak from an upstairs walk-in shower into the downstairs kitchen ceiling could range from a few hundred dollars to several thousand dollars. It's essential to get multiple quotes from reputable contractors to get a more accurate estimate for your specific situation.
Remember, timely repairs are crucial to prevent further damage, so it's best not to delay addressing the issue.