Johanna: Thank you for contacting Porch. The cost to repair a leaking tub faucet depends upon cause. Sometimes the valve cartridge or washers can be replaced successfully and repair might be $150-$250. Other times the valve is just too old to repair and a replacement is needed. This could cost $350 to $800 depending upon access and type of valve chosen. Call us at at 855-494-5972 or 800-604-2454 and we’ll be happy to help you locate a local professional to assist with your plumbing needs. Or you can use our online locater and input your zip code here: https://porch.com/near-me/plumbers