After the toilet is flushed there seems to be extra noise going on in wall where the pipes are. It only happens in the one bathroom. The noise sounds like the water to refill the toilet is louder than normal. I'm not sure how else to explain it. This just started recently - Our house is only 4 yrs old and I do not believe there have been any previous plumbing issues.

: What you hear is the washer vibrating sgainst the ballcock seat. You can go at this two ways. (1) you can try lowering the pressure by turning the angle stop located below the tank until the noise stops or, (2) you can shut off the stop and remove the three screws on top and cup your hand over the top and just crack the stop enough to flush out any trash that may be in there. After you do that pull the washer out of its holder and flip it over in its holder and reinstall the top and float. One of the two should do the trick. If not click on back and we will go to plan B. Good luck

I will try your suggestions. Thank you for your help