Are you saying that the noise goes away when you touch a screw on the pickup when you are playing in your new house?
Originally Posted by sfrisius
If so, The problem is You. You are not grounded, and because you are very close to the pickup you are "broadcasting" noise to it. (A guitar pickup is a excellent detector of electrical noise.) You could be picking up the noise from a number of places including the neighbors houses.
If this is the case the fix is to first make sure the house wiring is safe. Have it checked, especially the grounds. Next plug in your amp with a good grounded cord. Don't use a "humex" They work by lifting the ground until there is about 5 volts difference between your amp ground and the building ground.
Next, once you know everything is safe, ground your self. Look up wrist ground strap, get one and put it on your ankle.