How to tell if someone is in your house? And what to do when an intruder's in your home? First, let’s make sure there really is someone in the house. But you should be very quiet in case there’s a burglar. Look outside the house to search for traces. Can you see anything suspicious? Is there an unknown vehicle close to your house? Maybe you can spot some footsteps or a broken window? Was the fence gate open? There might also be hints inside the house. | Health is Wealth