It depends very much what country you are in and the OP does not tell us.
In Australia it depends what state you are in and even then much of the law WRT to UAVs is untested
Yes, there are big differences in drone laws between states in the USA. Everyone should double check where they live because many states have passed laws in last three years:
Consider this excerpt from Florida law:
(b) A person, a state agency, or a political subdivision as defined in s.
11.45 may not use a drone equipped with an imaging device to record an image of privately owned real property or of the owner, tenant, occupant, invitee, or licensee of such property with the intent to conduct surveillance on the individual or property captured in the image in violation of such person’s reasonable expectation of privacy without his or her written consent. For purposes of this section, a person is presumed to have a reasonable expectation of privacy on his or her privately owned real property if he or she is not observable by persons located at ground level in a place where they have a legal right to be, regardless of whether he or she is observable from the air with the use of a drone.
Consider this excerpt from Idaho law:
(2)
(a) Absent a warrant, and except for emergency response for safety, search and rescue or controlled substance investigations, no person, entity or state agency shall use an unmanned aircraft system to intentionally conduct surveillance of, gather evidence or collect information about, or photographically or electronically record specifically targeted persons or specifically targeted private property including, but not limited to:
(i) An individual or a dwelling owned by an individual and such dwelling’s curtilage, without such individual’s written consent;
(ii) A farm, dairy, ranch or other agricultural industry without the written consent of the owner of such farm, dairy, ranch or other agricultural industry.
(b) No person, entity or state agency shall use an unmanned aircraft system to photograph or otherwise record an individual, without such individual’s written consent, for the purpose of publishing or otherwise publicly disseminating such photograph or recording (emphasis added).