Detectives believe that the damage to the front window of the house in Anstey Road in Old Swan was caused at around 1am, but was only reported at 11am today.
Officers from Matrix Serious Organised Crime (MSOC) are keen to hear from anyone who saw anything suspicious in the street shortly before or after 1am.
Two males were seen in the area at around the same time that a loud bang was heard by some residents and a silver car was seen leaving the area in the direction of Queens Drive and Prescot Road towards Old Swan.
No-one was in the room where the damage to the window occurred however the occupants of the house were asleep in other rooms.
The house is currently cordoned off for forensic examination and both house-to-house and CCTV enquiries have been carried out.
At this early stage of the investigation, the motive for the incident is unknown.
Detective Inspector Mike Leyland from MSOC major crime team, said: “This is an understandably worrying incident for the people living at the property and their neighbours. They have woken up the next morning to discover the damage which we now believe has been caused by a firearms discharge. I would like to reassure them and everyone who lives in this area that we are taking this incident very seriously and doing everything we can to establish who did this and why.
“Firearms have no place in our community and we are determined to take guns and the criminals who use them to threaten and harm others off our streets. It is only through sheer good fortune that no-one was injured as a result of this incident.”
“Information from the public is crucial and I would appeal for anyone who saw or heard anything suspicious in the street shortly before 1am to get in touch.”
Call the guncrime hotline onÂ 0800 230 0600Â or Crimestoppers onÂ 0800 555 111.