A man and a woman were found dead at a house in Branston on Monday morning.
Police remain at the scene of the brown brick bungalow on Lincoln Road in the North Kesteven village south-east of the city.
They were called to the property at 11.13am on August 5.
A red Dacia Logan MCV, believed to belong to the occupiers, can be seen parked outside the house.
Lincolnshire Police did not identify the victims.
The force is yet to say whether their deaths are suspicious or not.
The entrance to the home is cordoned off and several police vehicles remain at the scene.
Officers are also carrying out door-to-door enquiries in the area.
A Lincolnshire Police spokesperson said: “We are in the early stages of our investigation but would encourage anyone with information to call us on 101, quoting incident 135 of August 5.”