Officers from the Kent and Essex forces have been searching the house in Irvine Drive, Margate, since Monday.
The body of Vicky Hamilton, 15, was found in the back garden on Monday and the body of Dinah McNicol, 18, was found on Friday.
Police searches have included using ground-penetrating radar in the garden and house.
Police search officers and archaeologists removed the topsoil down to the subsoil in sections.
The search at the property has involved lifting the patio and excavating the ground.
After Miss McNicol's body was taken away from the house, her father said he could "die in peace" knowing she had been found.
Neighbours on Irvine Drive have reacted with disbelief at the discoveries at number 50.
On Saturday, the search continued with more sifting of soil and the drilling of concrete floors.
Nicola Downing, accompanied by her boyfriend Mark Drage, returned to her home briefly on Saturday to point out any alterations to the property.
In a statement read to reporters by an Essex Police press officer, Ms Downing, who has lived at the house for 12 years, spoke of her "nightmare".
Flowers left at the scene included some laid by Lothian and Borders Police detectives on behalf of the family of Miss Hamilton, from Redding, near Falkirk.