A six-year-old girl and a 36-year-old man were discovered deceased at a property on Harburn Drive, West Calder, on Monday afternoon.
Police responded to a report of concern at about 4 pm and, with assistance from the Scottish Fire and Rescue Service, gained access to the home.
The circumstances surrounding the deaths remain unclear, with both being treated as unexplained.
Post-mortem examinations are expected to provide further insights, and the families of the deceased are being supported by specialist officers.
Local authorities confirmed the incident is unrelated to Parkhead Primary School, which is in the vicinity and remains open.
Police Scotland has assured the community of a continued presence in the area as extensive investigations progress.
Residents are encouraged to share any information or concerns with officers on site.
The Scottish Fire and Rescue Service confirmed their involvement in facilitating entry to the property and reported their operations concluded within an hour.
