The houses are of brick or unpainted wood.
It is generally inadvisable to apply linseed oil, stain or vanish to unpainted oak doors.
The unfinished renovation project had left the laundry room cattywampus; the washer and dryer were unhooked, the walls were unpainted and the sink was disconnected.
I found the outside window trim, the garden trellises (now purple and stunning), the inside window trim on my newest room that somehow was left unpainted and has hidden for two years behind draperies, and lots more.
Avoid unpainted hardwood and UPVC windows and doors as they always look phoney.