The message
from Dave Fawthrop contains these words:

Go to your local library and look at old maps.
My Son in Law dated his house to a year, but he was lucky.

I tried that years ago. The copy Keighley Library has of the first 6"
survey is a completely illegible photocopy. The librarian was unable to
suggest any earlier maps.

The house dater isn't much use either putting my house date at 1873 with
a broad spread. (1846 - 1900). I know the mean date is wrong as the
house is named on the first 1" map of the area which was based on the
original 6" survey carried out in the main between 1844 and 1850.

--
Roger Chapman