In article ,
"The3rd Earl Of Derby" writes:

You could try this...problem is most of the answers you might not know?

I tried it and the house I'm in is almost to the date it gave me, due to
not knowing some of the questions.

http://www.bricksandbrass.co.uk/houseage/ageform.htm

Tried it on a 1909 house, and it comes out as 1876,
with a 2% chance of being 1910.
However, some of the questions were not clear enough,
and in some cases, none of the answers was appropriate.

--
Andrew Gabriel