In article , Mick6
wrote:

The walls of our 1930's house appear to be thinner upstairs than
downstairs, most obvious on the landing where there's a shelf / second
window sill:

http://tinyurl.com/3a8tuo

My house is a former farm foreman's cottage dating from 1919 and it is
if very similar construction. The ground floor walls comprise a
conventional nine inch solid wall with an inner single brick thick
inner skin, while the upper floor is just a nine inch wall, externally
rendered and pebble dashed.

Adrian