It may possibly mean "Private"?
What was the actual address given?
Annie
Having obtained the census image from SP, it looks like "Pr House" is simply a private house, as every address on the page is listed as such - apart from "The House of Michael Bruce Poet".
So it seems with no addresses as we know them today in these rural areas, unless there was some way of identifying a specific house, it was simply labelled "private house".
I do keep trying to use sources other than SP for different perspective or to manage costs, but time after time - and often after wrangling with poor transcriptions etc - I find there is no substitute for seeing the actual document.
Thanks everyone - sorry for the wild goose chase.
Stewart