Wow - that is a rare find Mike, thank you, perhaps the alterations were when it became a Manufactory?
Google maps tell me that from there it is 2 miles to the centre of Smethwick and about 1 mile to St Peter's Church, the old centre of Harborne - and all in a straight line - or 1.5 miles to the furthest end of the High St.
Would the Workhouse, Washing-Powder Manufactory or "High Harborne" be mentioned in any directories of the time?
Also I'd like to prove/disprove my theories about the Junction of Upper Ravenhurst and Moor Pool Lane meeting with Gillhurst Road - are there any early C19th maps that you know of. I think Harborne was Staffordshire at that point.