Here is a message by Dave Moore on the Canal World Forum in 2016I recall Allens Yard in Oldbury. My dad worked there when I was young. It was almost a replica of the boat builder’s yard at the Black Country Museum.
I have a feeling hat there is information about Allen’s Yard on the internet.
Presumably there must have been a lot of boat repairing as well as building.The earliest reference I can find for a boat builder within the Birmingham area is in 1783… Robert Baker, Boat Builders
at Old Wharf. (Also mentioned as Sheep Cot Lane Wharf in 1795, and the Dock, near the Crescent in 1793.)