The original floor was a poor concrete skim over a loose packed clinker base at best.
A pickaxe soon sorted it out and the rubble was shoveled straight out of the front windows.
The renovation would be divided into two parts: the original house, and the 'kitchen' area which is totally detached from the original house.
This would be rebuilt and incorporated into the main structure of the house. A bathroom would be formed in the original house.