Various floats turn northbound into Fulham Palace Road from Colehill Lane. The pictures were taken while standing on a wall where the garden centre now stands
Uncertain as to the nature of the work but I am assuming it relates to post-war reconstruction. The Wiki page states:
“The house was largely destroyed by German firebombing during the Blitz in 1940; today only the east wing and some ruins of the ground floor still remain.”
It seams reasonable to assume this construction a decade or so later was part of the process to ensure the buildings standing.