Costing Ashley nothing
It's not being done for free.
Implication being that the new owners are footing the cost.
only question is why? what would be the point of them doing it in such a hurry? sure there's some easy PR but they could do that over the summer its not as if the new season is next week or next month
They'll want to do photo ops in the ground with out all that SD tat in the background.