It will depend on the fiscal capacity of the municipality, but, as I said, all municipalities go into federal infrastructure programs with their eyes open. Anyone who has renovated their house knows that things almost never go exactly as planned; municipalities know that if the project doesn't go exactly as planned and there are cost overages, they know they are going to be picking up those differences, although obviously if they could budget them, they would be included in the project budget and then covered. Almost anyone who is doing a house renovation keeps a notional reserve so that they know they can cover it.
In the grand scheme of things, municipal fiscal capacity is extremely pressed and property taxpayers are pressed, but specific projects are affordable, yes.