Why would expect a grant for this work? Possible she or you can get a mortgage if you have the credit and income to quality. If the roof caved in the building may not even be salvageable. You need to first start with the feasibility oft he project and if you need a grant then you cannot afford the project. Where is this project located? Is there a local architect or engineer that can offer advice on the stability of the home and if restoration is even possible?