How to declare tax on renovation work

[Jeffrey]

Please could someone advise ?

We bought a house, (liveable) two houses destroyed by fire (walls remaining no roofs), old large house in need of total renovation, barn & studio (that the original owner had used and fitted patio doors and windows etc)

We got the appropriate planning for the barn and filled in the forms that were sent when work was completed incl. form for tax, 2005 we asked the Marie's secretary what permission we needed to renovate one of the houses destroyed by fire, and in 2006 what permission for the artists studio, she said that we did not need any permission.

If we were to sell the property which we run as gites, would we be liable for any extra tax and was the secretary correct?

Any advice greatly appreciated.