YoMo2 wrote:That is probably a good thing since a large structure might involve you in building permit.......
......... and, possibly, additional property tax. If done without a building permit there's a high risk of the property being declared "illegal" with, at some stage, paying for legalisation. We had an holiday apartment built beside our house and originally didn't plan to have CH but towards completion changed our minds (pipework was already under the floor). The builder added a small structure (2¼m² x 1.5m high) to a rear corner of the building. We completed the sale about three months before the legalisation requiring legalisation was enacted. We were lucky that the buyers (a Greek family from Athens) were not concerned about the (about to be) illegal status and, in fact, since they've owned the place both house and apartment have become even more "illegal" with alterations and extensions to both buildings.