If you could entertain the idea of wooden major support columns it would cost a lot less...you wouldn't need to involve geometras, structural enginers, geologists, the provincia etc etc whose professional fees would far exceed the cost of the proposed loggia! It could also be considered a 'temporary' structure thus absolving you from any increases in ICI or catastal registration fees.

That's very interesting. I assumed as it has a tiled roof that made it a permanent structure. Will see what can be done. Thanks for the response.

Whether it is in wood or tiled may or may not affect the 'temporaneita' of the structure - but basically a loggia is a permanent structure and you will need a concessione to do it.   You will have a metrage that is around 30% of your overall cuabtura that you can use without running into problems, as it is technically a verandah.  Again, this all depends where you live. 

it will cost the same as an extension of the same area but without the windows....nd you need a professionista to do all the paperwork. 

Thanks for this Ram. Am surprised at your prediction re costs. Had assumed it would be considerably cheaper as no foundations/walls/flooring etc required.

The whole thing about whether it is 'temporary' is a bit political. Ram is strictly correct (though there are also different rules depending on your comune/land status) but the 'average Italian' will consider the costs of making 'a loggia' legitimately, or throwing up a shade structure and enjoying the shade for as long as it takes some catastal CCTV to challenge it. (The thought process goes "if it costs me a couple of thou I can demolish it to 'clear myself'. If I build it with all the structural cr@p it will cost me twelve thou", and I don't have twelve thou.)

Well, regarding foundations - when i did mine, I was advised to bung down 20cm of reinforced concrete base, I did have little walls and a floor - and it had a cotto floor - so not the cheapest.  But it all depends what you want and how you do it.   I suppose if you left it lets say lawn for the floor then you could do without permissions... 

I was always told that if a building had a bolt in it then it was temporary, in the sense it could be dismantled.  However, recently even a caravan has been classed as permanent and you need a licence to put one in a cantiere.  A wooden shed is permanent in come cases but a bloody great Dutch barn is temporary.  It all depends - but its worth doing it properly and choosing well would bring down the cost substantially.

we were told if  a structure had a concrete base  ( ie a garden shed)  it was permanent and for loggias if it had a solid roof it was regarded as permanent. I suppose that could be why you see some with sailcloth type coverings. However, as has been suggested, I suspect it varies from comune to comune and  if you want to be legal you need to check locally for their own particular interpretation of the rules.