Hi Curious,
As with most things in Spain there is a high level of bureaucracy. You know what I mean forms, forms and forms and stamps.
I guess that is the case here and professionals are giving their advice.
Unfortunately, as is often the case, if you do not speak good Spanish you need some help. However if you do (speak Spanish) pop into your Town Hall and make enquiries. There will no doubt be forms to fill in and fees to pay but you may be able to do it alone.
I have some experience of facade repairs to Grade II listed buildings in the UK. I can assure you that was not easy either. Materials, style etc. were specified and work supervised. You see bureaucracy in the UK as well.
If you speak Spanish, or know someone who does, enquire at your Town Hall. Failing that you will need professional help.
Good Luck
Mick