I don't understand how they can be automatically registered, as it is a costly process involving architects plans, notary fees etc.
The council isn't going to let people off that!
I know that after a certain period, usually four years, they cannot fine you ,but you are still obliged to legalise the additions
In the case of a conservatory it is a grey area apparently.
Anything which increases the habitable space has to be registered,
Conservatories are usually on a concrete base, so I would presume they do have to be registered.
Another thing, if the habitation certificate is obtaIned many years after the deeds were issued, surely all the additions would have to be registered and the escritura updated before the certificate is issued?