Extensions on properties

Hello there,

I am looking at a buying a property in Playa Blanca which has been extended. I understand that as the property is over 4 years old the extension which has not been certified will not be an issue. However I would want to put a sun terrace on top of one of extensions but my Solicitor is saying within the next 4 years this could cause me to be told by local authorities to demolish and I could face fines.

Does anyone out there have any knowledge or experience of these rules and how strongly are implemented?

Thanks!!

Andrew