Re the 3% sales retention, in 2011 I paid €350 (in addition to the conveyancing fee) for a lawyer to submit forms 211 & 212, which he did. Then I was asked to pay another €200 for him to visit the Tax Office in Malaga to get the refund. Nothing happened.
Last year, I went to another lawyer who charged me €605 following new information provided by the Tax Office in Malaga when I visited them. They now admit that I am indeed due a refund in full but nothing more has been heard from them.
Hope this helps in terms of cost guidance.