Thinking of changing ownership of my apt to joint ownership with the wife. Anybody have any ideas as to
procedure, cost or timescale.
Think this is a job for an abogado. Why not ask the one you originally used for the purchase?
Why not ask the Notary who completed the transaction for you. May be quite easy, I don't know.
I googled your answer out of curiosity and found this article. It is quite old and i am sure the taxes etc are different now but it may throw a bit of light on the subject. I think you need advice from a professional to clarify your individual situation. http://www.interlex-spain.com/pdf_download4ef9.pdf
On reading that article from fifi it is quite obvious that you do need to consult a Spanish lawyer to try & minimise the financial impact as much as possible