I have an excellent and reasonably priced contractor who built out my entire store, I can send you his info by e-mail if you want to send me a private message. I don't think he speaks english though, so your spanish will have to be pretty good to communicate.
Try this guy, Alfredo - 1568456256, he did a good job building an extension on my terrace, was originally recommended to me by a friend here who's an architect.