Don’t know if you have received the answer you want, but depending on the area you live in I know of two excellent builders. One of them has his own Spanish Architect who does all the preparatory work, obtaining of licences etc. They itemise all work to be done and then they sign a contract of works so that both parties know exactly what they are paying for and the service they are getting. (Contracts are in English and Spanish)
They have an excellent reputation. They aren’t the cheapest but they do exactly what they say they are going to do and will not take on a job that needs to cut corners. They also, I believe, guarantee their work and get sign off by the ayuntamiento when the works are finished.
If you let me know where you are I can let you know if they cover this area and put you in touch with them