Well, where NOT to look is greedy Home Advisor or Angi and then there's that yellow dog Yelp ... all Self Serving, not looking out for you. Even the BBB has become this way with a blind eye toward the really gad, taking in money is the goal of all above.
https://indreg.tbae.texas.gov/Reports/IndividualSearchis a beginning and what you want to query is
RESIDENTIAL SPECIALIST
Avoid commercial architects that will give your bone to their new dog apprentice to cut his teeth on, with mistakes being corrected by 1-2 others in the firm, all charging fees.
Avoid design-builders with in-house "architects", whose hands will be tied and your options limited to what the boss builder wants to do that's EZ & high-profit.
Ideal would be a true licensed architect firm with less than 3.
That said, finding a REMODELING EXPERT builder that is not distracted by other types of building depends on an architect to finish up designs he begins might be shortcut, however limited your options may be
Short-hand answers here ... long-hand help here ....
http://pages.suddenlink.net/tgivaughn/