Miguel can do what ever you want, the range for construction is $30-75 per/SF all depending on what level of finish is needed.
I had him do a 300sf addition, 1 bath, 1 bedroom and a hallway which he did for $7,000,
I supplied all the finish items (vanity, fixtures, tile, paint, roof paint, electric trim, etc)
He did all the construction, installed the finish items, tile and painted it for $24 a foot.
(6" block, sand finish stucco, 6" foam roof/ceiling and knock down texture interior walls.
It cost me $1,500 for all the items he didn't supply. That was 3 years ago
Last year he did an addition for an investor with a Boveda ceiling, 12x15ish (it was probably larger) I believe it was under $3000 for the ceiling part).
He does all the main construction and subs out the Boveda work to 3 guys who are really fast doing all the brick work..
He then does the concrete topping and water proofing a few of days later.