Make sure they put a normal breaker in the garage sub-panel and a Spa Gfci breaker out by the hot tub somewhere in eye shot of the tub but no closer than 5 feet from waters edge.(Not sure what amperage you will need, your electrician will know, but 50 amps is normal for most 220v spas) Also, make it easy to disconnect the electrical in case it has to be moved in the future for repairs, etc. I like seal tight conduit going into the tub.