When I did mine, I made sure to ask if a permit was required - Super Brothers https://superbrothers.com/ made that part very easy. I also checked the placement because I didn't want it blocking the storage space. Oh, and make sure they added all the safety features - a drain pan, shut-off valve, and seismic straps if needed. It's just good peace of mind to know that everything is up to code and done right the first time.