My advice, get more than one quote & check references.
Price per sq ft depends on the materials granite counters tops, jetted Garden tub the upgrades ad up Quick .Where you build makes a difference may need extra engineering .Check with County or City before you start .
The price per sq ft in Yuma ,AZ is about $85 a sq ft for standard track house construction and can be $125 to $165 for semi - custom . If you have your own lot it is best to get bid from a few builders on a standard build , then ad in the extras . The builders are hungry now and will work with you to keep costs down.