Keep in mind, a deck this size was quoted by other companies ranging between 7k and 12k. We saved a lot going through the process ourselves as far as getting the material and then finding someone to do the labor for a reduced cost versus what was quoted by others.
Permit wasn't that much of a pain but it may take time and they require some additional drawings and markings, which I think can also be done at HD or Menards. They are only checking the Deck aspect, though our grading isn't much to worry about.
If you can do the labor yourself, deal with the permits, and go through all the materials yourself you can get something comparable to our size wise for a range of 1700-2500 based on lumber selection, options for skirting, railings, and nails vs screws. Plus it depends on how many holes need to be dug and filled with cement. Composite would be more as well. If you plan to be in your house long term spend the $ on composite, if under 7 years, just do green treated and only need to deal with staining 1 or 2 times before moving.