Oooo... cost per square foot... there really is no "normal" for that, all architects and builders with experience in high quality work cringe when asked because those who don't do the highest quality work will always insist it can be done for less... and who are you going to believe, the person who quotes an "outrageous" number or the one who tells you what you'd like to believe is true? There is so much that goes into a square foot cost that you don't see, you can't compare apples unless you know what's in the builder's quote. For example, the flooring is 5/4 x 6 #1 kiln dried pressure treated pine with concealed fasteners, primed on all sides before installation, painted with high quality deck paint and sloped to drain.. that's way beyond how most decks are constructed. My guess is that it's 3 times more expensive than 1x6 spaced decking. Other things you see in the photo are of similar quality. We have the ability to design to budgets and most of our clients, if they take the time to let us explain the difference, understand that there is a big difference in common construction materials and techniques and what you'd want to have in your house if you knew about the difference. I've found most people have tuned out by this stage and what they hear is "...blah, blah, blah, these guys are way too expensive!" (Sorry to rant.)

As a rule of thumb, screen porches generally run from 50% to 75% of the cost of the heated square footage of the rest of the house.

Awesome information! Thank you for taking the time to explain!