I have no idea what labor is in your part of the country, but as a contractor that has build a few homes, I can say that for me, it's about $60 to $70 a sq foot to build a decent all brick house. For fancy, it's goes up to $100 a sq ft. Cost is all in the finishes used, how much trim, types of flooring and cabinets. According to one of the trade magazines that I get, one third of the cost to build a house is materials, the rest is labor. The goal of all the big home builders is to get labor costs down. My goal when building spec homes was to make $10 a square foot off a house when it's sold and everyone is paid. Sometimes I made $12 a foot.
While I understand that Architects serve a purpose, in every case that I've dealt with them, they are a waste of money in building a home unless you have a really unique design in mind, or the location requires it. Just about every floor plan imaginable has already been drawn, and it's probably on a website somewhere already. I like
House Plans, Home Plans, Floor Plans and Home Building Designs from the eplans.com House Plans Store | Garage Plans and Blueprints but will look at others too for ideas.
Step one when building is to decide what you have to have in a house. You seem to be doing good at this with your other posts.
Step two is to find the builder. Be careful of hiring the "best" because that's a red flag for me. Find the guy who has a great reputation, who is constantly busy, and runs a clean build site. I think you already said somewhere that you have family who builds houses, so that might be a done deal.
Step three, have your builder draw up your plans. If you need a permit, he will know who to use to get that done for the best price. The advantage to having your builder draw up your plans is he knows how to engineer it. What is available to make the span, and what it will cost to do that. Your Architect may or may not understand framing. You won't find out until the build starts and things start getting expensive and impossible. With every house, you start out with a box and then make it more complicated. How complicated you make it, is where a lot of the time comes in, and where the money goes. Mobile homes are all rectangular and extremely well designed and laid out for maximum use. They are crap, but the floor plans are genius for the space available.
Your builder will know in seconds after looking at a blue print if you are wasting a ton of money on some feature that really has no value to the house. An Architect wont, and is usualyl responsible for adding that wasted feature.
Back in CA, where I'm from and we have a lot of earthquakes and all the easy to build on land is long gone, it can cost $300 to $400 a foot to build a tract home. $500 a foot isn't uncommon for custom.