You can't price out a house by square foot.

It all depends on what you're adding? Builder basic or high end?

Get bids from several contractors in your area. Those are the only real costs...the ones you would have to pay.

Whatever the price is there's going to be a wide range. I tell my clients that trying to price out a house by the square foot is like trying to price out a car by the pound. There's a lot of difference between a Chevy and a Lexus.

Have you tried the app called Zillow? There are options to search for new homes that haven't been built yet.

Because you didn't feel the need to select a city, (why not?) I picked fort Wayne. For a 2000 sq. ft. basic house with two roof lines without ceiling height changes 8' high the price would be $412,000. Bumping it up to 9' would add $8K to the price.

OK want a nicer house? A typical house you normally see built with 9' ceilings and 6 to 9 roof lines will cost you $$492,000 Bump them up to 3000 sq. ft. and the price of the cheapo basic would jump to $528,000, and the typical jumps to $620,000, and a better deal per sq. ft. adding only $120K to the price for a 50% increase in size. These prices are without a basement, decks, and one bathroom.

OK I used a house cost estimator so I cheated but you can use it too and get an idea the costs involved by adding bathrooms with sizes, deck sizes, and change just about everything to your wildest desires to get an idea of price. House cost Estimator, have fun.

This cannot be answered on here obviously. IMO you have 2 choices go some stock plan from the internet that does not quitie fit the bill or get an architect and build a house that works perfectly for you. Either one will cost big bucks to build and there is no way to find out how much without gettting quotes from builders in your area.

Cost/SF is a simple metric, and one which is used by Realtors, appraisers, bankers, homebuyers and some builders. The problem is that it is affected by so many variables including the size; style; construction; materials; systems; level of detailing in the home; site-specific costs for clearing and utilities, etc. that it's not particularly useful.

Trying to infer the cost to build a home using a cost/SF metric is likely to get you in trouble. I suggest benchmarking is a better approach. Look at newly constructed homes offered for sale in your market that are the style, size, and quality level you expect and compare them with your budget. Expect to pay a premium to build any on a custom, on-your-lot basis.

Cost/SF is a great way to see if you are even remotely realistic about costs and if you can bank roll a build. But that’s all. We saw it as a starting point and it for sure helped us eliminated some builders from our project as they just were too high end. I would meet with a few builder and get a sense of what they offer and for how much, with the caveat, that they will be giving very general info that you then need to vet yourself. But it’s a starting point