Very much location dependent. Description alone will make it a crap shoot guess. What is the roof pitch as that will effect the pricing for the material? Windows? Doors? Best bet is ask locally honestly.

Consider contacting a local residential architect to help you determining the best way to meet your nees and respond to your site. You provide a lot of information, but the answer is probably not that simple; and an experienced architect can offer ideas you have not thought of.

Low end, $350 a square. High end, there is no limit. "Simple" looking things are the most complex, and most expensive.

Three comments:

1- The more corners, the more expensive. Dormers add corners. They also have complicated acoustics.

2- Cost of digging a basement space depends a lot on local conditions (soil, drainage, etc.) In my area, you'd have to blast out the granite, so there aren't any basements.

3- You may want to consult a pro before designing the recording studio. Good acoustics and sound insulation are best designed in advance, not retrofitted.

MY first question is what are your actual skills to even begin to think you can do all of this. As for the rest we have no idea what your lot is , where you live and your style. Choosing flooring is way down the list .

I do have the necessary skills to do the vast majority of the work. I've been turning properties for years now, but never new construction (well, I helped build my teenage home, but like a typical teen, I didn't pay attention to my Dad and older brother so I didn't learn much).

@apple_pie_order There are 4 corners not including windows and exterior doors. I'll test a lot before purchasing it to confirm we can do a basement. Basements are very common here so I don't expect this to be a big issue, though there are places here that are very rocky.

A music friend of mine is a pro studio design engineer. We're going to exchange services so that the cost of design is reasonable otherwise I cound't afford it. We've already discussed ceiling height, room shape and angles, decoupling with materials and placement of sound absorption, sound diffusion, traps, monitors, etc. so that's already taken care of and ready to go since we'll be doing it in the basement. We just have to adjust a bit for the basement ceiling height disparity vs. our original plans. We would like 14 ft. ceilings, but will have to settle for 10 ft and adjust accordingly. Once the basement design is done, he and I will finalize the plans before building.

I have several close friends who are plumbers, electricians, framers, and my best friend is a GC. He'll be guiding me through the process and helping me as needed. I'm building debt free so I'm giving myself an 18 month to two year window to complete. It's 1340 ft2 main level and unsure still on the basement size. It will Likely be around 800 ft2, but maybe the full 1340 ft2. It all depends on cost and I have a specific budget I'm trying to stay under.

We'll quickly build a garage with an in-law apartment above and live on site while the house is built. My friends and I are getting together to build the garage quickly. I've helped them out over the years and they're repaying the favor. His wife (architect) will be approving my plan ideas, and helping me if needed. I'm pretty anal about quality work and no shortcuts so that's another reason I'm doing most of the work. I just don't like the shoddy work I see others do.

My friend's costs are $145/ft2 here for spec build minus property costs (about $30 - 50k for a nicer acre lot, cleared, etc.). That's with them subbing out several things. I'll be doing most of the work myself. I forgot to mention that I'll sub out roofing as I'm getting too old to do that any longer and want it up fast. I don't want to risk falling or hurting myself. I'll let the younger guys do that. We also going to do ICF so I'm taking an onsite course to get certified in ICF in a couple of months. I'll have a small crew of friends helping. Once the lot is prepared and basement slab is poured, cured a couple of weeks, we'll do the basement walls ICF vs. traditional poured. Let that set a few weeks and then pour the main level ICFs. I expenses quoted out and is reasonable for 6 in ICF.

Minardi mentioned $350/ft2 and beyond. We're in a smaller town (40k people) middle Tennessee an hour outside of Nashville so even the most extravagantly designed homes are much, much less than $350. I'll hopefully be between $135 - 160/ft2 not including lot costs and prep work. I could see that expense in some places in the US. and, I believe your idea of simple and mine are grossly different. When I say simple I do really mean simple so board and baton fiber cement siding mid-grade flooring, fixtures, etc. There will be some things like coffered ceiling, arts and crafts trim, etc. but I do that all myself and I have access to a lot of wholesalers in my area of the country so materials are less here than many places in the US. The windows are larger so those costs are more, but everything like the roof is 8/12 gable, 4 sides rectangle, three slide out doors and 13 windows. No bay windows. Roof will hopefully be stainless steal, but it will depend on costs. It does have a wrap around porch so that's an added cost, but not that much. Our budget is our budget. I'm not an emotional person and my wife is practical so we value nice, but simple. We're not buying a $4k refrigerator when a $1,8K one will do. We'll have a $100 ceiling fan vs. $450 ceiling fan, a $150 kitchen faucet vs. $600 faucet. I hand make my railing, newel posts, trim and plan on making the front entry doors, etc. We're designing for efficiency, with an arts and crafts look. It will look very nice on the inside, but I'm custom doing all the woodwork, trim, casing so it may look like it was expensive, but the cost is just in time/labor. With no construction loan, time doesn't hurt me. It's a smaller house to retire in when we retire an a few years that's large enough to have family over. Since we've decided on a basement, I'm working on the plans so the software can generate a materials list. I'll then price out every item to get a detailed cost analysis.

You have a lot of resources. The structure is a box. Start drawing on graph paper. Post some layouts of interior rooms. Let us know the location for climate. Directional orientation. Lot size. When you have nailed down the design, Draw it to scale using STAEDTLER 18" x 24" Vellum Paper With Title Block (10 ct) Delivery or Pickup Near Me - Instacart You can get prints and show it to your friend's wife. I'd go with the basement version.