The price of a home depends on several factors:
Location
Square footage
Design
Energy efficiency
Flooring
Moldings
Tiles
Light fixtures
Bathroom fixtures
Fireplace
Kitchen appliances
Oil heat?
Propane heat?
Air conditioning
Roof materials
Landscaping
Garage (s)
Hardscaping
Gravel or paved driveway or maybe cobblestone
So, you see, there is going to be one price for a house built with Home Depot appliances, bath fixtures and lighting fixtures with inexpensive flooring and formicacounter tops....compared to a high end kitchen with top of the line appliances, a tiled floor and quartz countertops, cherry wood floors, crown mouldings and spectacular light fixtures.
Check out the internet for the average square foot price to build a house in city xyz.
Also, if you are really going to have 6 bedrooms, an office and weight room, two bathrooms is not going to be sufficient. So, consider another bathroom near the basketball court and exercise room...with a large shower.