Let me look into my crystal ball...
Before we start, let's acknowledge the fact that this is a bit of an unfair question. It's a little like asking, "how much does a car cost?" or "how much does a meal cost?"
That being said, I can help you work toward your answer. Your project cost is basically a function of simple arithmetic: Project Cost = Sum of:
Materials
Labor
Professional Support
In my experience, using reputable contractors and skilled tradesman, each bullet point represents roughly 1/3rd of the total project cost.
Therefore, particularly on smaller projects, if you tally up your material costs and multiply that number by 3, you will get a rough approximation of what your project will cost.
Example - Kitchen Remodel (This is an actual project completed in Long Beach, CA in 2021)
Materials:
$10,000 - Cabinets
$5,000 - Appliances
$1,500 - Countertops & Tile
$1,500 - Plumbing Fixtures
$1,500 - Lighting & Electrical
$1,000 - Flooring
$1,000 - Hardware
$2,500 - Rough Materials (Lumber, Drywall, Paint, Etc.)
$24,000 - Total Material Cost X 3 = $72,000
That's a BIG number. But fear not! If you're inclined (as I am), you can do the work yourself, get the deep satisfaction of having built your home with your own hands, and save a boatload of money!