Costs really vary in different areas and they are always changing . You would be best to talk to 3 local contractors who have good reputations and ask them what their building costs are. When you say "interiors" do you mean furniture? Or the interior finishes? The contractors will be able to give you the interior finishes numbers, but you can talk to a few local interior designers for estimates on furnishing a house. Also, ask the contractors about landscaping costs. Do you want a pool or an outdoor patio? Or just planting? Plus the building permit costs in your area. Check with the local building department. Some areas charge school fees.............. It would be great if you could factor in an architect to help you pull all of this together. Also this should be an architect who has great references and is known for working within budgets. Once again, you should ask 2 or 3 for proposals to see how they price their services. It can vary.

Why don't you go through the photos tab at the top of the page looking for homes that appeal to you?

If you are indeed serious, you need the services of an engineer, for starters.

Get an architect