It really depends, where is it located? how many people will be living in it? how much did it cost to build? it is one story or several stories? Over the last 42 years, the average new US house has increased in size by more than 1,000 square feet, from an average size of 1,660 square feet in 1973 (earliest year available from the Census Bureau) to 2,687 square feet last year. In California a 3000 sq.ft home is a medium size for the average family consumer.
If you’re going strictly by size, you’ll find that there is no general consensus among experts. for a large home a good rule of thumb is 5,000 square feet. Technically, realtors term mansions as houses that have at least 8,000 square feet of floor space. Below are some charts comparing how various countries allocate living space. You Compare and see what you think !!
rts below, from http://www.shrinkthatfootprint.com , are a good baseline to start from.