I suggest that you contact your town government's building department as they may have plans on file as to which contractor constructed your home.
Here is a link ... more
The scope of the work, the size of the job, the materials, and the quality are just too variable:
It could be $150/sqft and it could be $500/sq ... more
Getting permits is not usually a "slow process", and it's necessary to ensure the construction is up to current code and meets the minimum requirements ... more