The purpose of the survey is to establish the boundaries of the lot and locate where the house is on that lot. That is all; beyond that, it is not used for construction purposes. If the house being built is located as the survey describes, I see no issue. If the length or width of the house disagrees with the survey, that would be something that probably would need correcting. I suspect the engineer drawing up your survey was using standard callouts and not paying attention to the specific details of your construction.

Thanks a lot. Should I insist the builder on getting it corrected before closing?

There are a variety of survey documents used for permitting and construction purposes. Most lenders will require a "final improvements survey" which documents that the home, driveway and any other improvements are within the allowable building envelope and that there are no encroachments into any easement.

The survey is also submitted to the assessment office and the square footages are taxed, so yes, wrong dimensions make a difference.

Boundary survey

The boundary survey establishes the perimeter of a property as it relates to a site's legal description.

Site-planning survey

A site-plan survey is used to plan the development of site improvements. The proposed building, or other improvement, is drawn inside of a boundary survey. A site-planning survey is normally used when applying for building permits.

Construction survey

A construction survey involves the surveyor staking out the location of planned structures and improvements. The surveyor does this to show construction workers where to build and the distances between planned improvements.

Go to the building department and ask for someone to explain all this to you. The builder would not get a permit unless all was in order. Then, the building inspector visits the site to inspect as the work progresses.

My recommendation: before you sign off on the house, have your own inspection done. It will cost you a bit of money, but it is worth it, IMO. Just because the house is new does not mean that it is perfect in all respects.