Generally, an updated survey will be required by the bank when a plot of land is sold or refinanced. If you are subdividing, you will need a survey to submit to the town planning board for approval. You may also need a survey if you are building new improvements on your property, such as a house or a fence. Getting a survey done ensures that all parties involved have an accurate understanding of the size and extents of the property in question and help to avoid unwanted conflict and confusion.