Final answer:
To determine if a farmer can build an addition without an engineer's encroachment review, they should consult with local building codes and zoning laws. If the addition meets setback requirements and floodplain regulations, it may be possible to proceed without a review.
Step-by-step explanation:
In order to determine if a farmer can build a small addition onto his farmhouse without needing an engineer's encroachment review, it is important to consider the regulations and guidelines set forth by local building codes and zoning laws. These laws vary depending on the location, so it is best to consult with the local building department or a qualified engineer familiar with the specific area. Generally, if the addition falls within the permitted building setbacks and does not violate any floodplain regulations, the farmer may be able to proceed without an engineer's encroachment review.