The seal and signature of an architect or professional engineer is required on construction documents for any one or two family dwelling project over _____ square feet.

In Michigan, the requirement for the seal and signature of an architect or professional engineer on construction documents primarily relates to ensuring the safety and compliance of building designs with state regulations. For a one or two-family dwelling project, the threshold set for requiring this certification is particularly important because it signifies that the design has been reviewed and approved by a licensed professional, providing an additional layer of scrutiny to the construction process.

Choosing 3,500 square feet as the limit for when the architect or engineer's seal is necessary aligns with the intent of the regulations to protect public health and welfare by ensuring that larger residential projects undergo this level of oversight. Projects exceeding this size are generally considered more complex and likely to involve greater safety risks, necessitating professional validation.

The other options do not meet the established requirement and would thus not require the same level of professional certification, which is crucial in maintaining safety standards for larger residential constructions.