A porch is viewed as a non-enclosed, non-heated structure attached to a dwelling requiring an insulated door between the 2 areas. A building permit is required for such a structure and frost footings are required. See the single-family lot guidelines (PDF) for standard setbacks from your property line.
If a contractor is constructing the porch, the city requires the contractor to be licensed with either the state or the City of Maplewood.
Documentation required when applying for the porch building permit: