A building permit is required for a three-season porch, which is an enclosed structure, either heated or non-heated, requiring an insulated door between the 2 areas.
Insulation requirements depend on the heating option. Contact a building inspector for specific information. 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. All gas work must be done by a contractor who is licensed for HVAC with the City of Maplewood.
Documentation required when applying for a porch building permit: