Also, these enclosures may be affected by zoning code requirements. Once again, don't rely on the precedent of vestibules and porch enclosures built in the past. Experience has shown that many of these are inappropriate. When vestibules or porches are enclosed, they should complement their buildings. For instance, if your building has a very simple design, add a simple enclosure devoid of ornamentation or decorative features that dress up or call attention to it.
Inappropriate enclosures confuse the architectural record by imposing false histories on buildings.
Investigate whether the porch you intend to enclose will be considered a new permanent interior space under the zoning code. In the case of a front porch, it may fall forward of the required minimum setback and require a zoning variance. Porch enclosures should leave the original porch as intact as possible to maintain its open feeling. Enclosures should have as much window space as possible, rather than solid walls. They should be constructed behind any original porch columns, so that the columns remain visible from the exterior.