You will need to consider the siding and roofing materials you would like to use to finish this space. And you might weigh the quality of exterior materials against their visibility. Also in the cost of the addition, be careful to factor in the permits needed and the work needed to prepare the foundation.
Envelope size - 4-3/8 x 5-3/4. Card paper size - 5-1/2 x 8-1/2 (half a letter sized sheet). Finished card size - 4-1/4 x 5-1/2. A4: Envelope size - 4-3/4 x 6-1/4. Card Paper Size 8 x 12-1/4. Card finished size - 4-1/2 x 6-1/8.
Notes: Cards cut to A8 paper size can still sometimes be found. In Victorian times a Visiting Card would vary between 3 3/8  x 2 1/2  and 2 1/4  X 1 3/8 . The size and use of such cards was very dependent on Gender, Marital Status and other factors. The specification for International cards is ISO 7810 ID-1, this is the same dimensions as a standard credit card. Remember to bookmark this page -. Folio, Quarto and Octavio: These are paper size terms indicating half-size, quarter size and eighth size respectively.