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.
Paper & Card Sizes. Paper and card sizes are generally organised through an 'A' system in an ascending sequential order. The main thing to remember is this: the lower the number, the bigger the size â the largest size being A0. For example, A1 measures half the size of A0, A2 measures half the size of A1, and so on.