1 In children with food allergies, 30.4 percent are allergic to multiple foods.1. 2  Penicillin is the most common allergy trigger for those with drug allergies. Up to 10 percent of people report being allergic to this common antibiotic.11.  Bad drug reactions may affect 10 percent of the worldâs population.
1 The cost to build a 16â x 20â covered, enclosed porch is approximately $60 to $100 per square foot, or a total of around $16,000 to $32,000. 2  Larger porches generally cost less per square foot while smaller porches tend to cost more per square foot. The cost of a porch could be anywhere from $5,000 for a simple structure or less to $75,000 or more for a sunroom or similar fully enclosed structure. 2  The cost to build a 16â x 20â covered, enclosed porch is approximately $60 to $100 per square foot, or a total of around $16,000 to $32,000.
For the porch addition, the typical costs include: 1  According to Hanley Wood and their Remodeling magazine the average porch addition in which a completely covered and enclosed porch is added to the exterior of a home will cost $21,670. The resale value of this update would hold at $18,181 or a nearly 84% return on investment.