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.
General contractor fees can also add to the cost of a screened-in porch. The average cost of a general contractor is between 12.1 and 19.3 percent of the porch price. The contractor supervises the project, which usually takes place over two to three weeks.