Absolutely not! If you do install without a building permit it will hinder the sale of your house. The real estate title company sends an inspector to look at all exterior home improvements. If there is a screen or fence without a permit, it will hinder the sale.
The building permit is always the responsibility of the contractor. Never allow a contractor to do work without a building permit.
Yes, its great for protecting your skin against skin cancer and the sun’s UV rays.
Most definitely, you need a building permit. It is the building code and for your protection confirming the contractor’s license and insurances are up to date.