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A General Aviation aircraft is never required to be pressurized. The only reason to pressurize an aircraft is profit.

Pressurized aircraft are built because they can generate a profit for the manufacturer. Any aircraft can be made with pressurization but it comes with a price. If marketing determines it will sell, they will build it with pressurization.

You can look at pressurization as simply a comfort option. A comfort option that comes with a price.

There have been many cases of aircraft being built in both pressurized and un-pressurized versions.

The Cessna 402 and 414, Cessna 335 and 340, Cessna 210 and P210, Piper PA-31 Navajo and PA-31P Pressurized Navajo are all examples of the same aircraft built in both pressurized and un-pressurized versions.

In all these examples the un-pressurized aircraft can fly well above 20,000' but is generally operated at lower altitudes due to the inconvenience of using supplemental oxygen.

An aircraft is never "Required" to be pressurized. The only reason to pressurize an aircraft is profit.

No one would ever buy an un-pressurized Phenom 100 or B777, but there is nothing stopping you from building one.

Pressurized aircraft are built because they can generate a profit for the manufacturer. Any aircraft can be made with pressurization but it comes with a price. If marketing determines it will sell, they will build it with pressurization.

You can look at pressurization as simply a comfort option. A comfort option that comes with a price.

There have been many cases of aircraft being built in both pressurized and un-pressurized versions.

The Cessna 402 and 414, Cessna 335 and 340, Cessna 210 and P210, Piper PA-31 Navajo and PA-31P Pressurized Navajo are all examples of the same aircraft built in both pressurized and un-pressurized versions.

In all these examples the un-pressurized aircraft can fly well above 20,000' but is generally operated at lower altitudes due to the inconvenience of using supplemental oxygen.

The only reason to pressurize an aircraft is profit.

Pressurized aircraft are built because they can generate a profit for the manufacturer. Any aircraft can be made with pressurization but it comes with a price. If marketing determines it will sell, they will build it with pressurization.

You can look at pressurization as simply a comfort option. A comfort option that comes with a price.

There have been many cases of aircraft being built in both pressurized and un-pressurized versions.

The Cessna 402 and 414, Cessna 335 and 340, Cessna 210 and P210, Piper PA-31 Navajo and PA-31P Pressurized Navajo are all examples of the same aircraft built in both pressurized and un-pressurized versions.

In all these examples the un-pressurized aircraft can fly well above 20,000' but is generally operated at lower altitudes due to the inconvenience of using supplemental oxygen.

A General Aviation aircraft is never required to be pressurized. The only reason to pressurize an aircraft is profit.

Pressurized aircraft are built because they can generate a profit for the manufacturer. Any aircraft can be made with pressurization but it comes with a price. If marketing determines it will sell, they will build it with pressurization.

You can look at pressurization as simply a comfort option. A comfort option that comes with a price.

There have been many cases of aircraft being built in both pressurized and un-pressurized versions.

The Cessna 402 and 414, Cessna 335 and 340, Cessna 210 and P210, Piper PA-31 Navajo and PA-31P Pressurized Navajo are all examples of the same aircraft built in both pressurized and un-pressurized versions.

In all these examples the un-pressurized aircraft can fly well above 20,000' but is generally operated at lower altitudes due to the inconvenience of using supplemental oxygen.

The only reason to pressurize an aircraft is profit.

Pressurized aircraft are built because they can generate a profit for the manufacturer. Any aircraft can be made with pressurization but it comes with a price. If marketing determines it will sell, they will build it.

You can look at pressurization as simply a comfort option. A comfort option that comes with a price.

You can also have an aircraft built in both pressurized and un-pressurized versions.

The Cessna 402 and 414, Cessna 335 and 340, Piper PA-31 Navajo and PA-31P Pressurized Navajo are all examples of the same aircraft built in both pressurized and un-pressurized versions.

In all cases the un-pressurized aircraft can fly at about 26,000' but is generally operated at lower altitudes due to the inconvenience of using supplemental oxygen.

The only reason to pressurize an aircraft is profit.

Pressurized aircraft are built because they can generate a profit for the manufacturer. Any aircraft can be made with pressurization but it comes with a price. If marketing determines it will sell, they will build it with pressurization.

You can look at pressurization as simply a comfort option. A comfort option that comes with a price.

There have been many cases of aircraft being built in both pressurized and un-pressurized versions.

The Cessna 402 and 414, Cessna 335 and 340, Cessna 210 and P210, Piper PA-31 Navajo and PA-31P Pressurized Navajo are all examples of the same aircraft built in both pressurized and un-pressurized versions.

In all these examples the un-pressurized aircraft can fly well above 20,000' but is generally operated at lower altitudes due to the inconvenience of using supplemental oxygen.