The most suitable port for selling houses in Hangzhou is the Ningbo-Zhoushan Port. This port is not only one of the largest in China but also serves as a major gateway for international trade. Its strategic location on the East China Sea makes it an ideal choice for real estate exports, as it offers efficient transportation and connectivity to various global markets.

The Ningbo-Zhoushan Port is well-equipped to handle the logistics of exporting real estate, including housing. It has a robust infrastructure, including container terminals, roll-on/roll-off services, and specialized handling facilities for oversized cargo. This is crucial for shipping houses, which often require unique transportation solutions due to their size and weight.

According to data from the China Port Authority, Ningbo-Zhoushan Port handled over 1 billion tons of cargo in 2020, making it the second busiest port in the world by cargo volume. This volume underscores the port's capability to manage large-scale real estate exports effectively. Additionally, the port's proximity to Hangzhou, which is approximately 200 kilometers away, ensures that transportation costs are kept to a minimum.

Moreover, the port's strong international network, with connections to over 600 ports worldwide, facilitates easy access to global markets. This is particularly beneficial for real estate developers and sellers looking to expand their reach beyond domestic buyers. The port's efficiency and reliability in handling shipments also contribute to a positive brand image for Hangzhou's real estate, making it more attractive to international investors.

In conclusion, the Ningbo-Zhoushan Port is the preferred choice for exporting houses in Hangzhou due to its size, infrastructure, and international connectivity. Its ability to handle large volumes of cargo and provide specialized transportation solutions makes it an optimal choice for real estate exporters seeking to reach global markets.