Can private individuals set up advertising boards on the walls of their homes facing the street?

This is definitely not possible. Setting up these advertisements must be approved by the relevant departments (usually the city appearance and environmental sanitation department), otherwise you will be fined and punished. The legal basis is as follows:

"City Article 11 of the Regulations on the Management of City Appearance and Environmental Sanitation. Outdoor advertisements, placards, galleries, showcases, etc. set up in the city must be healthy in content and beautiful in appearance, and must be regularly maintained, decorated or dismantled.

The installation of large-scale outdoor advertisements must obtain the consent of the city appearance and environmental sanitation administrative department of the city people's government, and go through the approval procedures in accordance with relevant regulations.

Article 9 of the "Regulations on the Management of Urban City Appearance and Environmental Sanitation": Buildings and facilities in cities should comply with the urban appearance standards stipulated by the state. Cities open to the outside world, scenic tourist cities and other cities where conditions permit can formulate urban appearance standards that are stricter than those stipulated by the state based on local specific conditions; incorporated towns can refer to the urban appearance standards stipulated by the state.

Article 10 of the "Urban City Appearance and Environmental Sanitation Management Regulations" All units and individuals should keep buildings clean and beautiful. Objects that may hinder the appearance of the city may not be piled or hung on the balconies and windows of buildings facing the streets on streets specified by the city people's government. Building or closing balconies must comply with the relevant regulations of the city appearance and environmental sanitation administrative department of the city people's government.

"Urban City Appearance and Environmental Sanitation Management Regulations" Article 36 Anyone who commits any of the following acts shall be ordered by the city appearance and environmental sanitation administrative department of the urban people's government or its entrusted unit to cease illegal acts within a time limit. Cleaning, dismantling or taking other remedial measures, and may impose fines:

(1) Without the consent of the city appearance and environmental sanitation administrative department of the city people's government, setting up large-scale outdoor advertisements without authorization, affecting the city appearance;

(2) Without the approval of the city appearance and environmental sanitation administrative department of the city people's government, materials are piled on both sides of the streets and public places without authorization, and buildings, structures or other facilities are built, affecting the city appearance;

(3) Demolition of environmental sanitation facilities without approval or demolition in accordance with the approved demolition plan.