Mobile Toilet in Rental Housing
Whether installing a mobile toilet in a rental house is illegal depends on the specific circumstances, but unauthorized installation without the landlord's consent is generally illegal. Here is a detailed analysis:

Illegality of Unauthorized Installation Without Landlord's Consent
According to Article 715 of the Civil Code of the People's Republic of China, if a tenant needs to improve or add other items to the leased property, the landlord's consent must be obtained. If the tenant installs a mobile toilet without the landlord's permission, the landlord has the right to request restoration to the original state or compensation for losses. This provision clarifies the tenant's obligations in the lease relationship, namely not to alter the original structure or function of the house without authorization.
Potential Risks of Violating Building Safety Standards
Installing a mobile toilet may involve altering or adding to the structure of the house, such as adding bathroom functionality to a room without waterproofing design. According to Article 5 of the Measures for the Administration of Interior Decoration and Renovation of Residential Houses (Revised in 2011), it is prohibited to convert a room without waterproofing requirements into a bathroom. Such actions may damage the main structure or load-bearing structure of the house, posing safety hazards. If the installation of the mobile toilet is not approved by relevant departments or violates building safety standards, it constitutes an illegal act and the installer must bear corresponding legal responsibilities.
Administrative Penalty Basis for Illegal Rental Practices
Article 8 of the Measures for the Administration of Commercial Housing Leasing (2011 Edition) clearly stipulates that rental housing should be rented out with the originally designed rooms as the minimum rental units, and it is prohibited to rent out non-residential spaces such as kitchens, bathrooms, and balconies for people to live in. Although this clause does not directly mention mobile toilets, if the installation leads to a change in the function of the house (such as converting a living room into a bathroom), it may be deemed as illegal rental. According to Article 24, such actions may face administrative penalties such as being ordered to make corrections within a specified time limit and fines.
Impact on Neighborly Relations and Public Interests
If a mobile toilet is improperly installed, it may generate noise, odors, and other issues that affect the normal life of neighbors. According to the provisions on adjacent rights in the Civil Code, tenants must avoid damaging the legitimate rights and interests of others due to their own actions. If disputes or complaints arise due to the mobile toilet, the tenant may be required to bear civil compensation liabilities and may even face administrative penalties.
Exceptional Circumstances for Legal Installation
If the tenant obtains the landlord's consent and the installation of the mobile toilet complies with building safety standards (such as not altering the house structure and having waterproofing functionality), and does not affect neighborly relations, it may be deemed as a legal act. However, such circumstances must strictly meet the prerequisites and are relatively rare in practice.




