Only when developers get the property right certificate, that is, the small property right certificate, can they handle the property right certificate of the buyers. Usually, when a property buyer handles a "small property right", the developer should fulfill the obligation of assistance and inform the property buyer what application materials need to be prepared. Property buyers can also check the materials needed to apply for house ownership in the local official website. According to Article 27 of the Measures for the Administration of Urban Housing Ownership Registration, the registration authority shall review the application of the obligee (applicant). If the ownership is clear and the source of property rights is complete, the initial registration, transfer registration, change registration and other rights registration shall be approved and registered within 30 days after accepting the registration, and a certificate of house ownership shall be issued; The cancellation of registration shall be approved within 15 days after the registration is accepted, and the house ownership certificate shall be cancelled. " Therefore, in the case of complete application materials, property buyers can generally apply for the house ownership certificate within 30 days, which is the "small property right" mentioned above.