Study This aims to analyze the arrangement law increase in Building Use Rights become the Ownership of land in purchase House subsidies to Limited Liability Companies Rinjani Salwa Lowangi and To analyze the implementation increase in Building Use Rights become the Ownership of land in purchase House subsidies at PT. Rinjani Salwa Lowangi. The research method used is to study normative-empirical law, whereas the approach used is to approach legislation, conceptual, and case. Research results can be concluded that rules for others who become support giving and also improvement right in purchase House subsidy has poured out in regulation Decree of the Minister of State for Agrarian Affairs / Head of the National Land Agency No. 6 of 1998 concerning Granting of Ownership Rights land For House stay, Law Number 4 of 1992 concerning Housing and Settlement, Regulations Government Number 24 of 1997 concerning Registration Land and Regulations Government Number 18 of 2021 concerning Management Rights, Land Rights, Apartment Units, and Registration and Application improvement right from Building Use Rights to Ownership Rights at PT. Rinjani Salwa Lowangi walk with good. Against purchase House subsidies to PT. Rinjani Salwa Lowangi As a developer, the developer helps in the process of improving the right to purchase House subsidy with Notaries and Officials. Maker Land Deed designated by the developer alone For help the improvement the right process.