<![CDATA[Rumah Sandi Dukuh is a Javanese limasan house in Kulon Progo, Yogyakarta, that served as an emergency post of the Dinas Code, Indonesia's wartime cryptography service, during the Second Dutch Military Aggression, and is now managed by Museum Sandi as an object presumed to be cultural heritage. Its revitalization programme had not been preceded by a systematic architectural study, leaving the building's historical form undocumented ahead of physical intervention. This study documents the identity, dimensions, and architectural style of Rumah Sandi Dukuh and produces a three-dimensional model as a technical reference for its revitalization. A qualitative case study carried out between September and December 2024 combined field observation and architectural measurement at the site, in-depth interviews with the museum officer responsible for the site and with a son of the original owner, and a literature study on heritage revitalization and Javanese vernacular architecture. Building-identity data were compiled on a Cultural Heritage Building Identity Sheet, and findings were triangulated across measurement and testimony before being modeled digitally. Rumah Sandi Dukuh, built before 1948, is found to be a limasan apitan pengapit, formed from two limasan lawakan units joined at the emper with a talang air, with a building area of 117 m² on a plot of 1,190 m². The resulting model, covering the building's ground floor, has been used by the Badan Siber dan Sandi Negara since November 2024 to guide the site's revitalization. The case shows how a small heritage institution can operationalize the documentation-before-designation principle of international conservation doctrine largely through manual methods.]]>
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