This study was prepared to determine the difference between design and construction of Temporary Houses for post-disaster Semeru eruption in 2021. From the design documents and actual construction on the site, there are some changes, and the factors that influence these changes can be seen. The eruption of Semeru at the end of 2021 caused several areas in Lumajang Regency damage and the community had to be relocated to new places that were considered safer and feasible. The accelerated relocation program is accompanied by a Temporary Houses design concept provided by Indonesian Architect Association (IAI) East Java region. However, along the way, there are several adjustments to support postdisaster rehabilitation acceleration programs. The focus of temporary housing is fast, cheap, safe, and can be mass-produced. From this study, factors that influence the design adjustment are Site Condition, Number of Building Units, Material Availability, Human Resources, and Government Policies and Policies. Design adjustments have occurred very often, such as in the construction of common buildings, there are planning documents, known as detailed engineering drawings (DED), then there are adjustments to site conditions, becoming shop drawings (drawings that will be implemented) and finally, there are drawings according to the building being built, as-built drawing.