Prefabricated structures services, including assembly and erection of modular frames and platforms, are treated as works contract or civil engineering services under GST. In the earlier years, different ways of bundling structure supply and installation sometimes led to different effective tax outcomes for similar jobs, which created uncertainty for contractors and clients.
After the September 2025 changes, most prefabricated structure assembly services under SAC 995442 generally come under the 18 percent slab with input tax credit. This standard rate applies where the contractor assembles and erects prefabricated structures on site, unless a specific notification grants concessional treatment for a particular public or strategic scheme.
The table below shows the latest standard GST rate for SAC code 995442.