In general, building strength sheet is mandatory for buildings. For any reason such as changes in the building structure, unauthorized construction, etc., they cannot receive the completion of the work. And it should be noted that it is mandatory for the owners to obtain a certificate of building strength from the municipality. And it is not mandatory for engineers, and no law or power can oblige an engineer to approve a building that was not in the course of its construction operations.

The building strength sheet must be issued and signed by a civil engineer with an engineering system employment license and design and supervision qualifications.

Many old buildings that have not been completed, or buildings that were not built under the supervision of a supervising engineer, or buildings that are being added to, or have an addition, or units that are changing use, for example, a residential unit becomes a commercial administrative unit of the municipality. From these buildings, it takes time to buy and sell, transfer documents, demolish or renovate, and many other things require a certificate of completion.