Final answer:
The main purpose of a building permit is to ensure construction projects comply with local zoning regulations, which are designed to protect public welfare, guide city development, and regulate land uses in different districts.
Step-by-step explanation:
The purpose of requiring a building permit before construction begins is multifaceted, but the primary reason is to ensure compliance with zoning regulations. These zoning regulations divide cities into residential, commercial, and industrial districts with the intent of making property use within each district uniform. This organization helps maintain the character of each community, controls urban growth, and ensures that development adheres to a master plan that takes into consideration the future of the city including public facilities, street plans, and public welfare.
By managing how land is used, these regulations also address externalities, like ensuring environmental practices conform to city standards, and balancing the exchange and use value of land to protect various social and economic interests. Zoning ordinances are not solely for aesthetic harmony; they are designed to protect public health, safety, comfort, morals, and welfare and must be reasonable and non-arbitrary to be accepted. Furthermore, developments must provide for sufficient infrastructure such as off-street parking and must obey restrictions like lot frontage and the type of buildings permissible. For instance, certain areas might be restricted to single-family homes or to multi-family dwellings, depending on the zone.
Considering the impacts of land use, owning property or a business comes with the responsibility of adhering to these regulations, which can influence operational decisions, property values, and impact the broader community.