Every major reconstruction project requires a form of legal paperwork to ensure regulations and policies are met, particularly in neighbourhoods with a Homeowners Association (HOA). It is important to check with the by-laws of the community before planning a gut renovation.
In addition to the HOA, the local town or city has guidelines and building codes to be followed by all construction projects, including DIY. A reputable renovation contractor will know how to apply for the proper demolition and construction permits.