Legal analysis: 1. Building a roof in your backyard, if it is a sunshade or canopy, is not an illegal building, and it does not need to apply to the urban and rural planning department for construction, which is protected by law.

Legal basis: Article 37 of the Urban and Rural Planning Law of People's Republic of China (PRC). After the construction project providing the right to use state-owned land in urban and town planning areas is approved, approved and put on record by the relevant departments, the construction unit shall apply to the urban and rural planning department of the people's government of the city or county for planning permission for construction land, which shall verify the location, area and permitted construction scope of the construction land and issue it.