Does it make sense for me to install steel attic property?

There is no written agreement in the purchase contract that the oral promise of the salesperson is legally invalid, and it is legal to refuse to do the property. The attic is an illegal building.

According to the Urban and Rural Planning Law, all new construction, reconstruction and expansion projects in urban planning areas without the approval of urban construction planning departments are illegal buildings.

It is undoubtedly illegal to add a roof to the attic without approval.

Since it is an illegal building, the urban management will certainly take care of it.

Legal basis: Urban and Rural Planning Law Article 40 Where buildings, structures, roads, pipelines and other projects are built in urban and town planning areas, the construction unit or individual shall apply to the competent department of urban and rural planning of the people's government of the city or county or the people's government of the town determined by the people's government of the province, autonomous region or municipality directly under the Central Government for a construction project planning permit.