What is the ruling on building a hangar for a branch of a building materials company after agreeing with a municipality representative on a discount on materials in exchange for permission to build, knowing that I am the contractor who will build it, and I did not intervene in determining the discount, and the administration approved the price I submitted to them despite the presence of a cheaper contractor?

It is not permissible for the contractor to deal with the company as both a prime contractor and an agent for it simultaneously without informing the company and obtaining its consent, because this combines two contradictory objectives: seeking a lower price for the contractor and seeking a higher price for the principal. However, if the company grants permission, it becomes permissible, as the prohibition is removed. An agent does not have the right to purchase for himself except with the permission of his principal. As for dealing with the municipality representative by reducing the price in exchange for permission, this requires further detail.