24 C.F.R. § 232.605
Contract requirements
The contract between the mortgagor and the general contractor may be in the form of a lump sum contract, a cost plus contract, or different or alternative forms of contract specified by the Commissioner.
The contract between the mortgagor and the general contractor may be in the form of a lump sum contract, a cost plus contract, or different or alternative forms of contract specified by the Commissioner.