Is it permissible to partner with a contractor in building a fence for a project that has not yet begun, with a 5% profit margin, given the contractor's urgent need for money to complete the project?

If the questioner enters as a partner with his money alongside a contractor who contributes his effort and work, and they both adhere to the regulations of partnership, then there is no objection. Among the regulations is that the share of each partner must be a common percentage of the profit, not the capital, and that a partner does not guarantee the capital of his partner except in cases of negligence or transgression. Also, the capital of the questioner must be distinguished from the capital of the contractor for the division of profits to be valid; otherwise, the transaction might be a loan with an increment, which is impermissible.