Which of the following is not a common type of construction contract?

A per-diem contract is not a common type of construction contract. In the construction industry, contracts are typically structured around the specific relationships and agreements between the parties regarding cost and payment.

Lump-sum contracts, unit-price contracts, and cost-plus contracts are widely used and recognized in construction practices. A lump-sum contract involves a fixed price for a defined scope of work, which provides cost certainty for the owner. Unit-price contracts set prices per unit of work completed, allowing flexibility based on quantities needed, which is helpful for projects where the scope is not entirely clear. Cost-plus contracts involve the contractor being reimbursed for actual costs plus a fee, which can incentivize quality and thoroughness in construction.

However, a per-diem contract implies payment based on a daily rate, typically more associated with travel or administrative work rather than construction itself, making it less relevant in this context. This is why recognizing the common types of construction contracts is essential for understanding how projects are managed and priced within the construction industry.