What typically distinguishes proprietary specifications from others?

Proprietary specifications are characterized primarily by their inclusion of specific manufacturers or products that are approved for use in a project. This approach allows architects or designers to ensure that certain standards of quality, performance, or appearance are met by specifying particular brands or products. By limiting options to those manufacturers, proprietary specifications enable a clearer direction for contractors, limiting the variability that can arise from using multiple sources, and helping to simplify the evaluation and approval process.

The focus on specific manufacturers also ensures that the materials or systems used are thoroughly understood by the project team, which can enhance compatibility and overall project performance. This designates proprietary specifications as more prescriptive in nature compared to other types, which may allow for greater flexibility or alternatives.