As a freelance estimator, your responsibilities are to provide your client with a cost estimate for the materials, labor, and other aspects of projects like high rise construction, product manufacturing, or public works construction. You may be contracted to review a bid or to ensure that a contract covers all the potential costs of the project. Your duties are also to assess the project timeframe and provide advice on how to keep costs down while ensuring a project meets order goals, efficiency targets, and safety requirements.