A construction administrative assistant provides clerical support to a project manager, contractor, or another construction professional. When it comes to your duties and responsibilities, you answer phones, schedule meetings, manage the office, help prepare the budget for projects, and ensure office supplies are in stock. You also have numerous business responsibilities. You prepare financial documentation, do essential bookkeeping, invoice contractors and suppliers, negotiate prices with vendors or service providers, and address any billing or ordering issues with vendors. If you are a senior administrator you may have managerial duties and must delegate tasks to other office workers.