Document estimate:
An accurate estimate in detail item-wise can be prepared by creating a document estimate. This involves compiling all the necessary information regarding the project, including materials needed, labor costs, equipment costs, and any other expenses that may be incurred. This document serves as a guide for all parties involved in the project, ensuring that everyone is on the same page regarding the estimated costs.

Quantity estimate:
Another important aspect of preparing an accurate estimate is to create a quantity estimate. This involves determining the quantity of materials needed for the project based on the specifications provided. By accurately calculating the quantity of each item required, the estimate can be more precise and reliable.

Quantitative estimate:
A quantitative estimate involves using quantitative methods to determine the costs associated with the project. This can include using mathematical formulas, statistical analysis, and other quantitative tools to arrive at a more accurate estimate. By relying on quantitative data, the estimate can be more objective and less prone to errors.

Detailed estimate:
Finally, a detailed estimate is essential for ensuring accuracy in estimating costs. This involves breaking down the estimate into individual components, such as materials, labor, overhead, and profit margin. By providing a detailed breakdown of all costs involved, stakeholders can have a clear understanding of how the final estimate was calculated. This level of detail also allows for better cost control and monitoring throughout the project.