6 Types Of Estimates Every Contractor Should Know

Before knowing the types of estimates, you must understand what a construction estimate is. Construction estimates are used for estimating the costs of a construction project so that contractors can execute the projects with intelligent planning of every activity. With the help of construction estimates, contractors can make a plan for every activity and predict the overall cost of the project by accurately preparing the cost estimates of everything involved.

One more thing which helps the contractors is that estimates help them predict their profit margins even before the start of the project so that they can decide whether or not they should opt for the project.

Types of Construction Estimates

Different construction estimates are prepared at different levels of the construction process. For example, suppose you have to work on a project, and there is not much information and specifications available for that project, then at this moment. In that case, a “preliminary estimate” is prepared at the beginning of the project.

However, the accuracy of these estimates is not that high as these are prepared with minimal information, whereas on the other hand, if you have a complete set of conditions and specifications of the project, then a “detailed estimate” is prepared, the accuracy of these types of estimates are very high as these contains all the necessary documents and conditions.

1. Preliminary or Rough Estimate

A preliminary estimate is the approximate cost of the project that is calculated at the conceptual stage of the project. It forecasts the total budgeted cost of the specific construction project. Apart from new construction, It can also be prepared for demolition or renovation works.

The preliminary cost estimate of buildings is based on areas and length measurements of various structural elements. Moreover, the total square footage of the plot is also considered to get the approximate cost of building the house, plaza, or multi-story building.

Most of the clients require a preliminary budget estimate from contractors, and It helps to get a rough idea about the total expenses for the completion of the project. Depending upon the type of infrastructure, the estimation technique and units may change.

2. Quantity Estimate

A quantity estimate includes a list of quantities for all materials needed to complete a project. Its purpose is to give the client a complete list of all the quantities required for the project and the cost for each quantity. It is a required estimating method in construction. This is a complete estimate or list of quantities for all work items required to complete the project. The quantity of each work item is worked out from the respective dimensions on the structure drawing.

3. Revised Estimate

A revised estimate is a detailed estimate of the revised quantities and rates of items of work initially provided in the estimate. When the sanctioned amount exceeds more than 5%, either due to rates being found insufficient or due to some other reasons, a revised estimate is prepared.

A comparative statement is attached on the last page. It includes reasons for an increase in cost in the case of each item. Revised estimates should show the variation of each item of work, its quantity rate, and cost under original and revised.

4. Supplementary Estimate

While work is in progress, some additional work may become necessary for the project’s development, which was not included when the original estimate was prepared. For this reason, a freshly detailed estimate, in addition to the original sanctioned estimate, was prepared to describe the additional work, which we called the supplementary estimate.

During the progress of the work, some modifications or additions due to material deviation of a structural nature from the design initially approved may be necessary for the development of a project. A supplementary estimate includes all such works.

5. Annual Maintenance or Repair Estimate

Repairing is done for structures to keep them in perfect condition. After completing a work, it is necessary to keep the maintenance aspect in view for its proper functioning, for example, in the case of building whitewashing, oiling, painting, cement plaster repairs, and repairing floors, etc.

For these types of repairing, annual repair estimates are prepared for the items which require renewal, replacement, repairs, etc., for maintenance purposes. In no case, the annual repair amounts should be increased to greater than 45% of the capital cost of the building.

6. Detailed Estimate

These estimates are prepared when all the specifications and conditions of the projects are available. In the case of government tenders that the PWD releases, CPWD, Irrigation, or any other department, they release an NIT(Notice inviting tenders).

In these NITs, all the specifications of projects are mentioned, which can be used for preparing detailed estimates. The accuracy of detailed estimates is very high compared to the preliminary estimate because these are prepared with complete information about the projects.

Conclusion

Construction cost estimates are among the most critical components of your business’s profitability and winning new tenders. It’s essential to be as accurate as possible. This is why you must complete construction estimating to ensure you get everything. A contractor or any construction worker should always be very aware of the importance of construction estimates in the construction process to provide a successful bid.

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