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Estimate in interior designing for beginner


Estimate in interior designing

Definition: Assessment is a tool for planning and controlling the construction activity of any project in relation to the quality, time and finances.

Assessment: Construction quality and quantity include two things, these two things control the estimate of work. You can make an estimate by calculating the quantity of material required and quality.

Quantities can be found through the study and analysis of the drawing that has been drawn in relation to the design of the project. Thus the quantity determines the amount of work involved in the construction and it helps to find out the number of different materials required as well as the total labor required for the work.

Quality operates through specifications for materials and workmanship.

An estimate is a forecast of the potential cost of any project. Before starting any work or project it is necessary to know the potential cost of the project which was found by the estimate. The primary objective of the assessment is to be able to know the cost of the work before the work begins. The actual cost is revealed only after the work is completed.

If an estimate is carefully and correctly prepared by an individual (estimator) who is experienced and fully knows the method of work, there will not be much difference between the estimated cost of the project and the actual cost.

The estimate is prepared by calculating the quantity required to obtain the estimated cost of the project and then calculating the cost at appropriate rates. Provision ranging from 3% to 5% of contingency expenditure has been made in the estimate to cover miscellaneous expenditure which does not come under the head of any work. It also added the charged establishment of the work at 1.55 to 2% of the estimated cost. It is necessary to provide the cost of preliminary works and surveys, the cost of land including the cost of acquisition, the cost of ground level and dressing and the cost of other external services in addition to the estimated cost of various items. main work. Provision for the supervision of departmental fees of 5 to 10% of the estimated cost has also been made to get the estimated cost of the entire project.
The process of preparing an estimate is called an estimate and consists of two steps.

  • Quantification
  • Summary

Quantification: The details of the measurements of each an object of the work are correctly taken and a plan is made and the shapes and quantities under each object are calculated in a tabular form, named as the measure:

  • Item No.
  • Description or Description
  • No.
  • Length
  • The width
  • Height or depth
  • Material or quantity


Summary of Estimated Cost: The cost of each item of work is calculated in a tabular form from the previously calculated quantities and worked out as a summary of the total cost estimate as shown below.

  • Item No.
  • Description or Description
  • The quantity
  • Unit
  • rate
  • Amount

Type of assessment:



  1. Preliminary estimate
  2. Plinth area estimate
  3. Cube rate estimate
  4. Approximate quantity method estimate
  5. Detailed estimate
  6. Revised estimate
  7. Complement estimate
  8. Annual repair or maintenance estimate

1. Preliminary estimate:


It is also called a rough estimate or abstract estimate or rough cost estimation. Before starting work, it is necessary to study various aspects of the work to determine the financial situation. In a project that gives revenue income, the income will be calculated and a preliminary estimate is formed, comparing this calculation to see if the investment on the work is reasonable.

2. Plinth Area Estimate:


This is a rough estimate. It is drawn on the basis of the plinth area of ​​the building, the rate being deducted from the cost of renovation of buildings with similar characteristics. The plinth area estimate is calculated by finding the plinth area of ​​the building and multiplying it by the plinth area rate. Taking the outer dimensions of the building at the ground level, the plinth area should be calculated for the covered area. Courtyards and open spaces should not be included.

3. Cube Rate Estimate:


The cube rate estimate is a rough estimate. It is prepared on the basis of the cubic content of the building. It is calculated by multiplying cubic material x width x-height by length and cubic rate. This is similar to the plinth area but is more accurate than the plinth area estimate because the elevation is also calculated.

4. Estimating Estimated Quantity Method:


In this method, the approximate total length of the walls is calculated in running meters and its total length is multiplied by the rate per running meter. The cost of the running meter for the structure and interior must be calculated first and the rates of these running meters must be multiplied by the total length of the walls.

5. Detailed estimate:


Estimates of detail include the cost of working and the quantities of each item of work. The length, width, and height are correctly extracted and the quantity of each item is correctly extracted from the drawing and the quantity of each item is calculated and billed.

  • Item No.
  • description
  • No.
  • Length
  • The width
  • The height
  • The quantity


Through this chart, the quantity of each item is shown that each item needs to be properly expanded.

  • Item No.
  • description
  • The quantity
  • Unit
  • rate
  • Amount


After finding the appropriate amount there, the units put the value in this chart, you can find the amount by applying the appropriate rate for the particular item. A final estimate will be added by adding your fee and other charges as per the work requirement.

6. Revised Estimate:


This is an accurate estimate and is prepared when the original accepted estimate is more than 5%. Or the amount of administrative approval spent on the work exceeds 10%. Or a physical deviation from the original proposal enclosed by a statement indicating the variance of each item.

7. Supplemental Estimate:


This is an accurate estimate and is prepared when additional work is required. This is a freshly detailed estimate of the additional work that can happen during the work in progress or further work after completing your previous work.

8. Annual repair or maintenance estimates:

This is an accurate estimate and is designed to maintain the structure in proper order and in a safe condition. This includes whitewashing, color washing, painting, minor repair, and more.

9. Supplementary and revised estimates:

When work is partially abandoned and the estimated cost of the remaining work is less than 95% of the original work, it is less than 95% of the original accepted estimate, or when material deviations and design changes occur, which may be a substantial saving in the estimate, then The amount of the original estimate is revised by the competent officer. A supplementary and revised estimate is then prepared and fresh technical approval of the competent authority is obtained.
If at any time before or during the execution of the original work, it is found that the original estimate is excessive, and then the Divisional Officer may revise the revised other higher officers are informed.

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