Types of Estimates in Building Construction

Estimation determines the probable construction cost of a project. Estimating can be done at various stages of project duration depending on the purpose of estimation. First estimation is done before construction starts for the purpose of making budget of the project or bidding the project as a contractor. There are various types of estimation can be done depending on project manual and drawing provided and the purpose of using estimated data.
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Types of Estimates in Building Construction


Followings are common types of estimate -

* Detail Estimate
* Unit Based Estimate
* Model Estimate
* Comparison Estimate
* Parametric Estimate

Detail Estimate - This type of estimate includes everything that needs to complete the project as well as overhead and contractor's profit. For this type of estimate, an estimator needs complete set of drawing and instruction manual of the project. This estimate shows required materials, labor, time to complete the project, complete cost details and overhead and also contractor profit. It also includes insurance, bond, equipment and other necessary things that need to complete the project. Estimator for this type of estimating should be experienced person because complete project budget, time duration and contractor profit depends on his visualization.

Unit Based Estimate - This type of estimate is prepared by calculating building area and then multiplying area by predefined unit cost. And then adjusted the cost by considering building height, length, width and other necessary building components. Required documents for preparing this type of estimate is a simple floor plan with measurement and key elevation of the building. This type of estimation is used to check whether the project was designed within owner's budget.

Model Estimate - This type of estimate is prepared based on a model project estimate which is developed before. Preparing this type of estimate needs answering several key questions depending on model project. Such as length and width of building, number of base, size of base, floor height, number of bath etc. Keep in mind that proposed project should be similar to model project. this type of estimate may prepare a details estimate of whole project or a part of project depending on the model project.

Project Comparison Estimate - In this method, an estimator prepares estimate of proposed project by comparing similar completed project. After preparing the comparison estimate, estimator makes adjustment for variation of proposed project with the completed project.

Parametric Estimate - In this type of estimate, an estimator uses equations to prepare the estimate. This equation is the relationship between "parameters" and "cost" of a building project. This estimate is like unit based estimate but more complex than unit based estimate. This type of estimate is done for getting concept of proposed project cost.

There are some other methods are used to determine the project cost in the different location of the world. Nowadays, there are many computer programs available in the market to make the estimation process easy and quick.


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20 comments :

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  2. Some greate knowledge u had been given thanks

    ReplyDelete
  3. Very nice and very good information given.Actually I am searching for the difference bet PRIMAVERA and M.S.Proj.
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    THANK YOU VERY MUCH.

    ReplyDelete
  4. thankssssssssssssssssssssss,sir

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  5. thanks for providing good information's

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  6. Normally there are three types of estimates, categorised by ACES
    Factored estimates
    Parametric estimates
    Detailed estimates
    these types you have mentioned mixed a couple of them together.
    but still a simple briefing of what estimates are

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  7. can you show a practical work on detailed estimation ??

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  8. Everything is fine how about usage of steel materials. Can you give the steel estimation???

    Steel Fabrication Dubai

    ReplyDelete
  9. Very Nice Compilation on Estimation...one can realize more informative post after seing it.

    ReplyDelete
  10. So useful the way you show the information and the the backage of the information you give to all.thanks alot

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  11. Types of estimate
    1.detailed
    a.indiviual method
    b.center line method
    2.abstract
    3.supplementary
    4.revised
    5.project abstract
    6.construction
    7.completion

    ReplyDelete
  12. Types of estimate
    1.detailed
    a.indiviual method
    b.center line method
    2.abstract
    3.supplementary
    4.revised
    5.project abstract
    6.construction
    7.completion

    ReplyDelete
  13. Thank you for the research and energy you spent for this brief.
    Asker Berg

    ReplyDelete

 

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