The Single-Leaved Standard Dimension Paper / Quantity Takeoff Sheet for Building Estimating
The single-leaved standard dimension paper is an alternative that you can use in place of the double-leaved takeoff paper. Available at a few stores and suppliers of stationery, this paper is offered in A4 size, and you can choose between feint and no-feint ruled paper. Both types have vertical margins and headers. If you are not concerned about cost or saving space, this is the best type of paper that you can get for your construction work quantification. The advantage of this paper is that it offers you more space for laying out extra details on your work sheet. There is ample space for writing annotations and notes, as well as laying out waste calculations.
Annotations and notes are a good aid for readers who are attempting to follow the takeoff process and measurement method used by the Estimator. The single-leaved dimension paper has a column for annotations and waste calculations in addition to the normal timesing, dimension and squaring (summation) columns. The waste calculation and annotation columns are much wider than the previously mentioned columns.
When an Estimator is taking off quantities, he or she must keep in mind that the document (estimate) will be read by other parties for verification of the accuracy of quantities. It’s not only the Supervisor or Senior Estimator/Quantity Surveyor who needs to check your quantities, but the Contractor and Project Owner may also need to verify the document. Quantities that are larger than expected are a cause for concern for the owner, since the owner is the one responsible for budgeting and financing the project.
The supervising quantity surveyor needs to see that your quantities and cost estimates are within the anticipated cost range based on past projects and experience. During the planning and design stage, project specifications may change as required by the architect and owner. As designs are modified and drawings are altered, the quantities will also change accordingly. This preliminary stage is a stage for monitoring quantities and cost estimates before the final Bills of Quantities are sent out for tendering. The contractor comes into the picture during tendering stage. By signing the contract, the building contractor affirms that the Bills of Quantities are accurate, and that the company will complete the project at or below the contract sum in the BOQs.
The tendering stage is an opportunity for the contractor to check the Bills of Quantities for errors. Some of the common errors found during this procedure are arithmetic errors and discrepancies between the quantities and the scope of the project (drawings). If these errors are found, the contractor has to notify the quantity surveyor who will then issue an addendum for corrections before the tender adjudication.
Discrepancies in quantities may also arise during the contract stage when measurements and valuations are done on site. Quantities under dispute between the contractor and client’s project manager may be required to be re-measured to settle the dispute. If there were no alterations to the final tender drawings, the discrepancies in quantities might be due to inaccurate measurements by the Project Estimator responsible for producing Bills of Quantities.
In all this, errors and discrepancies can be quickly found if the dimension sheets are annotated and the takeoff is laid out clearly and logically. That’s one of the reasons why you should use a single-leaved standard dimension paper that offers more space for waste calculations and annotations.
Layout of the Single-Leaved Standard Dimension Sheet:
The single leaf paper has the following columns:
First column – Timesing column (for entering multiplication factors or constants)
Second column – Dimension column
Third column – Squaring column (also known as the summation column)
Fourth column – Description column (For item descriptions and waste calculations)
Fifth column – Annotations (explanatory notes).
The header includes fields for the Project Name, Name of Estimator, Date and Page Number.
Example of Quantities and Entries on a Single-Leaved Dimension Sheet:
More details about the Bill item being quantified (Cut and Fill Excavation) as well as the Cross-Section Drawing are found on this post >> Two-Leaved Standard Dimension Paper