Construction Cost Estimates and Home Inspection Service
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Basic Introduction to B.O.Q (Bill of Quantities )
- Quantity surveying emerged as a separate profession in Britain in the 19th century. It is simply a task of measuring construction work required to implement the architects’ design for new or renovated buildings. The purpose of the work is to produce quantified specifications of works known as Bills of Quantities.
- The objectives of the Bill of Quantities are: (1) to provide sufficient information on the quantities of Works to be performed to enable bids to be prepared efficiently and accurately; and when a contract has been entered into, (2) to provide a priced Bill of Quantities for use in the periodic valuation of works executed.
- In order to attain these objectives, works are itemized in the Bill of Quantities in sufficient detail to distinguish between the
different classes of works, or between works of the same nature carried out in different locations or in other circumstances which may
give rise to different considerations of cost. Consistent with these requirements, the layout and content of the Bill of Quantities are required to be
as simple and brief as possible.
- The large data bank of information contained in the Bill of Quantities can be used in many ways to help the post-contract control of a project by practice Cost of Estimating on preconstruction.
- SOME OTHER ADVANTAGES OF THE USE OF BILL OF QUANTITIES
- Save the cost and time of several contractors measuring the same design in order to calculate their bids for competition.
- Provide a consistent basis for competitive bids so that the contractor who is the most efficient and least expensive in providing the items of work is likely to be commissioned for the job.
- Provide an open basis for the contract; the client provides an extensive and clear statement of the work he/she requires and the contractor states the price at which he/she is prepared to undertake the job.
- Provide a very strong basis for financial administration of the contract.
POST-CONTRACT USE OF BILL OF QUANTITIES
The Bills of Quantities and Cost Estimating are usually indicated by items of work, units of measurement, quantities of work, rate for doing the work, and total value of the work.
- Usually the contractor goes through the Bills of Quantities and would quote her/his rate as a percentage above or below the rates indicated.
- Even though the QS employed by the owner provides a detailed estimate for the project, sometimes the rates and total amount to do the works may not be shown in the Bills of Quantities. In that case, the bidder provides the rates of the items at which she/he is capable to do the works.
- Pricing of different items of work and Cost Estimating are done on the basis of the cost of materials, equipment, labor, and overheads and profit.
- Materials: The materials costs are calculated by examining the material quotations received from suppliers, applying appropriate wastage factors, and delivery charges.
- Equipment: Cost of equipment is calculated usually as a percentage of the cost of materials. Depending on whether the equipment is owned or rented, this percentage will vary.
- Labor: The most difficult element to price is the labor cost. Most of the times, it is not sufficient to rely on published standard rates. Allowances for absences due to sickness, loss of time due to inclement weather, overtime, etc. are required to be built in to arrive at a pragmatic all-inclusive labor rate. Rate of productivity is another factor that plays an important role in fixing labor prices.
- Overheads and profit: Once the cost of materials, equipment, and labor has been added up, a percentage for overhead and profit is added to the item rate. This percentage may vary from project to project depending on how well the document has been prepared by the QS and also on market conditions. It may range from 2.5 to over 25 percent.
- Once the pricing of all individual items for all trades is completed, the amounts are carried to a summary page to indicate the total bid price and Cost Estimating.
Company work process steps.
1.Once received building plan from the client from e-mail or postal.
2.Contact client by phone and discuss building plan details.
3.Send in cost quotation and time flame of work detail to client. ( price and time flame are depending up on the plan details )
4.If all agree and deposit has been place by the client, we start the work process at once the date received.