ESTIMATIONEstimate is a calculation of various items of an engineering works so as to know its approximate cost and quantities of various kinds of materials required with labour involved for its satisfactory completion.

Enable owner / client knowledge of the cost involved in proposed work or projects.Enables him to arrange funds in addition to taking a basic managerial decision as to whether the work is to be undertaken at all or the proposed work needs to be modified.This is done from plans other drawings, specifications etc. on based this internal approvals mainly administration and financial are obtained.Estimate is the anticipated or probable cost of work an is usually prepared before the construction is taken.

Purpose of EstimatingTo ascertain the necessary amount of money required by the owner to complete the proposed work. For public construction works, estimates are required in order to obtain administrative approval, allotment of funds and technical sanction.To ascertain quantities of materials required in order to program their timely procurement. To calculate the number of different categories of workers that are to be employed to complete the work within the scheduled time of completion.

4) To assess the requirements of Tools, Plants and equipment required to complete the work according to the program.5) To fix up the completion period from the volume of works involve in the estimate.6) To draw up a construction schedule and program and also to arrange the funds required according to the programming.7) To justify the investment from benefit cost ratio. (For ideal investment, this ratio should be more than one ).8) To invite tenders and prepare bills for payment.9) An estimate for an existing property is required for valuation.

DATA FOR ESTIMATEDRAWINGS

SPECIFICATION

RATES

DRAWINGFully dimensioned and to the scale drawings are required for finding dimensions while doing measurements

Following drawings are required

PLAN AT A SCALE OF 1 CM = 1 METRE

ELEVATION AND SECTIONAL ELEVATION AT A SCALE OF 1 CM = 1 METRE

DETAILED DRAWINGS AT A SCALE OF 1 CM = 20 CM

SPECIFICATIONGENERAL SPECIFICATIONS

DETAILED SPECIFICATIONS

RATESRates per unit of various items of work include a. The rate of various materials which are used in construction b. Labour wages and categories c. Location of work its distance from source of material and cost of transport

Rates can be obtained from P.W.D. schedule of rate book or can be calculated by Analysis of Rates method.

IN PUTSPROCESSOUT PUTSDRAWINGSPECIFICATIONRATESCALCULATION OFLABOUR (SKILLED, UNSKILLED)MATERIAL (Course FINE)CARRAIGESREPORTSPRELIMINARY ESTIMATEDETAIL ESTIMATEORESTIMATE