ESTIMATION AND COSTING AND SPECIFICATION.pptx

ESTIMATION AND COSTING AND SPECIFICATION

1. ESTIMATION AND COSTING Name - Ar. Tanvi Mahesh Vesanekar .

2. • In Civil Engineering, word 'estimate' is related with various Civil Engineering structures like buildings, roads, dams, canals, railways, bridges, etc. • In this Chapter the definition of 'estimate' and its types are explained in detail. INTRODUCTION

3. MEANING OF ESTIMATING AND COSTING • It is the process of calculating probable quantities of various items and expected expenditure to be incurred for particular project of work.

4. PURPOSE OF ESTIIMATING AND COSTING 1. To know the approximate cost of proposed work. 2. To know the approximate quantity of various materials and lab required. 3. To obtain administrative approval and technical sanction of the 4. For inviting tenders and to arrange contract. 5. To have an idea about the time of completion of project. 6. To know the requirements of tools, plants & equipment’s. 7. To give an idea for keeping control over expenditure during construction. A . PURPOSE OF ESTIMATING

5. A . PURPOSE OF COSTING 1. To determine probable cost of work before execution. 2. It helps in financial planning to owner before going for construction. 3. Costing of various items required for construction of structures is known well in advance and accordingly arrangement of finance can be made. 4. Addition and alterations in planning and designing can be done if the costing goes beyond the capacity.

6. ADMINISTRATIVE APPROVAL :- For any work or project it is necessary to take formal acceptance with respect to cost, and work called as administrative approval For administrative approval, the department sends a proposal to government for taking up the work. After considering all aspect like feasibility of project, financial aspect, government accept proposal called as administrative approval. An approximate estimate and such preliminary plans are necessary to explain the proposals are submitted by an engineering department to the administration to obtain administrative approval to take up the work within the sanctioned amount

7. TECHNICAL SANCTION:- Technical sanction means the sanction of detailed estimate, detailed drawing, structural drawing of work. It is sanctioned by competent authority the work is taken for execution only after the technical sanction Revised technical sanction is necessary if the estimated cost exceeds or likely to the exceed by 5%of the technically sanctioned amount. Technical sanction once given remains valid for 5 years. The government gives power of sanction to various government officials as follows: 1. Chief engineer - full power. 2. Superintending engineer - up to Rs.1.00 Crore 3. Executive engineer- up to Rs.30.00 lakh

8. BUDGET PROVISION:- Budget means annual financial statement of an anticipated receipts of expenditure. After getting administrative approval and technical sanction a report mentioning -raw material, organization setup and total cost required for execution of project. Considering proposal budget provisions are made in five year plan and yearly budgetary provisions are made and sanction is given. Budget is prepared by finance department. It is necessary to arrange required finance for various activities to carry out progress of work in sequence and smoothly.

9. ROLES AND RESPONSIBILITIES OF ESTIMATOR:- To prepare list of items as per the drawings. To prepare centre line plan of the structure. To calculate quantities of items of work. To express all quantities in correct units of measurement. To prepare estimate as per drawing and specifications. To study rate analysis of items of work. To prepare measurement sheet and abstract sheet. To make provision of contingencies and work charged establishment in estimate. To make provision of funds for lifts ,air conditioning plant, electrification, plumbing in the total estimate. To prepare checklist of items with their specification

10. TYPES OF ESTIMATE:- There are two types of estimate:- 1.Approximate estimate 2.Detailed estimate

11. DEFINITION OF APPROXIMATE ESTIMATE An approximate estimate is an approximate or rough estimate prepared to obtain an approximate cost of a project in short time with out taking out actual quantities. For certain purposes, the use of such method is justified .

12. PURPOSE OF APPROXIMATE ESTIMATE:- The approximate estimate are prepared to serve the following purposes: To evaluate the cost of the project in short time. To evaluate the difference between several options. Check the final cost of the project is calculated by detailed estimation. For administrative approval. For valuation and rent fixation.

13. TYPES OF APPROXIMATE ESTIMATE :- 1 . Square meter method /plinth area method 2. Cubical content method 3. Service unit method 4. Typical bay method 5.Approximate quantities method

14. 1.PLINTH AREA METHOD :- This method is based on the plinth area of building. The plinth area should be calculated for the covered area by taking external dimension K the building at any flour level. Courtyard and other open area should not be included in the plinth area. Plinth area estimate is calculated by finding the plinth area of the1:52 / 4:34building and multiply by the plinth area rate. The rates are obtained from a similar building having similar specification , height , and construction in the locality.

15. 2 .CUBICAL CONTENT METHOD The volume of building can be obtained by multiplying the plinth area with the height of building. Length and breadth should be taken as the external dimension of building at the floor level and height should be taken from the floor level to top of roof. s In case of sloping roof, height is measured from floor to centre of slope portion. Foundation, plinth and parapet above the roof are not taken into account while calculating volume of a building In this method the volume or cubic content of the proposed building is worked out and multiplied by the rate per cubic volume of similar building in the locality. Approximate estimate= volume of building in cu.m . x Rate of construction per volume Example:- Approximate cost of a building of cubic content of 450cu.m and rate@ Rs.400/per cu.m . then Approximate estimate = 450 X 400 = Rs.1,80,000/-