Quantity survey

1. Important Points to Remember for Quantity Estimation.
Civil Works:
 To carefully note the various levels while calculating excavation & backfilling.
 To make note of the various levels of the structure & compare the measured
heights/length of various items with the levels.
 To check all the sections & elevations carefully prior to any estimation.
 To look into the NOTES given at the right side of the drawing in the info column.
 To look out for trenches, drops, slab elevations, projections & many others.
 To check for different slab depths over the plan.
 To carefully look into the openings, their types & numbers.
 To measure the height of the pedestal & columns up to the top level of above Ground
(plinth) & Roof beams respectively.
 To measure the length of the beam from column face to face.
 To carefully note the various given dimensions of the different structures.
 To carefully carry out the estimation of staircase, trenches etc. separately.
 To carefully note the beam positions & their depths while calculating Block/Brickwork.
 To consider the height of the wall for internal plastering works up to the slab bottom &
thereby considering deductions for openings.
 To carefully note the beams bottom surface (where there is no block work) for roof
bottom plastering.
Steel Reinforcement:
 To carefully name & number every individual rods before any calculations & workout
the no. of rods, length & span accordingly & individually.
 To learn the extra length formulae for the 45 & 30 deg cranks.
 To learn the calculations of the length & no. of rods for the top reinforcement in slab.
 To carefully note the data while calculating the length of rods, their numbers, their
span of distribution etc.
 To carefully keep note of the covers for various items of the structure.
 To carefully note the bends, elevations, cranks, while calculating length of rods.
 To carefully calculate the stirrups, their shapes, bends & the no. of stirrups for columns
& beams – Please learn about no. of branches of stirrups.
 To learn the measurement of lengths of 45, 90 deg bends, small cranks, hooks etc.

2. Unit Weight of steel (Kg/m)
 Unit Weight of steel (Kg/m) = Area (mm2) X Density (Kg/m3)
= (Pi * d2) / 4 X 7850.
= 3.141*d2 / 4 X 7850.
Since d is in mm, convert it into meters by diving it by (1000)
= 3.141*d2*7850/ (4*(1000)2)
= (3.141*7850*d2) / (4000000)
= 0.00616 * (d2)
= d2 / 162.
 1 cum = 30.31 cft.
 1 sqm = 10.76 sft.
 1 m = 3.28 ft.
 1 feet = 0.305 m.
 1 inch = 25.4 mm.
 1 cum of cement = 1440 kgs.
 1 bag of cement (50kg) = 0.034 cum.
 1 sqm of block work = 13 blocks (for 6” & 8”),
15 blocks (for 4” block)
 1 cum of brick work = 473 bricks
 1 sqm of brick work = 44 bricks
 M5 = 1:5:4
 M7.5 = 1:4:8
 M10 = 1:3:6
 M15 = 1:2:4
 M20 = 1:1.5:3
 M25 = 1:1:2

3. Steps in Quantity Estimation
1. Excavation - Individual footings / Entire Area with extra working space.
2. Backfilling - By Parts / Total excavation minus concrete qty below GL.
3. Column Necks/Pedestals - up to Grade Beam top level.
4. Plinth/Grade Beam - PCC & Concrete (Column face to face).
5. Columns - Grade Beam top to Roof Beam bottom.
6. Grade Slab - PCC, moisture insulation polyethylene & concrete.
7. Water Insulation/Bitumen for the substructure
 Footing bottom, side & top
 Column neck sides
 Concrete Walls
 Grade beams below GL
 Grade Slab Bottom
8. Roof Beam concrete
9. Roof Slab Concrete
10. Parappet Wall - RCC / Block work
11. Lintel Concrete
12. Block work
13. Plastering - Ceiling, Wall - ext & int, jambs.
14. Painting
15. Flooring - cement, tiles, marble etc.
16. Schedule of openings
17. Floor Finishes
 Roof Concrete slopes
 Heat insulation layers
 Screed concrete
 Mortar floor