RESIDENTIAL RCC BUILDING COST BY THUMB RULE
Thumb rule to calculate the Steel quantity required for Slab, Beams, Footings & Columns:
For Residential buildings 4.5Kgs-4.75Kgs /SFT
For Commercial buildings 5.0Kgs-5.50Kgs/SFT
For more accurate results you can also use BN Datta recommendations:
As per B N Datta, the Steel quantity used in different members of the building can be calculated easily using the following recommendations.
Structural Member Percentage of Steel
Slab: 1% of the total volume of concrete
Beam: 2% of the total volume of concrete
Column: 2.5% of the total volume of concrete
Footings: 0.8% of the total volume of concrete
Example:
Thumb rule to calculate Steel quantity of above slab = Volume of Concrete x Density of Steel x % of Steel of Member
Steel quantity required for above slab = 3 x 7850 x 0.01 = 235Kgs
Thumb rule to calculate the Shuttering area:
Shuttering costs 15-18% of the total construction of the building.
Shuttering is framed to bring the concrete in Shape.
The Thumb rule to calculate the shuttering required is 6 times the quantity of concrete or 2.4 times of Plinth area.
Suppose, the concrete quantity is 0.5m3
then the shuttering area required is 0.5 x 6 = 3m2
Components of Shuttering:-
Shuttering Ply, Battens, Nails are components of Shuttering.
Shuttering Ply Quantity calculation:
The shuttering Ply has a length, width & depth of 2.44 x 1.22 x 0.012
The No. of Shuttering Ply sheets = 0.22 times of Shuttering
Suppose, the area of shuttering required = 3m
Then the Shuttering Ply required = 0.22 x 3 = 0.66m2
Battens Quantity Calculation:
Shuttering batten usually have a length & width of 75mm x 40mm.
Batten Quantity = 19.82 x No. of Ply Sheets
if the construction requires 25 Ply sheets,
the total quantity of Battens are 19.82 x 25 = 495 Battens
Nails & Binding Wire Quantity in Shuttering:
75gms of Nails are used for 1m2 of Shuttering
75gms of Binding wire is consumed for every 1m2 of Shuttering.
Thumb rule for Shuttering oil Quantity:
Shuttering oil is used to de-frame or de-assemble from the concrete easily.
Total required Shuttering oil is = 0.065 x Total Area of Shuttering
(or) For every 15Sqm of shuttering 1 liter of shuttering oil is consumed.
Example :
15m2 is total area of shuttering, then Shuttering oil required = 0.065 x 15 = 0.975 lts
For Accurate Shuttering Area Calculation, You can check here Shuttering area required for slabs, columns, Beams, Footings
Thumb rule for Cement, Sand, Coarse Aggregate Quantity in Different grades of Concrete :
Concrete Mix Cement Quantity Coarse Aggregate Quantity Fine Aggregate Quantity
M5 (1:5:10) 2.82 Bags 0.98m3 0.49m3
M7.5(1:4:8) 3.48 Bags 0.97m3 0.48m3
M10(1:3:6) 4.50 Bags 0.90m3 0.45m3
M15(1:2:4) 6.60 Bags 0.88m3 0.44m3
M20(1:1.5:3) 8.40 Bags 0.84m3 0.42m3
For Accurate calculation refer to Concrete Mix design for Different grades of concrete
Thumb rule for Cement quantity in Brickwork, Cement Masonry & Plastering work in construction:
Brickwork Thumb rule:
Brickwork for 1Cum Cement Qty in Cum Cement Qty in Bags
230 mm Brickwork 0.876m3 25.4 Bags
115 mm Brickwork 0.218m3 6.32 Bags
Cement Masonry Quantity Thumb Rule:
Cement Masonry Type & Mix Cement Qty in Bags Cement Qty in Kgs
200mm in Cement Masonry work of ratio 1:6 0.124Bags/m2 6.2Kgs/m2
150mm in Cement Masonry work of ratio 1:6 0.093Bags/m2 4.65Kgs/m2
200mm in Cement Masonry work of ratio 1:4 0.206Bags/m2 10.3Kgs/m2
150mm in Cement Masonry work of ratio 1:4 0.144Bags/m2 7.2Kgs/m2
100mm in Cement Masonry work of ratio 1:4 0.103Bags/m2 5.15Kgs/m2
Plastering Quantity Thumb Rule:
Type of Plastering Cement Qty in Bags Cement Qty in Kgs
Rough Plastering 0.09Bags/m2 4.5Kgs/m2
Internal Wall Plastering 0.09Bags/m2 4.5Kgs/m2
Duct Plastering 0.09Bags/m2 4.5Kgs/m2
External Wall plastering 0.175Bags/m2 8.75Kgs/m2
Stucco Plastering 0.175Bags/m2 8.75Kgs/m2
Lathen Plastering 0.55Bags/m2 27.5Kgs/m2
Construction cost estimation heads are:-
Services works – The service works cost varies between Rs 305 – 320 /- per Square feet and about 17 % of total construction cost.
This construction cost estimation head includes essential services like plumbing, electrical, HVAC, fire fighting, etc. The cost of CP, sanitary, and other fitting are also included under this head.
Finishing works – This includes all finishes work i.e flooring, painting, marble works, woodworks, MS railing, Gypsum plaster, etc. The cost varies between Rs 420 – 450 per Square foot and about 23 % of the total construction cost.
Civil works – This is the highest construction cost estimation head involved in this construction phase which includes excavation, footings, RCC work, Blockwork, plaster, etc. The cost varies between Rs. 980 – 1000 per Square feet and about 53% of the total project cost.
Consultant cost – In this the consultant cost varies between Rs 43 – 45 per Square foot and about 2.5 % of total construction cost. This includes the cost involved for architectural design, structural design, services design, etc.
Site establishment and temporary works – This construction cost estimation head includes the cost for barricades, clearing site, water and electrical charges for construction activities, site office construction, etc. The cost varies between Rs 85 – 90 per Square foot. and about 4.5 % of the total construction cost.
The below table gives a more detailed idea about construction cost estimates for each activity
Sr. No. Contract Code and Name Cost per Sq ft % of the total cost
(A) Consultants
1 Architectural designing 21.85 1.2
2 Structural designing 7.28 0.4
3 Services 13.11 0.7
7 Model making 1.098 0.1
9 Plot Survey 0.13 0.0
Total 43.83 2.4
(B) Civil Works
1 Excavation 15.96 0.9
2 Anti termite treatment 0.10 0.0
3 Substructure Waterproofing, 3.96 0.2
4 RCC works, Blockwork, Plaster,
Misc civil works 966.76 52.0
Total 986.80 53.1
(C) Finishing Works
1 Flooring 142.01 7.6
2 Kitchen Platform with Sink 21.41 1.2
3 Entrance lobby & signage 9.15 0.5
4 Woodworks 67.81 3.6
5 Waterproofing 12.74 0.7
6 Gypsum Plaster 36.52 2.0
7 P.O.P false ceiling 6.49 0.3
8 External Painting 20.82 1.1
9 Internal Painting 21.26 1.1
10 staircase painting 1.91 0.1
11 Lift Shaft Painting 0.34 0.0
12 Duct Painting 2.53 0.1
13 Ceiling paint 7.62 0.4
14 Aluminum Window 46.19 2.5
17 M.S Railing 11.16 0.6
18 Facade work 6.19 0.3
Total 419.69 22.6
(D) Services
1 Plumbing & pumping 51.57 2.8
2 CP Sanitary 44.45 2.4
3 Fire fighting 23.43 1.3
4 Electrical 76.44 4.1
5 Lifts 82.40 4.4
6 IBMS 16.33 0.9
7 Solar water system 4.39 0.2
8 DG Set 6.59 0.4
Total 305.63 16.4
Initial Total (A+B+C+D) 1755.96 94.4
Site Establishment 33.01 1.8
Electrical & water charges 1.5% 26.33 1.4
Contingencies for temporary works 17.55 0.9
EHS budget 8.77 0.5
Construction Cost / Sq ft 1859.22 100
This Estimate can be changed with respect to site specification, material quality, time, rate of labour, location of the site, etc.
Team
CBEC India
