There are endless thumb rule used in Construction Industry , I am stating few of them listed below : -
Concrete : 0.038 cum per sq. ft. of plan area.
(+/- 5%)
Steel : 4.50 to 5.00 Kg per sq. ft.
Shuttering : 2.40 to 2.50 times the plan area of slab (this includes col./beams/sides etc)
Brick Work : 0.015 cum per sq. ft. of plan area.
Approximately 0.25 cubic metres of mortar and 500 bricks are required for 1 cubic metre of brickwork
Concrete: 0.5A Cum for Commercial Bldg.
0.2A Cum for Residential Bldg.
Where, A= Total Built Up Area.(i.e. Plinth Area xNo. of Floor)
Steel: 4.5-4.75 kg per Sqft of Built up Area for Residential Building
5.0-5.5 kg per Sqft of Built up area for Commercial Building.
Formwork:
(1). Shuttering = 6 times the quantity of concreting.(or2.4 times the plinth area)
(a) No of12 mm Ply (2.44mx1.22m)=0.22 times of shuttering ( or, 0.4A)
(b)Batten(75mmx40mm)=19.82X No. of Ply Sheets(it gives batten in RM)
(c)Nails=0.22x total area of shuttering.(unit-kg) Practically, 75 gm nails and 75 gm binding wire + nut-bolts are consumed per sqm of shuttering
(d)Shuttering Oil=0.065x total area of shuttering(unit-Lt)
Electrical cost = Rs 133/sft
Plumbing cost = Rs 126/sft
Fire fighting cost = Rs 40/sft
External development = Rs 94.5/sft
Labour Productivity:
Brick Work - 1 mason + 1Labour = 1.25 cm
Wall Plastering - 1 mason +1 Labour = 10 Sqm
Ceiling Plastering - 1 mason + 1Labour = 8 Sqm
External Plastering - 1 mason + 1 Labour = 8 Sqm
Carpenter - 1 Skilled + 1 Un skilled = 4 Sqm
Bar bender - 1 Skilled + 1 Un skilled = 200 Kg
Tile work - 1 Mason + 1Labour = 10 Sqm
Painter - Skilled -OBD 600 Sft
- Emulsion 800 Sft
CO-EFFICIENT FOR PAINTING:
Partly paneled and glazed doors = 0.80 times the door or window area.
Collapsible gates = 1.50
Corrugated sheeted steel doors = 1.25
Rolling shutters = 1.10
Expanded metal hard drawn steel = 1.00
Fencing and gates, brace, rails = 1.00
Flush doors = 1.20
Partly paneled doors = 1.00
Fully glazed doors = 0.80
Fully louvered = 1.80
I f its only for slab ….then a 5″ slab almost costs roughly Rs.220/- per sq. Feet all inclusive of Steel, Rcc, Shuttering etc.
If u are asking for residential building complete in all respects…than it costs u around Rs. 1200/- per sq. Feet. Civil Structure Work – Rs. 750 per sqft and for Finishing Work – Rs. 450 per sqft.
(a) Painting - Rs 12 - 17 per sqft (two layers of putty + two layers of coat) including taxes
(b) Flooring - Marble is Rs 80 per sqft (depends on the type of marble may be - but this is what it is costing us). Granite and bathroom tiles 15 - 20 Rs per sqft (we provide all material such as cement, sand etc).
(c) Electrical - You are better off buying the materials for them. A rough guide is Rs 50 - 100 per sqft for materials and Rs 12 - 20 per sqft for labor.
Also Read: What is cement and its type?
CEMENT REQUIREMENTS:
M10 : 210 Kg
M20 : 320 Kg
M25 : 340 Kg
M30 : 380 Kg
M35 : 410 Kg
M40 : 430 Kg
M45 : 450 Kg
I hope these thumb rule will help you in your career
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