Construction Quantities and Costs
Construction Quantities and Costs
Construction Quantities and Costs
CONSTRUCTION MATERIAL
BASICS
STRUCTURAL ENGINEERING
Costing & Estimation HOW TO CALCULATE CONSTRUCTION COST PER SQUARE FEET OF A HOUSE
It is very essential to calculate the construction cost of a house for making budget or arrange finance,
as construction cost is increasing day by day.
I have made a complete series regarding learning how to calculate the construction cost of a house
per square feet. Also, in last I will upload a excel sheet of construction estimate, you have to just
update the new rates and measurements and you will get the cost of your house.
Today, we will discuss about the total construction cost of a g+1 floor house.
We divide into four parts for calculating the construction cost of a house.
There are several parts of a building house, 1- RCC stage, 2- Finishing Stage, 3-Decor stage,4-
Handover stage.
1- RCC stage
contains Excavation, Back filling, Concreting (beam-columns, slab, lintel, chajjas, footing, coping,
etc.), shattering, BBS, Curing, etc.
2- finishing stage
contains masonry, plaster, color work, electrical wiring, plumbing, fabrication, glass work, door-
window fittings, flooring, false ceiling, kitchen point, dedo tiles, etc.
3- Décor stage
means the testing of a house for living, it include some of minor works or some remaining revision
works to be done.
In this article, we will discuss about the construction cost of RCC part of the house.
Before calculations we need all the relative drawings and information regarding the house.
; 10 mm internal walls
You can see 3D design of the house, which we will calculate the construction cost.
Architectural plan
Two master bedroom, kitchen and living room with common bathroom are provided in this plan.
Beam-columns layout plan
Here you can see beam column layout plan with the dimensions.
Section-plan
You can see a vertical dimensions of each level. Also, every columns contains the footing.
2 B2 Varies 9 15
3 B3 Varies 9 12
4 C1 Varies 9 18
5 C2 Varies 9 15
13 W1 4’ - 5’ height
14 W2 4’ - 4’ height
15 V 2’ - 2’ height
We will start numbering from bottom left to right and left bottom to top for beam and column you
can see that numbering in beam column layout plan.
Before calculating the construction cost of a house we need quantities of various structural members
like beam, columns, slabs, footing, lintels, coping, PCC, etc.
Column quantity
First we will calculate rectangular column of 9x18 inch. Formula for calculating volume of rectangle is
L x B x H.
We have 18.5 feet height and width of 9 inch means 9/12= 0.75 feet breadth of 18/12 = 1.5 feet.
After calculating all the columns we are getting 239.3 cum. ft. volume of the concrete in columns
only.
Beam quantity
For beams, the calculation is same as beam is also rectangular in shape.
In the case of beam, we will consider in to in distance for finding the length of the beam.
You can see B1-1 beam is 11.16 feet long and cross sectional dimensions are 9 x 18 inch means 0.75 x
1.5.
After finding all the length we need a final quantity of concrete used in the all beams.
I have provided Ground beam and first floor beam with same dimensions for ease of calculations.
So, for all beams we have quantity of concrete is 222.31 x 2 = 444.62 cum. ft.
Slab quantity
For slabs, the calculation is same but the area will be varies for each slab, you can find the
dimensions in the plan and calculation in above image.
Footing quantity
I have provided the same footing for all the columns for ease of understanding. You can find a
calculation in above image.
Sometimes coping is provided below the window for screwing purpose or some other purpose.
In our case we will consider lump sump of 12 cum. ft. concrete in coping.
PCC means plain cement concrete. We don't use reinforcement in PCC. PCC can not beam tensile
load, as steel rebar is not used on it.
In footing bed we use PCC, Thickness of PCC is 4 Inch and 6 inch bigger than footing in all the
directions.
We have 12 footings So total PCC will be 12 x 6.25 = 75 cum. ft. which is 2.16 cum. m.
In ground/plinth slab we also use PCC. So, we get total 4.95 cum. m. of M15 grade PCC slab at the
plinth level.
For calculating steel in the structural members, we use thumb rule for now.
As we know the density of steel is 7850 kg/m3. which means in 1 m3 of steel weight is 7850 kg.
We will consider 5000 kg steel (wastage, additional work) for this house.
In M20 (1:1.5:3) grade concrete, 8.22 bags cement, 616.5 kg sand and 1233 kg aggregate is used.
In M15 (1:2:4) grade concrete, 6.34 bags cement, 634 kg sand and 1268 kg aggregate is used.
Now, we have material cost of RCC structure from rates and quantity of various items.
Material rates varies from place to place and time to time, currently I am using the rates of Gujarat
region.
For 1 ton of steel we will take 10 kg of binding wire and 10 kg nail as per past experience.
We don't consider the shattering material cost because it will be in the scope of the contractor.
Total - - 5,55,190 ₹
Conclusion
From the above calculations and discussion we can say that construction cost material of RCC of
supposed house is 5,55,190 INR.
We have 22' x 40' feet which is 880 square feet house. So, construction cost per square feet will be
555190/880 = 630.9 INR.
We have two slabs in this plan (G+1) , In some region people provide the rates according to slabs.
So, in our case the construction cost per square feet is 316 INR.
After quantity calculations and material rate calculation we will discuss about the labor rates for RCC
construction in the next article.
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